View Filing Data

$ 284

$ 283

^[1],[2]

$ 502

$ 517

^[1],[2]

^[1],[2]

161

162

^[1],[2]

^[1],[2]

153

149

^[1],[2]

^[1],[2]

^[2]

162

155

^[1],[2]

326

316

^[1],[2]

122

128

^[1],[2]

176

201

^[1],[2]

^[1],[2]

^[1],[2],[3]

^[1],[2]

(82)

(65)

^[1],[2]

(155)

(136)

^[1],[2]

Total other expense, net

(65)

(49)

^[1],[2]

(118)

(116)

^[1],[2]

Less: Net loss attributable to noncontrolling interests

^[1],[2]

^{[1],[2],[3],[4]}

(19)

(15)

^[1],[2]

(28)

(26)

^[1],[2]

^[1],[2]

111

^[1],[2]

Operating Revenues

(1)

^[5]

^[6]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

Total other expense, net

(167)

^[5]

(208)

^[6]

(189)

^[5]

(239)

^[6]

Less: Net loss attributable to noncontrolling interests

(167)

^[5]

(208)

^[6]

(189)

^[5]

(239)

^[6],[7]

^[5]

^[6]

^[5]

^[6]

$ (168)

^[5]

$ (208)

^[6]

$ (191)

^[5]

$ (239)

^[6]

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.

Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

^[3]

Other Comprehensive Loss, net of tax

$ 57

$ 79

^[1],[2]

$ 58

$ 85

^[1],[2],[4]

Unrealized loss on derivatives

(7)

(19)

^[3],[5]

(69)

^[5]

Other comprehensive loss

(7)

(19)

^[3],[5]

(69)

^[5]

Comprehensive Income

^[3],[5]

^[5]

Less: Comprehensive loss attributable to noncontrolling interests

(19)

(23)

^[3],[5]

(28)

(35)

^[5]

Cash Flows from Operating Activities

$ 69

$ 83

^[3],[5]

$ 86

$ 51

^[5]

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[4]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Consolidated Balance Sheets - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 179,000,000	$ 321,000,000
Restricted cash	114,000,000	165,000,000
Accounts receivable — trade	119,000,000	92,000,000
Accounts receivable — affiliate	2,000,000	1,000,000
Inventory	41,000,000	39,000,000
Notes receivable	14,000,000	16,000,000
Derivative instruments — affiliate	1,000,000	2,000,000
Prepayments and other current assets	21,000,000	20,000,000
Total current assets	491,000,000	656,000,000
Property, plant and equipment
Less accumulated depreciation	(1,102,000,000)	(951,000,000)
Property, plant and equipment, net	5,322,000,000	5,460,000,000
Other Assets
Equity investments in affiliates	1,161,000,000	1,152,000,000
Notes receivable	7,000,000	14,000,000
Intangible assets, net	1,251,000,000	1,286,000,000
Derivative instruments	0	1,000,000
Other non-current assets	74,000,000	51,000,000
Total other assets	2,493,000,000	2,504,000,000
Total Assets	8,306,000,000	8,620,000,000
Current Liabilities
Current portion of long-term debt — external	298,000,000	291,000,000
Accounts payable — trade	23,000,000	23,000,000
Accounts payable — affiliate	31,000,000	40,000,000
Derivative instruments	26,000,000	32,000,000
Accrued expenses and other current liabilities	59,000,000	85,000,000
Total current liabilities	437,000,000	471,000,000
Other Liabilities
Long-term debt — external	4,993,000,000	5,098,000,000
Long-term debt — affiliate	618,000,000	618,000,000
Due to Related Parties, Noncurrent	9,000,000	9,000,000
Derivative instruments	54,000,000	44,000,000
Other non-current liabilities	79,000,000	76,000,000
Total non-current liabilities	5,753,000,000	5,845,000,000
Total Liabilities	6,190,000,000	6,316,000,000
Commitments and Contingencies	0	0
Members' Equity
Contributed capital	1,807,000,000	1,995,000,000
Retained earnings	101,000,000	79,000,000
Accumulated other comprehensive loss	(83,000,000)	(83,000,000)
Noncontrolling interest	291,000,000	313,000,000
Total Members' Equity	2,116,000,000	2,304,000,000
Total Liabilities and Members’ Equity	$ 8,306,000,000	$ 8,620,000,000

Consolidated Statements Of Cash Flows - USD ($)
$ in Millions

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

^[4]

Adjustments to reconcile net (loss) income to net cash provided by operating activities:

$ 58

$ 85

^[1],[2],[3]

Distributions from unconsolidated affiliates

^[1],[3]

Amortization of financing costs

153

149

Amortization of intangibles and out-of-market contracts

Changes in derivative instruments

(1)

Loss on disposal of asset components

(4)

(3)

Changes in prepaid and accrued liabilities for tolling agreements

Changes in other working capital

(16)

(3)

Net Cash Provided by Operating Activities

172

219

^[5]

Cash Flows from Investing Activities

131

(13)

(11)

^[5]

Return of investment from unconsolidated affiliates

^[5]

^[5]

(33)

(59)

^[5]

(2)

^[5]

Cash Flows from Financing Activities

(143)

(41)

^[5]

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

(42)

(15)

^[5]

Payments of distributions

(104)

(89)

(4)

^[5]

Proceeds from the issuance of long-term debt — external

^[5]

Net Cash Used in Financing Activities

(142)

(122)

^[5]

(222)

(206)

^[5]

Net Decrease in Cash, Cash Equivalents and Restricted Cash

(193)

(28)

^[5]

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

486

241

^[5]

Cash, Cash Equivalents and Restricted Cash at End of Period

$ 293

$ 213

^[5]

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[3]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

Nature of Business

6 Months Ended

Jun. 30, 2017

Nature of Business Disclosure [Abstract]

Business Description and Basis of Presentation [Text Block]

Nature of Business

NRG Yield LLC, together with its consolidated subsidiaries, or the Company, was formed by NRG as a Delaware limited liability company on March 5, 2013, to serve as the primary vehicle through which NRG owns, operates and acquires contracted renewable and conventional generation and thermal infrastructure assets. NRG owns 100% of NRG Yield LLC's Class B units and Class D units and receives distributions through its ownership of these units. Yield, Inc. owns 100% of NRG Yield LLC's Class A units and Class C units.

The Company owns a diversified portfolio of contracted renewable and conventional generation and thermal infrastructure assets in the U.S. The Company’s contracted generation portfolio collectively represents 4,879 net MW as of June 30, 2017. Each of these assets sells substantially all of its output pursuant to long-term offtake agreements with creditworthy counterparties. The weighted average remaining contract duration of these offtake agreements was approximately 16 years as of June 30, 2017 based on CAFD. The Company also owns thermal infrastructure assets with an aggregate steam and chilled water capacity of 1,319 net MWt and electric generation capacity of 123 net MW. These thermal infrastructure assets provide steam, hot and/or chilled water, and, in some instances, electricity to commercial businesses, universities, hospitals and governmental units in multiple locations, principally through long-term contracts or pursuant to rates regulated by state utility commissions.

The following table represents the structure of the Company as of June 30, 2017:

On July 12, 2017, NRG announced that it had adopted and initiated a three-year, three-part improvement plan, or the NRG Transformation Plan. As part of the NRG Transformation Plan, NRG announced that it is exploring strategic alternatives for its renewables platform and its interest in Yield, Inc. NRG, through its holdings of Class B common stock and Class D common stock, has a 55.1% voting interest in Yield, Inc. and receives distributions from the Company through its ownership of Class B units and Class D units. NRG stated that the strategic alternatives span a variety of ownership structures and partnership types, including the potential partial or full monetization of NRG's renewables platform and NRG's interest in Yield, Inc. NRG is Yield, Inc.'s controlling stockholder and the Company has been highly dependent on NRG for, among other things, growth opportunities and management and administration services. See Part I, Item 1A, Risk Factors in the Company's 2016 Form 10-K as well as Part II, Item 1A, Risk Factors in this report, for risks related to the NRG Transformation Plan and the Company's relationship with NRG.

As of June 30, 2017, the Company's operating assets are comprised of the following projects:



Projects	Percentage Ownership		Net Capacity (MW)^(a)	Offtake Counterparty	Expiration
Conventional
El Segundo	100	%	550	Southern California Edison	2023
GenConn Devon	50	%	95	Connecticut Light & Power	2040
GenConn Middletown	50	%	95	Connecticut Light & Power	2041
Marsh Landing	100	%	720	Pacific Gas and Electric	2023
Walnut Creek	100	%	485	Southern California Edison	2023
			1,945
Utility Scale Solar
Agua Caliente	16	%	46	Pacific Gas and Electric	2039
Alpine	100	%	66	Pacific Gas and Electric	2033
Avenal	50	%	23	Pacific Gas and Electric	2031
Avra Valley	100	%	26	Tucson Electric Power	2032
Blythe	100	%	21	Southern California Edison	2029
Borrego	100	%	26	San Diego Gas and Electric	2038
CVSR	100	%	250	Pacific Gas and Electric	2038
Desert Sunlight 250	25	%	63	Southern California Edison	2035
Desert Sunlight 300	25	%	75	Pacific Gas and Electric	2040
Kansas South	100	%	20	Pacific Gas and Electric	2033
Roadrunner	100	%	20	El Paso Electric	2031
TA High Desert	100	%	20	Southern California Edison	2033
Utah Solar Portfolio^(e)	50	%	265	PacifiCorp	2036
			921
Distributed Solar
Apple I LLC Projects	100	%	9	Various	2032
AZ DG Solar Projects	100	%	5	Various	2025 - 2033
			14
Wind
Alta I	100	%	150	Southern California Edison	2035
Alta II	100	%	150	Southern California Edison	2035
Alta III	100	%	150	Southern California Edison	2035
Alta IV	100	%	102	Southern California Edison	2035
Alta V	100	%	168	Southern California Edison	2035
Alta X^(b)	100	%	137	Southern California Edison	2038
Alta XI ^(b)	100	%	90	Southern California Edison	2038
Buffalo Bear	100	%	19	Western Farmers Electric Co-operative	2033
Crosswinds ^{(b) (f)}	74.3	%	16	Corn Belt Power Cooperative	2027
Elbow Creek ^{(b) (f)}	75	%	92	NRG Power Marketing LLC	2022
Elkhorn Ridge ^{(b) (f)}	50.3	%	41	Nebraska Public Power District	2029
Forward ^{(b) (f)}	75	%	22	Constellation NewEnergy, Inc.	2017
Goat Wind ^{(b) (f)}	74.9	%	113	Dow Pipeline Company	2025
Hardin ^{(b) (f)}	74.3	%	11	Interstate Power and Light Company	2027
Laredo Ridge	100	%	80	Nebraska Public Power District	2031
Lookout ^{(b) (f)}	75	%	29	Southern Maryland Electric Cooperative	2030



Projects	Percentage Ownership		Net Capacity (MW)^(a)	Offtake Counterparty	Expiration
Odin ^{(b) (f)}	74.9	%	15	Missouri River Energy Services	2028
Pinnacle	100	%	55	Maryland Department of General Services and University System of Maryland	2031
San Juan Mesa ^{(b) (f)}	56.3	%	68	Southwestern Public Service Company	2025
Sleeping Bear ^{(b) (f)}	75	%	71	Public Service Company of Oklahoma	2032
South Trent	100	%	101	AEP Energy Partners	2029
Spanish Fork ^{(b) (f)}	75	%	14	PacifiCorp	2028
Spring Canyon II ^(b)	90.1	%	29	Platte River Power Authority	2039
Spring Canyon III ^(b)	90.1	%	25	Platte River Power Authority	2039
Taloga	100	%	130	Oklahoma Gas & Electric	2031
Wildorado ^{(b) (f)}	74.9	%	121	Southwestern Public Service Company	2027
			1,999
Thermal
NRG Dover Energy Center LLC	100	%	103	NRG Power Marketing LLC	2018
Thermal generation	100	%	20	Various	Various
			123
Total net generation capacity^(c)			5,002

Thermal equivalent MWt ^(d)	100	%	1,319	Various	Various

^(a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of June 30, 2017.

^(b) Projects are part of tax equity arrangements.

^(c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,008 MWs.

^(d) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 134 MWt available under the right-to-use provisions contained in agreements between two of the Company's thermal facilities and certain of its customers.

^(e) Represents interests in Four Brothers Solar, LLC, Granite Mountain Holdings, LLC, and Iron Springs Holdings, LLC, all acquired as part of the March 2017 Drop Down Assets (ownership percentage is based upon cash to be distributed).

^(f) Projects are part of NRG Wind TE Holdco portfolio.

In addition to the facilities owned or leased in the table above, the Company entered into partnerships to own or purchase solar power generation projects, as well as other ancillary related assets from a related party via intermediate funds. The Company does not consolidate these partnerships and accounts for them as equity method investments. The Company's net interest in these projects is 190 MW based on cash to be distributed as of June 30, 2017. For further discussions, refer to Note 5, Investments Accounted for by the Equity Method and Variable Interest Entities to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K.

Substantially all of the Company's generation assets are under long-term contractual arrangements for the output or capacity from these assets. The thermal assets are comprised of district energy systems and combined heat and power plants that produce steam, hot water and/or chilled water and, in some instances, electricity at a central plant. Certain district energy systems are subject to rate regulation by state public utility commissions (although they may negotiate certain rates) while the other district energy systems have rates determined by negotiated bilateral contracts.

As further described in Note 3, Business Acquisitions, on March 27, 2017, the Company acquired the following interests from NRG, referred to as the March 2017 Drop Down Assets: (i) Agua Caliente Borrower 2 LLC, which owns a 16% interest in the Agua Caliente solar farm, one of the ROFO assets and (ii) NRG's interests in seven utility-scale solar farms located in Utah that were part of NRG's November 2, 2016 acquisition of projects from SunEdison, or the Utah Solar Portfolio. The Company paid total cash consideration of $130 million, plus a $1 million working capital adjustment, and assumed non-recourse debt of $328 million, which is consolidated, as well as its pro-rata share of non-recourse project-level debt of $135 million. The acquisition was funded with cash on hand. The acquisition of the March 2017 Drop Down Assets was accounted for as a transfer of entities under common control. The accounting guidance requires retrospective combination of the entities for all periods presented as if the combination had been in effect from the beginning of the financial statement period or from the date the entities were under common control (if later than the beginning of the financial statement period). Accordingly, in connection with the retrospective adjustment of prior periods, the Company adjusted its financial statements to reflect its results of operations, financial position and cash flows as if it recorded its interests in the Agua Caliente Borrower 2 LLC on January 1, 2016, and its interests in the Utah Solar Portfolio on November 2, 2016.

In addition, as described in Note 3, Business Acquisitions, the Company's results of operations for the six months ended June 30, 2016 were recast for the Company's acquisition of the CVSR Drop Down Asset on September 1, 2016.

The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the SEC’s regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. Interim results are not necessarily indicative of results for a full year.

In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of June 30, 2017, and the results of operations, comprehensive income (loss) and cash flows for the three and six months ended June 30, 2017 and 2016.

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Use of Estimates

The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could be different from these estimates.

Accumulated Depreciation, Accumulated Amortization

The following table presents the accumulated depreciation included in the property, plant and equipment, net, and accumulated amortization included in intangible assets, net, respectively, as of June 30, 2017 and December 31, 2016:



	June 30, 2017		December 31, 2016
	(In millions)
Property, Plant and Equipment Accumulated Depreciation	$	1,102	$	951
Intangible Assets Accumulated Amortization	198		163

Noncontrolling Interests

The following table reflects the changes in the Company's noncontrolling interest balance:



	(In millions)
Balance as of December 31, 2016	313
Capital contributions from tax equity investors, net of distributions	13
Comprehensive loss	(28		)
Distributions to NRG for its 25% interest in TE Holdco	(7		)
Balance as of June 30, 2017	$	291

Distributions

The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the six months ended June 30, 2017:



	Second Quarter 2017		First Quarter 2017
Distributions per Class A, B, C and D unit	$	0.27	$	0.26

On July 25, 2017, the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.28 per unit payable on September 15, 2017 to unit holders of record as of September 1, 2017.

Changes in Capital Structure

During the first six months of 2017, Yield, Inc. issued 934,139 shares of Class C common stock under the ATM Program for gross proceeds of $16 million, with commission fees of $163 thousand. Yield, Inc. used the net proceeds to acquire 934,139 Class C units from the Company. At June 30, 2017, approximately $134 million remains available for issuance under the ATM Program.

Reclassifications

Certain prior-year amounts have been reclassified for comparative purposes.

Recent Accounting Developments

ASU 2016-18 — In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash, or ASU No. 2016-18. The amendments of ASU No. 2016-18 require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts on the statement of cash flows. The amendments of ASU No. 2016-18 are effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. Early adoption is permitted and the adoption of ASU No. 2016-18 will be applied retrospectively. The Company early adopted ASU No. 2016-18 during the second quarter of 2017. Net cash flows used in investing activities for the six months ended June 30, 2016 increased by $7 million. The sum of Company's cash and cash equivalents and restricted cash reported within the consolidated balance sheet as of December 31, 2016 equals the beginning balances of cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows for the six months ended June 30, 2017. The sum of Company's cash and cash equivalents and restricted cash reported within the consolidated balance sheet as of June 30, 2017 equals to the ending balances of cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows for the six months ended June 30, 2017.

ASU 2016-02 — In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), or Topic 842, with the objective to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and to improve financial reporting by expanding the related disclosures. The guidance in Topic 842 provides that a lessee that may have previously accounted for a lease as an operating lease under current GAAP should recognize the assets and liabilities that arise from a lease on the balance sheet. In addition, Topic 842 expands the required quantitative and qualitative disclosures with regards to lease arrangements. The Company expects to adopt the standard effective January 1, 2019 utilizing the required modified retrospective approach for the earliest period presented. The Company expects to elect certain of the practical expedients permitted, including the expedient that permits the Company to retain its existing lease assessment and classification. The Company is currently working through an adoption plan and evaluating the anticipated impact on the Company's results of operations, cash flows and financial position. While the Company is currently evaluating the impact the new guidance will have on its financial position and results of operations, the Company expects to recognize lease liabilities and right of use assets. The extent of the increase to assets and liabilities associated with these amounts remains to be determined pending the Company’s review of its existing lease contracts and service contracts which may contain embedded leases. While this review is still in process, the Company believes the adoption of Topic 842 may be material to its financial statements.

ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU No. 2014-09, which was further amended through various updates issued by the FASB thereafter. The amendments of ASU No. 2014-09 completed the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. The guidance under Topic 606 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes a five step model to be applied by an entity in evaluating its contracts with customers. The Company expects to adopt the standard effective January 1, 2018 and apply the guidance retrospectively to contracts at the date of adoption. The Company will recognize the cumulative effect of applying Topic 606 at the date of initial application, as prescribed under the modified retrospective transition method. The Company also expects to elect the practical expedient available under Topic 606 for measuring progress toward complete satisfaction of a performance obligation and for disclosure requirements of remaining performance obligations. The practical expedient allows an entity to recognize revenue in the amount to which the entity has the right to invoice such that the entity has a right to the consideration in an amount that corresponds directly with the value to the customer for performance completed to date by the entity. The majority of the Company's revenues are obtained through PPAs, which are currently accounted for as operating leases. In connection with the implementation of Topic 842, as described above, the Company expects to elect certain of the practical expedients permitted, including the expedient that permits the Company to retain its existing lease assessment and classification. As leases are excluded from the scope of Topic 606, the Company expects the standard to have an immaterial impact on the Company's results of operations, cash flows and financial position; however, the Company continues to assess the impact in connection with its plan of adoption.

Business Acquisitions Business Acquisitions (Notes)

6 Months Ended

Jun. 30, 2017

Business Acquisitions [Abstract]

Business Acquisition, Pro Forma Information [Table Text Block]

Business Acquisitions

2017 Acquisitions

August 2017 Drop Down Assets — On August 1, 2017, the Company acquired the remaining 25% interest in NRG Wind TE Holdco, a portfolio of 12 wind projects, from NRG for total cash consideration of $41.5 million, excluding working capital adjustments. The transaction also includes potential additional payments to NRG dependent upon actual energy prices for merchant periods beginning in 2027.

March 2017 Drop Down Assets — On March 27, 2017, the Company acquired the following interests from NRG: (i) Agua Caliente Borrower 2 LLC, which owns a 16% interest (approximately 31% of NRG's 51% interest) in the Agua Caliente solar farm, one of the ROFO Assets, representing ownership of approximately 46 net MW of capacity and (ii) NRG's interests in the Utah Solar Portfolio. Agua Caliente is located in Yuma County, AZ and sells power subject to a 25-year PPA with Pacific Gas and Electric, with 22 years remaining on that contract. The seven utility-scale solar farms in the Utah Solar Portfolio are owned by the following entities: Four Brothers Capital, LLC, Iron Springs Capital, LLC, and Granite Mountain Capital, LLC. These utility-scale solar farms achieved commercial operations in 2016, sell power subject to 20-year PPAs with PacifiCorp, a subsidiary of Berkshire Hathaway and are part of a tax equity structure with Dominion Solar Projects III, Inc., or Dominion, through which the Company is entitled to receive 50% of cash to be distributed, as further described below. The Company paid cash consideration of $130 million, plus $1 million of working capital. The acquisition of the March 2017 Drop Down Assets was funded with cash on hand. The Company recorded the acquired interests as equity method investments. The Company also assumed non-recourse debt of $41 million and $287 million on Agua Caliente Borrower 2 LLC and the Utah Solar Portfolio, respectively, as further described in Note 7, Long-term Debt, as well as its pro-rata share of non-recourse project-level debt of Agua Caliente Solar LLC, as further described in Note 4, Investments Accounted for by the Equity Method and Variable Interest Entities.

The following is a summary of assets and liabilities transferred in connection with the acquisition of the March 2017 Drop Down Assets as of March 27, 2017:



	(In millions)
Assets:
Cash	$	6
Equity investment in projects	456
Total assets acquired	462
Liabilities:
Debt (Current and non-current) ^(a)	320
Other current and non-current liabilities	3
Total liabilities assumed	323
Net assets acquired	$	139

^(a) Net of $8 million of debt issuance costs.

2016 Acquisitions

CVSR Drop Down — Prior to September 1, 2016, the Company had a 48.95% interest in CVSR, which was accounted for as an equity method investment. On September 1, 2016, the Company acquired from NRG the remaining 51.05% interest of CVSR Holdco LLC, which indirectly owns the CVSR solar facility, for total cash consideration of $78.5 million plus an immaterial working capital adjustment. The Company also assumed additional debt of $496 million, which represents 51.05% of the CVSR project level debt and 51.05% of the notes issued under the CVSR Holdco Financing Agreement, as of the closing date, as further described in Note 10, Long-term Debt, to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. The acquisition was funded with cash on hand.

The assets and liabilities transferred to the Company relate to interests under common control by NRG and were recorded at historical cost in accordance with ASC 805-50, Business Combinations - Related Issues. The difference between the cash paid and historical value of the CVSR Drop Down of $112 million, as well as $6 million of AOCL, was recorded as a distribution to NRG with the offset to contributed capital. Because the transaction constituted a transfer of net assets under common control, the guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect since the inception of common control. In connection with the retrospective adjustment of prior periods, the Company now consolidates CVSR and 100% of its debt, consisting of $771 million of project level debt and $200 million of notes issued under the CVSR Holdco Financing Agreement as of September 1, 2016. In connection with the retrospective adjustment of prior periods, the Company has removed the equity method investment from all prior periods and adjusted its financial statements to reflect its results of operations, financial position and cash flows as if it had consolidated CVSR from the beginning of the financial statement period.

The following tables present the Company's historical information summary combining the financial information for the CVSR and March 2017 Drop Down Assets transferred in connection with the acquisition:



	Three months ended June 30, 2016								Six months ended June 30, 2016
	As Previously Reported		March 2017 Drop Down Assets		CVSR Drop Down		As Currently Reported		As Previously Reported		March 2017 Drop Down Assets		CVSR Drop Down		As Currently Reported
(In millions)
Total operating revenues	$	258	$	—	$	25	$	283	$	478	$	—	$	39	$	517
Operating income	113		—		15		128		182		—		19		201
Net income	74		1		4		79		79		2		4		85

Variable Interest Entities

6 Months Ended

Jun. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Investments Accounted for by the Equity Method and Variable Interest Entities

Entities that are Consolidated

The Company has a controlling financial interest in certain entities which have been identified as VIEs under ASC 810, Consolidations, or ASC 810. These arrangements are primarily related to tax equity arrangements entered into with third parties in order to monetize certain tax credits associated with wind facilities, as further described in Note 5, Investments Accounted for by the Equity Method and Variable Interest Entities, to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K.

Summarized financial information for the Company's consolidated VIEs consisted of the following as of June 30, 2017:



(In millions)	NRG Wind TE Holdco		Alta Wind TE Holdco		Spring Canyon
Other current and non-current assets	$	184	$	22	$	3
Property, plant and equipment	428		449		98
Intangible assets	2		268		—
Total assets	614		739		101
Current and non-current liabilities	203		8		6
Total liabilities	203		8		6
Noncontrolling interest	125		102		64
Net assets less noncontrolling interests	$	286	$	629	$	31

Entities that are not Consolidated

The Company has interests in entities that are considered VIEs under ASC 810, but for which it is not considered the primary beneficiary. The Company accounts for its interests in these entities under the equity method of accounting, as further described in Note 5, Investments Accounted for by the Equity Method and Variable Interest Entities, to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K.

The Company's maximum exposure to loss as of June 30, 2017 is limited to its equity investment in the unconsolidated entities, as further summarized in the table below:



(In millions)	Maximum exposure to loss
Four Brothers Solar, LLC	$	226
Granite Mountain Holdings, LLC	82
Iron Springs Holdings, LLC	57
GenConn Energy LLC	104
NRG DGPV Holdco 1 LLC	73
NRG RPV Holdco 1 LLC	67
NRG DGPV Holdco 2 LLC	44

Utah Solar Portfolio — As described in Note 3, Business Acquisitions, on March 27, 2017, as part of the March 2017 Drop Down Assets acquisition, the Company acquired from NRG 100% of the Class A equity interests in the Utah Solar Portfolio, comprised of Four Brothers Solar, LLC, Granite Mountain Holdings, LLC, and Iron Springs Holdings, LLC. The Class B interests of the Utah Solar Portfolio are owned by a tax equity investor, or TE Investor, who receives 99% of allocations of taxable income and other items until the flip point, which occurs when the TE Investor obtains a specified return on its initial investment, at which time the allocations to the TE Investor change to 50%. The Company generally receives 50% of distributable cash throughout the term of the tax-equity arrangements. The three entities comprising the Utah Solar Portfolio are VIEs. As the Company is not the primary beneficiary, the Company uses the equity method of accounting to account for its interests in the Utah Solar Portfolio. The Company utilizes the HLBV method to determine its share of the income or losses in the investees.

The following tables present summarized financial information for the Company's significant equity method investments:



	Three months ended June 30,				Six months ended June 30,
(In millions)	2017		2016		2017		2016
Income Statement Data:
Utah Solar Portfolio
Operating revenues	$	24	$	—	$	37	$	—
Operating income	10		—		8		—
Net income	10		—		8		—
					June 30, 2017		December 31, 2016
Balance Sheet Data:					(In millions)
Utah Solar Portfolio
Current assets					$	29	$	20
Non-current assets					1,101		1,105
Current liabilities					9		14
Non-current liabilities					26		38

NRG DGPV Holdco 2 LLC — On February 29, 2016, the Company and NRG entered into an additional partnership by forming NRG DGPV Holdco 2 LLC, or DGPV Holdco 2, to purchase solar power generation projects as well as other ancillary related assets from NRG Renew LLC or its subsidiaries. The Company contributed $26 million into the partnership during the six months ended June 30, 2017, of which $9 million remained due to NRG in accounts payable — affiliate as of June 30, 2017.

Non-recourse project-level debt of unconsolidated affiliates

Agua Caliente Financing — As described above, the Company acquired a 16% interest in the Agua Caliente solar facility through its acquisition of Agua Caliente Borrower 2 LLC. As of June 30, 2017, Agua Caliente Solar LLC, the direct owner of the Agua Caliente solar facility, had $843 million outstanding under the Agua Caliente financing agreement with the Federal Financing Bank, or FFB, borrowed to finance the costs of constructing the facility. The Company's pro-rata share of the Agua Caliente financing arrangement was $135 million as of June 30, 2017. Amounts borrowed under the Agua Caliente financing agreement accrue interest at a fixed rate based on U.S. Treasury rates plus a spread of 0.375%, mature in 2037 and are secured by the assets of Agua Caliente Solar LLC. The loans provided by the FFB are guaranteed by the U.S. DOE.

Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Fair Value Accounting under ASC 820

ASC 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three levels as follows:


•	Level 1—quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access as of the measurement date.


•	Level 2—inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.


•	Level 3—unobservable inputs for the asset or liability only used when there is little, if any, market activity for the asset or liability at the measurement date.

In accordance with ASC 820, the Company determines the level in the fair value hierarchy within which each fair value measurement in its entirety falls, based on the lowest level input that is significant to the fair value measurement.

For cash and cash equivalents, restricted cash, accounts receivable, accounts receivable — affiliate, accounts payable, current portion of the accounts payable — affiliates, accrued expenses and other liabilities, the carrying amounts approximate fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy.

The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows:



	As of June 30, 2017				As of December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
(In millions)
Assets:
Notes receivable, including current portion	$	21	$	21	$	30	$	30
Liabilities:
Long-term debt — affiliate	618		625		618		608
Long-term debt — external, including current portion	$	5,350	$	5,377	$	5,451	$	5,435

The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non-publicly traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of June 30, 2017 and December 31, 2016:



	As of June 30, 2017				As of December 31, 2016
	Level 2		Level 3		Level 2		Level 3
	(In millions)
Long-term debt, including current portion	$	877	$	5,125	$	833	$	5,210

Recurring Fair Value Measurements

The Company records its derivative assets and liabilities at fair value on its consolidated balance sheet. The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:



	As of June 30, 2017		As of December 31, 2016
	Fair Value ^(a)		Fair Value ^(a)		Fair Value ^(a)
(In millions)	Level 2		Level 1		Level 2
Derivative assets:
Commodity contracts	$	1	$	1	$	1
Interest rate contracts	—		—		1
Total assets	1		1		2
Derivative liabilities:
Commodity contracts	2		—		1
Interest rate contracts	78		—		75
Total liabilities	$	80	$	—	$	76

^(a) There were no derivative assets or liabilities classified as Level 1 as of June 30, 2017. There were no derivative assets or liabilities classified as Level 3 as of June 30, 2017 and December 31, 2016.

Derivative Fair Value Measurements

The Company's contracts are non-exchange-traded and valued using prices provided by external sources. For the Company’s energy markets, management receives quotes from multiple sources. To the extent that multiple quotes are received, the prices reflect the average of the bid-ask mid-point prices obtained from all sources believed to provide the most liquid market for the commodity.

The fair value of each contract is discounted using a risk free interest rate. In addition, a credit reserve is applied to reflect credit risk, which is, for interest rate swaps, calculated based on credit default swaps using the bilateral method. For commodities, to the extent that the net exposure under a specific master agreement is an asset, the Company uses the counterparty’s default swap rate. If the net exposure under a specific master agreement is a liability, the Company uses NRG's default swap rate. For interest rate swaps and commodities, the credit reserve is added to the discounted fair value to reflect the exit price that a market participant would be willing to receive to assume the liabilities or that a market participant would be willing to pay for the assets. As of June 30, 2017, the credit reserve resulted in a $1 million increase in fair value in interest expense. It is possible that future market prices could vary from those used in recording assets and liabilities and such variations could be material.

Concentration of Credit Risk

In addition to the credit risk discussion in Note 2, Summary of Significant Accounting Policies, to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K, the following is a discussion of the concentration of credit risk for the Company's financial instruments. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. The Company monitors and manages credit risk through credit policies that include: (i) an established credit approval process; (ii) daily monitoring of counterparties' credit limits; (iii) the use of credit mitigation measures such as margin, collateral, prepayment arrangements, or volumetric limits; (iv) the use of payment netting agreements; and (v) the use of master netting agreements that allow for the netting of positive and negative exposures of various contracts associated with a single counterparty. Risks surrounding counterparty performance and credit could ultimately impact the amount and timing of expected cash flows. The Company seeks to mitigate counterparty risk by having a diversified portfolio of counterparties.

Counterparty credit exposure includes credit risk exposure under certain long-term agreements, including solar and other PPAs. As external sources or observable market quotes are not available to estimate such exposure, the Company estimates the exposure related to these contracts based on various techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. Based on these valuation techniques, as of June 30, 2017, credit risk exposure to these counterparties attributable to the Company's ownership interests was approximately $2.9 billion for the next five years. The majority of these power contracts are with utilities with strong credit quality and public utility commission or other regulatory support. However, such regulated utility counterparties can be impacted by changes in government regulations, which the Company is unable to predict.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Accounting for Derivative Instruments and Hedging Activities (Notes)

6 Months Ended

Jun. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Accounting for Derivative Instruments and Hedging Activities

This footnote should be read in conjunction with the complete description under Note 7, Accounting for Derivative Instruments and Hedging Activities, to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K.

Energy-Related Commodities

As of June 30, 2017, the Company had energy-related derivative instruments extending through 2020. At June 30, 2017, these contracts were not designated as cash flow or fair value hedges.

Interest Rate Swaps

As of June 30, 2017, the Company had interest rate derivative instruments on non-recourse debt extending through 2036, most of which are designated as cash flow hedges.

Volumetric Underlying Derivative Transactions

The following table summarizes the net notional volume buy of the Company's open derivative transactions broken out by commodity:



		Total Volume
		June 30, 2017		December 31, 2016
Commodity	Units	(In millions)
Natural Gas	MMBtu	2		3
Interest	Dollars	$	2,045	$	2,070

Fair Value of Derivative Instruments

The following table summarizes the fair value within the derivative instrument valuation on the balance sheet:



	Fair Value
	Derivative Assets				Derivative Liabilities
	June 30, 2017		December 31, 2016		June 30, 2017		December 31, 2016
	(In millions)
Derivatives Designated as Cash Flow Hedges:
Interest rate contracts current	$	—	$	—	$	8	$	26
Interest rate contracts long-term	—		1		16		39
Total Derivatives Designated as Cash Flow Hedges	—		1		24		65
Derivatives Not Designated as Cash Flow Hedges:
Interest rate contracts current	—		—		17		5
Interest rate contracts long-term	—		—		37		5
Commodity contracts current	1		2		1		1
Commodity contracts long-term	—		—		1		—
Total Derivatives Not Designated as Cash Flow Hedges	1		2		56		11
Total Derivatives	$	1	$	3	$	80	$	76

The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. As of June 30, 2017 and December 31, 2016, there was no outstanding collateral paid or received. The following tables summarize the offsetting of derivatives by the counterparty master agreement level as of June 30, 2017 and December 31, 2016:



As of June 30, 2017	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
Commodity contracts:	(In millions)
Derivative assets	$	1		$	(1	)	$	—
Derivative liabilities	(2		)	1			(1		)
Total commodity contracts	(1		)	—			(1		)
Interest rate contracts:
Derivative liabilities	(78		)	—			(78		)
Total interest rate contracts	(78		)	—			(78		)
Total derivative instruments	$	(79	)	$	—		$	(79	)



As of December 31, 2016	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
Commodity contracts:	(In millions)
Derivative assets	$	2		$	—		$	2
Derivative liabilities	(1		)	—			(1		)
Total commodity contracts	1			—			1
Interest rate contracts:
Derivative assets	1			(1		)	—
Derivative liabilities	(75		)	1			(74		)
Total interest rate contracts	(74		)	—			(74		)
Total derivative instruments	$	(73	)	$	—		$	(73	)

Accumulated Other Comprehensive Loss

The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives:



	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
	(In millions)
Accumulated OCL beginning balance	$	(79	)	$	(149	)	$	(86	)	$	(99	)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	3			3			8			7
Mark-to-market of cash flow hedge accounting contracts	(10		)	(22		)	(8		)	(76		)
Accumulated OCL ending balance	(86		)	(168		)	(86		)	(168		)
Accumulated OCL attributable to noncontrolling interests	(3		)	(12		)	(3		)	(12		)
Accumulated OCL attributable to NRG Yield LLC	$	(83	)	$	(156	)	$	(83	)	$	(156	)
Losses expected to be realized from OCL during the next 12 months	$	18					$	18

Amounts reclassified from accumulated OCL into income and amounts recognized in income from the ineffective portion of cash flow hedges are recorded to interest expense. There was no ineffectiveness for the six months ended June 30, 2017 and 2016.

Accounting guidelines require a high degree of correlation between the derivative and the hedged item throughout the period in order to qualify as a cash flow hedge. As of December 31, 2016, the Company's regression analysis for Viento Funding II interest rate swaps, while positively correlated, did not meet the required threshold for cash flow hedge accounting. As a result, the Company de-designated the Viento Funding II cash flow hedges as of December 31, 2016, and will prospectively mark these derivatives to market through the income statement.

The Company's regression analysis for Marsh Landing, Walnut Creek and Avra Valley interest rate swaps, while positively correlated, no longer contain matching terms for cash flow hedge accounting. As a result, the Company voluntarily de-designated the Marsh Landing, Walnut Creek and Avra Valley cash flow hedges as of April 28, 2017, and will prospectively mark these derivatives to market through the income statement.

Impact of Derivative Instruments on the Statements of Income

The Company has interest rate derivative instruments that are not designated as cash flow hedges. The effect of interest rate hedges is recorded to interest expense. For the three months ended June 30, 2017 and 2016, the impact to the consolidated statements of income was a loss of $11 million and $2 million, respectively. For the six months ended June 30, 2017 and 2016, the impact to the consolidated statements of income was a loss of $9 million in each period.

A portion of the Company’s derivative commodity contracts relates to its Thermal Business for the purchase of fuel commodities based on the forecasted usage of the thermal district energy centers. Realized gains and losses on these contracts are reflected in the fuel costs that are permitted to be billed to customers through the related customer contracts or tariffs and, accordingly, no gains or losses are reflected in the consolidated statements of income for these contracts.

See Note 5, Fair Value of Financial Instruments, for a discussion regarding concentration of credit risk.

Long-term Debt

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Related Party Transactions Disclosure

This footnote should be read in conjunction with the complete description under Note 10, Long-term Debt, to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. Long-term debt consisted of the following:



	June 30, 2017			December 31, 2016			June 30, 2017, interest rate % ^(a)	Letters of Credit Outstanding at June 30, 2017
	(In millions, except rates)
Long-term debt - affiliate, due 2019	$	337		$	337		3.580
Long-term debt - affiliate, due 2020	281			281			3.325
2024 Senior Notes	500			500			5.375
2026 Senior Notes	350			350			5.000
Project-level debt:
Agua Caliente Borrower 2, due 2038	41			—			5.430	17
Alpine, due 2022	142			145			L+1.750	37
Alta Wind I, lease financing arrangement, due 2034	234			242			7.015	16
Alta Wind II, lease financing arrangement, due 2034	186			191			5.696	23
Alta Wind III, lease financing arrangement, due 2034	193			198			6.067	23
Alta Wind IV, lease financing arrangement, due 2034	125			128			5.938	16
Alta Wind V, lease financing arrangement, due 2035	201			206			6.071	26
Alta Realty Investments, due 2031	31			31			7.000	—
Alta Wind Asset Management, due 2031	18			18			L+2.500	—
Avra Valley, due 2031	55			57			L+1.750	3
Blythe, due 2028	19			19			L+1.625	2
Borrego, due 2025 and 2038	68			69			L+ 2.750/5.650	5
CVSR, due 2037	757			771			2.339 - 3.775	—
CVSR Holdco Notes, due 2037	193			199			4.680	13
El Segundo Energy Center, due 2023	414			443			L+1.625 - L+2.250	82
Energy Center Minneapolis, due 2017 and 2025	85			96			5.950 -7.250	—
Energy Center Minneapolis Series D Notes, due 2031	125			125			3.550	—
Kansas South, due 2031	29			30			L+2.000	4
Laredo Ridge, due 2028	97			100			L+1.875	10
Marsh Landing, due 2017 and 2023	358			370			L+1.750 - L+1.875	49
Apple I LLC projects and related subsidiaries financing agreement, due 2030	27			27			6.000	—
Roadrunner, due 2031	36			37			L+1.625	5
South Trent Wind, due 2020	55			57			L+1.625	10
TA High Desert, due 2020 and 2032	48			49			L+2.500/5.150	—
Tapestry, due 2021	166			172			L+1.625	20
Utah Solar Portfolio, due 2022	284			287			L+2.625	11
Viento, due 2023	169			178			L+2.750	27
Walnut Creek, due 2023	299			310			L+1.625	60
WCEP Holdings, due 2023	45			46			L+3.000	—
Subtotal project-level debt:	4,500			4,601
Total debt	5,968			6,069
Less current maturities	(298		)	(291		)
Less net debt issuance costs	(59		)	(62		)
Total long-term debt	$	5,611		$	5,716

^(a) As of June 30, 2017, L+ equals 3 month LIBOR plus x%, except for the Utah Solar Portfolio and NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, where L+ equals 1 month LIBOR plus x% and Kansas South, where L+ equals 6 month LIBOR plus x%.

The financing arrangements listed above contain certain covenants, including financial covenants that the Company is required to be in compliance with during the term of the respective arrangement. As of June 30, 2017, the Company was in compliance with all of the required covenants.

The discussion below describes material changes to or additions of long-term debt for the six months ended June 30, 2017.

NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility

As of June 30, 2017, there were no outstanding borrowings under the revolving credit facility and the Company had $68 million of letters of credit outstanding.

Thermal Financing

On March 16, 2017, NRG Energy Center Minneapolis LLC, a subsidiary of NRG Thermal LLC, amended the shelf facility of its existing Thermal financing arrangement to allow for the issuance of an additional $10 million of Series F notes at a 4.60% interest rate, or Series F Notes, increasing the total principal amount of notes available for issuance under the shelf facility to $80 million. The Series F Notes will be secured by substantially all of the assets of NRG Energy Center Minneapolis LLC. NRG Thermal LLC has guaranteed the indebtedness and its guarantee is secured by a pledge of the equity interests in all of NRG Thermal LLC’s subsidiaries.

Financing related to the 2017 March Drop Down Assets

Agua Caliente Borrower 2, due 2038

On February 17, 2017, Agua Caliente Borrower 1 LLC, an indirect subsidiary of NRG, and Agua Caliente Borrower 2 LLC, issued $130 million of senior secured notes under the Agua Caliente Borrower 1 LLC and Agua Caliente Borrower 2 LLC financing agreement, or Agua Caliente Holdco Financing Agreement, that bear interest at 5.43% and mature on December 31, 2038. As described in Note 3, Business Acquisitions, on March 27, 2017, the Company acquired Agua Caliente Borrower 2 LLC from NRG and assumed NRG's portion of senior secured notes under the Agua Caliente Holdco Financing Agreement. Agua Caliente Borrower 2 LLC holds $41 million of the Agua Caliente Holdco debt as of June 30, 2017. The debt is joint and several with respect to Agua Caliente Borrower 1 LLC and Agua Caliente Borrower 2 LLC and is secured by the equity interests of each borrower in the Agua Caliente solar facility.

Utah Solar Portfolio, due 2022

As part of the March 2017 Drop Down Assets acquisition, the Company assumed non-recourse debt of $287 million relating to the Utah Solar Portfolio at an interest rate of LIBOR plus 2.625%. The debt matures on December 16, 2022. The $287 million consisted of $222 million outstanding at the time of NRG's acquisition of the Utah Solar Portfolio on November 2, 2016, and additional borrowings of $65 million, net of debt issuance costs, incurred during 2016. The Company holds $284 million of the Utah Solar Portfolio debt as of June 30, 2017.

Segment Reporting

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Reporting

The Company’s segment structure reflects how management currently operates and allocates resources. The Company's businesses are primarily segregated based on conventional power generation, renewable businesses which consist of solar and wind, and the thermal and chilled water business. The Corporate segment reflects the Company's corporate costs. The Company's chief operating decision maker, its Chief Executive Officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, and CAFD, as well as economic gross margin and net income (loss).



	Three months ended June 30, 2017
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	83		$	161		$	40		$	—		$	284
Cost of operations	15			35			27			—			77
Depreciation and amortization	26			47			5			—			78
General and administrative	—			—			—			6			6
Acquisition-related transaction and integration costs	—			—			—			1			1
Operating income (loss)	42			79			8			(7		)	122
Equity in earnings of unconsolidated affiliates	3			13			—			—			16
Other income, net	—			—			—			1			1
Interest expense	(14		)	(49		)	(2		)	(17		)	(82		)
Net Income (Loss)	$	31		$	43		$	6		$	(23	)	$	57
Total Assets	$	1,948		$	5,855		$	417		$	86		$	8,306



	Three months ended June 30, 2016
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	85		$	159		$	39		$	—		$	283
Cost of operations	16			34			27			—			77
Depreciation and amortization	20			50			5			—			75
General and administrative	—			—			—			3			3
Operating income (loss)	49			75			7			(3		)	128
Equity in earnings of unconsolidated affiliates	4			10			—			—			14
Other income, net	—			2			—			—			2
Interest expense	(12		)	(36		)	(1		)	(16		)	(65		)
Net Income (Loss)	$	41		$	51		$	6		$	(19	)	$	79



	Six months ended June 30, 2017
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	158		$	260		$	84		$	—		$	502
Cost of operations	37			67			57			—			161
Depreciation and amortization	50			93			10			—			153
General and administrative	—			—			—			10			10
Acquisition-related transaction and integration costs	—			—			—			2			2
Operating income (loss)	71			100			17			(12		)	176
Equity in earnings of unconsolidated affiliates	6			29			—			—			35
Other income, net	—			1			—			1			2
Interest expense	(26		)	(89		)	(5		)	(35		)	(155		)
Net Income (Loss)	$	51		$	41		$	12		$	(46	)	$	58
Total Assets	$	1,948		$	5,855		$	417		$	86		$	8,306



	Six months ended June 30, 2016
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	164		$	270		$	83		$	—		$	517
Cost of operations	39			67			56			—			162
Depreciation and amortization	40			99			10			—			149
General and administrative	—			—			—			5			5
Operating income (loss)	85			104			17			(5		)	201
Equity in earnings of unconsolidated affiliates	7			11			—			—			18
Other income, net	—			2			—			—			2
Interest expense	(23		)	(78		)	(3		)	(32		)	(136		)
Net Income (Loss)	$	69		$	39		$	14		$	(37	)	$	85

Related Party Transactions

6 Months Ended

Jun. 30, 2017

Related Party Transactions

In addition to the transactions and relationships described elsewhere in these notes to the consolidated financial statements, NRG and certain subsidiaries of NRG provide services to the Company and its project entities. Amounts due to NRG subsidiaries are recorded as accounts payable - affiliate and amounts due to the Company from NRG or its subsidiaries are recorded as accounts receivable - affiliate in the Company's balance sheet.

Power Purchase Agreements (PPAs) between the Company and NRG Power Marketing

Elbow Creek and Dover are parties to PPAs with NRG Power Marketing and generate revenue under the PPAs, which are recorded to operating revenue in the Company's consolidated statements of operations. For the three months and six months ended June 30, 2017, Elbow Creek and Dover, collectively, generated revenue of $3 million and $7 million, respectively. For the three months and six months ended June 30, 2016, Elbow Creek and Dover, collectively, generated revenue of $3 million and $6 million, respectively.

Energy Marketing Services Agreement by and between Thermal entities and NRG Power Marketing

NRG Energy Center Dover LLC, NRG Energy Center Minneapolis, NRG Energy Center Phoenix LLC, and NRG Energy Center Paxton LLC, or Thermal entities, are parties to Energy Marketing Services Agreements with NRG Power Marketing, a wholly-owned subsidiary of NRG. Under the agreements, NRG Power Marketing procures fuel and fuel transportation for the operation of Thermal entities. For the three months and six months ended June 30, 2017, Thermal entities purchased $2 million and $6 million, respectively, of natural gas from NRG Power Marketing. For the three months and six months ended June 30, 2016, Thermal entities purchased $1 million and $5 million, respectively, of natural gas from NRG Power Marketing.

Operation and Maintenance (O&M) Services Agreements by and between Company's subsidiaries and NRG

Certain of the Company's subsidiaries are party to O&M Services Agreements with NRG, pursuant to which NRG subsidiaries provide necessary and appropriate services to operate and maintain the subsidiaries' plant operations, businesses and thermal facilities. NRG is reimbursed for the provided services, as well as for all reasonable and related expenses and expenditures, and payments to third parties for services and materials rendered to or on behalf of the parties to the agreements. NRG is not entitled to any management fee or mark-up under the agreements. The following table summarizes material O&M costs recorded in the cost of operations line in the Company's consolidated statements of operations:



	Three months ended June 30,				Six months ended June 30,
	2017		2016		2017		2016
Thermal entities	$	7	$	8	$	15	$	15
Conventional entities	2		2		4		4
Total	$	9	$	10	$	19	$	19

There were balances of $20 million and $22 million due from the entities above to NRG in accounts payable — affiliate as of June 30, 2017 and December 31, 2016, respectively. As of June 30, 2017, $9 million was recorded in long term liabilities of the consolidated balance sheet.

O&M Services Agreements by and between GenConn and NRG

GenConn incurs fees under two O&M agreements with wholly-owned subsidiaries of NRG. For the three months and six months ended June 30, 2017 and June 30, 2016, the aggregate fees incurred under the agreements were $2 million and $3 million for each period in each year, respectively.

Administrative Services Agreement by and between Marsh Landing and NRG West Coast LLC

On December 19, 2016, Marsh Landing entered into an administrative services agreement with NRG West Coast LLC, a wholly owned subsidiary of NRG. The administrative services agreement was previously between Marsh Landing and GenOn Energy Services, LLC, a wholly-owned subsidiary of NRG and was subsequently assigned to and assumed by NRG West Coast LLC. The Company reimbursed costs under this agreement of $3 million and $6 million for the three and six months ended June 30, 2017, respectively. The Company reimbursed costs under the agreement of $3 million and $5 million for the three and six months ended June 30, 2016, respectively.

Administrative Services Agreements by and between the Company and NRG Renew Operation & Maintenance LLC

Various wholly-owned subsidiaries of the Company in the Renewables segment are party to administrative services agreements with NRG Renew Operation and Maintenance LLC, or RENOM, a wholly-owned subsidiary of NRG, which provides O&M services on behalf of these entities. The Company incurred total expenses for these services in the amount of $7 million and $10 million for the three and six months ended June 30, 2017, respectively. The Company incurred total expenses for these services of $3 million and $5 million for the three and six months ended June 30, 2016, respectively. There was a balance of $3 million and $5 million due to RENOM as of June 30, 2017 and December 31, 2016, respectively.

Management Services Agreement by and between the Company and NRG

NRG provides the Company with various operation, management, and administrative services, which include human resources, accounting, tax, legal, information systems, treasury, and risk management, as set forth in the Management Services Agreement. As of June 30, 2017, the base management fee was approximately $8 million per year, subject to an inflation-based adjustment annually at an inflation factor based on the year-over-year U.S. consumer price index. The fee is also subject to adjustments following the consummation of acquisitions and as a result of a change in the scope of services provided under the Management Services Agreement. Costs incurred under this agreement were $4 million and $6 million for the three and six months ended June 30, 2017, respectively. Costs incurred under this agreement for the three and six months ended June 30, 2016 were $3 million and $5 million, respectively. The costs incurred under the Management Service Agreement included certain direct expenses incurred by NRG on behalf of the Company in addition to the base management fee.

Condensed Consolidating Financial Information Condensed Consolidating Financial Information

6 Months Ended

Jun. 30, 2017

Condensed Consolidating Financial Information Disclosure [Abstract]

Condensed Financial Statements [Text Block]

Condensed Consolidating Financial Information

As of June 30, 2017, Yield Operating LLC had outstanding $500 million of the 2024 Senior Notes and $350 million of the 2026 Senior Notes, collectively Senior Notes, as described in Note 10, Long-term Debt to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. These Senior Notes are guaranteed by NRG Yield LLC, as well as certain of the Company's subsidiaries, or guarantor subsidiaries. These guarantees are both joint and several. The non-guarantor subsidiaries include the rest of the Company's subsidiaries, including those that are subject to project financing.

Unless otherwise noted below, each of the following guarantor subsidiaries fully and unconditionally guaranteed the Senior Notes as of June 30, 2017:

NRG Yield LLC

Alta Wind 1-5 Holding Company, LLC

Alta Wind Company, LLC

NRG Energy Center Omaha Holdings LLC

NRG Energy Center Omaha LLC

NYLD Fuel Cell Holdings LLC

UB Fuel Cell, LLC

NRG South Trent Holdings LLC

NRG Yield DGPV Holding LLC

NRG Yield RPV Holding LLC

Yield Operating LLC conducts its business through and derives its income from its subsidiaries. Therefore, its ability to make required payments with respect to its indebtedness and other obligations depends on the financial results and condition of its subsidiaries and Yield Operating LLC's ability to receive funds from its subsidiaries. There are no restrictions on the ability of any of the guarantor subsidiaries to transfer funds to Yield Operating LLC. However, there may be restrictions for certain non-guarantor subsidiaries.

The following condensed consolidating financial information presents the financial information of NRG Yield LLC, Yield Operating LLC, the issuer of the Senior Notes, the guarantor subsidiaries and the non-guarantor subsidiaries in accordance with Rule 3-10 under the SEC Regulation S-X. The financial information may not necessarily be indicative of results of operations or financial position had the guarantor subsidiaries or non-guarantor subsidiaries operated as independent entities.

In this presentation, NRG Yield LLC consists of parent company operations. Guarantor subsidiaries and non-guarantor subsidiaries of NRG Yield LLC are reported on an equity basis. For companies acquired, the fair values of the assets and liabilities acquired have been presented on a push-down accounting basis. As described in Note 1, Nature of Business, the Company completed the acquisition of the March 2017 Drop Down Assets and CVSR Drop Down Asset from NRG on March 27, 2017 and September 1, 2016, respectively. The guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect since the inception of common control. Accordingly, the Company prepared its condensed consolidating financial statements to reflect the transfers as if they had taken place from the beginning of the financial statements period.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME

For the Three Months Ended June 30, 2017

(Unaudited)



	NRG Yield LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	5	$	279		$	1		$	(1	)	$	284
Operating Costs and Expenses
Cost of operations	—		3		74			1			(1		)	77
Depreciation and amortization	—		1		77			—			—			78
General and administrative	—		—		—			6			—			6
Acquisition-related transaction and integration costs	—		—		—			1			—			1
Total operating costs and expenses	—		4		151			8			(1		)	162
Operating Income (Loss)	—		1		128			(7		)	—			122
Other Income (Expense)
Equity in earnings of consolidated affiliates	75		21		—			71			(167		)	—
Equity in earnings of unconsolidated affiliates	—		—		6			10			—			16
Other income, net	1		—		—			—			—			1
Interest expense	—		—		(64		)	(18		)	—			(82		)
Total other income (expense), net	76		21		(58		)	63			(167		)	(65		)
Net Income	76		22		70			56			(167		)	57
Less: Net loss attributable to noncontrolling interests	—		—		(1		)	(19		)	1			(19		)
Net Income Attributable to NRG Yield LLC	$	76	$	22	$	71		$	75		$	(168	)	$	76

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME

For the Six Months ended June 30, 2017

(Unaudited)



	NRG Yield LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	10	$	492		$	1		$	(1	)	$	502
Operating Costs and Expenses
Cost of operations	—		7		154			1			(1		)	161
Depreciation and amortization	—		2		151			—			—			153
General and administrative	—		—		—			10			—			10
Acquisition-related transaction and integration costs	—		—		—			2			—			2
Total operating costs and expenses	—		9		305			13			(1		)	326
Operating Income (Loss)	—		1		187			(12		)	—			176
Other Income (Expense)
Equity in earnings of consolidated affiliates	85		10		—			94			(189		)	—
Equity in earnings of unconsolidated affiliates	—		2		22			11			—			35
Other income, net	1		—		1			—			—			2
Interest expense	—		—		(119		)	(36		)	—			(155		)
Total other income (expense), net	86		12		(96		)	69			(189		)	(118		)
Net Income	86		13		91			57			(189		)	58
Less: Net loss attributable to noncontrolling interests	—		—		(2		)	(28		)	2			(28		)
Net Income Attributable to NRG Yield LLC	$	86	$	13	$	93		$	85		$	(191	)	$	86

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended June 30, 2017

(Unaudited)



	NRG Yield LLC			Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Net Income	$	76		$	22	$	70		$	56		$	(167	)	$	57
Other Comprehensive Income
Unrealized gain on derivatives	(7		)	—		(6		)	(7		)	13			(7		)
Other comprehensive income	(7		)	—		(6		)	(7		)	13			(7		)
Comprehensive Income	69			22		64			49			(154		)	50
Less: Comprehensive loss attributable to noncontrolling interests	—			—		(1		)	(19		)	1			(19		)
Comprehensive Income Attributable to NRG Yield LLC	$	69		$	22	$	65		$	68		$	(155	)	$	69

^(a) All significant intercompany transactions have been eliminated in consolidation.

For the Six Months ended June 30, 2017

(Unaudited)



	NRG Yield LLC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Net Income	$	86	$	13	$	91		$	57		$	(189	)	$	58
Other Comprehensive Income
Unrealized loss on derivatives	—		—		—			—			—			—
Other comprehensive loss	—		—		—			—			—			—
Comprehensive Income	86		13		91			57			(189		)	58
Less: Comprehensive loss attributable to noncontrolling interests	—		—		(2		)	(28		)	2			(28		)
Comprehensive Income Attributable to NRG Yield LLC	$	86	$	13	$	93		$	85		$	(191	)	$	86

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

June 30, 2017

(Unaudited)



	NRG Yield LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries		NRG Yield Operating LLC (Note Issuer)		Eliminations^(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	82	$	—	$	97	$	—	$	—		$	179
Restricted cash	—		—		114		—		—			114
Accounts receivable — trade	—		3		116		—		—			119
Accounts receivable — affiliate	2		—		—		—		—			2
Inventory	—		1		40		—		—			41
Derivative instruments	—		—		1		—		—			1
Notes receivable	—		—		14		—		—			14
Prepayments and other current assets	—		—		21		—		—			21
Total current assets	84		4		403		—		—			491
Net property, plant and equipment	—		59		5,263		—		—			5,322
Other Assets
Investment in consolidated subsidiaries	1,741		503		—		3,155		(5,399		)	—
Equity investments in affiliates	—		184		607		370		—			1,161
Notes receivable	—		—		7		—		—			7
Intangible assets, net	—		55		1,196		—		—			1,251
Derivative instruments	—		—		—		—		—			—
Other non-current assets	—		—		73		1		—			74
Total other assets	1,741		742		1,883		3,526		(5,399		)	2,493
Total Assets	$	1,825	$	805	$	7,549	$	3,526	$	(5,399	)	$	8,306

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

June 30, 2017

(Continued)



	NRG Yield LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
LIABILITIES AND MEMBERS' EQUITY	(In millions)
Current Liabilities
Current portion of long-term debt — external	$	—		$	—		$	298		$	—		$	—		$	298
Accounts payable	—			1			22			—			—			23
Accounts payable — affiliate	—			6			14			11			—			31
Derivative instruments	—			—			26			—			—			26
Accrued expenses and other current liabilities	—			1			33			25			—			59
Total current liabilities	—			8			393			36			—			437
Other Liabilities
Long-term debt — external	—			—			4,153			840			—			4,993
Long-term debt — affiliate	—			—			—			618			—			618
Accounts payable — affiliate	—			—			9			—			—			9
Derivative instruments	—			—			54			—			—			54
Other non-current liabilities	—			—			79			—			—			79
Total non-current liabilities	—			—			4,295			1,458			—			5,753
Total Liabilities	—			8			4,688			1,494			—			6,190
Commitments and Contingencies
Members' Equity
Contributed capital	1,807			853			2,824			1,980			(5,657		)	1,807
Retained earnings (accumulated deficit)	101			(54		)	63			(156		)	147			101
Accumulated other comprehensive loss	(83		)	(2		)	(87		)	(83		)	172			(83		)
Noncontrolling interest	—			—			61			291			(61		)	291
Total Members' Equity	1,825			797			2,861			2,032			(5,399		)	2,116
Total Liabilities and Members’ Equity	$	1,825		$	805		$	7,549		$	3,526		$	(5,399	)	$	8,306

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Six Months ended June 30, 2017

(Unaudited)



	NRG Yield LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Consolidated
	(In millions)
Net Cash Provided by (Used in) Operating Activities	$	—		$	21		$	152		$	(1	)	$	172
Cash Flows from Investing Activities
Intercompany transactions between Yield LLC and subsidiaries	(40		)	—			—			40			—
Acquisition of Drop Down Assets	—			—			—			(131		)	(131		)
Capital expenditures	—			—			(13		)	—			(13		)
Decrease in notes receivable	—			—			9			—			9
Return of investment from unconsolidated affiliates	—			5			6			14			25
Net investments in unconsolidated affiliates	—			(26		)	(7		)	—			(33		)
Net Cash Used in Investing Activities	(40		)	(21		)	(5		)	(77		)	(143		)
Cash Flows from Financing Activities
Transfer of funds under intercompany cash management arrangement	(6		)	—			—			6			—
Net contributions from noncontrolling interests	—			—			2			13			15
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	—			—			(42		)	—			(42		)
(Payments of) proceeds from distributions	(97		)	—			(66		)	59			(104		)
Payment of debt issuance costs	—			—			(4		)	—			(4		)
Proceeds from Issuance of Class C units	14			—			—			—			14
Proceeds from the issuance of long-term debt — external	—			—			41			—			41
Payments for long-term debt	—			—			(142		)	—			(142		)
Net Cash (Used in) Provided by Financing Activities	(89		)	—			(211		)	78			(222		)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(129		)	—			(64		)	—			(193		)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	211			—			275			—			486
Cash, Cash Equivalents and Restricted Cash at End of Period	$	82		$	—		$	211		$	—		$	293

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended June 30, 2016

(Unaudited)



	NRG Yield LLC^(a)		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries ^(a)			NRG Yield Operating LLC (Note Issuer) ^(a)			Eliminations ^(b)			Consolidated^(a)
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	5	$	278		$	—		$	—		$	283
Operating Costs and Expenses
Cost of operations	—		4		73			—			—			77
Depreciation and amortization	—		1		74			—			—			75
General and administrative	—		—		—			3			—			3
Total operating costs and expenses	—		5		147			3			—			155
Operating Income (Loss)	—		—		131			(3		)	—			128
Other Income (Expense)
Equity in earnings of consolidated affiliates	94		24		—			90			(208		)	—
Equity in earnings of unconsolidated affiliates	—		6		1			7			—			14
Other income, net	—		—		2			—			—			2
Interest expense	—		—		(50		)	(15		)	—			(65		)
Total other income (expense), net	94		30		(47		)	82			(208		)	(49		)
Net Income	94		30		84			79			(208		)	79
Less: Net loss attributable to noncontrolling interests	—		—		—			(15		)	—			(15		)
Net Income Attributable to NRG Yield LLC	$	94	$	30	$	84		$	94		$	(208	)	$	94

^(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

^(b) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME

For the Six Months Ended June 30, 2016

(Unaudited)



	NRG Yield LLC ^(a)		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries ^(a)			NRG Yield Operating LLC (Note Issuer) ^(a)			Eliminations ^(b)			Consolidated^(a)
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	10	$	507		$	—		$	—		$	517
Operating Costs and Expenses
Cost of operations	—		7		155			—			—			162
Depreciation and amortization	—		2		147			—			—			149
General and administrative	—		—		—			5			—			5
Total operating costs and expenses	—		9		302			5			—			316
Operating Income (Loss)	—		1		205			(5		)	—			201
Other Income (Expense)
Equity in income of consolidated affiliates	111		17		—			111			(239		)	—
Equity in earnings of unconsolidated affiliates	—		8		—			10			—			18
Other income, net	—		—		2			—			—			2
Interest expense	—		—		(105		)	(31		)	—			(136		)
Total other income (expense), net	111		25		(103		)	90			(239		)	(116		)
Net Income	111		26		102			85			(239		)	85
Less: Net loss attributable to noncontrolling interests	—		—		—			(26		)	—			(26		)
Net Income Attributable to NRG Yield LLC	$	111	$	26	$	102		$	111		$	(239	)	$	111

^(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

^(b) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2016



	NRG Yield LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries		NRG Yield Operating LLC (Note Issuer)		Eliminations ^(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	211	$	—	$	110	$	—	$	—		$	321
Restricted cash	—		—		165		—		—			165
Accounts receivable — trade	—		2		90		—		—			92
Accounts receivable — affiliate	—		—		1		—		—			1
Inventory	—		2		37		—		—			39
Derivative instruments	—		—		2		—		—			2
Notes receivable	—		—		16		—		—			16
Prepayments and other current assets	—		—		19		1		—			20
Total current assets	211		4		440		1		—			656

Net property, plant and equipment	—		59		5,401		—		—			5,460
Other Assets
Investment in consolidated subsidiaries	1,780		527		—		3,212		(5,519		)	—
Equity investments in affiliates	—		171		600		381		—			1,152
Notes receivable	—		—		14		—		—			14
Intangible assets, net	—		56		1,230		—		—			1,286
Derivative instruments	—		—		1		—		—			1
Other non-current assets	—		—		50		1		—			51
Total other assets	1,780		754		1,895		3,594		(5,519		)	2,504
Total Assets	$	1,991	$	817	$	7,736	$	3,595	$	(5,519	)	$	8,620

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2016

(Continued)



	NRG Yield LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations ^(a)			Consolidated
LIABILITIES AND MEMBERS' EQUITY	(In millions)
Current Liabilities
Current portion of long-term debt — external	$	—		$	—		$	291		$	—		$	—		$	291
Accounts payable	—			2			18			3			—			23
Accounts payable — affiliate	—			7			15			18			—			40
Derivative instruments	—			—			32			—			—			32
Accrued expenses and other current liabilities	—			1			60			24			—			85
Total current liabilities	—			10			416			45			—			471
Other Liabilities
Long-term debt — external	—			—			4,259			839			—			5,098
Long-term debt — affiliate	—			—			—			618			—			618
Accounts payable — affiliate	—			—			9			—			—			9
Derivative instruments	—			—			44			—			—			44
Other non-current liabilities	—			—			76			—			—			76
Total non-current liabilities	—			—			4,388			1,457			—			5,845
Total Liabilities	—			10			4,804			1,502			—			6,316
Commitments and Contingencies
Members' Equity
Contributed capital	1,995			874			2,920			1,971			(5,765		)	1,995
Retained earnings (Accumulated deficit)	79			(65		)	35			(108		)	138			79
Accumulated other comprehensive loss	(83		)	(2		)	(87		)	(83		)	172			(83		)
Noncontrolling Interest	—			—			64			313			(64		)	313
Total Members' Equity	1,991			807			2,932			2,093			(5,519		)	2,304
Total Liabilities and Members’ Equity	$	1,991		$	817		$	7,736		$	3,595		$	(5,519	)	$	8,620

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Six Months Ended June 30, 2016

(Unaudited)



	NRG Yield LLC ^(a)			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries ^(a)			NRG Yield Operating LLC (Note Issuer)			Consolidated ^(a)
	(In millions)
Net Cash Provided by (Used in) Operating Activities	$	—		$	41		$	195		$	(17	)	$	219
Cash Flows from Investing Activities
Intercompany transactions from Yield LLC to subsidiaries	33			—			—			(33		)	—
Capital expenditures	—			—			(11		)	—			(11		)
Decrease in notes receivable	—			—			9			—			9
Return of investment from unconsolidated affiliates	—			1			(11		)	28			18
Net investments in unconsolidated affiliates	—			(44		)	—			(15		)	(59		)
Other	—			—			—			2			2
Net Cash Provided by (Used in) Investing Activities	33			(43		)	(13		)	(18		)	(41		)
Cash Flows from Financing Activities
Transfer of funds under intercompany cash management arrangement	49			2			—			(51		)	—
Net contributions from noncontrolling interests	—			—			—			8			8
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	—			—			(15		)	—			(15		)
(Payments of) proceeds from distributions	(83		)	—			(72		)	66			(89		)
Proceeds from the revolving credit facility	—			—			—			60			60
Payments for the revolving credit facility	—			—			—			(48		)	(48		)
Payments for long-term debt	—			—			(122		)	—			(122		)
Net Cash (Used in) Provided by Financing Activities	(34		)	2			(209		)	35			(206		)
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(1		)	—			(27		)	—			(28		)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	15			—			226			—			241
Cash, Cash Equivalents and Restricted Cash at End of Period	$	14		$	—		$	199		$	—		$	213

^(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

^(b) All significant intercompany transactions have been eliminated in consolidation.

Commitments and Contingencies (Notes)	6 Months Ended
Commitments and Contingencies (Notes)	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Contingencies The Company's material legal proceedings are described below. The Company believes that it has valid defenses to these legal proceedings and intends to defend them vigorously. The Company records reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. In addition, legal costs are expensed as incurred. Management assesses such matters based on current information and makes a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. The Company is unable to predict the outcome of the legal proceedings below or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Company's liabilities and contingencies could be at amounts that are different from its currently recorded reserves and that such difference could be material. In addition to the legal proceedings noted below, the Company and its subsidiaries are party to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect the Company's consolidated financial position, results of operations, or cash flows. Braun v. NRG Yield, Inc. — On April 19, 2016, plaintiffs filed a putative class action lawsuit against NRG Yield, Inc., the current and former members of its board of directors individually, and other parties in California Superior Court in Kern County, CA. Plaintiffs allege various violations of the Securities Act due to the defendants’ alleged failure to disclose material facts related to low wind production prior to NRG Yield, Inc.'s June 22, 2015 Class C common stock offering. Plaintiffs seek compensatory damages, rescission, attorney’s fees and costs. The defendants filed demurrers and a motion challenging jurisdiction on October 18, 2016. On June 16, 2017, the court approved the parties' stipulation which provides the plaintiffs' opposition is due on September 15, 2017 and defendants' reply is due on November 15, 2017. Ahmed v. NRG Energy, Inc. and the NRG Yield Board of Directors — On September 15, 2016, plaintiffs filed a putative class action lawsuit against NRG Energy, Inc., the directors of NRG Yield, Inc., and other parties in the Delaware Chancery Court. The complaint alleges that the defendants breached their respective fiduciary duties with regard to the recapitalization of NRG Yield, Inc. common stock in 2015. The plaintiffs generally seek economic damages, attorney’s fees and injunctive relief. The defendants filed a motion to dismiss the lawsuit on December 21, 2016. Plaintiffs filed their objection to the motion to dismiss on February 15, 2017. The defendants' reply was filed on March 24, 2017. The court heard oral argument on the defendants' motion to dismiss on June 20, 2017. GenOn Noteholders' Lawsuit — On December 13, 2016, certain indenture trustees for an ad hoc group of holders, or the Noteholders, of the GenOn Energy, Inc., or GenOn, 7.875% Senior Notes due 2017, 9.500% Notes due 2018, and 9.875% Notes due 2020, and the GenOn Americas Generation, LLC 8.50% Senior Notes due 2021 and 9.125% Senior Notes due 2031, along with certain of the Noteholders, filed a complaint in the Superior Court of the State of Delaware against NRG and GenOn alleging certain claims related to the Services Agreement between NRG and GenOn. On April 30, 2017, the Noteholders filed an amended complaint that asserts additional claims of fraudulent transfer, insider preference and breach of fiduciary duties. In addition to NRG and GenOn, the amended complaint names NRG Yield LLC and certain current and former officers and directors of GenOn as defendants. The plaintiffs, among other tings, generally seek return of all monies paid under the Services Agreement and any other damages that the court deems appropriate. On April 28, 2017, the bondholders filed an amended complaint adding the GenOn directors and officers as defendants and asserting claims that they breached certain fiduciary duties. Plaintiffs specifically allege that the transfer of Marsh Landing to NRG Yield LLC constituted a fraudulent transfer. On June 12, 2017, certain GenOn entities, NRG and certain holders of the GenOn and GenOn Americas Generation, LLC senior notes entered into a restructuring support and lock-up agreement. Pursuant to the terms of the restructuring support and lock-up agreement, this matter should ultimately be resolved if GenOn's plan of reorganization is approved by the United States Bankruptcy Court for the Southern District of Texas, Houston Division.

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Distributions [Policy Text Block]

Distributions

The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the six months ended June 30, 2017:



	Second Quarter 2017		First Quarter 2017
Distributions per Class A, B, C and D unit	$	0.27	$	0.26

Changes in Capital Structure

Reclassifications

Certain prior-year amounts have been reclassified for comparative purposes.

Use of Estimates

Recent Accounting Developments

Noncontrolling Interest Disclosure [Text Block]

Noncontrolling Interests

The following table reflects the changes in the Company's noncontrolling interest balance:



	(In millions)
Balance as of December 31, 2016	313
Capital contributions from tax equity investors, net of distributions	13
Comprehensive loss	(28		)
Distributions to NRG for its 25% interest in TE Holdco	(7		)
Balance as of June 30, 2017	$	291

Segment Reporting Segment Reporting (Policies)	6 Months Ended
Segment Reporting Segment Reporting (Policies)	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Reporting, Policy [Policy Text Block]	The Company’s segment structure reflects how management currently operates and allocates resources. The Company's businesses are primarily segregated based on conventional power generation, renewable businesses which consist of solar and wind, and the thermal and chilled water business. The Corporate segment reflects the Company's corporate costs. The Company's chief operating decision maker, its Chief Executive Officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, and CAFD, as well as economic gross margin and net income (loss).

Nature of Business Nature of Business (Tables)

6 Months Ended

Jun. 30, 2017

Nature of Business Disclosure [Abstract]

IPO of NRG Yield [Table Text Block]

The following table represents the structure of the Company as of June 30, 2017:

Schedule of Ownership [Table Text Block]

As of June 30, 2017, the Company's operating assets are comprised of the following projects:



Projects	Percentage Ownership		Net Capacity (MW)^(a)	Offtake Counterparty	Expiration
Conventional
El Segundo	100	%	550	Southern California Edison	2023
GenConn Devon	50	%	95	Connecticut Light & Power	2040
GenConn Middletown	50	%	95	Connecticut Light & Power	2041
Marsh Landing	100	%	720	Pacific Gas and Electric	2023
Walnut Creek	100	%	485	Southern California Edison	2023
			1,945
Utility Scale Solar
Agua Caliente	16	%	46	Pacific Gas and Electric	2039
Alpine	100	%	66	Pacific Gas and Electric	2033
Avenal	50	%	23	Pacific Gas and Electric	2031
Avra Valley	100	%	26	Tucson Electric Power	2032
Blythe	100	%	21	Southern California Edison	2029
Borrego	100	%	26	San Diego Gas and Electric	2038
CVSR	100	%	250	Pacific Gas and Electric	2038
Desert Sunlight 250	25	%	63	Southern California Edison	2035
Desert Sunlight 300	25	%	75	Pacific Gas and Electric	2040
Kansas South	100	%	20	Pacific Gas and Electric	2033
Roadrunner	100	%	20	El Paso Electric	2031
TA High Desert	100	%	20	Southern California Edison	2033
Utah Solar Portfolio^(e)	50	%	265	PacifiCorp	2036
			921
Distributed Solar
Apple I LLC Projects	100	%	9	Various	2032
AZ DG Solar Projects	100	%	5	Various	2025 - 2033
			14
Wind
Alta I	100	%	150	Southern California Edison	2035
Alta II	100	%	150	Southern California Edison	2035
Alta III	100	%	150	Southern California Edison	2035
Alta IV	100	%	102	Southern California Edison	2035
Alta V	100	%	168	Southern California Edison	2035
Alta X^(b)	100	%	137	Southern California Edison	2038
Alta XI ^(b)	100	%	90	Southern California Edison	2038
Buffalo Bear	100	%	19	Western Farmers Electric Co-operative	2033
Crosswinds ^{(b) (f)}	74.3	%	16	Corn Belt Power Cooperative	2027
Elbow Creek ^{(b) (f)}	75	%	92	NRG Power Marketing LLC	2022
Elkhorn Ridge ^{(b) (f)}	50.3	%	41	Nebraska Public Power District	2029
Forward ^{(b) (f)}	75	%	22	Constellation NewEnergy, Inc.	2017
Goat Wind ^{(b) (f)}	74.9	%	113	Dow Pipeline Company	2025
Hardin ^{(b) (f)}	74.3	%	11	Interstate Power and Light Company	2027
Laredo Ridge	100	%	80	Nebraska Public Power District	2031
Lookout ^{(b) (f)}	75	%	29	Southern Maryland Electric Cooperative	2030



Projects	Percentage Ownership		Net Capacity (MW)^(a)	Offtake Counterparty	Expiration
Odin ^{(b) (f)}	74.9	%	15	Missouri River Energy Services	2028
Pinnacle	100	%	55	Maryland Department of General Services and University System of Maryland	2031
San Juan Mesa ^{(b) (f)}	56.3	%	68	Southwestern Public Service Company	2025
Sleeping Bear ^{(b) (f)}	75	%	71	Public Service Company of Oklahoma	2032
South Trent	100	%	101	AEP Energy Partners	2029
Spanish Fork ^{(b) (f)}	75	%	14	PacifiCorp	2028
Spring Canyon II ^(b)	90.1	%	29	Platte River Power Authority	2039
Spring Canyon III ^(b)	90.1	%	25	Platte River Power Authority	2039
Taloga	100	%	130	Oklahoma Gas & Electric	2031
Wildorado ^{(b) (f)}	74.9	%	121	Southwestern Public Service Company	2027
			1,999
Thermal
NRG Dover Energy Center LLC	100	%	103	NRG Power Marketing LLC	2018
Thermal generation	100	%	20	Various	Various
			123
Total net generation capacity^(c)			5,002

Thermal equivalent MWt ^(d)	100	%	1,319	Various	Various

^(a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of June 30, 2017.

^(b) Projects are part of tax equity arrangements.

^(f) Projects are part of NRG Wind TE Holdco portfolio.

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Schedule of Accumulated Depreciation and Amortization [Table Text Block]

Accumulated Depreciation, Accumulated Amortization



	June 30, 2017		December 31, 2016
	(In millions)
Property, Plant and Equipment Accumulated Depreciation	$	1,102	$	951
Intangible Assets Accumulated Amortization	198		163

Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block]

Distributions

The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the six months ended June 30, 2017:



	Second Quarter 2017		First Quarter 2017
Distributions per Class A, B, C and D unit	$	0.27	$	0.26

Changes in Capital Structure

Reclassifications

Certain prior-year amounts have been reclassified for comparative purposes.

Schedule of Change in Noncontrolling Interest [Table Text Block]

The following table reflects the changes in the Company's noncontrolling interest balance:



	(In millions)
Balance as of December 31, 2016	313
Capital contributions from tax equity investors, net of distributions	13
Comprehensive loss	(28		)
Distributions to NRG for its 25% interest in TE Holdco	(7		)
Balance as of June 30, 2017	$	291

Business Acquisitions Business Acquisitions (Tables)

6 Months Ended

Jun. 30, 2017

Mergers, Acquisitions and Dispositions Disclosures [Text Block]



	Three months ended June 30, 2016								Six months ended June 30, 2016
	As Previously Reported		March 2017 Drop Down Assets		CVSR Drop Down		As Currently Reported		As Previously Reported		March 2017 Drop Down Assets		CVSR Drop Down		As Currently Reported
(In millions)
Total operating revenues	$	258	$	—	$	25	$	283	$	478	$	—	$	39	$	517
Operating income	113		—		15		128		182		—		19		201
Net income	74		1		4		79		79		2		4		85

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The following is a summary of assets and liabilities transferred in connection with the acquisition of the March 2017 Drop Down Assets as of March 27, 2017:



	(In millions)
Assets:
Cash	$	6
Equity investment in projects	456
Total assets acquired	462
Liabilities:
Debt (Current and non-current) ^(a)	320
Other current and non-current liabilities	3
Total liabilities assumed	323
Net assets acquired	$	139

^(a) Net of $8 million of debt issuance costs.

Variable Interest Entities (Tables)

6 Months Ended

Jun. 30, 2017

Entities that are not consolidated [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of Variable Interest Entities [Table Text Block]

The Company's maximum exposure to loss as of June 30, 2017 is limited to its equity investment in the unconsolidated entities, as further summarized in the table below:



(In millions)	Maximum exposure to loss
Four Brothers Solar, LLC	$	226
Granite Mountain Holdings, LLC	82
Iron Springs Holdings, LLC	57
GenConn Energy LLC	104
NRG DGPV Holdco 1 LLC	73
NRG RPV Holdco 1 LLC	67
NRG DGPV Holdco 2 LLC	44

Consolidated Entities [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of Variable Interest Entities [Table Text Block]

Summarized financial information for the Company's consolidated VIEs consisted of the following as of June 30, 2017:



(In millions)	NRG Wind TE Holdco		Alta Wind TE Holdco		Spring Canyon
Other current and non-current assets	$	184	$	22	$	3
Property, plant and equipment	428		449		98
Intangible assets	2		268		—
Total assets	614		739		101
Current and non-current liabilities	203		8		6
Total liabilities	203		8		6
Noncontrolling interest	125		102		64
Net assets less noncontrolling interests	$	286	$	629	$	31

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives:



	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
	(In millions)
Accumulated OCL beginning balance	$	(79	)	$	(149	)	$	(86	)	$	(99	)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	3			3			8			7
Mark-to-market of cash flow hedge accounting contracts	(10		)	(22		)	(8		)	(76		)
Accumulated OCL ending balance	(86		)	(168		)	(86		)	(168		)
Accumulated OCL attributable to noncontrolling interests	(3		)	(12		)	(3		)	(12		)
Accumulated OCL attributable to NRG Yield LLC	$	(83	)	$	(156	)	$	(83	)	$	(156	)
Losses expected to be realized from OCL during the next 12 months	$	18					$	18

Estimated carrying values and fair values of the Company's recorded financial instruments

The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows:



	As of June 30, 2017				As of December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
(In millions)
Assets:
Notes receivable, including current portion	$	21	$	21	$	30	$	30
Liabilities:
Long-term debt — affiliate	618		625		618		608
Long-term debt — external, including current portion	$	5,350	$	5,377	$	5,451	$	5,435

Fair Value, Option, Quantitative Disclosures [Table Text Block]



	As of June 30, 2017				As of December 31, 2016
	Level 2		Level 3		Level 2		Level 3
	(In millions)
Long-term debt, including current portion	$	877	$	5,125	$	833	$	5,210

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]



	As of June 30, 2017		As of December 31, 2016
	Fair Value ^(a)		Fair Value ^(a)		Fair Value ^(a)
(In millions)	Level 2		Level 1		Level 2
Derivative assets:
Commodity contracts	$	1	$	1	$	1
Interest rate contracts	—		—		1
Total assets	1		1		2
Derivative liabilities:
Commodity contracts	2		—		1
Interest rate contracts	78		—		75
Total liabilities	$	80	$	—	$	76

- Definition

Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.

+ References + Details

Accounting for Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Net notional volume buy/(sell) of NRG Yield's open derivative transactions broken out by commodity

The following table summarizes the net notional volume buy of the Company's open derivative transactions broken out by commodity:



		Total Volume
		June 30, 2017		December 31, 2016
Commodity	Units	(In millions)
Natural Gas	MMBtu	2		3
Interest	Dollars	$	2,045	$	2,070

Fair value within the derivative instrument valuation on the balance sheets

he following table summarizes the fair value within the derivative instrument valuation on the balance sheet:



	Fair Value
	Derivative Assets				Derivative Liabilities
	June 30, 2017		December 31, 2016		June 30, 2017		December 31, 2016
	(In millions)
Derivatives Designated as Cash Flow Hedges:
Interest rate contracts current	$	—	$	—	$	8	$	26
Interest rate contracts long-term	—		1		16		39
Total Derivatives Designated as Cash Flow Hedges	—		1		24		65
Derivatives Not Designated as Cash Flow Hedges:
Interest rate contracts current	—		—		17		5
Interest rate contracts long-term	—		—		37		5
Commodity contracts current	1		2		1		1
Commodity contracts long-term	—		—		1		—
Total Derivatives Not Designated as Cash Flow Hedges	1		2		56		11
Total Derivatives	$	1	$	3	$	80	$	76

Offsetting of derivatives by counterparty master agreement level and collateral received or paid



As of June 30, 2017	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
Commodity contracts:	(In millions)
Derivative assets	$	1		$	(1	)	$	—
Derivative liabilities	(2		)	1			(1		)
Total commodity contracts	(1		)	—			(1		)
Interest rate contracts:
Derivative liabilities	(78		)	—			(78		)
Total interest rate contracts	(78		)	—			(78		)
Total derivative instruments	$	(79	)	$	—		$	(79	)



As of December 31, 2016	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
Commodity contracts:	(In millions)
Derivative assets	$	2		$	—		$	2
Derivative liabilities	(1		)	—			(1		)
Total commodity contracts	1			—			1
Interest rate contracts:
Derivative assets	1			(1		)	—
Derivative liabilities	(75		)	1			(74		)
Total interest rate contracts	(74		)	—			(74		)
Total derivative instruments	$	(73	)	$	—		$	(73	)

Effects of NRG Yield's accumulated OCI balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax

The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives:



	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
	(In millions)
Accumulated OCL beginning balance	$	(79	)	$	(149	)	$	(86	)	$	(99	)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	3			3			8			7
Mark-to-market of cash flow hedge accounting contracts	(10		)	(22		)	(8		)	(76		)
Accumulated OCL ending balance	(86		)	(168		)	(86		)	(168		)
Accumulated OCL attributable to noncontrolling interests	(3		)	(12		)	(3		)	(12		)
Accumulated OCL attributable to NRG Yield LLC	$	(83	)	$	(156	)	$	(83	)	$	(156	)
Losses expected to be realized from OCL during the next 12 months	$	18					$	18

Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Schedule of long-term debt



	June 30, 2017			December 31, 2016			June 30, 2017, interest rate % ^(a)	Letters of Credit Outstanding at June 30, 2017
	(In millions, except rates)
Long-term debt - affiliate, due 2019	$	337		$	337		3.580
Long-term debt - affiliate, due 2020	281			281			3.325
2024 Senior Notes	500			500			5.375
2026 Senior Notes	350			350			5.000
Project-level debt:
Agua Caliente Borrower 2, due 2038	41			—			5.430	17
Alpine, due 2022	142			145			L+1.750	37
Alta Wind I, lease financing arrangement, due 2034	234			242			7.015	16
Alta Wind II, lease financing arrangement, due 2034	186			191			5.696	23
Alta Wind III, lease financing arrangement, due 2034	193			198			6.067	23
Alta Wind IV, lease financing arrangement, due 2034	125			128			5.938	16
Alta Wind V, lease financing arrangement, due 2035	201			206			6.071	26
Alta Realty Investments, due 2031	31			31			7.000	—
Alta Wind Asset Management, due 2031	18			18			L+2.500	—
Avra Valley, due 2031	55			57			L+1.750	3
Blythe, due 2028	19			19			L+1.625	2
Borrego, due 2025 and 2038	68			69			L+ 2.750/5.650	5
CVSR, due 2037	757			771			2.339 - 3.775	—
CVSR Holdco Notes, due 2037	193			199			4.680	13
El Segundo Energy Center, due 2023	414			443			L+1.625 - L+2.250	82
Energy Center Minneapolis, due 2017 and 2025	85			96			5.950 -7.250	—
Energy Center Minneapolis Series D Notes, due 2031	125			125			3.550	—
Kansas South, due 2031	29			30			L+2.000	4
Laredo Ridge, due 2028	97			100			L+1.875	10
Marsh Landing, due 2017 and 2023	358			370			L+1.750 - L+1.875	49
Apple I LLC projects and related subsidiaries financing agreement, due 2030	27			27			6.000	—
Roadrunner, due 2031	36			37			L+1.625	5
South Trent Wind, due 2020	55			57			L+1.625	10
TA High Desert, due 2020 and 2032	48			49			L+2.500/5.150	—
Tapestry, due 2021	166			172			L+1.625	20
Utah Solar Portfolio, due 2022	284			287			L+2.625	11
Viento, due 2023	169			178			L+2.750	27
Walnut Creek, due 2023	299			310			L+1.625	60
WCEP Holdings, due 2023	45			46			L+3.000	—
Subtotal project-level debt:	4,500			4,601
Total debt	5,968			6,069
Less current maturities	(298		)	(291		)
Less net debt issuance costs	(59		)	(62		)
Total long-term debt	$	5,611		$	5,716

Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment



	Three months ended June 30, 2017
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	83		$	161		$	40		$	—		$	284
Cost of operations	15			35			27			—			77
Depreciation and amortization	26			47			5			—			78
General and administrative	—			—			—			6			6
Acquisition-related transaction and integration costs	—			—			—			1			1
Operating income (loss)	42			79			8			(7		)	122
Equity in earnings of unconsolidated affiliates	3			13			—			—			16
Other income, net	—			—			—			1			1
Interest expense	(14		)	(49		)	(2		)	(17		)	(82		)
Net Income (Loss)	$	31		$	43		$	6		$	(23	)	$	57
Total Assets	$	1,948		$	5,855		$	417		$	86		$	8,306



	Three months ended June 30, 2016
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	85		$	159		$	39		$	—		$	283
Cost of operations	16			34			27			—			77
Depreciation and amortization	20			50			5			—			75
General and administrative	—			—			—			3			3
Operating income (loss)	49			75			7			(3		)	128
Equity in earnings of unconsolidated affiliates	4			10			—			—			14
Other income, net	—			2			—			—			2
Interest expense	(12		)	(36		)	(1		)	(16		)	(65		)
Net Income (Loss)	$	41		$	51		$	6		$	(19	)	$	79



	Six months ended June 30, 2017
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	158		$	260		$	84		$	—		$	502
Cost of operations	37			67			57			—			161
Depreciation and amortization	50			93			10			—			153
General and administrative	—			—			—			10			10
Acquisition-related transaction and integration costs	—			—			—			2			2
Operating income (loss)	71			100			17			(12		)	176
Equity in earnings of unconsolidated affiliates	6			29			—			—			35
Other income, net	—			1			—			1			2
Interest expense	(26		)	(89		)	(5		)	(35		)	(155		)
Net Income (Loss)	$	51		$	41		$	12		$	(46	)	$	58
Total Assets	$	1,948		$	5,855		$	417		$	86		$	8,306



	Six months ended June 30, 2016
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	164		$	270		$	83		$	—		$	517
Cost of operations	39			67			56			—			162
Depreciation and amortization	40			99			10			—			149
General and administrative	—			—			—			5			5
Operating income (loss)	85			104			17			(5		)	201
Equity in earnings of unconsolidated affiliates	7			11			—			—			18
Other income, net	—			2			—			—			2
Interest expense	(23		)	(78		)	(3		)	(32		)	(136		)
Net Income (Loss)	$	69		$	39		$	14		$	(37	)	$	85

Related Party Transactions Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2017

Operations and Maintenance services [Member]

Condensed Consolidating Financial Information Disclosure [Abstract]

The following table summarizes material O&M costs recorded in the cost of operations line in the Company's consolidated statements of operations:



	Three months ended June 30,				Six months ended June 30,
	2017		2016		2017		2016
Thermal entities	$	7	$	8	$	15	$	15
Conventional entities	2		2		4		4
Total	$	9	$	10	$	19	$	19

Condensed Consolidating Financial Information Condensed Consolidating Financial Information (Tables)

6 Months Ended

Jun. 30, 2017

Condensed Cash Flow Statement [Table Text Block]

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Six Months ended June 30, 2017

(Unaudited)



	NRG Yield LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Consolidated
	(In millions)
Net Cash Provided by (Used in) Operating Activities	$	—		$	21		$	152		$	(1	)	$	172
Cash Flows from Investing Activities
Intercompany transactions between Yield LLC and subsidiaries	(40		)	—			—			40			—
Acquisition of Drop Down Assets	—			—			—			(131		)	(131		)
Capital expenditures	—			—			(13		)	—			(13		)
Decrease in notes receivable	—			—			9			—			9
Return of investment from unconsolidated affiliates	—			5			6			14			25
Net investments in unconsolidated affiliates	—			(26		)	(7		)	—			(33		)
Net Cash Used in Investing Activities	(40		)	(21		)	(5		)	(77		)	(143		)
Cash Flows from Financing Activities
Transfer of funds under intercompany cash management arrangement	(6		)	—			—			6			—
Net contributions from noncontrolling interests	—			—			2			13			15
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	—			—			(42		)	—			(42		)
(Payments of) proceeds from distributions	(97		)	—			(66		)	59			(104		)
Payment of debt issuance costs	—			—			(4		)	—			(4		)
Proceeds from Issuance of Class C units	14			—			—			—			14
Proceeds from the issuance of long-term debt — external	—			—			41			—			41
Payments for long-term debt	—			—			(142		)	—			(142		)
Net Cash (Used in) Provided by Financing Activities	(89		)	—			(211		)	78			(222		)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(129		)	—			(64		)	—			(193		)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	211			—			275			—			486
Cash, Cash Equivalents and Restricted Cash at End of Period	$	82		$	—		$	211		$	—		$	293

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Six Months Ended June 30, 2016

(Unaudited)



	NRG Yield LLC ^(a)			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries ^(a)			NRG Yield Operating LLC (Note Issuer)			Consolidated ^(a)
	(In millions)
Net Cash Provided by (Used in) Operating Activities	$	—		$	41		$	195		$	(17	)	$	219
Cash Flows from Investing Activities
Intercompany transactions from Yield LLC to subsidiaries	33			—			—			(33		)	—
Capital expenditures	—			—			(11		)	—			(11		)
Decrease in notes receivable	—			—			9			—			9
Return of investment from unconsolidated affiliates	—			1			(11		)	28			18
Net investments in unconsolidated affiliates	—			(44		)	—			(15		)	(59		)
Other	—			—			—			2			2
Net Cash Provided by (Used in) Investing Activities	33			(43		)	(13		)	(18		)	(41		)
Cash Flows from Financing Activities
Transfer of funds under intercompany cash management arrangement	49			2			—			(51		)	—
Net contributions from noncontrolling interests	—			—			—			8			8
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	—			—			(15		)	—			(15		)
(Payments of) proceeds from distributions	(83		)	—			(72		)	66			(89		)
Proceeds from the revolving credit facility	—			—			—			60			60
Payments for the revolving credit facility	—			—			—			(48		)	(48		)
Payments for long-term debt	—			—			(122		)	—			(122		)
Net Cash (Used in) Provided by Financing Activities	(34		)	2			(209		)	35			(206		)
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(1		)	—			(27		)	—			(28		)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	15			—			226			—			241
Cash, Cash Equivalents and Restricted Cash at End of Period	$	14		$	—		$	199		$	—		$	213

^(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

^(b) All significant intercompany transactions have been eliminated in consolidation.

Condensed Balance Sheet [Table Text Block]

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

June 30, 2017

(Unaudited)



	NRG Yield LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries		NRG Yield Operating LLC (Note Issuer)		Eliminations^(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	82	$	—	$	97	$	—	$	—		$	179
Restricted cash	—		—		114		—		—			114
Accounts receivable — trade	—		3		116		—		—			119
Accounts receivable — affiliate	2		—		—		—		—			2
Inventory	—		1		40		—		—			41
Derivative instruments	—		—		1		—		—			1
Notes receivable	—		—		14		—		—			14
Prepayments and other current assets	—		—		21		—		—			21
Total current assets	84		4		403		—		—			491
Net property, plant and equipment	—		59		5,263		—		—			5,322
Other Assets
Investment in consolidated subsidiaries	1,741		503		—		3,155		(5,399		)	—
Equity investments in affiliates	—		184		607		370		—			1,161
Notes receivable	—		—		7		—		—			7
Intangible assets, net	—		55		1,196		—		—			1,251
Derivative instruments	—		—		—		—		—			—
Other non-current assets	—		—		73		1		—			74
Total other assets	1,741		742		1,883		3,526		(5,399		)	2,493
Total Assets	$	1,825	$	805	$	7,549	$	3,526	$	(5,399	)	$	8,306

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

June 30, 2017

(Continued)



	NRG Yield LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
LIABILITIES AND MEMBERS' EQUITY	(In millions)
Current Liabilities
Current portion of long-term debt — external	$	—		$	—		$	298		$	—		$	—		$	298
Accounts payable	—			1			22			—			—			23
Accounts payable — affiliate	—			6			14			11			—			31
Derivative instruments	—			—			26			—			—			26
Accrued expenses and other current liabilities	—			1			33			25			—			59
Total current liabilities	—			8			393			36			—			437
Other Liabilities
Long-term debt — external	—			—			4,153			840			—			4,993
Long-term debt — affiliate	—			—			—			618			—			618
Accounts payable — affiliate	—			—			9			—			—			9
Derivative instruments	—			—			54			—			—			54
Other non-current liabilities	—			—			79			—			—			79
Total non-current liabilities	—			—			4,295			1,458			—			5,753
Total Liabilities	—			8			4,688			1,494			—			6,190
Commitments and Contingencies
Members' Equity
Contributed capital	1,807			853			2,824			1,980			(5,657		)	1,807
Retained earnings (accumulated deficit)	101			(54		)	63			(156		)	147			101
Accumulated other comprehensive loss	(83		)	(2		)	(87		)	(83		)	172			(83		)
Noncontrolling interest	—			—			61			291			(61		)	291
Total Members' Equity	1,825			797			2,861			2,032			(5,399		)	2,116
Total Liabilities and Members’ Equity	$	1,825		$	805		$	7,549		$	3,526		$	(5,399	)	$	8,306

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2016



	NRG Yield LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries		NRG Yield Operating LLC (Note Issuer)		Eliminations ^(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	211	$	—	$	110	$	—	$	—		$	321
Restricted cash	—		—		165		—		—			165
Accounts receivable — trade	—		2		90		—		—			92
Accounts receivable — affiliate	—		—		1		—		—			1
Inventory	—		2		37		—		—			39
Derivative instruments	—		—		2		—		—			2
Notes receivable	—		—		16		—		—			16
Prepayments and other current assets	—		—		19		1		—			20
Total current assets	211		4		440		1		—			656

Net property, plant and equipment	—		59		5,401		—		—			5,460
Other Assets
Investment in consolidated subsidiaries	1,780		527		—		3,212		(5,519		)	—
Equity investments in affiliates	—		171		600		381		—			1,152
Notes receivable	—		—		14		—		—			14
Intangible assets, net	—		56		1,230		—		—			1,286
Derivative instruments	—		—		1		—		—			1
Other non-current assets	—		—		50		1		—			51
Total other assets	1,780		754		1,895		3,594		(5,519		)	2,504
Total Assets	$	1,991	$	817	$	7,736	$	3,595	$	(5,519	)	$	8,620

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2016

(Continued)



	NRG Yield LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations ^(a)			Consolidated
LIABILITIES AND MEMBERS' EQUITY	(In millions)
Current Liabilities
Current portion of long-term debt — external	$	—		$	—		$	291		$	—		$	—		$	291
Accounts payable	—			2			18			3			—			23
Accounts payable — affiliate	—			7			15			18			—			40
Derivative instruments	—			—			32			—			—			32
Accrued expenses and other current liabilities	—			1			60			24			—			85
Total current liabilities	—			10			416			45			—			471
Other Liabilities
Long-term debt — external	—			—			4,259			839			—			5,098
Long-term debt — affiliate	—			—			—			618			—			618
Accounts payable — affiliate	—			—			9			—			—			9
Derivative instruments	—			—			44			—			—			44
Other non-current liabilities	—			—			76			—			—			76
Total non-current liabilities	—			—			4,388			1,457			—			5,845
Total Liabilities	—			10			4,804			1,502			—			6,316
Commitments and Contingencies
Members' Equity
Contributed capital	1,995			874			2,920			1,971			(5,765		)	1,995
Retained earnings (Accumulated deficit)	79			(65		)	35			(108		)	138			79
Accumulated other comprehensive loss	(83		)	(2		)	(87		)	(83		)	172			(83		)
Noncontrolling Interest	—			—			64			313			(64		)	313
Total Members' Equity	1,991			807			2,932			2,093			(5,519		)	2,304
Total Liabilities and Members’ Equity	$	1,991		$	817		$	7,736		$	3,595		$	(5,519	)	$	8,620

^(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Statement of Comprehensive Income [Table Text Block]

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended June 30, 2017

(Unaudited)



	NRG Yield LLC			Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Net Income	$	76		$	22	$	70		$	56		$	(167	)	$	57
Other Comprehensive Income
Unrealized gain on derivatives	(7		)	—		(6		)	(7		)	13			(7		)
Other comprehensive income	(7		)	—		(6		)	(7		)	13			(7		)
Comprehensive Income	69			22		64			49			(154		)	50
Less: Comprehensive loss attributable to noncontrolling interests	—			—		(1		)	(19		)	1			(19		)
Comprehensive Income Attributable to NRG Yield LLC	$	69		$	22	$	65		$	68		$	(155	)	$	69

^(a) All significant intercompany transactions have been eliminated in consolidation.

For the Six Months ended June 30, 2017

(Unaudited)



	NRG Yield LLC		Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Net Income	$	86	$	13	$	91		$	57		$	(189	)	$	58
Other Comprehensive Income
Unrealized loss on derivatives	—		—		—			—			—			—
Other comprehensive loss	—		—		—			—			—			—
Comprehensive Income	86		13		91			57			(189		)	58
Less: Comprehensive loss attributable to noncontrolling interests	—		—		(2		)	(28		)	2			(28		)
Comprehensive Income Attributable to NRG Yield LLC	$	86	$	13	$	93		$	85		$	(191	)	$	86

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

For the Three Months Ended June 30, 2016

(Unaudited)



	NRG Yield LLC^(a)			Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries ^(a)			NRG Yield Operating LLC (Note Issuer) ^(a)			Eliminations ^(b)			Consolidated ^(a)
	(In millions)
Net Income	$	94		$	30	$	84		$	79		$	(208	)	$	79
Other Comprehensive (Loss) Income
Unrealized (loss) gain on derivatives	(11		)	1		(18		)	(19		)	28			(19		)
Other comprehensive (loss) gain	(11		)	1		(18		)	(19		)	28			(19		)
Comprehensive Income	83			31		66			60			(180		)	60
Less: Comprehensive loss attributable to noncontrolling interests	—			—		—			(23		)	—			(23		)
Comprehensive Income Attributable to NRG Yield LLC	$	83		$	31	$	66		$	83		$	(180	)	$	83

^(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

^(b) All significant intercompany transactions have been eliminated in consolidation.

For the Six Months Ended June 30, 2016

(Unaudited)



	NRG Yield LLC ^(a)			Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries ^(a)			NRG Yield Operating LLC (Note Issuer) ^(a)			Eliminations ^(b)			Consolidated ^(a)
	(In millions)
Net Income	$	111		$	26	$	102		$	85		$	(239	)	$	85
Other Comprehensive Loss
Unrealized loss on derivatives	(60		)	—		(64		)	(69		)	124			(69		)
Other comprehensive loss	(60		)	—		(64		)	(69		)	124			(69		)
Comprehensive Income	51			26		38			16			(115		)	16
Less: Comprehensive loss attributable to noncontrolling interests	—			—		—			(35		)	—			(35		)
Comprehensive Loss Attributable to NRG Yield LLC	$	51		$	26	$	38		$	51		$	(115	)	$	51

^(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

^(b) All significant intercompany transactions have been eliminated in consolidation.

Condensed Income Statement [Table Text Block]

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME

For the Three Months Ended June 30, 2017

(Unaudited)



	NRG Yield LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	5	$	279		$	1		$	(1	)	$	284
Operating Costs and Expenses
Cost of operations	—		3		74			1			(1		)	77
Depreciation and amortization	—		1		77			—			—			78
General and administrative	—		—		—			6			—			6
Acquisition-related transaction and integration costs	—		—		—			1			—			1
Total operating costs and expenses	—		4		151			8			(1		)	162
Operating Income (Loss)	—		1		128			(7		)	—			122
Other Income (Expense)
Equity in earnings of consolidated affiliates	75		21		—			71			(167		)	—
Equity in earnings of unconsolidated affiliates	—		—		6			10			—			16
Other income, net	1		—		—			—			—			1
Interest expense	—		—		(64		)	(18		)	—			(82		)
Total other income (expense), net	76		21		(58		)	63			(167		)	(65		)
Net Income	76		22		70			56			(167		)	57
Less: Net loss attributable to noncontrolling interests	—		—		(1		)	(19		)	1			(19		)
Net Income Attributable to NRG Yield LLC	$	76	$	22	$	71		$	75		$	(168	)	$	76

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME

For the Six Months ended June 30, 2017

(Unaudited)



	NRG Yield LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Yield Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	10	$	492		$	1		$	(1	)	$	502
Operating Costs and Expenses
Cost of operations	—		7		154			1			(1		)	161
Depreciation and amortization	—		2		151			—			—			153
General and administrative	—		—		—			10			—			10
Acquisition-related transaction and integration costs	—		—		—			2			—			2
Total operating costs and expenses	—		9		305			13			(1		)	326
Operating Income (Loss)	—		1		187			(12		)	—			176
Other Income (Expense)
Equity in earnings of consolidated affiliates	85		10		—			94			(189		)	—
Equity in earnings of unconsolidated affiliates	—		2		22			11			—			35
Other income, net	1		—		1			—			—			2
Interest expense	—		—		(119		)	(36		)	—			(155		)
Total other income (expense), net	86		12		(96		)	69			(189		)	(118		)
Net Income	86		13		91			57			(189		)	58
Less: Net loss attributable to noncontrolling interests	—		—		(2		)	(28		)	2			(28		)
Net Income Attributable to NRG Yield LLC	$	86	$	13	$	93		$	85		$	(191	)	$	86

^(a) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended June 30, 2016

(Unaudited)



	NRG Yield LLC^(a)		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries ^(a)			NRG Yield Operating LLC (Note Issuer) ^(a)			Eliminations ^(b)			Consolidated^(a)
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	5	$	278		$	—		$	—		$	283
Operating Costs and Expenses
Cost of operations	—		4		73			—			—			77
Depreciation and amortization	—		1		74			—			—			75
General and administrative	—		—		—			3			—			3
Total operating costs and expenses	—		5		147			3			—			155
Operating Income (Loss)	—		—		131			(3		)	—			128
Other Income (Expense)
Equity in earnings of consolidated affiliates	94		24		—			90			(208		)	—
Equity in earnings of unconsolidated affiliates	—		6		1			7			—			14
Other income, net	—		—		2			—			—			2
Interest expense	—		—		(50		)	(15		)	—			(65		)
Total other income (expense), net	94		30		(47		)	82			(208		)	(49		)
Net Income	94		30		84			79			(208		)	79
Less: Net loss attributable to noncontrolling interests	—		—		—			(15		)	—			(15		)
Net Income Attributable to NRG Yield LLC	$	94	$	30	$	84		$	94		$	(208	)	$	94

^(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

^(b) All significant intercompany transactions have been eliminated in consolidation.

NRG YIELD LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF INCOME

For the Six Months Ended June 30, 2016

(Unaudited)



	NRG Yield LLC ^(a)		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries ^(a)			NRG Yield Operating LLC (Note Issuer) ^(a)			Eliminations ^(b)			Consolidated^(a)
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	10	$	507		$	—		$	—		$	517
Operating Costs and Expenses
Cost of operations	—		7		155			—			—			162
Depreciation and amortization	—		2		147			—			—			149
General and administrative	—		—		—			5			—			5
Total operating costs and expenses	—		9		302			5			—			316
Operating Income (Loss)	—		1		205			(5		)	—			201
Other Income (Expense)
Equity in income of consolidated affiliates	111		17		—			111			(239		)	—
Equity in earnings of unconsolidated affiliates	—		8		—			10			—			18
Other income, net	—		—		2			—			—			2
Interest expense	—		—		(105		)	(31		)	—			(136		)
Total other income (expense), net	111		25		(103		)	90			(239		)	(116		)
Net Income	111		26		102			85			(239		)	85
Less: Net loss attributable to noncontrolling interests	—		—		—			(26		)	—			(26		)
Net Income Attributable to NRG Yield LLC	$	111	$	26	$	102		$	111		$	(239	)	$	111

^(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

^(b) All significant intercompany transactions have been eliminated in consolidation.

Nature of Business (Details)
$ in Millions

6 Months Ended

Mar. 27, 2017

USD ($)

Jun. 30, 2017

USD ($)

Jun. 30, 2016

USD ($)

^[1]

Sep. 01, 2016

USD ($)

Megawatts Thermal Equivalent, Available Under right-to-use Provisions

134

Weighted Average Remaining PPA Term

16 years

Proceeds from the issuance of Class C units | $

$ 14

$ 0

Power Generation Capacity, Megawatts, including portion attributable to noncontrolling interest

5,008

Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind [Member]

4,879

Distributed Solar

^[2]

Wind Farms [Member]

^[2]

1,999

Thermal [Member]

Steam and Chilled Water Capacity, Megawatts Thermal Equivalent

100.00%

^[2],[3]

1,319

Power Generation Capacity, Megawatts and Megawatt Thermal Equivalent

123

^[2]

123

NRG Energy Center Dover [Member]

Conventional Generation [Member]

100.00%

^[2]

1,945

Utility-Scale Solar

Spring Canyon [Member] | Wind Farms [Member]

^[2]

921

Power Generation Capacity, Megawatts attributed to noncontrolling interest

NRG Yield, Inc. [Member]

Proceeds from the issuance of Class C units | $

$ 16

NRG Yield LLC

Proceeds from the issuance of Class C units | $

$ 14

NRG Yield LLC | NRG

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest

55.10%

GenConn Middletown | Conventional Generation [Member]

50.00%

GenConn Devon [Member] | Conventional Generation [Member]

^[2]

50.00%

Marsh Landing | Conventional Generation [Member]

^[2]

100.00%

El Segundo [Member] | Conventional Generation [Member]

^[2]

720

100.00%

Walnut Creek [Member] | Conventional Generation [Member]

^[2]

550

100.00%

Agua Caliente [Member] | Utility-Scale Solar

^[2]

485

16.00%

Alpine [Member] | Utility-Scale Solar

^[2]

100.00%

Avenal [Member] | Utility-Scale Solar

^[2]

50.00%

Avra Valley | Utility-Scale Solar

^[2]

100.00%

NRG Solar Blythe LLC [Member] | Utility-Scale Solar

^[2]

100.00%

Borrego | Utility-Scale Solar

^[2]

100.00%

CVSR [Member] | Utility-Scale Solar

^[2]

100.00%

100.00%

Desert Sunlight [Member] | Utility-Scale Solar

^[2]

250

Kansas South [Member] | Utility-Scale Solar

25.00%

100.00%

Roadrunner | Utility-Scale Solar

^[2]

100.00%

TA - High Desert LLC [Member] | Utility-Scale Solar

^[2]

100.00%

Utah Portfolio [Member] | Utility-Scale Solar

^[2]

^[4]

50.00%

AZ DG Solar Projects | Distributed Solar

^[2],[4]

265

100.00%

PFMG DG Solar Projects | Distributed Solar

^[2]

100.00%

Alta I [Member] | Wind Farms [Member]

^[2]

100.00%

Alta II [Member] | Wind Farms [Member]

^[2]

150

100.00%

Alta III [Member] | Wind Farms [Member]

^[2]

150

100.00%

Alta IV [Member] | Wind Farms [Member]

^[2]

150

100.00%

Alta V [Member] | Wind Farms [Member]

^[2]

102

100.00%

Alta X [Member] | Wind Farms [Member]

^[2]

168

^[5]

100.00%

Alta XI [Member] | Wind Farms [Member]

^[2],[5]

137

^[5]

100.00%

South Trent | Wind Farms [Member]

^[2],[5]

100.00%

Spanish Fork [Member] | Wind Farms [Member]

^[2]

101

^[5],[6]

75.00%

Laredo Ridge [Member] | Wind Farms [Member]

^[2],[5],[6]

100.00%

Taloga [Member] | Wind Farms [Member]

^[2]

100.00%

Pinnacle [Member] | Wind Farms [Member]

^[2]

130

100.00%

Buffalo Bear [Member] | Wind Farms [Member]

^[2]

100.00%

Spring Canyon II [Member] | Wind Farms [Member]

^[2]

^[5]

90.10%

Spring Canyon III [Member] | Wind Farms [Member]

^[2],[5]

^[5]

90.10%

Crosswinds [Member] | Wind Farms [Member]

^[2],[5]

^[5],[6]

74.30%

Elbow Creek [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

75.00%

Elkhorn Ridge Wind, LLC [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

50.30%

Forward [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

75.00%

Goat Wind [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

74.90%

Hardin [Member] | Wind Farms [Member]

^[2],[5],[6]

113

^[5],[6]

74.30%

Lookout [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

75.00%

Odin Wind Farm [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

74.90%

San Juan Mesa Wind Project, LLC [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

56.30%

Sleeping Bear [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

75.00%

Wildorado [Member] | Wind Farms [Member]

^[2],[5],[6]

^[5],[6]

74.90%

Thermal [Member] | Thermal [Member]

^[2],[5],[6]

121

NRG Energy Center Dover [Member] | Thermal [Member]

^[2]

^[2]

103

CVSR [Member]

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $

$ 496

Southern California Edison [Member] | Desert Sunlight [Member] | Utility-Scale Solar

Pacific Gas and Electric [Member] | Desert Sunlight [Member] | Utility-Scale Solar

^[2]

Common Class D [Member] | NRG Yield LLC

^[2]

Sale of Stock, Percentage of Ownership after Transaction

100.00%

Common Class B [Member] | NRG Yield LLC

Sale of Stock, Percentage of Ownership after Transaction

100.00%

Common Class A [Member] | NRG Yield LLC

Sale of Stock, Percentage of Ownership after Transaction

100.00%

Agua Caliente [Member]

16.00%

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $

$ 328

Acquisition of businesses, net of cash acquired | $

(130)

Business Acquisition, Consideration Transferred, Working Capital | $

$ 1

[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of June 30, 2017.
[3]	(c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,008 MWs.
[4]	e) Represents interests in Four Brothers Solar, LLC, Granite Mountain Holdings, LLC, and Iron Springs Holdings, LLC, all acquired as part of the March 2017 Drop Down Assets (ownership percentage is based upon cash to be distributed).
[5]	(b) Projects are part of tax equity arrangements.
[6]	(f) Projects are part of NRG Wind TE Holdco portfolio.

Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2017

Mar. 31, 2017

Jun. 30, 2016

^[3],[4]

Jun. 30, 2017

Jun. 30, 2016

Dec. 31, 2016

Summary of Significant Accounting Policies [Line Items]

Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment

$ 179,000

$ 321,000

1,102,000

951,000

Capital contributions from tax equity investors, net of distributions

291,000

313,000

15,000

$ 8,000

^[1]

Distributions to NRG for NRG Wind TE Holdco

(42,000)

(15,000)

^[1],[2]

Comprehensive loss

$ (19,000)

$ (23,000)

$ (28,000)

(35,000)

^[3],[4]

Dividends Payable, Date Declared

Jul. 25, 2017

Common Stock, Dividends, Per Share, Declared

$ 0.28

Dividends Payable, Date to be Paid

Sep. 15, 2017

Dividends Payable, Date of Record

Sep. 01, 2017

Dividends Per Class A Common Share

$ 0.27

Intangible assets, accumulated amortization

$ 198,000

163,000

Sale of Stock, Number of Shares Issued in Transaction

114,000

$ 114,000

$ 165,000

934,139

Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions

$ 14,000

$ 0

^[2]

163

ATM program, dollar value of shares remaining

$ 134,000

134,000

Financial Institutions [Member]

Summary of Significant Accounting Policies [Line Items]

Capital contributions from tax equity investors, net of distributions

13,000

NRG Yield, Inc. [Member]

Summary of Significant Accounting Policies [Line Items]

November 2015 Drop Down Assets [Member]

16,000

Summary of Significant Accounting Policies [Line Items]

Distributions to NRG for NRG Wind TE Holdco

$ (7,000)

Common Class A [Member]

Summary of Significant Accounting Policies [Line Items]

Dividends Per Class A Common Share

$ 0.26

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[4]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Business Acquisitions Business Acquisitions - March 2017 Drop Down(Details)
$ in Millions

Mar. 27, 2017

USD ($)

Jun. 30, 2017

USD ($)

Dec. 31, 2016

USD ($)

$ 1,161

$ 1,152

$ 59

$ 62

Agua Caliente [Member]

Agua Caliente Borrower 2 [Member]

16.00%

Percentage of NRG's Ownership

31.00%

Power Generation Capacity, Megawatts | MW

Power Purchase Agreement Period

25 years

Remaining Power Purchase Agreement term

22 years

Non-Recourse Debt

$ 41

Pro-Rate Share of Debt Held by Unconsolidated Affiliates

$ 135

Utah Portfolio [Member]

Remaining Power Purchase Agreement term

20 years

Percentage of Cash Available for Distributions

50.00%

Non-Recourse Debt

$ 287

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents

Business Combination, Consideration Transferred

130

Business Acquisition, Consideration Transferred, Working Capital

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt

328

Business Combination, Separately Recognized Transactions, Net Gains and Losses

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets

456

462

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities

^[1]

320

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities

323

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net

139

NRG [Member] | Agua Caliente Borrower 2 [Member]

$ 8

NRG [Member] | Utah Portfolio [Member]

51.00%

Percentage of Cash Available for Distributions

50.00%

[1]	(a) Net of $8 million of debt issuance costs.

Business Acquisitions Business Acquisitions - CVSR (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Mar. 27, 2017

Sep. 02, 2016

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Dec. 31, 2016

Sep. 01, 2016

$ 284.0

$ 283.0

^[1],[2]

$ 502.0

$ 517.0

^[1],[2]

491.0

$ 656.0

59.0

62.0

5,322.0

5,460.0

8,306.0

8,620.0

6,190.0

6,316.0

(83.0)

Net Income (Loss), Including Portion Attributable to Noncontrolling Interest

122.0

128.0

^[1],[2]

176.0

201.0

^[1],[2]

57.0

79.0

^[1],[2]

58.0

85.0

^{[1],[2],[3],[4]}

$ 5,968.0

6,069.0

CVSR [Member]

Business Acquisition, Percentage of Voting Interests Acquired

51.05%

Payments to Acquire Businesses, Gross

$ 78.5

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt

$ 496.0

Scenario, Previously Reported [Member]

258.0

478.0

Net Income (Loss), Including Portion Attributable to Noncontrolling Interest

113.0

182.0

74.0

79.0

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt

0.0

$ 328.0

8.0

Net Income (Loss), Including Portion Attributable to Noncontrolling Interest

0.0

1.0

2.0

Business Combination, Separately Recognized Transactions, Net Gains and Losses

8.0

Business Combination, Consideration Transferred

$ 130.0

CVSR [Member]

25.0

39.0

Net Income (Loss), Including Portion Attributable to Noncontrolling Interest

15.0

19.0

$ 4.0

Business Combination, Separately Recognized Transactions, Net Gains and Losses

112.0

Business Combination, Consideration Transferred

$ 6.0

Utility-Scale Solar [Member] | CVSR [Member]

CVSR Financing Agreement [Member]

100.00%

CVSR Financing Agreement [Member] | CVSR [Member]

$ 757.0

771.0

CVSR Holdco due 2037 [Member]

771.0

CVSR Holdco due 2037 [Member] | CVSR [Member]

$ 193.0

$ 199.0

Schedule of Equity Method Investments [Line Items]

$ 200.0

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[4]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Business Acquisitions TE Holdco (Details) - USD ($) $ in Millions	Aug. 02, 2017	Mar. 27, 2017	Aug. 01, 2017
March 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 130.0
Subsequent Event [Member] \| August 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Percentage of NRG's Ownership			25.00%
Business Combination, Consideration Transferred	$ 41.5

Variable Interest Entities Variable Interest Entities - Consolidated Entities (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Total other assets	$ 2,493	$ 2,504
Net property, plant and equipment	5,322	5,460
Total Assets	8,306	8,620
Total Liabilities	6,190	$ 6,316
November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	184
Net property, plant and equipment	428
Intangible Assets, Net (Excluding Goodwill)	2
Total Assets	614
Total Liabilities	203
Noncontrolling Interest in Variable Interest Entity	125
Net Assets	286
Alta X and XI TE Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	22
Net property, plant and equipment	449
Intangible Assets, Net (Excluding Goodwill)	268
Total Assets	739
Total Liabilities	8
Noncontrolling Interest in Variable Interest Entity	102
Net Assets	629
Spring Canyon [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	3
Net property, plant and equipment	98
Intangible Assets, Net (Excluding Goodwill)	0
Total Assets	101
Total Liabilities	6
Noncontrolling Interest in Variable Interest Entity	64
Net Assets	$ 31

Variable Interest Entities Variable Interest Entities - Unconsolidated Entities (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Dec. 31, 2016

$ 284

$ 283

^[1],[2]

$ 502

$ 517

^[1],[2]

1,161

$ 1,152

122

128

^[1],[2]

176

201

^[1],[2]

^[1],[2]

^{[1],[2],[3],[4]}

491

656

437

471

Schedule of Equity Method Investments [Line Items]

5,753

5,845

Utah Portfolio [Member]

$ 0

Assets, Noncurrent

1,101

1,105

Four Brothers Solar [Member]

$ 38

Schedule of Equity Method Investments [Line Items]

Granite Mountain Holdings [Member]

226

Schedule of Equity Method Investments [Line Items]

Iron Springs Holdings [Member]

Schedule of Equity Method Investments [Line Items]

NRG DGPV Holdco 1 [Member]

Schedule of Equity Method Investments [Line Items]

NRG DGPV Holdco 2 [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of Equity Method Investments [Line Items]

NRG RPV Holdco [Member]

Gen Conn Energy LLC [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of Equity Method Investments [Line Items]

104

NRG DGPV Holdco [Member]

NRG [Member] | NRG DGPV Holdco 2 [Member]

Schedule of Equity Method Investments [Line Items]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

$ 9

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[4]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Variable Interest Entities - Utah Solar Portfolio (Details) - Utah Portfolio [Member]	Jun. 30, 2017
Variable Interest Entity [Line Items]
Percentage of Cash Available for Distributions	50.00%
Capital Unit, Class A [Member]
Variable Interest Entity [Line Items]
Percentage of Ownership	100.00%
Financial Institutions [Member] \| Capital Unit, Class B [Member]
Variable Interest Entity [Line Items]
Taxable Income Allocation, Pre-Flip	99.00%
Taxable Income Allocation, Post-Flip	50.00%

Variable Interest Entities Variable Interest Entities - Debt Held by Unconsolidated Affiliates (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 27, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Long-term Debt	$ 5,968		$ 6,069
Agua Caliente Borrower 2 [Member]
Schedule of Equity Method Investments [Line Items]
Pro-Rate Share of Debt Held by Unconsolidated Affiliates		$ 135
Agua Caliente [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		16.00%
Long-term Debt	$ 843
Debt Instrument, Basis Spread on Libor Rate		0.40%

Fair Value of Financial Instruments Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt — affiliate	$ 618	$ 618
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Net	21	30
Long-term debt — affiliate	618
Long-term Debt and Capital Lease Obligations, Including Current Maturities	5,350	5,451
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Net	21	30
Long-term debt — affiliate	625	608
Long-term Debt and Capital Lease Obligations, Including Current Maturities	5,377	5,435
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	877	833
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 5,125	$ 5,210

Fair Value of Financial Instruments Fair Value of Financial Instruments - Recurring Fair Value (Details) - USD ($)

Jun. 30, 2017

Dec. 31, 2016

$ 1,000,000

$ 3,000,000

Fair Value, Inputs, Level 1 [Member]

80,000,000

76,000,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Inputs, Level 2 [Member]

^[1]

1,000,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

^[1]

1,000,000

2,000,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

^[1]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]

^[1]

80,000,000

76,000,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Derivative Assets (Liabilities), at Fair Value, Net

Interest Rate Contract [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

1,000,000

Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

78,000,000

75,000,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

1,000,000

Commodity Contract [Member]

78,000,000

75,000,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

1,000,000

2,000,000

Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

2,000,000

1,000,000

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

1,000,000

Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

1,000,000

$ 2,000,000

$ 1,000,000

[1]	(a) There were no derivative assets or liabilities classified as Level 1 as of June 30, 2017. There were no derivative assets or liabilities classified as Level 3 as of June 30, 2017 and December 31, 2016.

Fair Value of Financial Instruments Fair Value of Financial Instruments - Credit Risk and Derivative FV Measurements (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assets, Measured on Recurring Basis, Valuation Techniques, Impact of Credit Reserve to Fair Value	$ 1
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 3,000
Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period	5 years

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 1		$ 1		$ 3
Derivative Liability, Fair Value, Gross Liability	80		80		76
Derivative, Collateral, Right to Reclaim Cash	0		0		0
Derivative, Collateral, Obligation to Return Cash	0		0		0
Derivative Asset	1		1
Fair Value of Gross Derivative Assets/(Liabilities), Net	(79)		(79)		(73)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0		0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(79)		(79)		(73)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		0		1
Derivative Liability, Fair Value, Gross Liability	24		24		65
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1		1		2
Derivative Liability, Fair Value, Gross Liability	56		56		11
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1		1		2
Derivative Liability, Fair Value, Gross Liability	2		2		1
Derivative Asset, Fair Value, Gross Liability	1		1		0
Derivative Asset	0		0		2
Derivative Liability, Fair Value, Gross Asset	1		1		0
Derivative Liability	1		1		1
Fair Value of Gross Derivative Assets/(Liabilities), Net	(1)		(1)		1
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0		0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(1)		(1)		1
Interest Rate Contract Current [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Gross Liability	8		8		26
Interest Rate Contract Current [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Gross Liability	17		17		5
Interest Rate Contract Non Current [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		0		1
Derivative Liability, Fair Value, Gross Liability	16		16		39
Interest Rate Contract Non Current [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		0		0
Derivative Liability, Fair Value, Gross Liability	37		37		5
Commodity Contract Current [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1		1		2
Derivative Liability, Fair Value, Gross Liability	1		1		1
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					1
Derivative Liability, Fair Value, Gross Liability	78		78		75
Derivative Asset, Fair Value, Gross Liability					1
Derivative Asset					0
Derivative Liability, Fair Value, Gross Asset	0		0		1
Derivative Liability	78		78		74
Fair Value of Gross Derivative Assets/(Liabilities), Net	(78)		(78)		(74)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0		0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(78)		(78)		(74)
Commodity Contract Non Current [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					0
Derivative Liability, Fair Value, Gross Liability	1		1		0
United States of America, Dollars \| Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,045		2,045		2,070
MMbtu [Member] \| Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2		2		$ 3
Interest Expense [Member] \| Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 11	$ 2	$ 9	$ 9

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (86)	$ (168)	$ (86)	$ (168)	$ (79)	$ (86)	$ (149)	$ (99)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	3	3	8	7
Mark-to-market of cash flow hedge accounting contracts	(10)	(22)	(8)	(76)
Losses expected to be realized from OCL during the next 12 months			18
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			0	0
Noncontrolling Interest [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	(3)	(12)	(3)	(12)
Successor [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (83)	$ (156)	$ (83)	$ (156)

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - Impact on Statement of Operations (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest Rate Contract [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 11,000,000	$ 2,000,000	$ 9,000,000	$ 9,000,000
Commodity Contract [Member] \| Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives			$ 0

Long-term Debt Long-term Debt - Debt Table (Details) - USD ($)
$ in Millions

2 Months Ended

6 Months Ended

Dec. 31, 2016

Jun. 30, 2017

Mar. 27, 2017

$ 618

6,069

5,968

Deferred Finance Costs, Net

(291)

(298)

(62)

(59)

Long-term Debt, Excluding Current Maturities

5,716

5,611

5.375% Senior Notes due in 2024 [Member]

Senior Notes

500

$ 500

5.00% Senior Notes due in 2026 [Member]

^[1]

5.375%

Senior Notes

350

$ 350

Agua Caliente Borrower 2 [Member]

^[1]

5.00%

$ 41

Intercompany Credit Agreement due 2019 [Member]

^[1]

5.43%

337

$ 337

Intercompany Credit Agreement due 2020 [Member]

^[1]

3.58%

281

$ 281

NRG Yield Revolving Credit Facility [Member]

^[1]

3.325%

Debt Instrument, Description of Variable Rate Basis

1 month LIBOR

Alta Wind I, lease financing arrangement, due 2034 [Member]

2.75%

242

$ 234

Alta Wind II, lease financing arrangement, due 2034 [Member]

^[1]

7.015%

191

$ 186

Alta Wind III, lease financing arrangement, due 2034 [Member]

^[1]

5.696%

198

$ 193

Alta Wind IV, lease financing arrangement, due 2034 [Member]

^[1]

6.067%

128

$ 125

Alta Wind V, lease financing arrangement, due 2035 [Member]

^[1]

5.938%

206

$ 201

Alta Realty Investments, due 2031 [Member]

^[1]

6.071%

$ 31

Alta Wind Asset Management, due 2031 [Member]

^[1]

7.00%

Debt Instrument, Description of Variable Rate Basis

$ 18

3 month LIBOR

West Holdings Credit Agreement [Member]

2.375%

Debt Instrument, Description of Variable Rate Basis

443

$ 414

3 month LIBOR

West Holdings Credit Agreement due 2023 Tranche A [Member]

Marsh Landing Term Loan Facility [Member]

1.625%

Walnut Creek Energy, LLC, due in 2023 [Member]

370

$ 358

Debt Instrument, Description of Variable Rate Basis

310

$ 299

3 month LIBOR

Tapestry Wind LLC due in 2021 [Member]

1.625%

Debt Instrument, Description of Variable Rate Basis

172

$ 166

3-Month LIBOR

Viento Funding II, Inc., due in 2023 [Member]

1.625%

Debt Instrument, Description of Variable Rate Basis

178

$ 169

1-Month LIBOR

NRG Energy Center Minneapolis LLC Senior Secured Notes [Member]

2.75%

NRG Energy Center Minneapolis Series D Notes [Member]

$ 85

125

$ 125

Laredo Ridge Wind, LLC, due in 2026 [Member]

^[1]

3.55%

Debt Instrument, Description of Variable Rate Basis

100

$ 97

3-Month LIBOR

South Trent Financing Agreement [Member]

1.875%

Debt Instrument, Description of Variable Rate Basis

$ 55

3-Month LIBOR

Avra Valley Financing Agreement [Member]

1.625%

Debt Instrument, Description of Variable Rate Basis

$ 55

3-Month LIBOR

High Desert Facility [Member]

1.75%

WCEP Holdings, LLC, due in 2023 [Member]

$ 48

Debt Instrument, Description of Variable Rate Basis

$ 45

3-Month LIBOR

Roadrunner Financing Agreement [Member]

3.00%

Debt Instrument, Description of Variable Rate Basis

$ 36

3-Month LIBOR

Utah Solar Portfolio, due 2022 [Member]

1.625%

Debt Instrument, Description of Variable Rate Basis

287

$ 284

$ 287

1-Month LIBOR

Proceeds from Issuance of Debt

2.625%

Kansas South Facility, due 2031 [Member]

Debt Instrument, Description of Variable Rate Basis

$ 29

6-Month LIBOR

NRG Solar Blythe LLC Credit Agreement Due 2028 [Member]

2.00%

Debt Instrument, Description of Variable Rate Basis

$ 19

3-Month LIBOR

PFMG Financing Agreement [Member]

1.625%

$ 27

^[1]

6.00%

Project [Domain]

West Holdings Credit Agreement due 2023 Tranche B [Member]

4,601

$ 4,500

Marsh Landing Tranche A due December 2017 [Member]

2.25%

Debt Instrument, Description of Variable Rate Basis

3 month LIBOR

Marsh Landing Tranche B due 2023 [Member]

1.75%

Debt Instrument, Description of Variable Rate Basis

3 month LIBOR

Alpine Financing Agreement, due 2022 [Member]

1.875%

Debt Instrument, Description of Variable Rate Basis

145

$ 142

3-Month LIBOR

NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2017 [Member]

1.75%

NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2025 [Member]

5.95%

Borrego Financing Agreement, due 2024 [Member]

7.25%

Debt Instrument, Description of Variable Rate Basis

$ 68

3-Month LIBOR

CVSR Financing Agreement [Member]

2.50%

CVSR Holdco due 2037 [Member]

771

$ 757

$ 199

$ 193

Borrego Financing Agreement, due 2038 [Member]

^[1]

4.68%

High Desert Facility, due 2033 [Member]

5.65%

Debt Instrument, Description of Variable Rate Basis

3-Month LIBOR

TA - High Desert, due 2023 [Member]

2.50%

Letter of Credit [Member] | Agua Caliente Borrower 2 [Member]

5.15%

Letter of Credit [Member] | NRG Yield Revolving Credit Facility [Member]

$ 17

Letter of Credit [Member] | Alta Wind I, lease financing arrangement, due 2034 [Member]

Letter of Credit [Member] | Alta Wind II, lease financing arrangement, due 2034 [Member]

Letter of Credit [Member] | Alta Wind III, lease financing arrangement, due 2034 [Member]

Letter of Credit [Member] | Alta Wind IV, lease financing arrangement, due 2034 [Member]

Letter of Credit [Member] | Alta Wind V, lease financing arrangement, due 2035 [Member]

Letter of Credit [Member] | Alta Realty Investments, due 2031 [Member]

Letter of Credit [Member] | Alta Wind Asset Management, due 2031 [Member]

Letter of Credit [Member] | West Holdings Credit Agreement [Member]

Letter of Credit [Member] | Marsh Landing Term Loan Facility [Member]

Letter of Credit [Member] | Walnut Creek Energy, LLC, due in 2023 [Member]

Letter of Credit [Member] | Tapestry Wind LLC due in 2021 [Member]

Letter of Credit [Member] | Viento Funding II, Inc., due in 2023 [Member]

Letter of Credit [Member] | NRG Energy Center Minneapolis LLC Senior Secured Notes [Member]

Letter of Credit [Member] | NRG Energy Center Minneapolis Series D Notes [Member]

Letter of Credit [Member] | Laredo Ridge Wind, LLC, due in 2026 [Member]

Letter of Credit [Member] | South Trent Financing Agreement [Member]

Letter of Credit [Member] | Avra Valley Financing Agreement [Member]

Letter of Credit [Member] | High Desert Facility [Member]

Letter of Credit [Member] | WCEP Holdings LLC [Member]

Letter of Credit [Member] | Roadrunner Financing Agreement [Member]

Letter of Credit [Member] | Utah Solar Portfolio, due 2022 [Member]

Letter of Credit [Member] | Kansas South Facility, due 2031 [Member]

Letter of Credit [Member] | NRG Solar Blythe LLC Credit Agreement Due 2028 [Member]

Letter of Credit [Member] | PFMG Financing Agreement [Member]

Letter of Credit [Member] | Alpine Financing Agreement, due 2022 [Member]

Letter of Credit [Member] | Borrego Financing Agreement, due 2024 [Member]

Letter of Credit [Member] | CVSR Financing Agreement [Member]

Letter of Credit [Member] | CVSR Holdco due 2037 [Member]

Minimum [Member] | CVSR Financing Agreement [Member]

$ 13

Maximum [Member] | CVSR Financing Agreement [Member]

2.339%

3.775%

[1]	(a) As of June 30, 2017, L+ equals 3 month LIBOR plus x%, except for the Utah Solar Portfolio and NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, where L+ equals 1 month LIBOR plus x% and Kansas South, where L+ equals 6 month LIBOR plus x%.

Long-term Debt Long-term Debt - Debt Disclosures (Details) - USD ($)
$ in Millions

2 Months Ended

6 Months Ended

Dec. 31, 2016

Jun. 30, 2017

Mar. 27, 2017

Mar. 16, 2017

Feb. 17, 2017

Nov. 02, 2016

NRG Yield Revolving Credit Facility [Member]

$ 6,069

$ 5,968

Line of Credit Facility, Fair Value of Amount Outstanding

$ 0

NRG Energy Center Minneapolis Series F Notes [Member]

2.75%

Credit Facility, Maximum Borrowing Capacity, Amendment

$ 10

Line of Credit Facility, Maximum Borrowing Capacity

4.60%

$ 80

Utah Solar Portfolio, due 2022 [Member]

287

$ 284

$ 287

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt

2.625%

$ 222

Proceeds from Issuance of Debt

Agua Caliente Borrower 1, due 2038 [Member]

Agua Caliente Borrower 2 [Member]

$ 130

^[1]

5.43%

Letter of Credit [Member] | NRG Yield Revolving Credit Facility [Member]

$ 0

$ 41

Letter of Credit [Member] | Utah Solar Portfolio, due 2022 [Member]

Letter of Credit [Member] | Agua Caliente Borrower 2 [Member]

$ 17

[1]	(a) As of June 30, 2017, L+ equals 3 month LIBOR plus x%, except for the Utah Solar Portfolio and NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, where L+ equals 1 month LIBOR plus x% and Kansas South, where L+ equals 6 month LIBOR plus x%.

Segment Reporting (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Dec. 31, 2016

$ 284

$ 283

^[1],[2]

$ 502

$ 517

^[1],[2]

161

162

^[1],[2]

153

149

^[1],[2]

^[1],[2]

^[2]

122

128

^[1],[2]

176

201

^[1],[2]

^[1],[2]

^[1],[2],[3]

^[1],[2]

(82)

(65)

^[1],[2]

(155)

(136)

^[1],[2]

^[1],[2]

^{[1],[2],[3],[4]}

Conventional Generation [Member]

8,306

$ 8,620

158

164

(14)

(12)

(26)

(23)

1,948

Corporate

(7)

(3)

(12)

(5)

(17)

(16)

(35)

(32)

(23)

(19)

(46)

(37)

Thermal [Member]

(2)

(1)

(5)

(3)

417

Renewables

161

159

260

270

100

104

(49)

(36)

(89)

(78)

$ 51

$ 39

$ 5,855

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.

Related Party Transactions (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Dec. 31, 2016

$ 6

$ 3

^[1],[2]

$ 10

$ 5

^[1],[2]

Due to Affiliate, Noncurrent

$ 40

618

NRG [Member]

NRG RENOM [Member]

NRG Yield [Member] | NRG [Member]

NRG Yield [Member] | NRG [Member] | Scenario, Plan [Member]

Management Services Fee, Annual

Thermal [Member] | NRG [Member]

Due to Affiliate, Noncurrent

$ 22

NRG Energy Center Minneapolis LLC [Member] | NRG [Member]

Marsh Landing [Member] | GenOn Energy Services LLC [Member]

NRG DGPV Holdco 2 [Member] | NRG [Member]

Operations and Maintenance services [Member] | NRG [Member]

Operations and Maintenance services [Member] | Thermal [Member] | NRG [Member]

Operations and Maintenance services [Member] | Walnut Creek [Member] | NRG [Member]

Operations and Maintenance services [Member] | GCE Holding LLC [Member] | NRG [Member]

$ 2

$ 4

Condensed Income Statements, Captions [Line Items]

$ 2

$ 3

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidating Financial Information CP Income Statement (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Dec. 31, 2016

$ 284

$ 283

^[1],[2]

$ 502

$ 517

^[1],[2]

^[1],[2]

161

162

^[1],[2]

^[1],[2]

153

149

^[1],[2]

^[1],[2]

^[2]

162

155

^[1],[2]

326

316

^[1],[2]

122

128

^[1],[2]

176

201

^[1],[2]

^[1]

^[1],[2]

^[1],[2],[3]

^[1],[2]

^[1],[2]

155

136

^[1],[2]

(65)

(49)

^[1],[2]

(118)

(116)

^[1],[2]

Less: Net loss attributable to noncontrolling interests

^[1],[2]

^{[1],[2],[3],[4]}

(19)

(15)

^[1],[2]

(28)

(26)

^[1],[2]

^[1],[2]

111

^[1],[2]

Condensed Income Statements, Captions [Line Items]

Less: Net loss attributable to noncontrolling interests

Condensed Income Statements, Captions [Line Items]

279

278

^[1]

492

507

^[1]

^[1]

154

155

^[1]

^[1]

151

147

^[1]

^[1]

151

147

^[1]

305

302

^[1]

128

131

^[1]

187

205

^[1]

^[1]

^[1]

^[1]

^[1]

119

105

^[1]

(58)

(47)

^[1]

(96)

(103)

^[1]

Less: Net loss attributable to noncontrolling interests

^[1]

102

^[1],[4]

(1)

^[1]

(2)

^[1]

^[1]

102

^[1]

Condensed Income Statements, Captions [Line Items]

^[1]

^[1]

^[1]

^[1]

^[1]

^[1]

^[1]

111

^[1]

^[1]

^[1]

^[1]

^[1]

111

^[1]

Less: Net loss attributable to noncontrolling interests

^[1]

111

^[1]

^[1]

^[1]

111

^[1]

Condensed Income Statements, Captions [Line Items]

(7)

(3)

(12)

(5)

111

Less: Net loss attributable to noncontrolling interests

(19)

(15)

(28)

(26)

111

Condensed Income Statements, Captions [Line Items]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

(167)

^[5]

(208)

^[6]

(189)

^[5]

(239)

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

(167)

^[5]

(208)

^[6]

(189)

^[5]

(239)

^[6]

Less: Net loss attributable to noncontrolling interests

(167)

^[5]

(208)

^[6]

(189)

^[5]

(239)

^[6],[7]

^[5]

^[6]

^[5]

^[6]

5.00% Senior Notes due in 2026 [Member]

(168)

^[5]

$ (208)

^[6]

(191)

^[5]

$ (239)

^[6]

Condensed Income Statements, Captions [Line Items]

Senior Notes

$ 350

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Financial Information CP Comprehensive Income (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

$ 57

$ 79

^[1],[2]

$ 58

$ 85

^{[1],[2],[3],[4]}

(7)

(19)

^[3],[5]

(69)

^[3],[5]

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

(7)

(19)

^[3],[5]

(69)

^[3],[5]

^[3],[5]

Less: Comprehensive loss attributable to noncontrolling interests

(19)

(23)

^[3],[5]

(28)

(35)

^[3],[5]

^[3],[5]

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

Less: Comprehensive loss attributable to noncontrolling interests

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

^[1]

102

^[1],[3]

(6)

(18)

^[3]

(64)

^[3]

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

(6)

(18)

^[3]

(64)

^[3]

^[3]

Less: Comprehensive loss attributable to noncontrolling interests

(1)

^[3]

(2)

^[3]

^[3]

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

^[1]

111

^[1]

(7)

(11)

(60)

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

(7)

(11)

(60)

Less: Comprehensive loss attributable to noncontrolling interests

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

(7)

(19)

(69)

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

(7)

(19)

(69)

Less: Comprehensive loss attributable to noncontrolling interests

(19)

(23)

(28)

(35)

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

(167)

^[6]

(208)

^[7]

(189)

^[6]

(239)

^[7],[8]

^[6]

124

^[8]

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

^[6]

124

^[8]

(154)

^[6]

(180)

(189)

^[6]

(115)

^[8]

Less: Comprehensive loss attributable to noncontrolling interests

^[9]

^[8]

Condensed Balance Sheet Statements, Captions [Line Items]

$ (155)

^[9]

$ (180)

$ (191)

^[9]

$ (115)

^[8]

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[4]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.
[8]	(b) All significant intercompany transactions have been eliminated in consolidation.
[9]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Financial Information CP Balance Sheet (Details) - USD ($)

Jun. 30, 2017

Dec. 31, 2016

$ 179,000,000

$ 321,000,000

114,000,000

165,000,000

119,000,000

92,000,000

2,000,000

1,000,000

41,000,000

39,000,000

1,000,000

14,000,000

16,000,000

21,000,000

20,000,000

491,000,000

656,000,000

5,322,000,000

5,460,000,000

1,161,000,000

1,152,000,000

7,000,000

14,000,000

1,251,000,000

1,286,000,000

1,000,000

74,000,000

51,000,000

2,493,000,000

2,504,000,000

8,306,000,000

8,620,000,000

298,000,000

291,000,000

23,000,000

31,000,000

40,000,000

26,000,000

32,000,000

59,000,000

85,000,000

437,000,000

471,000,000

4,993,000,000

5,098,000,000

618,000,000

9,000,000

54,000,000

44,000,000

79,000,000

76,000,000

5,753,000,000

5,845,000,000

Commitments and Contingencies

6,190,000,000

6,316,000,000

1,807,000,000

1,995,000,000

101,000,000

79,000,000

291,000,000

313,000,000

Stockholders' Equity Attributable to Noncontrolling Interest

(83,000,000)

291,000,000

313,000,000

2,116,000,000

2,304,000,000

8,306,000,000

8,620,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

3,000,000

2,000,000

1,000,000

2,000,000

4,000,000

59,000,000

503,000,000

527,000,000

184,000,000

171,000,000

55,000,000

56,000,000

742,000,000

754,000,000

805,000,000

817,000,000

1,000,000

2,000,000

6,000,000

7,000,000

1,000,000

8,000,000

10,000,000

8,000,000

10,000,000

853,000,000

874,000,000

(54,000,000)

(65,000,000)

Stockholders' Equity Attributable to Noncontrolling Interest

(2,000,000)

797,000,000

807,000,000

805,000,000

817,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

97,000,000

110,000,000

114,000,000

165,000,000

116,000,000

90,000,000

1,000,000

40,000,000

37,000,000

1,000,000

14,000,000

16,000,000

21,000,000

19,000,000

403,000,000

440,000,000

5,263,000,000

5,401,000,000

607,000,000

600,000,000

7,000,000

14,000,000

1,196,000,000

1,230,000,000

73,000,000

50,000,000

1,883,000,000

1,895,000,000

7,549,000,000

7,736,000,000

298,000,000

291,000,000

22,000,000

18,000,000

14,000,000

15,000,000

26,000,000

32,000,000

33,000,000

60,000,000

393,000,000

416,000,000

4,153,000,000

4,259,000,000

9,000,000

54,000,000

44,000,000

79,000,000

76,000,000

4,295,000,000

4,388,000,000

4,688,000,000

4,804,000,000

2,824,000,000

2,920,000,000

63,000,000

35,000,000

Stockholders' Equity Attributable to Noncontrolling Interest

(87,000,000)

61,000,000

64,000,000

2,861,000,000

2,932,000,000

7,549,000,000

7,736,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

82,000,000

211,000,000

2,000,000

84,000,000

211,000,000

1,741,000,000

1,780,000,000

1,741,000,000

1,780,000,000

1,825,000,000

1,991,000,000

1,807,000,000

1,995,000,000

101,000,000

79,000,000

Stockholders' Equity Attributable to Noncontrolling Interest

(83,000,000)

1,825,000,000

1,991,000,000

1,825,000,000

1,991,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

1,000,000

1,000,000

3,155,000,000

3,212,000,000

370,000,000

381,000,000

1,000,000

3,526,000,000

3,594,000,000

3,526,000,000

3,595,000,000

3,000,000

11,000,000

18,000,000

25,000,000

24,000,000

36,000,000

45,000,000

840,000,000

839,000,000

618,000,000

1,458,000,000

1,457,000,000

1,494,000,000

1,502,000,000

1,980,000,000

1,971,000,000

(156,000,000)

(108,000,000)

Stockholders' Equity Attributable to Noncontrolling Interest

(83,000,000)

291,000,000

313,000,000

2,032,000,000

2,093,000,000

3,526,000,000

3,595,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[3]

^[1]

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

(5,657,000,000)

^[1]

(5,765,000,000)

^[2]

147,000,000

^[1]

138,000,000

^[2]

Stockholders' Equity Attributable to Noncontrolling Interest

172,000,000

^[1]

172,000,000

^[2]

(61,000,000)

^[1]

(64,000,000)

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

Condensed Cash Flow Statements, Captions [Line Items]

$ (5,399,000,000)

^[1]

$ (5,519,000,000)

^[2]

[1]	(a) All significant intercompany transactions have been eliminated in consolidation.
[2]	(a) All significant intercompany transactions have been eliminated in consolidation.
[3]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Financial Information CP Cash Flows (Details) - USD ($)
$ in Millions

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Net Cash Provided by (Used in) Operating Activities

$ 172

$ 219

^[1],[2]

Intercompany transactions between Yield LLC and subsidiaries

^[1]

131

^[2]

(13)

(11)

^[1],[2]

Return of investment from unconsolidated affiliates

^[1],[2]

^[1],[2]

(33)

(59)

^[1],[2]

Transfer of funds under intercompany cash management arrangement

(143)

(41)

^[1],[2]

^[1]

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

^[1]

(42)

(15)

^[1],[2]

^[2]

Proceeds from the issuance of long-term debt — external

104

^[1]

^[2]

Net Cash (Used in) Provided by Financing Activities

(222)

(206)

^[1],[2]

Net Decrease in Cash, Cash Equivalents and Restricted Cash

(193)

(28)

^[1],[2]

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

486

241

^[1],[2]

Cash, Cash Equivalents and Restricted Cash at End of Period

293

213

^[1],[2]

Condensed Cash Flow Statements, Captions [Line Items]

Net Cash Provided by (Used in) Operating Activities

Intercompany transactions between Yield LLC and subsidiaries

Return of investment from unconsolidated affiliates

(26)

(44)

Transfer of funds under intercompany cash management arrangement

(21)

(43)

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

Proceeds from the issuance of long-term debt — external

Net Cash (Used in) Provided by Financing Activities

Net Decrease in Cash, Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

Cash, Cash Equivalents and Restricted Cash at End of Period

Condensed Cash Flow Statements, Captions [Line Items]

Net Cash Provided by (Used in) Operating Activities

152

195

^[1]

Intercompany transactions between Yield LLC and subsidiaries

^[1]

(13)

(11)

^[1]

Return of investment from unconsolidated affiliates

^[1]

(11)

^[1]

(7)

^[1]

Transfer of funds under intercompany cash management arrangement

(5)

(13)

^[1]

^[1]

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

^[1]

(42)

(15)

^[1]

Proceeds from the issuance of long-term debt — external

^[1]

Net Cash (Used in) Provided by Financing Activities

(211)

(209)

^[1]

Net Decrease in Cash, Cash Equivalents and Restricted Cash

(64)

(27)

^[1]

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

275

226

^[1]

Cash, Cash Equivalents and Restricted Cash at End of Period

211

199

^[1]

Condensed Cash Flow Statements, Captions [Line Items]

Net Cash Provided by (Used in) Operating Activities

^[1]

Intercompany transactions between Yield LLC and subsidiaries

(40)

^[1]

^[1]

Return of investment from unconsolidated affiliates

^[1]

^[1]

^[1]

Transfer of funds under intercompany cash management arrangement

(40)

^[1]

(6)

^[1]

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

^[1]

^[1]

Proceeds from the issuance of long-term debt — external

^[1]

Net Cash (Used in) Provided by Financing Activities

(89)

(34)

^[1]

Net Decrease in Cash, Cash Equivalents and Restricted Cash

(129)

(1)

^[1]

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

211

^[1]

Cash, Cash Equivalents and Restricted Cash at End of Period

^[1]

Condensed Cash Flow Statements, Captions [Line Items]

Net Cash Provided by (Used in) Operating Activities

(1)

(17)

Intercompany transactions between Yield LLC and subsidiaries

(33)

131

Return of investment from unconsolidated affiliates

(15)

Transfer of funds under intercompany cash management arrangement

(77)

(18)

(51)

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

Proceeds from the issuance of long-term debt — external

(59)

(66)

Net Cash (Used in) Provided by Financing Activities

Net Decrease in Cash, Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

Cash, Cash Equivalents and Restricted Cash at End of Period

$ 0

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidating Financial Information PP Income Statement (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Condensed Income Statements, Captions [Line Items]

$ 284

$ 283

^[1],[2]

$ 502

$ 517

^[1],[2]

^[1],[2]

161

162

^[1],[2]

^[1],[2]

153

149

^[1],[2]

^[1],[2]

^[2]

162

155

^[1],[2]

326

316

^[1],[2]

122

128

^[1],[2]

176

201

^[1],[2]

^[1]

^[1],[2]

^[1],[2],[3]

^[1],[2]

^[1],[2]

155

136

^[1],[2]

(65)

(49)

^[1],[2]

(118)

(116)

^[1],[2]

Less: Net loss attributable to noncontrolling interests

^[1],[2]

^{[1],[2],[3],[4]}

(19)

(15)

^[1],[2]

(28)

(26)

^[1],[2]

^[1],[2]

111

^[1],[2]

Condensed Income Statements, Captions [Line Items]

Less: Net loss attributable to noncontrolling interests

Condensed Income Statements, Captions [Line Items]

279

278

^[1]

492

507

^[1]

^[1]

154

155

^[1]

^[1]

151

147

^[1]

^[1]

151

147

^[1]

305

302

^[1]

128

131

^[1]

187

205

^[1]

^[1]

^[1]

^[1]

^[1]

119

105

^[1]

(58)

(47)

^[1]

(96)

(103)

^[1]

Less: Net loss attributable to noncontrolling interests

^[1]

102

^[1],[4]

(1)

^[1]

(2)

^[1]

^[1]

102

^[1]

Condensed Income Statements, Captions [Line Items]

^[1]

^[1]

^[1]

^[1]

^[1]

^[1]

^[1]

111

^[1]

^[1]

^[1]

^[1]

^[1]

111

^[1]

Less: Net loss attributable to noncontrolling interests

^[1]

111

^[1]

^[1]

^[1]

111

^[1]

Condensed Income Statements, Captions [Line Items]

(7)

(3)

(12)

(5)

111

Less: Net loss attributable to noncontrolling interests

(19)

(15)

(28)

(26)

111

Condensed Income Statements, Captions [Line Items]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

(1)

^[5]

^[6]

(1)

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

(167)

^[5]

(208)

^[6]

(189)

^[5]

(239)

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

^[5]

^[6]

(167)

^[5]

(208)

^[6]

(189)

^[5]

(239)

^[6]

Less: Net loss attributable to noncontrolling interests

(167)

^[5]

(208)

^[6]

(189)

^[5]

(239)

^[6],[7]

^[5]

^[6]

^[5]

^[6]

Condensed Statement of Income Captions [Line Items]

$ (168)

^[5]

$ (208)

^[6]

$ (191)

^[5]

$ (239)

^[6]

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Financial Information PP Comprehensive Income (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Jun. 30, 2017

Jun. 30, 2016

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

$ 57

$ 79

^[1],[2]

$ 58

$ 85

^{[1],[2],[3],[4]}

(7)

(19)

^[3],[5]

(69)

^[3],[5]

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

(7)

(19)

^[3],[5]

(69)

^[3],[5]

^[3],[5]

Less: Comprehensive loss attributable to noncontrolling interests

(19)

(23)

^[3],[5]

(28)

(35)

^[3],[5]

^[3],[5]

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

Less: Comprehensive loss attributable to noncontrolling interests

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

^[1]

102

^[1],[3]

(6)

(18)

^[3]

(64)

^[3]

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

(6)

(18)

^[3]

(64)

^[3]

^[3]

Less: Comprehensive loss attributable to noncontrolling interests

(1)

^[3]

(2)

^[3]

^[3]

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

^[1]

111

^[1]

(7)

(11)

(60)

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

(7)

(11)

(60)

Less: Comprehensive loss attributable to noncontrolling interests

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

(7)

(19)

(69)

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

(7)

(19)

(69)

Less: Comprehensive loss attributable to noncontrolling interests

(19)

(23)

(28)

(35)

Condensed Statement of Income Captions [Line Items]

Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax

(167)

^[6]

(208)

^[7]

(189)

^[6]

(239)

^[7],[8]

^[6]

124

^[8]

Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest

^[6]

124

^[8]

(154)

^[6]

(180)

(189)

^[6]

(115)

^[8]

Less: Comprehensive loss attributable to noncontrolling interests

^[9]

^[8]

Condensed Balance Sheet Statements, Captions [Line Items]

$ (155)

^[9]

$ (180)

$ (191)

^[9]

$ (115)

^[8]

[1]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[2]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted to reflect the effects of the March 2017 Drop Down Assets acquisition and the CVSR Drop Down, as further discussed in Note 1, Nature of Business.
[4]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.
[8]	(b) All significant intercompany transactions have been eliminated in consolidation.
[9]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Financial Information PP Balance Sheet (Details) - USD ($)

Jun. 30, 2017

Dec. 31, 2016

$ 179,000,000

$ 321,000,000

114,000,000

165,000,000

119,000,000

92,000,000

2,000,000

1,000,000

41,000,000

39,000,000

14,000,000

16,000,000

21,000,000

20,000,000

491,000,000

656,000,000

5,322,000,000

5,460,000,000

1,161,000,000

1,152,000,000

7,000,000

14,000,000

1,251,000,000

1,286,000,000

1,000,000

74,000,000

51,000,000

2,493,000,000

2,504,000,000

8,306,000,000

8,620,000,000

298,000,000

291,000,000

23,000,000

31,000,000

40,000,000

26,000,000

32,000,000

59,000,000

85,000,000

437,000,000

471,000,000

4,993,000,000

5,098,000,000

618,000,000

9,000,000

54,000,000

44,000,000

79,000,000

76,000,000

5,753,000,000

5,845,000,000

Commitments and Contingencies

6,190,000,000

6,316,000,000

1,807,000,000

1,995,000,000

101,000,000

79,000,000

(83,000,000)

291,000,000

313,000,000

2,116,000,000

2,304,000,000

8,306,000,000

8,620,000,000

2,000,000

1,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

3,000,000

2,000,000

1,000,000

2,000,000

4,000,000

59,000,000

503,000,000

527,000,000

184,000,000

171,000,000

55,000,000

56,000,000

742,000,000

754,000,000

805,000,000

817,000,000

1,000,000

2,000,000

6,000,000

7,000,000

1,000,000

8,000,000

10,000,000

8,000,000

10,000,000

853,000,000

874,000,000

(54,000,000)

(65,000,000)

(2,000,000)

797,000,000

807,000,000

805,000,000

817,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

97,000,000

110,000,000

114,000,000

165,000,000

116,000,000

90,000,000

1,000,000

40,000,000

37,000,000

14,000,000

16,000,000

21,000,000

19,000,000

403,000,000

440,000,000

5,263,000,000

5,401,000,000

607,000,000

600,000,000

7,000,000

14,000,000

1,196,000,000

1,230,000,000

1,000,000

73,000,000

50,000,000

1,883,000,000

1,895,000,000

7,549,000,000

7,736,000,000

298,000,000

291,000,000

22,000,000

18,000,000

14,000,000

15,000,000

26,000,000

32,000,000

33,000,000

60,000,000

393,000,000

416,000,000

4,153,000,000

4,259,000,000

9,000,000

54,000,000

44,000,000

79,000,000

76,000,000

4,295,000,000

4,388,000,000

4,688,000,000

4,804,000,000

2,824,000,000

2,920,000,000

63,000,000

35,000,000

(87,000,000)

61,000,000

64,000,000

2,861,000,000

2,932,000,000

7,549,000,000

7,736,000,000

2,000,000

1,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

82,000,000

211,000,000

2,000,000

84,000,000

211,000,000

1,741,000,000

1,780,000,000

1,741,000,000

1,780,000,000

1,825,000,000

1,991,000,000

1,807,000,000

1,995,000,000

101,000,000

79,000,000

(83,000,000)

1,825,000,000

1,991,000,000

1,825,000,000

1,991,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

1,000,000

1,000,000

3,155,000,000

3,212,000,000

370,000,000

381,000,000

1,000,000

3,526,000,000

3,594,000,000

3,526,000,000

3,595,000,000

3,000,000

11,000,000

18,000,000

25,000,000

24,000,000

36,000,000

45,000,000

840,000,000

839,000,000

618,000,000

1,458,000,000

1,457,000,000

1,494,000,000

1,502,000,000

1,980,000,000

1,971,000,000

(156,000,000)

(108,000,000)

(83,000,000)

291,000,000

313,000,000

2,032,000,000

2,093,000,000

3,526,000,000

3,595,000,000

Condensed Balance Sheet Statements, Captions [Line Items]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[2]

^[1]

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

^[1]

^[2]

(5,657,000,000)

^[1]

(5,765,000,000)

^[2]

147,000,000

^[1]

138,000,000

^[2]

172,000,000

^[1]

172,000,000

^[2]

(61,000,000)

^[1]

(64,000,000)

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

(5,399,000,000)

^[1]

(5,519,000,000)

^[2]

^[2]

$ 0

Condensed Cash Flow Statements, Captions [Line Items]

^[1]

$ 0

[1]	(a) All significant intercompany transactions have been eliminated in consolidation.
[2]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Financial Information PP Cash Flows (Details) - USD ($)
$ in Millions

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

Net Cash Provided by (Used in) Operating Activities

$ 172

$ 219

^[1],[2]

^[1],[2]

Intercompany transactions between Yield LLC and subsidiaries

^[1]

^[1]

(13)

(11)

^[1],[2]

Return of investment from unconsolidated affiliates

^[1],[2]

^[1],[2]

(33)

(59)

^[1],[2]

(2)

^[1],[2]

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

(143)

(41)

^[1],[2]

(42)

(15)

^[1],[2]

Transfer of funds under intercompany cash management arrangement

^[2]

^[1]

Payments of distributions

(104)

(89)

^[2]

Proceeds from the issuance of long-term debt — external

^[2]

(4)

^[2]

^[1],[2]

Net Cash (Used in) Provided by Financing Activities

(142)

(122)

^[1],[2]

(222)

(206)

^[1],[2]

Net Decrease in Cash, Cash Equivalents and Restricted Cash

(193)

(28)

^[1],[2]

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

486

241

^[1],[2]

Cash, Cash Equivalents and Restricted Cash at End of Period

293

213

^[1],[2]

Condensed Cash Flow Statements, Captions [Line Items]

Net Cash Provided by (Used in) Operating Activities

Intercompany transactions between Yield LLC and subsidiaries

Return of investment from unconsolidated affiliates

(26)

(44)

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

(21)

(43)

Transfer of funds under intercompany cash management arrangement

Proceeds from the issuance of long-term debt — external

Net Cash (Used in) Provided by Financing Activities

Net Decrease in Cash, Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

Cash, Cash Equivalents and Restricted Cash at End of Period

Condensed Cash Flow Statements, Captions [Line Items]

Net Cash Provided by (Used in) Operating Activities

152

195

^[1]

^[1]

Intercompany transactions between Yield LLC and subsidiaries

^[1]

^[1]

(13)

(11)

^[1]

Return of investment from unconsolidated affiliates

^[1]

(11)

^[1]

(7)

^[1]

^[1]

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

(5)

(13)

^[1]

(42)

(15)

^[1]

Transfer of funds under intercompany cash management arrangement

^[1]

Proceeds from the issuance of long-term debt — external

(4)

^[1]

Net Cash (Used in) Provided by Financing Activities

(142)

(122)

^[1]

(211)

(209)

^[1]

Net Decrease in Cash, Cash Equivalents and Restricted Cash

(64)

(27)

^[1]

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

275

226

^[1]

Cash, Cash Equivalents and Restricted Cash at End of Period

211

199

^[1]

Condensed Cash Flow Statements, Captions [Line Items]

Net Cash Provided by (Used in) Operating Activities

^[1]

^[1]

Intercompany transactions between Yield LLC and subsidiaries

^[1]

(40)

^[1]

^[1]

Return of investment from unconsolidated affiliates

^[1]

^[1]

^[1]

^[1]

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

(40)

^[1]

^[1]

Transfer of funds under intercompany cash management arrangement

(6)

^[1]

Proceeds from the issuance of long-term debt — external

^[1]

Net Cash (Used in) Provided by Financing Activities

^[1]

(89)

(34)

^[1]

Net Decrease in Cash, Cash Equivalents and Restricted Cash

(129)

(1)

^[1]

Cash, Cash Equivalents and Restricted Cash at Beginning of Period

211

^[1]

Cash, Cash Equivalents and Restricted Cash at End of Period

^[1]

Condensed Cash Flow Statements, Captions [Line Items]

Net Cash Provided by (Used in) Operating Activities

(1)

(17)

Intercompany transactions between Yield LLC and subsidiaries

(33)

Return of investment from unconsolidated affiliates

(15)

(2)

Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets

(77)

(18)

Transfer of funds under intercompany cash management arrangement

(51)

Proceeds from the issuance of long-term debt — external