Clearway Energy (CWEN) 10-Q 5 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014	Oct. 31, 2014
		Common Class A	Common Class B
Document And Entity Information [Abstract]	'	'	'
Entity Registrant Name	'NRG Yield, Inc.	'	'
Entity Central Index Key	'0001567683	'	'
Document Type	'10-Q	'	'
Document Period End Date	30-Sep-14	'	'
Amendment Flag	'false	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Non-accelerated Filer	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'Q3	'	'
Class of Stock [Line Items]	'	'	'
Entity Common Stock, Shares Outstanding	'	34,586,250	42,738,750

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended				9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Operating Revenues	'		'		'		'
Total operating revenues	$161		$126	[1]	$435		$261	[1]
Operating Costs and Expenses	'		'		'		'
Cost of operations	52		44	[1]	157		105	[1]
Depreciation and amortization	34		18	[1]	94		38	[1]
General and administrative b affiliate	3		1	[1]	7		5	[1]
Business Combination, Acquisition Related Costs	2		0		2		0
Total operating costs and expenses	91		63		260		148	[1]
Operating Income	70		63		175		113	[1]
Other Income (Expense)	'		'		'		'
Equity in earnings of unconsolidated affiliates	11		12	[1]	26		18	[1]
Other income, net	1		0	[1]	2		1	[1]
Interest expense	-41		-21	[1]	-97		-32	[1]
Total other expense	-29		-9		-69		-13	[1]
Income (loss) before income taxes	41		54		106		100	[1]
Income tax expense	10		5	[1]	15		5	[1]
Net Income	31		49	[1]	91		95	[1]
Less: Pre-acquisition net income of Acquired ROFO Assets	0		9	[1]	17		10	[1]
Net Income Subsequent to Initial Public Offering and Excluding Pre-acquisition Net Income of Acquired ROFO Assets	31		31	[1]	74		31	[1]
Income attributable to NRG (b)	25	[2]	22	[1],[2]	58	[2]	22	[1],[2]
Net Income Attributable to NRG Yield, Inc.	6		9	[1]	16		9	[1]
Basic and Diluted Earnings per Share Attributable to Class A Common Stockholders	'		'		'		'
Weighted average number of Class A common shares outstanding	31		0		25		0
Basic and Diluted Earnings per Class A Common Share	$0.20		$0.39		$0.62		$0.39
Dividends per Class A Common Share	$0.37		$0		$1.04		$0
Predecessor [Member]	'		'		'		'
Other Income (Expense)	'		'		'		'
Net Income	$0		$9	[1]	$0	[1]	$54	[1]
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	The calculation of income attributable to NRG excludes pre-acquisition net income of the Acquired ROFO Assets.

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Net Income (Loss)	$31	$49	[1]	$91		$95	[1]
Other Comprehensive Income (Loss), net of tax	'	'		'		'
Other comprehensive income (loss)	7	5	[1]	-17		34	[1]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	7	5		-17		34
Comprehensive Income	38	54	[1]	74		129	[1]
Less: Pre-acquisition net income of Acquired ROFO Assets	0	9	[1]	17		10	[1]
Less: Comprehensive income attributable to NRG	30	28		48		38
Comprehensive Income Attributable to NRG Yield, Inc.	8	8	[1]	9		8
Predecessor [Member]	'	'		'		'
Net Income (Loss)	0	9	[1]	0	[1]	54	[1]
Other Comprehensive Income (Loss), net of tax	'	'		'		'
Comprehensive Income	$0	$9		$0		$73
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Unrealized gain/loss on derivatives, income tax expense /(benefit)	$0	$13	$0	$15

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$372	$59	[1]
Restricted cash	54	67	[1]
Accounts receivable b trade	80	51	[1]
Accounts receivable b affiliate	4	5	[1]
Inventory	17	15	[1]
Derivative instruments	0	1	[1]
Notes receivable	6	6	[1]
Renewable energy grant receivable	0	147	[1]
Prepayments and other current assets	22	27	[1]
Total current assets	555	378	[1]
In service	3,535	2,459	[1]
Under construction	7	6	[1]
Total property, plant and equipment	3,542	2,465	[1]
Less accumulated depreciation	266	174	[1]
Net property, plant and equipment	3,276	2,291	[1]
Other Assets	'	'
Equity investments in affiliates	230	227	[1]
Intangible assets, net of accumulated amortization of $17 and $6	1,517	103	[1]
Derivative instruments	7	20	[1]
Deferred income taxes	204	146	[1]
Other non-current assets	93	50	[1]
Total other assets	2,068	569	[1]
Total Assets	5,899	3,238	[1]
Current Liabilities	'	'
Current portion of long-term debt	157	214	[1]
Derivative instruments	30	31	[1]
Accrued expenses and other current liabilities	52	30	[1]
Total current liabilities	302	369	[1]
Other Liabilities	'	'
Long-term debt	3,926	1,569	[1]
Deferred Tax Liabilities, Net, Noncurrent	5	5	[1]
Derivative instruments	23	16	[1]
Other non-current liabilities	29	27	[1]
Total non-current liabilities	3,983	1,617	[1]
Total Liabilities	4,285	1,986	[1]
Commitments and Contingencies	'	'
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued	0	0	[1]
Stockholders' Equity	'	'
Additional paid-in capital	1,336	621	[1]
Retained earnings	5	8	[1]
Accumulated other comprehensive loss	-6	0	[1]
Noncontrolling interest	279	623	[1]
Total Stockholders' Equity	1,614	1,252	[1]
Total Liabilities and Stockholdersb Equity	5,899	3,238	[1]
Non-affiliate	'	'
Other Assets	'	'
Notes receivable	0	2	[1]
Current Liabilities	'	'
Accounts payable	15	42	[1]
Affiliate	'	'
Other Assets	'	'
Notes receivable	17	21	[1]
Current Liabilities	'	'
Accounts payable	48	52	[1]
Common Class A	'	'
Other Liabilities	'	'
Class A common stock, $0.01 par value; 500,000,000 shares authorized; 34,586,250 shares issued Class B common stock, $0.01 par value; 500,000,000 shares authorized; 42,738,750 shares issued	$0	$0	[1]
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Property, plant and equipment, accumulated depreciation	$266	$174	[1]
Intangible assets, accumulated amortization	$17	$6
Common Class A	'	'
Common Stock, Par Value Per Share	$0.01	$0.01
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	34,586,250	22,511,250
Common Class B	'	'
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	42,738,750	42,738,750
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
					Affiliate	Affiliate		Non-affiliate	Non-affiliate
Cash Flows from Operating Activities	'		'		'	'		'	'
Net Income (Loss)	$91		$95	[1]	'	'		'	'
Adjustments to reconcile net income to net cash provided by (used in) operating activities:	'		'		'	'		'	'
Distributions and equity in earnings of unconsolidated affiliates	17		-10	[1]	'	'		'	'
Depreciation and amortization	94		38	[1]	'	'		'	'
Amortization of financing costs and debt discount/premium	8		1	[1]	'	'		'	'
Amortization of intangibles and out-of-market contracts	8		2	[1]	'	'		'	'
Changes in deferred income taxes	15		5	[1]	'	'		'	'
Changes in derivative instruments	-5		-14	[1]	'	'		'	'
Changes in other working capital	-34		-27	[1]	'	'		'	'
Net Cash Provided by Operating Activities	194		90	[1]	'	'		'	'
Cash Flows from Investing Activities	'		'		'	'		'	'
Payments to Acquire Businesses, Net of Cash Acquired	-901		0		'	'		'	'
Payment to NRG for Acquired ROFO Assets	-357		0	[1]	'	'		'	'
Capital expenditures	-28		-339	[1]	'	'		'	'
Decrease (increase) in restricted cash	28		-88	[1]	'	'		'	'
Decrease in notes receivable, including affiliates	6		4	[1]	'	'		'	'
Proceeds from renewable energy grants	137		24	[1]	'	'		'	'
Investments in unconsolidated affiliates	-17		-19	[1]	'	'		'	'
Other	11		0	[1]	'	'		'	'
Net Cash Used in Investing Activities	-1,121		-418	[1]	'	'		'	'
Cash Flows from Financing Activities	'		'		'	'		'	'
Capital contributions from NRG	'		'		2	150	[1]	'	'
Return of capital to NRG	'		'		-23	0	[1]	'	'
Payment of dividends and distributions	-72		-707	[1]	'	'		'	'
Proceeds from issuance of long-term debt b external	924		558	[1]	'	'		'	'
Payment of debt issuance costs	-26		-5	[1]	'	'		'	'
Payment of borrowings from affiliate	0		-2	[1]	'	'		'	'
Payments for long-term debt b external	'		'		'	'		-195	-35	[1]
Net Cash Provided by Financing Activities	1,240		427	[1]	'	'		'	'
Net Increase in Cash and Cash Equivalents	313		99	[1]	'	'		'	'
Cash and Cash Equivalents at Beginning of Period	59	[1]	22	[1]	'	'		'	'
Cash and Cash Equivalents at End of Period	$372		$121	[1]	'	'		'	'
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Nature_of_Business_Notes

Nature of Business (Notes)	9 Months Ended
	Sep. 30, 2014
Nature of Business Disclosure [Abstract]	'
Nature of Business	'
	Nature of Business
	NRG Yield, Inc., or the Company, was formed by NRG as a Delaware corporation on December 20, 2012. On July 22, 2013, the Company issued 22,511,250 shares of Class A common stock in an initial public offering. The Company utilized the net proceeds of the initial public offering to acquire 19,011,250 Class A units of NRG Yield LLC from NRG, in return for $395 million and 3,500,000 Class A units of NRG Yield LLC directly from NRG Yield LLC in return for $73 million.  In connection with the acquisition of the Class A units, the Company also became the sole managing member of NRG Yield LLC, thereby acquiring a controlling interest in NRG Yield LLC.
	Immediately prior to the acquisition, NRG Yield LLC acquired a portfolio of contracted renewable and conventional generation and thermal infrastructure assets, primarily located in the Northeast, Southwest and California regions of the United States, from NRG in return for Class B units in NRG Yield LLC.  These assets were simultaneously contributed by NRG Yield LLC to its direct wholly owned subsidiary NRG Yield Operating LLC at their historical cost in accordance with ASC 805-50, Business Combinations - Related Issues.
	As of June 30, 2014, the Company and NRG owned 34.5% and 65.5% of NRG Yield LLC, respectively. On July 29, 2014, the Company issued 12,075,000 shares of Class A common stock for net proceeds, after underwriting discount and expenses, of $630 million. The Company utilized the proceeds of the offering to acquire 12,075,000 additional Class A units of NRG Yield LLC and, as a result, as of September 30, 2014, the Company owns 44.7% of NRG Yield LLC, and consolidates the results of NRG Yield LLC through its controlling interest, with NRG's 55.3% interest shown as noncontrolling interest in the financial statements.
	The following table represents the structure of the Company as of September 30, 2014:
	For the period prior to the initial public offering, the accompanying unaudited combined financial statements represent the combination of the assets that NRG Yield LLC acquired and were prepared using NRG's historical basis in the assets and liabilities. For the purposes of the unaudited combined financial statements, the term "NRG Yield" represents the accounting predecessor, or the combination of the acquired businesses. For all periods subsequent to the initial public offering, the accompanying unaudited consolidated financial statements represent the consolidated results of the Company, which consolidates NRG Yield LLC through its controlling interest.
	As of September 30, 2014, the Company's operating assets are comprised of the following projects:
	Projects	Percentage Ownership		Net Capacity (MW) (a)	Offtake Counterparty	Expiration
	Conventional
	GenConn Middletown	49.95	%	95	Connecticut Light & Power	2041
	GenConn Devon	49.95	%	95	Connecticut Light & Power	2040
	Marsh Landing	100	%	720	Pacific Gas and Electric	2023
	El Segundo	100	%	550	Southern California Edison	2023
				1,460
	Utility-Scale Solar
	Alpine	100	%	66	Pacific Gas and Electric	2033
	Avenal	49.95	%	23	Pacific Gas and Electric	2031
	Avra Valley	100	%	25	Tucson Electric Power	2032
	Blythe	100	%	21	Southern California Edison	2029
	Borrego	100	%	26	San Diego Gas and Electric	2038
	CVSR	48.95	%	122	Pacific Gas and Electric	2038
	Roadrunner	100	%	20	El Paso Electric	2031
	RE Kansas South	100	%	20	Pacific Gas and Electric	2033
	TA High Desert	100	%	20	Southern California Edison	2033
				343
	Distributed Solar
	AZ DG Solar Projects	100	%	5	Various	2025 - 2033
	PFMG DG Solar Projects	51	%	5	Various	2032
				10
	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	100	%	137	Southern California Edison	2038(c)
	Alta XI	100	%	90	Southern California Edison	2038(c)
	South Trent	100	%	101	AEP Energy Partners	2029
				1,048
	Thermal
	Thermal equivalent MWt(b)	100	%	1,346	Various	Various
	Thermal generation	100	%	123	Various	Various
	Total net capacity (excluding equivalent MWt)			2,984
	(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 September 30, 2014.
	(b) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 118 MWt which is available under the right-to-use provisions contained in agreements between two of NRG Yield Inc.'s thermal facilities and certain of their customers.
	(c) PPA begins on January 1, 2016.
	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. Three of the district energy systems are subject to rate regulation by state public utility commissions while the other district energy systems have rates determined by negotiated bilateral contracts.
	The historical combined financial statements include allocations of certain NRG corporate expenses. Management believes the assumptions and methodology underlying the allocation of general corporate overhead expenses are reasonable. The allocated costs include legal, accounting, tax, treasury, information technology, insurance, employee benefit costs, and other corporate costs. However, such expenses may not be indicative of the actual level of expense that would have been incurred if the Company had operated as an independent, publicly-traded company during the periods prior to the initial public offering or of the costs expected to be incurred in the future. Allocation of NRG corporate expenses was $4 million for the period beginning on January 1, 2013 and ending on July 22, 2013. In connection with the initial public offering, the Company entered into a management services agreement with NRG for various services, including human resources, accounting, tax, legal, information systems, treasury, and risk management. Costs incurred by the Company under this agreement were $1 million for the period beginning July 23, 2013 and ending September 30, 2013 and $7 million for the nine months ended September 30, 2014.
	For all periods prior to the initial public offering, member's equity represents the combined equity of the Company's subsidiaries, including adjustments necessary to present the Company's financial statements as if the Company were in existence as of the beginning of the periods presented. Member's equity represents NRG's equity in the subsidiaries, and accordingly, in connection with the initial public offering, the historical equity balance as of that date was reclassified into noncontrolling interest. Subsequent to the initial public offering, stockholders' equity represents the equity associated with the Class A common stockholders, with the equity associated with the Class B common stockholders, or NRG, classified as noncontrolling interest.
	As described in Note 3, Business Acquisitions, on June 30, 2014, NRG Yield Operating LLC acquired the TA High Desert, RE Kansas South, and El Segundo projects from NRG for total cash consideration of $357 million plus assumed project level debt. The acquisition of the TA High Desert, RE Kansas South, and El Segundo projects from NRG on June 30, 2014 was accounted for as a transfer of entities 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. Accordingly, the Company prepared its consolidated financial statements to reflect the transfer as if it had taken place on January 1, 2013, or from the date the entities were under common control, which was May 13, 2013 for RE Kansas South and March 28, 2013 for TA High Desert, which represent the dates these entities were acquired by NRG. Member's equity represents NRG's equity in the subsidiaries, and accordingly, in connection with the acquisition by the Company, the balance was reclassified into noncontrolling interest.
	The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the Securities and Exchange Commission’s, or SEC’s, regulations for interim financial information. Accordingly, they do not include all of the information and notes required by U.S. 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 Company’s consolidated financial statements in the 2013 Form 10-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 September 30, 2014, and the results of operations, comprehensive income and cash flows for the nine months ended September 30, 2014, and 2013.

Summary_of_Significant_Account

Summary of Significant Accounting Policies (Notes)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies [Text Block]	'
	Summary of Significant Accounting Policies
	Use of Estimates
	The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amount of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements. They also impact the reported amount of net earnings during the reporting period. Actual results could be different from these estimates.
	Noncontrolling Interest
	The following table reflects the changes in the Company's noncontrolling interest balance:
		(In millions)
	Balance as of December 31, 2013 (As previously reported)	$	382
	Net Assets of Acquired ROFO Assets as of December 31, 2013	241
	Balance as of December 31, 2013 (As currently reported)	623
	Payment to NRG for Acquired ROFO assets	(357		)
	Comprehensive income, including pre-acquisition net income from Acquired ROFO Assets	65
	Non-cash contributions	13
	Cash distributions, net of cash contributions	(65		)
	Balance as of September 30, 2014	$	279
	Distributions
	On January 30, 2014, NRG Yield LLC declared a distribution on its units of $0.33 per unit, which was paid on March 17, 2014. On May 5, 2014, NRG Yield LLC declared a distribution on its units of $0.35 per unit, which was paid on June 16, 2014. On July 29, 2014, NRG Yield LLC declared a distribution on its units of $0.365 per unit, which was paid on September 15, 2014. The portion of the distributions paid by NRG Yield LLC to NRG was recorded as a reduction to the Company's noncontrolling interest balance.
	On June 30, 2014, the Company acquired the TA High Desert, RE Kansas South, and El Segundo projects, as discussed in Note 3, Business Acquisitions. The difference between the cash paid and historical value of the entities' equity of $113 million was recorded as a distribution to NRG and reduced the balance of its noncontrolling interest. In addition, as the TA High Desert, RE Kansas South and El Segundo projects were owned by NRG until June 30, 2014, the pre-acquisition earnings of such projects are recorded as attributable to NRG's noncontrolling interest. Prior to the date of acquisition, El Segundo made a distribution to NRG of $24 million.
	Recent Accounting Developments
	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. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 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 the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position.
	ASU 2013-11 - In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740) Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, or ASU No. 2013-11.  The amendments of ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction of a deferred tax asset for an NOL, a similar tax loss or tax credit carryforwards rather than a liability when the tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and the entity intends to use the deferred tax asset for that purpose.  The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 with early adoption permitted. The Company adopted this standard effective January 1, 2014. The adoption of this standard did not impact the Company's results of operations or cash flows as the Company has no uncertain tax benefits as of September 30, 2014.

Business_Acquisition_Notes

Business Acquisition (Notes)	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Business Acquisition	'
	Business Acquisitions
	2014 Acquisitions
	Acquisition of EME-NYLD-Eligible Assets from NRG
	On November 4, 2014, the Company and NRG entered into a definitive agreement regarding the acquisition of the following NRG facilities: (i) Walnut Creek, (ii) Tapestry (Pinnacle, Buffalo Bear and Taloga) and (iii) Laredo Ridge for total expected cash consideration of $480 million plus assumed project level debt and working capital adjustments to be calculated at close. The sale is subject to customary closing conditions and is expected to close by the end of the fourth quarter of 2014. The Company expects to fund the acquisition with cash on hand and drawings under the Company's revolving credit facility.
	Alta Wind Portfolio Acquisition — On August 12, 2014, the Company acquired 100% of the membership interests of Alta Wind Asset Management Holdings, LLC, Alta Wind Company, LLC, Alta Wind X Holding Company, LLC and Alta Wind XI Holding Company, LLC, which collectively own 7 wind facilities that total 947 MW located in Tehachapi, California and a portfolio of associated land leases, or the Alta Wind Assets. Power generated by the Alta Wind Assets is sold to Southern California Edison under long-term PPAs with 21 years of remaining contract life for Alta I-V and 22 years, beginning in 2016, for Alta X and XI.
	The purchase price for the Alta Wind Assets was $923 million, which consisted of a base purchase price of $870 million, as well as a payment for working capital of $53 million, plus the assumption of $1.6 billion of non-recourse project-level debt. In order to fund the purchase price, the Company completed an equity offering of 12,075,000 shares of its Class A common stock at an offering price of $54.00 per share on July 29, 2014, which resulted in net proceeds of $630 million, after underwriting discounts and expenses. In addition, on August 5, 2014, NRG Yield Operating LLC issued $500 million of Senior Notes, which bear interest at a rate of 5.375% and mature in August 2024. Interest on the Senior Notes is payable semi-annually on February 15 and August 15, commencing on February 15, 2015. The excess of the equity proceeds over the amount utilized for the acquisition is available for general corporate purposes, including future acquisitions.
	The acquisition was recorded as a business combination under ASC 805, with identifiable assets acquired and liabilities assumed provisionally recorded at their estimated fair values on the acquisition date. The initial accounting for the business combination is not complete because the evaluation necessary to assess the fair values of certain net assets acquired is still in process. The provisional amounts are subject to revision until the evaluations are completed to the extent that additional information is obtained about the facts and circumstances that existed as of the acquisition date. The allocation of the purchase price may be modified up to one year from the date of the acquisition as more information is obtained about the fair value of assets acquired and liabilities assumed.
	The purchase price of $923 million was provisionally allocated as follows:
			(In millions)
	Assets
	Cash		$	22
	Current and non-current assets		49
	Property, plant and equipment		1,057
	Intangible assets		1,420
	Total assets acquired		2,548
	Liabilities
	Debt		1,591
	Current and non-current liabilities		34
	Total liabilities assumed		1,625
	Net assets acquired		$	923
	The Company incurred and expensed acquisition-related transaction costs related to the acquisition of the Alta Wind Assets of $2 million for the three and nine months ended September 30, 2014.
	Fair value measurements
	The provisional fair values of the property, plant and equipment and intangible assets at the acquisition date were measured primarily based on significant inputs that are not observable in the market and thus represent a Level 3 measurement as defined in ASC 820. Significant inputs were as follows:
	Property, plant and equipment - The estimated fair values were determined primarily based on an income method using discounted cash flows and validated using a cost approach based on the replacement cost of the assets less economic obsolescence. The income approach was applied by determining the enterprise value for each acquired entity and subtracting the fair value of the intangible assets and working capital to determine the implied value of the tangible fixed assets. This methodology was primarily relied upon as the forecasted cash flows incorporate the specific attributes of each asset including age, useful life, equipment condition and technology. The income approach also allows for an accurate reflection of current and expected market dynamics such as supply and demand and regulatory environment as of the acquisition date.
	Intangible assets - The fair values of the PPAs acquired were determined utilizing a variation of the income approach where the incremental future cash flows resulting from the acquired PPAs compared to the cash flows based on current market prices were discounted to present value at the weighted average cost of debt of the utility off-taker, as the PPA was determined to be a debt-like instrument for the off-taker. The values were corroborated with available market data. The PPA values will be amortized over an average period of 22 years.
	Supplemental Pro Forma Information
	Since the acquisition date, the Alta Wind Assets contributed $18 million in operating revenues and $7 million in net losses. The following supplemental pro forma information represents the results of operations as if the Company had acquired the Alta Wind Assets on January 1, 2013:
			For the nine months ended						For the year ended
	(in millions except per share amounts)		30-Sep-14			30-Sep-13			31-Dec-13
	Operating revenues		$	551		$	385		$	562
	Net income		67			99			110
	Net income attributable to NRG Yield, Inc.		16			12			11
	Basic and Diluted Earnings per share attributable to NRG Yield, Inc. Class A common stockholders:		$	0.47		$	0.33		$	0.31
	The supplemental pro forma information has been adjusted to include the pro-forma impact of depreciation of property, plant and equipment and amortization of PPAs, based on the preliminary purchase price allocations. The pro forma data has also been adjusted to reflect the additional interest expense in connection with the issuance of Senior Notes, adjustment to the non-controlling interest due to the change in NRG's interest to 55.3% from 65.5% effective July 29, 2014, as well as the related tax impact. There were no transactions during the periods between NRG and the Alta Wind Assets. The pro forma results are presented for illustrative purposes only and do not reflect the realization of potential cost savings or any related integration costs.
	Acquired ROFO Assets — On June 30, 2014, NRG Yield Operating LLC acquired the El Segundo, TA High Desert, and RE Kansas South projects for a total cash consideration of $357 million, which represents a base purchase price of $349 million and $8 million of working capital adjustments. In addition, the acquisition included the assumption of $612 million in project level debt. The assets and liabilities transferred to the Company relate to interests under common control by NRG and accordingly, were recorded at historical cost in accordance with ASC 805-50. The difference between the cash proceeds and historical value of the net assets was recorded as a distribution to NRG and reduced the balance of its noncontrolling interest. Since 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.
	The following is a summary of assets and liabilities transferred in connection with the acquisition:
		RE Kansas South			TA High Desert			El Segundo
		(In millions)
	Current assets	$	1		$	3		$	43
	Property, plant and equipment	50			67			625
	Non-current assets	2			13			76
	Total assets	53			83			744
	Debt	35			57			520
	Other current and non-current liabilities	2			—			30
	Total liabilities	37			57			550
	Net assets acquired	$	16		$	26		$	194
	The following table presents historical information summary combining the financial information for the Acquired ROFO Assets transferred in connection with the acquisition:
		December 31, 2013
		As Previously Reported			RE Kansas South			TA High Desert			El Segundo		As Currently Reported
					(In millions)
	Current assets	$	267		$	25		$	28		$	58	$	378
	Property, plant and equipment	1,541			51			63			636		2,291
	Non-current assets	505			3			10			51		569
	Total assets	2,313			79			101			745		3,238
	Debt	1,133			58			80			512		1,783
	Other current and non-current liabilities	169			5			3			26		203
	Total liabilities	$	1,302		$	63		$	83		$	538	$	1,986
		Three months ended September 30, 2013													Nine months ended September 30, 2013
		As Previously Reported			RE Kansas South			TA High Desert			El Segundo		As Currently Reported		As Previously Reported		RE Kansas South		TA High Desert		El Segundo		As Currently Reported
								(In millions)
	Operating revenues	$	95		$	2		$	3		$	26	$	126	$	227	$	2	$	6	$	26	$	261
	Operating income	45			2			3			13		63		95		2		4		12		113
	Net income	$	40		$	—		$	2		$	7	$	49	$	85	$	1	$	2	$	7	$	95
2013 Acquisitions
Energy Systems — On December 31, 2013, NRG Energy Center Omaha Holdings, LLC, an indirect wholly owned subsidiary of NRG Yield LLC, acquired Energy Systems Company, or Energy Systems, for approximately $120 million. The acquisition was financed from cash on hand. Energy Systems is an operator of steam and chilled water thermal facilities that provides heating and cooling services to nonresidential customers in Omaha, Nebraska. The acquisition was recorded as a business combination under ASC 805, with identifiable assets acquired and liabilities assumed provisionally recorded at their estimated fair values on the acquisition date. The purchase price was primarily allocated to property, plant and equipment of $60 million, customer relationships of $59 million, and $1 million of working capital. The accounting for Energy Systems was completed as of September 30, 2014, at which point the provisional fair values became final with no material changes.

Property_Plant_and_Equipment_N

Property, Plant and Equipment (Notes)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment Disclosure	'
	Property, Plant and Equipment
	The Company’s major classes of property, plant, and equipment were as follows:
		September 30, 2014			31-Dec-13			Depreciable Lives
		(In millions)
	Facilities and equipment	$	3,487		$	2,411		5 - 40 Years
	Land and improvements	48			48
	Construction in progress	7			6
	Total property, plant and equipment	3,542			2,465
	Accumulated depreciation	(266		)	(174		)
	Net property, plant and equipment	$	3,276		$	2,291
	Renewable Energy Grants
	The Borrego solar project achieved commercial operations on February 12, 2013 and transferred the construction in progress to property, plant and equipment. On May 16, 2013, the Borrego solar project, as a qualified renewable energy project, applied for a cash grant in lieu of investment tax credit from the U.S. Treasury Department in the amount of $39 million. A receivable for the cash grant was recorded when the application was filed, which resulted in a reduction to the book basis of the property, plant and equipment. In addition, the receivable was reduced to $36 million as a result of the federal government’s sequestration, which was put into effect on March 1, 2013. The related deferred tax asset of $10 million was recorded with a corresponding reduction of the book value of Borrego’s property, plant and equipment. In March 2014, the Company received payment of $30 million for the cash grant related to Borrego. The Company recorded a reserve for the shortage and is in the process of evaluating all of its options for recovering the full amount of the reserve.
	The TA High Desert solar project achieved commercial operations on March 25, 2013 and transferred the construction in progress to property, plant and equipment. On May 22, 2013, the TA High Desert solar project, as a qualified renewable energy project, applied for a cash grant in lieu of investment tax credit from the U.S. Treasury Department in the amount of $25 million. A receivable for the cash grant was recorded when the application was filed, which resulted in a reduction to the book basis of the property, plant and equipment. In addition, the receivable was reduced as a result of the federal government’s sequestration, which was put into effect on March 1, 2013. The related deferred tax asset of $6 million was recorded with a corresponding reduction of the book value of TA High Desert's property, plant and equipment. In April 2014, TA High Desert received a payment of $20 million for the cash grant and reduced the book value of its property, plant and equipment by the amount by which the grant was reduced.
	The RE Kansas South solar project achieved commercial operations on June 7, 2013 and transferred the construction in progress to property, plant and equipment. On June 27, 2013, the RE Kansas South solar project, as a qualified renewable energy project, applied for a cash grant in lieu of investment tax credit from the U.S. Treasury Department in the amount of $23 million. A receivable for the cash grant was recorded when the application was filed, which resulted in a reduction to the book basis of the property, plant and equipment. In addition, the receivable was reduced to $21 million as a result of the federal government’s sequestration, which was put into effect on March 1, 2013. The related deferred tax asset of $6 million was recorded with a corresponding reduction of the book value of RE Kansas South's property, plant and equipment. In April 2014, RE Kansas South received a payment of $21 million for the cash grant.

Variable_Interest_Entities_or_

Variable Interest Entities, or VIEs (Notes)	9 Months Ended
	Sep. 30, 2014
Variable Interest Entities Disclosure [Abstract]	'
Variable Interest Entity	'
	Variable Interest Entities, or VIEs
	GenConn Energy LLC — The Company has a 49.95% interest in GCE Holdings LLC, the owner of GenConn Energy LLC, or GenConn, which owns and operates two 190 MW peaking generation facilities in Connecticut at the Devon and Middletown sites. Each of these facilities was constructed pursuant to a 30-year cost of service type contract with the Connecticut Light & Power Company. All four units at the GenConn Devon facility reached commercial operation in June 2010 and were released to the ISO-NE by July 2010. In June 2011, all four units at the GenConn Middletown facility reached commercial operation and were released to the ISO-NE. GenConn is considered a VIE under ASC 810, however the Company is not the primary beneficiary, and accounts for its investment under the equity method.
	The project was funded through equity contributions from the owners and non-recourse, project level debt. As of September 30, 2014, the Company's investment in GenConn was $114 million and its maximum exposure to loss is limited to its equity investment. On September 17, 2013, GenConn refinanced its existing project financing facility. As of September 30, 2014, the refinanced facility has a $228 million note with an interest rate of 4.73% per annum and a maturity date of July 2041 and a $35 million working capital facility that matures in 2018 which can be used to issue letters of credit at an interest rate of 1.875% per annum. The refinancing is secured by all of the GenConn assets.
	The following table presents summarized unaudited financial information for GCE Holdings LLC:
		Three months ended September 30,				Nine months ended September 30,
		2014		2013		2014		2013
	Income Statement Data:	(In millions)
	Operating revenues	$	18	$	21	$	62	$	60
	Operating income	10		11		30		34
	Net income	7		8		21		23
		September 30, 2014		December 31, 2013
	Balance Sheet Data:	(In millions)
	Current assets	$	26	$	32
	Non-current assets	442		453
	Current liabilities	15		18
	Non-current liabilities	224		231

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments (Notes)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	For cash and cash equivalents, restricted cash, accounts receivable — trade, accounts payable, affiliate accounts payable and receivable, accrued expenses and other liabilities, the carrying amount approximates 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 September 30, 2014								As of December 31, 2013
		Carrying Amount				Fair Value				Carrying Amount		Fair Value
		(In millions)
	Assets:
	Notes receivable — affiliate	$	—			$	—			$	2	$	2
	Notes receivable, including current portion	23				23				27		27
	Liabilities:
	Long-term debt, including current portion	4,083				4,157				1,783		1,785
	The fair value of notes receivable and long-term debt are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments and are classified as Level 3 within the fair value hierarchy.
	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.
	Recurring Fair Value Measurements
	The Company records its derivative assets and liabilities at fair market 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 September 30, 2014
		Fair Value (a)
	(In millions)	Level 2				Level 3				Total
	Derivative assets:
	Commodity contracts	$	—			$	—			$	—
	Interest rate contracts	7				—				7
	Total assets	7				—				7
	Derivative liabilities:
	Commodity contracts	1				—				1
	Interest rate contracts	52				—				52
	Total liabilities	$	53			$	—			$	53
	(a) There were no assets or liabilities classified as Level 1 as of September 30, 2014.
		As of December 31, 2013
		Fair Value (a)
	(In millions)	Level 2				Level 3				Total
	Derivative assets:
	Commodity contracts	$	1			$	—			$	1
	Interest rate contracts	20				—				20
	Total assets	21				—				21
	Derivative liabilities:
	Commodity contracts	1				1				2
	Interest rate contracts	45				—				45
	Total liabilities	$	46			$	1			$	47
	(a) There were no assets or liabilities classified as Level 1 as of December 31, 2013.
	The following table reconciles, for the three and nine months ended September 30, 2014, the beginning and ending balances for derivative instruments that are recognized at fair value in the consolidated financial statements, at least annually, using significant unobservable inputs:
			Fair Value Measurement Using Significant Unobservable Inputs - Derivatives (Level 3)
			Three months ended September 30,				Nine months ended September 30,
	(In millions)		2014				2014
	Beginning balance		$	(1	)		$	(1	)
	Included in earnings		1				1
	Ending balance as of September 30, 2014		$	—			$	—
	Derivative Fair Value Measurements
	A majority of 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 remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available. These contracts are valued using various valuation techniques including but not limited to internal models that apply fundamental analysis of the market and corroboration with similar markets.
	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 calculated based on credit default swaps. To the extent that the net exposure is an asset, the Company uses the counterparty’s default swap rate. If the exposure is a liability, the Company uses its default swap rate. 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. 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
	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) a 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. The Company also has credit protection within various agreements to call on additional collateral support if and when necessary. Cash margin is collected and held at the Company to cover the credit risk of the counterparty until positions settle.
	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 September 30, 2014, credit risk exposure to these counterparties attributable to the Company's ownership interests was approximately $1.7 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.

Accounting_for_Derivative_Inst

Accounting for Derivative Instruments and Hedging Activities (Notes)	9 Months Ended
	Sep. 30, 2014
Accounting for Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Accounting for Derivative Instruments and Hedging Activities	'
	Accounting for Derivative Instruments and Hedging Activities
	Energy-Related Commodities
	As of September 30, 2014, the Company had forward contracts for the purchase of fuel commodities relating to the forecasted usage of the Company’s district energy centers extending through 2017. At September 30, 2014, these contracts were not designated as cash flow or fair value hedges.
	Interest Rate Swaps
	As of September 30, 2014, the Company had interest rate derivative instruments on project-level debt extending through 2031, some of which are designated as cash flow hedges.
	Volumetric Underlying Derivative Transactions
	The following table summarizes the net notional volume buy/(sell) of the Company's open derivative transactions broken out by category as of September 30, 2014 and December 31, 2013.
			Total Volume
			September 30, 2014			December 31, 2013
	Category	Units	(In millions)
	Natural Gas	MMBtu	3			2
	Interest	Dollars	$	2,125		$	1,234
	The increase in the interest rate position was primarily the result of the interest rate swaps acquired with the Alta Wind Assets.
	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
		September 30, 2014			December 31, 2013			September 30, 2014			December 31, 2013
		(In millions)
	Derivatives Designated as Cash Flow Hedges:
	Interest rate contracts current	$	—		$	—		$	24		$	26
	Interest rate contracts long-term	5			14			18			16
	Total Derivatives Designated as Cash Flow Hedges	5			14			42			42
	Derivatives Not Designated as Cash Flow Hedges:
	Interest rate contracts current	—			—			5			3
	Interest rate contracts long-term	2			6			5			—
	Commodity contracts current	—			1			1			2
	Commodity contracts long-term	—			—			—			—
	Total Derivatives Not Designated as Cash Flow Hedges	2			7			11			5
	Total Derivatives	$	7		$	21		$	53		$	47
	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 September 30, 2014 and December 31, 2013, there was no outstanding collateral paid or received. The following table summarizes the offsetting of derivatives by counterparty master agreement level:
		Gross Amounts Not Offset in the Statement of Financial Position
		Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
	As of September 30, 2014	(In millions)
	Commodity contracts:
	Derivative assets	$	—		$	—		$	—
	Derivative liabilities	(1		)	—			(1		)
	Total commodity contracts	(1		)	—			(1		)
	Interest rate contracts:
	Derivative assets	7			(5		)	2
	Derivative liabilities	(52		)	5			(47		)
	Total interest rate contracts	(45		)	—			(45		)
	Total derivative instruments	$	(46	)	$	—		$	(46	)
		Gross Amounts Not Offset in the Statement of Financial Position
	As of December 31, 2013	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
	Commodity contracts:	(In millions)
	Derivative assets	$	1		$	—		$	1
	Derivative liabilities	(2		)	—			(2		)
	Total commodity contracts	(1		)	—			(1		)
	Interest rate contracts:
	Derivative assets	20			(12		)	8
	Derivative liabilities	(45		)	12			(33		)
	Total interest rate contracts	(25		)	—			(25		)
	Total derivative instruments	$	(26	)	$	—		$	(26	)
	Accumulated Other Comprehensive Loss
	The following table summarizes the effects on the Company’s accumulated other comprehensive loss, or OCL, balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax:
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
		(In millions)						(In millions)
	Accumulated OCL beginning balance	$	(24	)	$	(19	)	$	—		$	(48	)
	Reclassified from accumulated OCL to income due to realization of previously deferred amounts	1			4			8			9
	Mark-to-market of cash flow hedge accounting contracts	6			1			(25		)	25
	Accumulated OCL ending balance, net of income tax benefit of $3 and $1, respectively	(17		)	(14		)	(17		)	(14		)
Accumulated OCL attributable to NRG	(11		)	(6		)	(11		)	(6		)
Accumulated OCL attributable to NRG Yield, Inc.	$	(6	)	$	(8	)	$	(6	)	$	(8	)
A loss of $12 million is expected to be realized from OCL during the next 12 months, net of $2 million tax.
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.
Impact of Derivative Instruments on the Statements of Operations
The Company has interest rate derivative instruments that are not designated as cash flow hedges as well as ineffectiveness on cash flow hedge derivatives. The effect of interest rate hedges is recorded to interest expense. For the three months ended September 30, 2014 and 2013, the impact to the consolidated statements of operations was $0 million and a gain of $1 million, respectively. For the nine months ended September 30, 2014 and 2013, the impact to the consolidated statements of operations was a loss of $6 million and a gain of $10 million, respectively.
The Company’s derivative commodity contracts relate 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 statement of operations for these contracts.
See Note 6, Fair Value of Financial Instruments, for discussion regarding concentration of credit risk.

Longterm_Debt_Notes

Long-term Debt (Notes)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Long-term Debt	'
	Long - Term Debt
	This footnote should be read in conjunction with the complete description under Note 9, Long - Term Debt, to the Company's 2013 Form 10-K. Long-term debt consisted of the following:
		September 30, 2014				December 31, 2013			Current interest rate % (a)
		(In millions, except rates)
	NRG Yield Inc. Convertible Senior Notes, due 2019 (b)	$	325			$	—		3.5
	NRG Yield LLC Senior Notes, due 2024	500				—			5.375
	Project-level debt:
	Alta Wind I, lease financing arrangement, due 2034	263				—			7.01
	Alta Wind II, lease financing arrangement, due 2034	207				—			5.7
	Alta Wind III, lease financing arrangement, due 2034	215				—			6.07
	Alta Wind IV, lease financing arrangement, due 2034	139				—			5.94
	Alta Wind V, lease financing arrangement, due 2035	222				—			6.07
	Alta Wind X, due 2020	300				—			L+2.00
	Alta Wind XI, due 2020	191				—			L+2.00
	Alta Realty Investments, due 2031	34				—			7
	Alta Wind Asset Management, due 2031	20				—			L+2.375
	NRG West Holdings LLC, due 2023	506				512			L+2.25 - 2.875
	NRG Marsh Landing LLC, due 2017 and 2023	477				473			L+ 1.75 - 1.875
	NRG Solar Alpine LLC, due 2022	166				221			L+2.50/L+1.75
	NRG Energy Center Minneapolis LLC, due 2017 and 2025	122				127			5.95 - 7.25
	NRG Solar Borrego LLC, due 2024 and 2038	76				78			L+ 2.50/5.65
	South Trent Wind LLC, due 2020	66				69			L+2.75
	NRG Solar Avra Valley LLC, due 2031	64				63			L+ 1.75
	TA High Desert LLC, due 2023 and 2033	57				80			L+2.50/5.15
	NRG Roadrunner LLC, due 2031	42				44			L+ 2.01
	NRG Solar Kansas South LLC, due 2031	36				58			L+2.00
	NRG Solar Blythe LLC, due 2028	23				24			L+ 2.75
	PFMG and related subsidiaries financing agreement, due 2030	31				32			6
	NRG Energy Center Princeton LLC, due 2017	1				2			5.95
	Subtotal project-level debt:	3,258				1,783
	Total debt	4,083				1,783
	Less current maturities	157				214
	Total long-term debt	$	3,926			$	1,569
	(a) As of September 30, 2014, L+ equals 3 month LIBOR plus x%, except for Kansas South where L+ equals 6 month LIBOR plus x%.
	(b) Net of discount of $20 million as of September 30, 2014.
	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 arrangement. As of September 30, 2014, the Company was in compliance with all of the required covenants.
	The discussion below lists changes to or additions of long-term debt for the nine months ended September 30, 2014.
	NRG Yield, Inc. Convertible Notes
	During the first quarter of 2014, the Company closed on its offering of $345 million aggregate principal amount of 3.50% Convertible Notes due 2019, or the Convertible Notes.  The Convertible Notes are convertible, under certain circumstances, into the Company’s Class A common stock, cash or a combination thereof at an initial conversion price of $46.55 per Class A common share, which is equivalent to an initial conversion rate of approximately 21.4822 shares of Class A common stock per $1,000 principal amount of Convertible Notes. Interest on the Convertible Notes is payable semi-annually in arrears on February 1 and August 1 of each year, commencing on August 1, 2014. The Convertible Notes mature on February 1, 2019, unless earlier repurchased or converted in accordance with their terms. Prior to the close of business on the business day immediately preceding August 1, 2018, the Convertible Notes will be convertible only upon the occurrence of certain events and during certain periods, and thereafter, at any time until the close of business on the second scheduled trading day immediately preceding the maturity date. The Convertible Notes are guaranteed by NRG Yield Operating LLC and NRG Yield LLC.
	The convertible notes are accounted for in accordance with ASC 470-20, Debt with Conversion and Other Options. Under ASC 470-20, issuers of convertible debt instruments that may be settled in cash upon conversion, including partial cash settlement, are required to separately account for the liability (debt) and equity (conversion option) components. The application of ACS 470-20 resulted in the recognition of $23 million as the value for the equity component with the offset to debt discount. The debt discount will be amortized to interest expense using the effective interest method over the term of the Convertible Notes.
	NRG Yield Operating LLC Senior Notes
	On August 5, 2014, NRG Yield Operating LLC issued $500 million of senior unsecured notes, or the Senior Notes. The Senior Notes bear interest at 5.375% and mature in August 2024. Interest on the notes is payable semi-annually on February 15 and August 15 of each year, commencing on February 15, 2015. The Senior Notes are senior unsecured obligations of NRG Yield Operating LLC and are guaranteed by NRG Yield LLC, and by certain of NRG Yield Operating LLC’s wholly owned current and future subsidiaries. The Senior Notes were issued as “Green Bonds,” and all proceeds from the Senior Notes were used to purchase the Alta Wind Assets, which qualify as eligible green projects.
	NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility
	In connection with the Company's initial public offering of Class A common stock in July 2013, as further described in Note 1, Nature of Business, NRG Yield LLC and NRG Yield Operating LLC entered into a senior secured revolving credit facility, which provided a revolving line of credit of $60 million. On April 25, 2014, NRG Yield LLC and NRG Yield Operating LLC amended the revolving credit facility to increase the available line of credit to $450 million and extend its maturity to April 2019. The revolving credit facility can be used for cash or for the issuance of letters of credit. There was no cash drawn and $27 million of letters of credit issued under the revolving credit facility as of September 30, 2014.
	Project - level Debt
	NRG West Holdings Credit Agreement
	On August 23, 2011, NRG West Holdings LLC, or West Holdings, entered into a credit agreement with a group of lenders in respect to the El Segundo project, or the West Holdings Credit Agreement. The West Holdings Credit Agreement is comprised of a $540 million two tranche construction loan facility with additional facilities for the issuance of letters of credit or working capital loans and is secured by the assets of West Holdings.
	The two tranche construction loan facility consists of the $480 million Tranche A Construction Facility, or the Tranche A Facility, and the $60 million Tranche B Construction Facility, or the Tranche B Facility. The Tranche A and Tranche B Facilities, which mature in August 2023, convert to a term loan and have an interest rate of 3-month LIBOR, plus an applicable margin which (i) increases by 0.125% periodically from conversion through year eight for the Tranche A Facility, and (ii) increases by (A) 0.125% upon term conversion and on the third and sixth anniversary of the term conversion and (B) by 0.025% on the eighth anniversary of the term conversion for the Tranche B Facility. The Tranche A and Tranche B Facilities amortize based upon a predetermined schedule over the term of the loan with the balance payable at maturity. The construction loan converted to a term loan on January 28, 2014.
	The West Holdings Credit Agreement also provides for the issuance of letters of credit and working capital loans to support the El Segundo project's collateral needs. This includes letter of credit facilities on behalf of West Holdings of up to $90 million in support of the PPA, up to $48 million in support of the collateral agent, and a working capital facility which permits loans or the issuance of letters of credit of up to $10 million.
	As of September 30, 2014, under the West Holdings Credit Agreement, West Holdings had $447 million outstanding under the Tranche A Facility, $59 million under the Tranche B Facility, issued a $33 million letter of credit in support of the PPA, a $48 million letter in support of debt service and a $1 million letter of credit under the working capital facility.
	Alpine Financing
	On March 16, 2012, NRG Solar Alpine LLC, or Alpine, entered into a credit agreement with a group of lenders for a $166 million construction loan that was convertible to a term loan upon completion of the project and a $68 million cash grant loan. On January 15, 2013, the credit agreement was amended, reducing the cash grant loan to $63 million. On March 26, 2013, Alpine met the conditions under the credit agreement to convert the construction loan to a term loan. Immediately prior to the conversion, the Company drew an additional $164 million under the construction loan and $62 million under the cash grant loan. The term loan amortizes on a predetermined schedule with final maturity in November 2022.
	In January 2014, Alpine repaid the $62 million of outstanding cash grant loan, including accrued interest and breakage fees, with the proceeds that it had received from the U.S. Treasury Department, as further described in in Note 4, Property, Plant and Equipment. On June 24, 2014, Alpine amended the credit agreement to increase its term loan borrowings by an additional $13 million and to reduce the related interest rate to 3 month LIBOR plus 1.75% through June 30, 2019 and 3 month LIBOR plus 2.00% through November 2022. The proceeds were utilized to make a distribution of $11 million to NRG Yield Operating LLC with the remaining $2 million utilized to fund the costs of the amendment.
	TA High Desert Facility
	The TA High Desert Facility is comprised of $53 million of fixed rate notes due 2033 at an interest rate of 5.15%, $7 million of floating rate notes due 2023, $22 million of bridge notes due the earlier of ten days after receipt of the cash grant or May 2014, and a revolving facility of $12 million. The floating rate notes have an interest rate of 3 month LIBOR plus 2.5% with LIBOR floor of 1.5%, while the bridge notes have an interest rate of 1 month LIBOR plus 2.50%. As described in Note 4, Property, Plant and Equipment, in April 2014, TA High Desert received payment of $20 million for its cash grant and utilized the proceeds, along with an additional $2 million of cash contributed by NRG to repay the cash grant bridge loan. The revolving facility can be used for cash or for the issuance of up to $9 million in letters of credit. As of September 30, 2014, $57 million of notes were outstanding and $8 million of letters of credit were outstanding under the revolving facility.  The notes amortize on predetermined schedules and are secured by all of the assets of TA High Desert.
	RE Kansas South Facility
	The RE Kansas South Facility includes a $38 million term loan due 2031 and a $21 million cash grant bridge loan due ten days after receipt of the cash grant. The term loan has an interest rate of 6 month LIBOR plus an applicable margin of 2.625% and increases by 0.25% every 4 years. The cash grant bridge loan had an interest rate of 1 month LIBOR plus an applicable margin of 2.00%. The term loan amortizes on a predetermined schedule and is secured by all of the assets of RE Kansas South. As described in Note 4, Property, Plant and Equipment, in April 2014, the Company received payment of $21 million for the cash grant related to RE Kansas South and utilized the proceeds to repay the cash grant bridge loan. As of September 30, 2014, $36 million was outstanding under the term loan and $4 million of letters of credit were issued under the RE Kansas South Facility. On September 26, 2014, RE Kansas South amended its credit agreement to change the interest rate to 6 month LIBOR plus 2.00% through September 30, 2019 and to 6 month LIBOR plus 2.250% thereafter.
	Additional Project-level Debt Amendments
	On July 9, 2014, Avra Valley amended its credit agreement to increase its borrowings by $3 million and to reduce the related interest rate from 3 month LIBOR plus an applicable margin of 2.25% to 3 month LIBOR plus 1.75%. The proceeds were primarily utilized to make a distribution to NRG Yield Operating LLC.
	On July 17, 2014, Marsh Landing amended its credit agreement to increase its borrowings by $34 million and to reduce the related interest rate for the Tranche A borrowings from 3 month LIBOR plus an applicable margin of 2.75% to 3 month LIBOR plus 1.75% through December 2017 and to 3 month LIBOR plus 2.00% thereafter; and for the Tranche B to reduce the related interest rate from 3 month LIBOR plus 3.00% to 3 month LIBOR plus 1.875% through December 2017 and to 3 month LIBOR plus 2.125% thereafter. The proceeds from the borrowings were utilized to make a distribution of $29 million to NRG Yield Operating LLC and to fund the costs of the amendment.
	Alta Wind Financing Arrangements
	As described in Note 3, Business Acquisitions, the Company acquired the Alta Wind Assets on August 12, 2014. In connection with the acquisition, the Company assumed the following debt arrangements:
	Term loan and note facilities
Amount in millions, except rates		Term Loan Facility							Letter of Credit Facility					Notes Payable
Non-Recourse Debt		Amount Outstanding as of September 30, 2014				Interest Rate	Maturity Date		Amount Outstanding as of September 30, 2014			Interest Rate	Maturity Date	Amount Outstanding as of September 30, 2014		Interest Rate	Maturity Date
Alta Realty		$	—			—	—		$	—		—	—	$	34	7.00%	1/31/31
AWAM		20				3-Month LIBOR + 2.375%	5/15/31		—			—	—	—		—	—
Alta X		300				3-Month LIBOR + 2.00%	3/31/20		5			2.00%	3/31/20	—		—	—
Alta XI		191				3-Month LIBOR + 2.00%	3/31/20		—			—	—	—		—	—
Total		$	511						$	5				$	34
All of the assets of Alta X and Alta XI are pledged as collateral under their respective agreements.
Lease financing arrangements
Alta Wind Holdings (Alta Wind II - V) and Alta I have finance lease obligations issued under lease transactions whereby the respective operating entities sold and leased back undivided interests in specific assets of the project. All of the assets of Alta I - V are pledged as collateral under these arrangements. The sale and related lease transactions are accounted for as financing arrangements as the operating entities have continued involvement with the property.
Amount in millions, except rates		Lease Financing Arrangement							Letter of Credit Facility
Non-Recourse Debt		Amount Outstanding as of September 30, 2014				Interest Rate	Maturity Date		Amount Outstanding as of September 30, 2014			Interest Rate	Maturity Date
Alta Wind I		$	263			7.02%	12/30/34		$	16		3.25%	1/5/16
Alta Wind II		207				5.70%	12/30/34		25			2.75%	12/31/17
Alta Wind III		215				6.07%	12/30/34		25			2.75%	4/13/18
Alta Wind IV		139				5.94%	12/30/34		18			2.75%	5/20/18
Alta Wind V		222				6.07%	6/30/35		28			2.75%	6/13/18
Total		$	1,046						$	112
Interest Rate Swaps — Alta Wind Project Financings
Certain of Alta Wind's project subsidiaries entered into interest rate swaps, intended to hedge the risks associated with interest rates on non-recourse project level debt. These swaps amortize in proportion to their respective loans and are floating for fixed where the project subsidiary pays its counterparty the equivalent of a fixed interest payment on a predetermined notional value and will receive quarterly the equivalent of a floating interest payment based on the same notional value. All interest rate swap payments by a project subsidiary and its counterparty are made quarterly and LIBOR is determined in advance of each interest period. The following table summarizes the swaps related to Alta Wind project level debt as of September 30, 2014:
Non-Recourse Debt		% of Principal		Fixed Interest Rate		Floating Interest Rate	Notional Amount at September 30, 2014				Effective Date	Maturity Date
							(In millions)
Alta X		100%		various		3-Month LIBOR	$	216			31-Dec-13	31-Dec-15
Alta X		100%		various		3-Month LIBOR	84				31-Dec-13	31-Dec-25
Alta X		100%		various		3-Month LIBOR	162				31-Dec-15	31-Dec-20
Alta X		100%		various		3-Month LIBOR	103				31-Dec-20	31-Dec-25
Alta XI		100%		various		3-Month LIBOR	138				31-Dec-13	31-Dec-15
Alta XI		100%		various		3-Month LIBOR	53				31-Dec-13	31-Dec-25
Alta XI		100%		various		3-Month LIBOR	103				31-Dec-15	31-Dec-20
Alta XI		100%		various		3-Month LIBOR	65				31-Dec-20	31-Dec-25
AWAM		100%		2.47%		3-Month LIBOR	20				22-May-13	15-May-31
Total							$	944

Earnings_Per_Share_Notes

Earnings Per Share (Notes)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	Basic and diluted earnings per Class A common share are computed by dividing net income attributable to NRG Yield, Inc. by the weighted average number of Class A common shares outstanding. Shares issued during the year are weighted for the portion of the year that they were outstanding.
	The reconciliation of the Company's basic and diluted earnings per share is shown in the following table:
		Three months ended September 30,		Nine months ended September 30,		Period from July 23, 2013 to September 30,
		2014		2014		2013
	(In millions, except per share data)
	Basic and diluted earnings per share attributable to Class A common stockholders
	Net Income Attributable to NRG Yield, Inc.	$	6	$	16	$	9
	Weighted average number of Class A common shares outstanding	31		25		23
	Basic and Diluted Earnings per Class A common share	$	0.2	$	0.62	$	0.39
	There was a total of 7 million and 6 million shares of Class A common stock that were anti-dilutive for the three months and nine months ended September 30, 2014, respectively.

Changes_in_Capital_Structure

Changes in Capital Structure	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Changes in Capital Structure	'
	Changes in Capital Structure
	As of September 30, 2014 and December 31, 2013, the Company had 34,586,250 and 22,511,250 shares of Class A common stock outstanding, respectively. On July 29, 2014, the Company issued 12,075,000 Class A common shares for net proceeds, after underwriting discount and expenses, of $630 million.
	The following table lists the dividends paid on the Company's Class A common stock during the nine months ended September 30, 2014:
		Third Quarter 2014		Second Quarter 2014		First Quarter 2014
	Dividends per share	$	0.365	$	0.35	$	0.33
	On November 5, 2014, the Company declared a quarterly dividend on its Class A common stock of $0.375 per share payable on December 15, 2014 to stockholders of record as of December 1, 2014.
	The Company's Class A common stock dividends are subject to available capital, market conditions, and compliance with associated laws and regulations.

Segment_Reporting_Notes

Segment Reporting (Notes)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Reporting	'
	Segment Reporting
	The Company’s segment structure reflects how management currently makes financial decisions and allocates resources. Its 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.
		Three months ended September 30, 2014
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	65		$	48		$	48		$	—		$	161
	Cost of operations	9			11			32			—			52
	Depreciation and amortization	15			14			5			—			34
	General and administrative — affiliate	—			—			—			3			3
	Acquisition-related transaction and integration costs	—			—			—			2			2
	Operating income (loss)	41			23			11			(5		)	70
	Equity in earnings of unconsolidated affiliates	4			7			—			—			11
	Other income, net	—			—			—			1			1
	Interest expense	(11		)	(19		)	(2		)	(9		)	(41		)
	Income (loss) before income taxes	34			11			9			(13		)	41
	Net Income (Loss)	34			11			9			(23		)	31
	Total Assets	$	1,526		$	3,413		$	434		$	526		$	5,899
		Three months ended September 30, 2013
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	57		$	29		$	40		$	—		$	126
	Cost of operations	13			3			28			—			44
	Depreciation and amortization	7			7			4			—			18
	General and administrative — affiliate	—			—			—			1			1
	Operating income (loss)	37			19			8			(1		)	63
	Equity in earnings of unconsolidated affiliates	5			7			—			—			12
	Interest expense	(10		)	(9		)	(2		)	—			(21		)
	Income (loss) before income taxes	32			17			6			(1		)	54
	Net Income (Loss)	$	32		$	17		$	6		$	(6	)	$	49
		Nine months ended September 30, 2014
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	182		$	97		$	156		$	—		$	435
	Cost of operations	31			18			108			—			157
	Depreciation and amortization	51			29			14			—			94
	General and administrative — affiliate	—			—			—			7			7
	Acquisition-related transaction and integration costs	—			—			—			2			2
	Operating income (loss)	100			50			34			(9		)	175
	Equity in earnings of unconsolidated affiliates	11			15			—			—			26
	Other income, net	—			1			—			1			2
	Interest expense	(33		)	(41		)	(6		)	(17		)	(97		)
	Income (loss) before income taxes	78			25			28			(25		)	106
	Net Income (Loss)	78			25			28			(40		)	91
		Nine months ended September 30, 2013
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	77		$	71		$	113		$	—		$	261
	Cost of operations	16			8			81			—			105
	Depreciation and amortization	9			18			11			—			38
	General and administrative — affiliate	—			—			—			5			5
	Operating income (loss)	52			45			21			(5		)	113
	Equity in earnings of unconsolidated affiliates	12			6			—			—			18
	Interest expense	(13		)	(13		)	(6		)	—			(32		)
	Other income, net	1			—			—			—			1
	Income (loss) before income taxes	52			38			15			(5		)	100
	Net Income (Loss)	$	52		$	38		$	15		$	(10	)	$	95

Income_Taxes_Notes

Income Taxes (Notes)	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Effective Tax Rate
	The income tax provision consisted of the following:
		Three months ended September 30,						Nine months ended September 30,
	(In millions, except otherwise noted)	2014			2013			2014			2013
	Income before income taxes	$	41		$	54		$	106		$	100
	Income tax expense	10			5			15			5
	Effective tax rate	24.4		%	9.3		%	14.2		%	5		%
	For the three and nine months ended September 30, 2014 and 2013, the overall effective tax rate was different than the statutory rate of 35% primarily due to taxable earnings allocated to NRG resulting from its interest of 55.3% and 65.5%, respectively, in NRG Yield LLC.
	On July 22, 2013, the Company acquired a controlling interest in NRG Yield LLC and its subsidiary NRG Yield Operating LLC. On July 29, 2014, the Company issued additional shares of Class A common stock, and as a result, it currently owns 44.7% of NRG Yield LLC and consolidates the results due to its controlling interest. The Company records NRG's 55.3% ownership as noncontrolling interest in the financial statements. For tax purposes, NRG Yield LLC is treated as a partnership, therefore, the Company and NRG each record their respective share of taxable income or loss.
	The Company's deferred tax balances reflect the difference in book and tax basis of the Company's assets primarily due to an increase in the tax basis of property, plant and equipment. The change in tax basis resulted in a non-cash addition of $71 million during the nine months ended September 30, 2014 and $153 million during the year ended December 31, 2013 to the Company's additional paid-in capital.

Related_Party_Transactions_Not

Related Party Transactions (Notes)	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions Disclosure	'
	Related Party Transactions
	Management Services Agreement with NRG
	Subsequent to the initial public offering, 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 September 30, 2014, the base management fee was approximately $1.5 million per quarter 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 future acquisitions and as a result of a change in the scope of services provided under the Management Services Agreement. The fee was increased by approximately $2 million per year in connection with the acquisition of the Acquired ROFO Assets and Alta Wind Assets. Costs incurred under this agreement were approximately $7 million for the nine months ended September 30, 2014, which included certain direct expenses incurred by NRG on behalf of the Company in addition to the base management fee.
	Operation and Maintenance Services Agreements by and between NRG and Thermal Entities
	On October 1, 2014, NRG entered into Plant Operation and Maintenance Services Agreements with certain wholly owned subsidiaries of the Company. NRG agreed to provide necessary and appropriate services to operate and maintain the subsidiaries' plant operations, businesses and thermal facilities. NRG is to be 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.
	Accounts Payable to NRG Renew LLC
	During the third quarter of 2013, NRG Renew LLC (formerly known as NRG Solar LLC), a wholly-owned subsidiary of NRG, made 100% of the required capital contributions to CVSR, including the Company's 48.95% portion, of which $14 million was outstanding as of December 31, 2013. This balance was repaid to NRG Renew LLC during the quarter ended March 31, 2014.
	Accounts Payable to NRG Repowering Holdings LLC
	During 2013, NRG Repowering Holdings, LLC, a wholly-owned subsidiary of NRG, made payments to BA Leasing BSC, LLC, or BA Leasing, of $18 million, which were expected to be repaid with the proceeds of the cash grant received by BA leasing with respect to the PFMG DG Solar Projects, a wholly-owned subsidiary of the Company, in connection with a sale-leaseback arrangement between the PFMG DG Solar Projects and BA Leasing. As of December 31, 2013, PFMG DG Solar Projects had a corresponding receivable for the reimbursement of the cash grant from BA Leasing and related payable to NRG Repowering Holdings, LLC. In the first quarter of 2014, the PFMG DG Solar Projects received $11 million from BA Leasing and reduced the remaining receivable with an offset to the deferred liability recorded in connection with the sale-leaseback arrangement. The PFMG DG Solar Projects utilized the $11 million to repay NRG Repowering Holdings LLC.

Environmental_Matters_Notes

Environmental Matters (Notes)	9 Months Ended
	Sep. 30, 2014
Environmental Remediation Obligations [Abstract]	'
Environmental Matters	'
	Environmental Matters
	In 2013, NRG Energy Center San Francisco LLC, a wholly owned indirect subsidiary of the Company, received a notice of violation from the San Francisco Department of Public Health alleging improper monitoring of three underground storage tanks. The tanks have not leaked. The Company settled the matter in July 2014 for $123,000.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Use of Estimates, Policy [Policy Text Block]	'
	Use of Estimates
	The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amount of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements. They also impact the reported amount of net earnings during the reporting period. Actual results could be different from these estimates.
Noncontrolling Interest Disclosure [Text Block]	'
	Noncontrolling Interest
	The following table reflects the changes in the Company's noncontrolling interest balance:
		(In millions)
	Balance as of December 31, 2013 (As previously reported)	$	382
	Net Assets of Acquired ROFO Assets as of December 31, 2013	241
	Balance as of December 31, 2013 (As currently reported)	623
	Payment to NRG for Acquired ROFO assets	(357		)
	Comprehensive income, including pre-acquisition net income from Acquired ROFO Assets	65
	Non-cash contributions	13
	Cash distributions, net of cash contributions	(65		)
	Balance as of September 30, 2014	$	279
Cash Flow, Supplemental Disclosures [Text Block]	'
	Distributions
	On January 30, 2014, NRG Yield LLC declared a distribution on its units of $0.33 per unit, which was paid on March 17, 2014. On May 5, 2014, NRG Yield LLC declared a distribution on its units of $0.35 per unit, which was paid on June 16, 2014. On July 29, 2014, NRG Yield LLC declared a distribution on its units of $0.365 per unit, which was paid on September 15, 2014. The portion of the distributions paid by NRG Yield LLC to NRG was recorded as a reduction to the Company's noncontrolling interest balance.
	On June 30, 2014, the Company acquired the TA High Desert, RE Kansas South, and El Segundo projects, as discussed in Note 3, Business Acquisitions. The difference between the cash paid and historical value of the entities' equity of $113 million was recorded as a distribution to NRG and reduced the balance of its noncontrolling interest. In addition, as the TA High Desert, RE Kansas South and El Segundo projects were owned by NRG until June 30, 2014, the pre-acquisition earnings of such projects are recorded as attributable to NRG's noncontrolling interest. Prior to the date of acquisition, El Segundo made a distribution to NRG of $24 million.
New Accounting Pronouncements, Policy [Policy Text Block]	'
	Recent Accounting Developments
	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. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 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 the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position.
	ASU 2013-11 - In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740) Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, or ASU No. 2013-11.  The amendments of ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction of a deferred tax asset for an NOL, a similar tax loss or tax credit carryforwards rather than a liability when the tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and the entity intends to use the deferred tax asset for that purpose.  The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 with early adoption permitted. The Company adopted this standard effective January 1, 2014. The adoption of this standard did not impact the Company's results of operations or cash flows as the Company has no uncertain tax benefits as of September 30, 2014.

Segment_Reporting_Segment_Repo

Segment Reporting Segment Reporting, Policy (Policies)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Reporting, Policy	'
	The Company’s segment structure reflects how management currently makes financial decisions and allocates resources. Its 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.

Nature_of_Business_Nature_of_B

Nature of Business Nature of Business (Tables)	9 Months Ended
	Sep. 30, 2014
Nature of Business Disclosure [Abstract]	'
IPO of NRG Yield	'
	The following table represents the structure of the Company as of September 30, 2014:
	Fo
The Company's operating assets are comprised of the following projects:	'
	the Company's operating assets are comprised of the following projects:
	Projects	Percentage Ownership		Net Capacity (MW) (a)	Offtake Counterparty	Expiration
	Conventional
	GenConn Middletown	49.95	%	95	Connecticut Light & Power	2041
	GenConn Devon	49.95	%	95	Connecticut Light & Power	2040
	Marsh Landing	100	%	720	Pacific Gas and Electric	2023
	El Segundo	100	%	550	Southern California Edison	2023
				1,460
	Utility-Scale Solar
	Alpine	100	%	66	Pacific Gas and Electric	2033
	Avenal	49.95	%	23	Pacific Gas and Electric	2031
	Avra Valley	100	%	25	Tucson Electric Power	2032
	Blythe	100	%	21	Southern California Edison	2029
	Borrego	100	%	26	San Diego Gas and Electric	2038
	CVSR	48.95	%	122	Pacific Gas and Electric	2038
	Roadrunner	100	%	20	El Paso Electric	2031
	RE Kansas South	100	%	20	Pacific Gas and Electric	2033
	TA High Desert	100	%	20	Southern California Edison	2033
				343
	Distributed Solar
	AZ DG Solar Projects	100	%	5	Various	2025 - 2033
	PFMG DG Solar Projects	51	%	5	Various	2032
				10
	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	100	%	137	Southern California Edison	2038(c)
	Alta XI	100	%	90	Southern California Edison	2038(c)
	South Trent	100	%	101	AEP Energy Partners	2029
				1,048
	Thermal
	Thermal equivalent MWt(b)	100	%	1,346	Various	Various
	Thermal generation	100	%	123	Various	Various
	Total net capacity (excluding equivalent MWt)			2,984
	(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 September 30, 2014.
	(b) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 118 MWt which is available under the right-to-use provisions contained in agreements between two of NRG Yield Inc.'s thermal facilities and certain of their customers

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Schedule of Change in Noncontrolling Interest [Table Text Block]	'
	Noncontrolling Interest
	The following table reflects the changes in the Company's noncontrolling interest balance:
		(In millions)
	Balance as of December 31, 2013 (As previously reported)	$	382
	Net Assets of Acquired ROFO Assets as of December 31, 2013	241
	Balance as of December 31, 2013 (As currently reported)	623
	Payment to NRG for Acquired ROFO assets	(357		)
	Comprehensive income, including pre-acquisition net income from Acquired ROFO Assets	65
	Non-cash contributions	13
	Cash distributions, net of cash contributions	(65		)
	Balance as of September 30, 2014	$	279

Business_Acquisition_1_Tables

Business Acquisition 1 (Tables)	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Schedule of Components of Purchase Price	'
	The purchase price of $923 million was provisionally allocated as follows:
			(In millions)
	Assets
	Cash		$	22
	Current and non-current assets		49
	Property, plant and equipment		1,057
	Intangible assets		1,420
	Total assets acquired		2,548
	Liabilities
	Debt		1,591
	Current and non-current liabilities		34
	Total liabilities assumed		1,625
	Net assets acquired		$	923
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following is a summary of assets and liabilities transferred in connection with the acquisition:
		RE Kansas South			TA High Desert		El Segundo
		(In millions)
	Current assets	$	1		$	3	$	43
	Property, plant and equipment	50			67		625
	Non-current assets	2			13		76
	Total assets	53			83		744
	Debt	35			57		520
	Other current and non-current liabilities	2			—		30
	Total liabilities	37			57		550
	Net assets acquired	$	16		$	26	$	194
	The following table presents historical information summary combining the financial information for the Acquired ROFO Assets transferred in connection with the acquisition:
		December 31, 2013
		As Previously Reported			RE Kansas South		TA High Desert		El Segundo		As Currently Reported
					(In millions)
	Current assets	$	267		$	25	$	28	$	58	$	378
	Property, plant and equipment	1,541			51		63		636		2,291
	Non-current assets	505			3		10		51		569
	Total assets	2,313			79		101		745		3,238
	Debt	1,133			58		80		512		1,783
	Other current and non-current liabilities	169			5		3		26		203
	Total liabilities	$	1,302		$	63	$	83	$	538	$	1,986
Financial Information of Acquisition	'
		Three months ended September 30, 2013											Nine months ended September 30, 2013
		As Previously Reported			RE Kansas South		TA High Desert		El Segundo		As Currently Reported		As Previously Reported		RE Kansas South		TA High Desert		El Segundo		As Currently Reported
							(In millions)
	Operating revenues	$	95		$	2	$	3	$	26	$	126	$	227	$	2	$	6	$	26	$	261
	Operating income	45			2		3		13		63		95		2		4		12		113
	Net income	$	40		$	—	$	2	$	7	$	49	$	85	$	1	$	2	$	7	$	95

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Schedule of Property, Plant and Equipment	'
		September 30, 2014			31-Dec-13			Depreciable Lives
		(In millions)
	Facilities and equipment	$	3,487		$	2,411		5 - 40 Years
	Land and improvements	48			48
	Construction in progress	7			6
	Total property, plant and equipment	3,542			2,465
	Accumulated depreciation	(266		)	(174		)
	Net property, plant and equipment	$	3,276		$	2,291

Variable_Interest_Entities_or_1

Variable Interest Entities, or VIEs Variable Interest Entities, or VIEs (Tables)	9 Months Ended
	Sep. 30, 2014
Variable Interest Entities Disclosure [Abstract]	'
Summarized unaudited financial information for GCE Holdings LLC	'
	The following table presents summarized unaudited financial information for GCE Holdings LLC:
		Three months ended September 30,				Nine months ended September 30,
		2014		2013		2014		2013
	Income Statement Data:	(In millions)
	Operating revenues	$	18	$	21	$	62	$	60
	Operating income	10		11		30		34
	Net income	7		8		21		23
		September 30, 2014		December 31, 2013
	Balance Sheet Data:	(In millions)
	Current assets	$	26	$	32
	Non-current assets	442		453
	Current liabilities	15		18
	Non-current liabilities	224		231

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
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 September 30, 2014								As of December 31, 2013
		Carrying Amount				Fair Value				Carrying Amount		Fair Value
		(In millions)
	Assets:
	Notes receivable — affiliate	$	—			$	—			$	2	$	2
	Notes receivable, including current portion	23				23				27		27
	Liabilities:
	Long-term debt, including current portion	4,083				4,157				1,783		1,785
Assets and liabilities measured and recorded at fair value on the consolidated balance sheets on a recurring basis	'
	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 September 30, 2014
		Fair Value (a)
	(In millions)	Level 2				Level 3				Total
	Derivative assets:
	Commodity contracts	$	—			$	—			$	—
	Interest rate contracts	7				—				7
	Total assets	7				—				7
	Derivative liabilities:
	Commodity contracts	1				—				1
	Interest rate contracts	52				—				52
	Total liabilities	$	53			$	—			$	53
	(a) There were no assets or liabilities classified as Level 1 as of September 30, 2014.
		As of December 31, 2013
		Fair Value (a)
	(In millions)	Level 2				Level 3				Total
	Derivative assets:
	Commodity contracts	$	1			$	—			$	1
	Interest rate contracts	20				—				20
	Total assets	21				—				21
	Derivative liabilities:
	Commodity contracts	1				1				2
	Interest rate contracts	45				—				45
	Total liabilities	$	46			$	1			$	47
	(a) There were no assets or liabilities classified as Level 1 as of December 31, 2013.
Reconciliation of beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements at least annually using significant unobservable inputs	'
	The following table reconciles, for the three and nine months ended September 30, 2014, the beginning and ending balances for derivative instruments that are recognized at fair value in the consolidated financial statements, at least annually, using significant unobservable inputs:
			Fair Value Measurement Using Significant Unobservable Inputs - Derivatives (Level 3)
			Three months ended September 30,				Nine months ended September 30,
	(In millions)		2014				2014
	Beginning balance		$	(1	)		$	(1	)
	Included in earnings		1				1
	Ending balance as of September 30, 2014		$	—			$	—

Accounting_for_Derivative_Inst1

Accounting for Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2014
Accounting for 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/(sell) of the Company's open derivative transactions broken out by category as of September 30, 2014 and December 31, 2013.
			Total Volume
			September 30, 2014			December 31, 2013
	Category	Units	(In millions)
	Natural Gas	MMBtu	3			2
	Interest	Dollars	$	2,125		$	1,234
	The increase in the interest rate position was primarily the result of the interest rate swaps acquired with the Alta Wind Assets.
Fair value within the derivative instrument valuation on the balance sheets	'
	The following table summarizes the fair value within the derivative instrument valuation on the balance sheet:
		Fair Value
		Derivative Assets						Derivative Liabilities
		September 30, 2014			December 31, 2013			September 30, 2014			December 31, 2013
		(In millions)
	Derivatives Designated as Cash Flow Hedges:
	Interest rate contracts current	$	—		$	—		$	24		$	26
	Interest rate contracts long-term	5			14			18			16
	Total Derivatives Designated as Cash Flow Hedges	5			14			42			42
	Derivatives Not Designated as Cash Flow Hedges:
	Interest rate contracts current	—			—			5			3
	Interest rate contracts long-term	2			6			5			—
	Commodity contracts current	—			1			1			2
	Commodity contracts long-term	—			—			—			—
	Total Derivatives Not Designated as Cash Flow Hedges	2			7			11			5
	Total Derivatives	$	7		$	21		$	53		$	47
Offsetting of derivatives by counterparty master agreement level and collateral received or paid	'
	The following table summarizes the offsetting of derivatives by counterparty master agreement level:
		Gross Amounts Not Offset in the Statement of Financial Position
		Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
	As of September 30, 2014	(In millions)
	Commodity contracts:
	Derivative assets	$	—		$	—		$	—
	Derivative liabilities	(1		)	—			(1		)
	Total commodity contracts	(1		)	—			(1		)
	Interest rate contracts:
	Derivative assets	7			(5		)	2
	Derivative liabilities	(52		)	5			(47		)
	Total interest rate contracts	(45		)	—			(45		)
	Total derivative instruments	$	(46	)	$	—		$	(46	)
		Gross Amounts Not Offset in the Statement of Financial Position
	As of December 31, 2013	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
	Commodity contracts:	(In millions)
	Derivative assets	$	1		$	—		$	1
	Derivative liabilities	(2		)	—			(2		)
	Total commodity contracts	(1		)	—			(1		)
	Interest rate contracts:
	Derivative assets	20			(12		)	8
	Derivative liabilities	(45		)	12			(33		)
	Total interest rate contracts	(25		)	—			(25		)
	Total derivative instruments	$	(26	)	$	—		$	(26	)
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 other comprehensive loss, or OCL, balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax:
		Three months ended September 30,						Nine months ended September 30,
		2014			2013			2014			2013
		(In millions)						(In millions)
	Accumulated OCL beginning balance	$	(24	)	$	(19	)	$	—		$	(48	)
	Reclassified from accumulated OCL to income due to realization of previously deferred amounts	1			4			8			9
	Mark-to-market of cash flow hedge accounting contracts	6			1			(25		)	25
	Accumulated OCL ending balance, net of income tax benefit of $3 and $1, respectively	(17		)	(14		)	(17		)	(14		)
	Accumulated OCL attributable to NRG	(11		)	(6		)	(11		)	(6		)
	Accumulated OCL attributable to NRG Yield, Inc.	$	(6	)	$	(8	)	$	(6	)	$	(8	)

Longterm_Debt_Tables

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Schedule of Long-term Debt	'
	This footnote should be read in conjunction with the complete description under Note 9, Long - Term Debt, to the Company's 2013 Form 10-K. Long-term debt consisted of the following:
		September 30, 2014		December 31, 2013		Current interest rate % (a)
		(In millions, except rates)
	NRG Yield Inc. Convertible Senior Notes, due 2019 (b)	$	325	$	—	3.5
	NRG Yield LLC Senior Notes, due 2024	500		—		5.375
	Project-level debt:
	Alta Wind I, lease financing arrangement, due 2034	263		—		7.01
	Alta Wind II, lease financing arrangement, due 2034	207		—		5.7
	Alta Wind III, lease financing arrangement, due 2034	215		—		6.07
	Alta Wind IV, lease financing arrangement, due 2034	139		—		5.94
	Alta Wind V, lease financing arrangement, due 2035	222		—		6.07
	Alta Wind X, due 2020	300		—		L+2.00
	Alta Wind XI, due 2020	191		—		L+2.00
	Alta Realty Investments, due 2031	34		—		7
	Alta Wind Asset Management, due 2031	20		—		L+2.375
	NRG West Holdings LLC, due 2023	506		512		L+2.25 - 2.875
	NRG Marsh Landing LLC, due 2017 and 2023	477		473		L+ 1.75 - 1.875
	NRG Solar Alpine LLC, due 2022	166		221		L+2.50/L+1.75
	NRG Energy Center Minneapolis LLC, due 2017 and 2025	122		127		5.95 - 7.25
	NRG Solar Borrego LLC, due 2024 and 2038	76		78		L+ 2.50/5.65
	South Trent Wind LLC, due 2020	66		69		L+2.75
	NRG Solar Avra Valley LLC, due 2031	64		63		L+ 1.75
	TA High Desert LLC, due 2023 and 2033	57		80		L+2.50/5.15
	NRG Roadrunner LLC, due 2031	42		44		L+ 2.01
	NRG Solar Kansas South LLC, due 2031	36		58		L+2.00
	NRG Solar Blythe LLC, due 2028	23		24		L+ 2.75
	PFMG and related subsidiaries financing agreement, due 2030	31		32		6
	NRG Energy Center Princeton LLC, due 2017	1		2		5.95
	Subtotal project-level debt:	3,258		1,783
	Total debt	4,083		1,783
	Less current maturities	157		214
	Total long-term debt	$	3,926	$	1,569

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Reconciliation of NRG's basic earnings per share to diluted earnings per share	'
	The reconciliation of the Company's basic and diluted earnings per share is shown in the following table:
		Three months ended September 30,		Nine months ended September 30,		Period from July 23, 2013 to September 30,
		2014		2014		2013
	(In millions, except per share data)
	Basic and diluted earnings per share attributable to Class A common stockholders
	Net Income Attributable to NRG Yield, Inc.	$	6	$	16	$	9
	Weighted average number of Class A common shares outstanding	31		25		23
	Basic and Diluted Earnings per Class A common share	$	0.2	$	0.62	$	0.39

Changes_in_Capital_Structure_T

Changes in Capital Structure (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Dividends Paid	'
	The following table lists the dividends paid on the Company's Class A common stock during the nine months ended September 30, 2014:
		Third Quarter 2014		Second Quarter 2014		First Quarter 2014
	Dividends per share	$	0.365	$	0.35	$	0.33

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Schedule of Segment Reporting Information, by Segment	'
		Three months ended September 30, 2014
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	65		$	48		$	48		$	—		$	161
	Cost of operations	9			11			32			—			52
	Depreciation and amortization	15			14			5			—			34
	General and administrative — affiliate	—			—			—			3			3
	Acquisition-related transaction and integration costs	—			—			—			2			2
	Operating income (loss)	41			23			11			(5		)	70
	Equity in earnings of unconsolidated affiliates	4			7			—			—			11
	Other income, net	—			—			—			1			1
	Interest expense	(11		)	(19		)	(2		)	(9		)	(41		)
	Income (loss) before income taxes	34			11			9			(13		)	41
	Net Income (Loss)	34			11			9			(23		)	31
	Total Assets	$	1,526		$	3,413		$	434		$	526		$	5,899
		Three months ended September 30, 2013
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	57		$	29		$	40		$	—		$	126
	Cost of operations	13			3			28			—			44
	Depreciation and amortization	7			7			4			—			18
	General and administrative — affiliate	—			—			—			1			1
	Operating income (loss)	37			19			8			(1		)	63
	Equity in earnings of unconsolidated affiliates	5			7			—			—			12
	Interest expense	(10		)	(9		)	(2		)	—			(21		)
	Income (loss) before income taxes	32			17			6			(1		)	54
	Net Income (Loss)	$	32		$	17		$	6		$	(6	)	$	49
		Nine months ended September 30, 2014
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	182		$	97		$	156		$	—		$	435
	Cost of operations	31			18			108			—			157
	Depreciation and amortization	51			29			14			—			94
	General and administrative — affiliate	—			—			—			7			7
	Acquisition-related transaction and integration costs	—			—			—			2			2
	Operating income (loss)	100			50			34			(9		)	175
	Equity in earnings of unconsolidated affiliates	11			15			—			—			26
	Other income, net	—			1			—			1			2
	Interest expense	(33		)	(41		)	(6		)	(17		)	(97		)
	Income (loss) before income taxes	78			25			28			(25		)	106
	Net Income (Loss)	78			25			28			(40		)	91
		Nine months ended September 30, 2013
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	77		$	71		$	113		$	—		$	261
	Cost of operations	16			8			81			—			105
	Depreciation and amortization	9			18			11			—			38
	General and administrative — affiliate	—			—			—			5			5
	Operating income (loss)	52			45			21			(5		)	113
	Equity in earnings of unconsolidated affiliates	12			6			—			—			18
	Interest expense	(13		)	(13		)	(6		)	—			(32		)
	Other income, net	1			—			—			—			1
	Income (loss) before income taxes	52			38			15			(5		)	100
	Net Income (Loss)	$	52		$	38		$	15		$	(10	)	$	95

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Effective tax rate	'
	Effective Tax Rate
	The income tax provision consisted of the following:
		Three months ended September 30,						Nine months ended September 30,
	(In millions, except otherwise noted)	2014			2013			2014			2013
	Income before income taxes	$	41		$	54		$	106		$	100
	Income tax expense	10			5			15			5
	Effective tax rate	24.4		%	9.3		%	14.2		%	5		%

Nature_of_Business_Nature_of_B1

Nature of Business Nature of Business (Details) (USD $)

2 Months Ended

3 Months Ended

7 Months Ended

9 Months Ended

1 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Jul. 22, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jul. 31, 2013

Jul. 31, 2013

Jul. 29, 2014

Jul. 22, 2013

Sep. 30, 2014

Sep. 30, 2013

Jul. 29, 2014

Jun. 30, 2014

Jul. 29, 2014

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Jul. 29, 2014

Jul. 22, 2013

Jul. 22, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jun. 30, 2014

MW

MW

Conventional

Utility-Scale Solar

Distributed Solar

Wind

Thermal

NRG

NRG Yield LLC [Member]

Public Shareholders

Public Shareholders

Public Shareholders

Public Shareholders

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

GenConn Middletown

GenConn Devon

Marsh Landing

El Segundo [Member]

Alpine

Avenal [Member]

Avra Valley

Blythe

Borrego

Roadrunner

RE Kansas South [Member]

TA - High Desert LLC [Member]

CVSR

AZ DG Solar Projects

PFMG DG Solar Projects

Alta I [Member]

Alta II [Member]

Alta III [Member]

Alta IV [Member]

Alta V [Member]

Alta X [Member]

Alta XI [Member]

South Trent

Drop-down Acquisition [Member]

MW

MW

MW

MW

MW

Common Class A

Common Class A

Common Class A

Common Class A

NRG Yield, Inc. [Member]

NRG Yield, Inc. [Member]

NRG

NRG

NRG

NRG

NRG

NRG

Class A units of NRG Yield LLC

Conventional

Conventional

Conventional

Conventional

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Distributed Solar

Distributed Solar

Wind

Wind

Wind

Wind

Wind

Wind

Wind

Wind

Class A units of NRG Yield LLC

Class A units of NRG Yield LLC

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

Nature of Business

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

118

'

'

118

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Allocation of Corporate Expenses

'

'

'

$4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Document Period End Date

'

'

'

'

30-Sep-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

General and administrative b affiliate

1

3

1

[1]

'

7

5

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Number of Shares Issued in Transaction

'

'

'

'

'

'

'

'

'

'

'

'

'

12,075,000

22,511,250

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Number of Shares Acquired in Transaction

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,075,000

19,011,250

3,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Interest in Subsidiaries and Affiliates

'

'

'

'

'

'

'

'

'

'

'

395

73

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for Underwriting Expense

'

'

'

'

'

'

'

'

'

'

'

'

'

630

'

630

468

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

44.70%

34.50%

55.30%

65.50%

55.30%

65.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of Ownership

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

49.95%

49.95%

100.00%

100.00%

100.00%

49.95%

100.00%

100.00%

100.00%

100.00%

100.00%

100.00%

48.95%

[2]

100.00%

51.00%

100.00%

100.00%

100.00%

100.00%

100.00%

100.00%

100.00%

100.00%

'

Power Generation Capacity (in MWs)

'

2,984

[3]

'

'

2,984

[3]

'

1,460

[3]

343

[3]

10

[3]

1,048

[3]

123

[3]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

95

[3]

95

[3]

720

[3]

550

[3]

66

[3]

23

[3]

25

[3]

21

[3]

26

[3]

20

[3]

20

[3]

20

[3]

122

[2],[3]

5

[3]

5

[3]

150

[3]

150

[3]

150

[3]

102

[3]

168

[3]

137

[3]

90

[3]

101

[3]

'

Steam and Chilled Water Capacity, Megawatts Thermal Equivalent

'

'

'

'

'

'

'

'

'

'

1,346

[2],[3]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisitions, Consideration Transferred, Purchase Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$357

[1]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

[2]

(b) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 118 MWt which is available under the right-to-use provisions contained in agreements between two of NRG Yield Inc.'s thermal facilities and certain of their customers

[3]

Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of SeptemberB 30, 2014.

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 15, 2014

Jun. 16, 2014

Mar. 17, 2014

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Noncontrolling Interest [Member]

Common Class B

Common Class B

Common Class B

Scenario, Previously Reported [Member]

ROFO [Member]

TA High Desert, RE Kansas South, and El Segundo Energy Center [Member]

NRG

Noncontrolling Interest [Member]

Noncontrolling Interest [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized Tax Benefits

'

$0

'

'

'

$0

'

'

'

'

'

'

'

'

'

'

Noncontrolling interest

'

279,000,000

'

'

'

279,000,000

'

623,000,000

[1]

'

'

'

'

382,000,000

'

'

'

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

'

'

'

'

'

'

'

3,238,000,000

'

'

'

'

2,313,000,000

241,000,000

'

'

Payment to NRG for Acquired ROFO Assets

'

'

'

'

'

-357,000,000

0

[1]

'

'

'

'

'

'

'

'

'

Less: Comprehensive income attributable to NRG

'

30,000,000

'

'

28,000,000

48,000,000

38,000,000

'

65,000,000

'

'

'

'

'

'

'

Non-cash adjustment to non-controlling interest

'

'

'

'

'

'

'

'

13,000,000

'

'

'

'

'

'

'

Cash distributions, net of cash contributions

'

'

'

'

'

'

'

'

-65,000,000

'

'

'

'

'

'

'

Dividends

'

$0.37

$0.35

$0.33

$0

$1.04

$0

'

'

$0.37

$0.35

$0.33

'

'

'

'

Dividends Payable, Date to be Paid

15-Dec-14

15-Sep-14

16-Jun-14

17-Mar-14

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized

'

'

'

'

'

'

'

'

'

'

'

'

'

'

113,000,000

'

Distributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$24,000,000

[1]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

Business_Acquisition_Details

Business Acquisition (Details) (USD $)

3 Months Ended

9 Months Ended

0 Months Ended

2 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Millions, except Share data, unless otherwise specified

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Aug. 12, 2014

Dec. 31, 2013

Sep. 30, 2014

Aug. 12, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Aug. 12, 2014

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Aug. 12, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Aug. 05, 2014

Aug. 05, 2014

Dec. 31, 2013

Jul. 29, 2014

Jul. 22, 2013

Jul. 30, 2014

Jul. 29, 2014

Jul. 29, 2014

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2013

MW

MW

GenConn Energy LLC

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

RE Kansas South [Member]

RE Kansas South [Member]

RE Kansas South [Member]

RE Kansas South [Member]

TA - High Desert LLC [Member]

TA - High Desert LLC [Member]

TA - High Desert LLC [Member]

TA - High Desert LLC [Member]

El Segundo [Member]

El Segundo [Member]

El Segundo [Member]

El Segundo [Member]

Alta Wind Holdings [Member]

Drop-down Acquisition [Member]

Drop-down Acquisition [Member]

Energy Systems Company [Member]

5.375% Senior Notes due in 2024 [Member]

5.375% Senior Notes due in 2024 [Member]

5.375% Senior Notes due in 2024 [Member]

Customer Contracts [Member]

Public Shareholders

Public Shareholders

Public Shareholders

Public Shareholders

NRG [Member]

NRG [Member]

NRG [Member]

NRG [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

MW

MW

NRG Yield Operating LLC [Member]

NRG Yield Operating LLC [Member]

Energy Systems Company [Member]

Common Class A

Common Class A

Common Class A

Common Class A

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

Alta Wind Portfolio [Member]

Business Acquisition

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date to be Paid

15-Dec-14

15-Sep-14

16-Jun-14

17-Mar-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$22

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Pro Forma Revenue

'

'

'

'

'

'

'

'

'

'

'

'

551

385

562

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Pro Forma Net Income(Loss), Including Portion Attributable to Noncontrolling Interest

'

'

'

'

'

'

'

'

'

'

'

'

67

99

110

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Number of Shares Issued in Transaction

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,075,000

22,511,250

'

12,075,000

'

'

'

'

'

'

'

Share Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$54

'

'

'

'

'

'

'

'

Business Combination, Consideration Transferred

'

'

'

'

'

'

'

'

'

'

870

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

349

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Current assets

'

'

'

'

'

'

'

'

378

'

'

'

'

'

'

'

'

'

1

25

'

'

3

28

'

'

43

58

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

267

Property, plant and equipment

'

'

'

'

'

'

'

'

2,291

'

'

'

'

'

'

1,057

'

'

50

51

'

'

67

63

'

'

625

636

'

'

'

60

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,541

Non-current assets

'

'

'

'

'

'

'

'

569

'

'

'

'

'

'

'

'

'

2

3

'

'

13

10

'

'

76

51

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

505

Total assets

'

'

'

'

'

'

'

'

3,238

'

'

'

'

'

'

2,548

'

'

53

79

'

'

83

101

'

'

744

745

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,313

Debt

'

'

'

'

'

'

'

'

1,783

'

'

'

'

'

'

'

'

'

35

58

'

'

57

80

'

'

520

512

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,133

Other current and non-current liabilities

'

'

'

'

'

'

'

'

203

'

'

'

'

'

'

'

'

'

2

5

'

'

0

3

'

'

30

26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

169

Total liabilities

'

'

'

'

'

'

'

'

1,986

'

'

'

'

'

'

1,625

'

'

37

63

'

'

57

83

'

'

550

538

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,302

Net assets acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

923

'

'

16

'

'

'

26

'

'

'

194

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Consideration Transferred, Working Capital

'

'

'

'

'

'

'

53

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance of Senior Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.38%

'

5.38%

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Businesses, Gross

'

'

'

'

'

'

'

'

'

'

923

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

120

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Acquisition Related Costs

'

2

'

'

0

2

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual

'

'

'

'

'

'

'

'

'

'

'

18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual

'

'

'

'

'

'

'

'

'

'

'

7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

55.30%

65.50%

55.30%

65.50%

'

'

'

Power Generation Capacity (in MWs)

'

2,984

[1]

'

'

'

2,984

[1]

'

'

'

190

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

947

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,420

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

59

'

'

'

'

'

'

'

'

'

'

'

Working Capital

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisitions, Consideration Transferred, Purchase Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

357

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Consideration Transferred, Liabilities Incurred

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

612

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total operating revenues

'

161

'

'

126

[2]

435

261

[2]

'

'

'

'

'

'

'

'

'

2

2

'

'

3

6

'

'

26

26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

95

227

'

Operating Income (Loss)

'

70

'

'

63

175

113

[2]

'

'

'

'

'

'

'

'

'

2

2

'

'

3

4

'

'

13

12

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

45

95

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current and Non-Current Assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

49

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,591

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current and Non-Current Liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

34

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Pro Forma Net Income (Loss)

'

'

'

'

'

'

'

'

'

'

'

'

16

12

11

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss)

'

$31

'

'

$49

[2]

$91

$95

[2]

'

'

'

'

'

'

'

'

'

$0

$1

'

'

$2

$2

'

'

$7

$7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$40

$85

'

Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted

'

'

'

'

'

'

'

'

'

'

'

'

$0.47

$0.33

$0.31

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of SeptemberB 30, 2014.

[2]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)

9 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

16-May-13

Sep. 30, 2014

Sep. 30, 2013

16-May-13

Sep. 30, 2014

Sep. 30, 2013

16-May-13

Sep. 30, 2014

Sep. 30, 2014

Facilities and equipment

Facilities and equipment

Construction in progress

Construction in progress

Borrego

Borrego

Borrego

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

Minimum [Member]

Maximum [Member]

Facilities and equipment

Facilities and equipment

Property, Plant and Equipment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total property, plant and equipment

$3,542

'

$2,465

[1]

$3,487

$2,411

$7

$6

'

'

'

'

'

'

'

'

'

'

'

Land and Land Improvements

48

'

48

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated depreciation

-266

'

-174

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net property, plant and equipment

3,276

'

2,291

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Renewable energy grant, gross

'

'

'

'

'

'

'

'

'

39

'

'

25

'

'

23

'

'

Renewable energy grants, net

'

'

'

'

'

'

'

'

36

'

'

'

'

'

21

'

'

'

Deferred Tax Assets, Deferred Income

'

'

'

'

'

'

'

'

'

'

'

6

'

'

6

'

'

'

Deferred tax asset, renewable energy grant

'

'

'

'

'

'

'

'

10

'

'

'

'

'

'

'

'

'

Property, plant and equipment, useful life

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'40 years

Payments for (Proceeds from) Other Investing Activities

($11)

$0

[1]

'

'

'

'

'

$30

'

'

$20

'

'

$21

'

'

'

'

[1]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable_Interest_Entities_or_2

Variable Interest Entities, or VIEs (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2010

Jun. 30, 2011

Sep. 30, 2014

Sep. 30, 2014

MW

MW

GCE Holdings LLC

GCE Holdings LLC

GCE Holdings LLC

GCE Holdings LLC

GCE Holdings LLC

GenConn Energy LLC

GenConn Energy LLC

GenConn Devon

GenConn Middletown

Fixed Rate Notes

Working Capital Facility

MW

GenConn Energy LLC

GenConn Energy LLC

GenConn Energy LLC

GenConn Energy LLC

facility

generatingunit

generatingunit

Variable Interest Entity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Economic interest in equity method investments (as a percent)

'

'

'

'

'

49.95%

'

49.95%

'

'

'

'

'

'

'

'

Power generation units

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

Power Generation Capacity (in MWs)

2,984

[1]

'

2,984

[1]

'

'

'

'

'

'

'

'

190

'

'

'

'

Number of Units Reached Commercial Operation at Peaking Generation Facilities

'

'

'

'

'

'

'

'

'

'

'

'

4

4

'

'

Equity investments in affiliates

$230

'

$230

'

$227

[2]

'

'

'

'

'

$114

'

'

'

'

'

Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

228

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.73%

1.88%

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35

Operating revenues

161

126

[2]

435

261

[2]

'

18

21

62

60

'

'

'

'

'

'

'

Operating income

70

63

175

113

[2]

'

10

11

30

34

'

'

'

'

'

'

'

Net Income (Loss)

31

49

[2]

91

95

[2]

'

7

8

21

23

'

'

'

'

'

'

'

Current assets

555

'

555

'

378

[2]

26

'

26

'

32

'

'

'

'

'

'

Non-current assets

2,068

'

2,068

'

569

[2]

442

'

442

'

453

'

'

'

'

'

'

Current liabilities

302

'

302

'

369

[2]

15

'

15

'

18

'

'

'

'

'

'

Non-current liabilities

$3,983

'

$3,983

'

$1,617

[2]

$224

'

$224

'

$231

'

'

'

'

'

'

[1]

Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of SeptemberB 30, 2014.

[2]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

Fair_Value_of_Financial_Instru2

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

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Interest rate contracts

Interest rate contracts

Commodity contracts

Commodity contracts

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Non-affiliate

Non-affiliate

Carrying Amount

Carrying Amount

Carrying Amount

Carrying Amount

Carrying Amount

Carrying Amount

Fair Value

Fair Value

Fair Value

Fair Value

Fair Value

Fair Value

Derivative [Member]

Derivative [Member]

Derivative [Member]

Derivative [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Interest rate contracts

Interest rate contracts

Commodity contracts

Commodity contracts

Affiliate

Affiliate

Non-affiliate

Non-affiliate

Affiliate

Affiliate

Non-affiliate

Non-affiliate

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Interest rate contracts

Interest rate contracts

Commodity contracts

Commodity contracts

Interest rate contracts

Interest rate contracts

Commodity contracts

Commodity contracts

Fair Value of Financial Instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Fair Value, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

$0

Financing Receivable, Gross

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

2,000,000

23,000,000

27,000,000

'

'

0

2,000,000

23,000,000

27,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Assets

7,000,000

[1]

'

7,000,000

[1]

21,000,000

[1]

7,000,000

20,000,000

0

1,000,000

'

'

7,000,000

[1]

20,000,000

[1]

0

[1]

1,000,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,000,000

[1]

21,000,000

[1]

'

'

7,000,000

[1]

20,000,000

[1]

0

[1]

1,000,000

[2]

0

[1]

0

[1]

0

[1]

0

[1]

0

[1]

0

[1]

'

'

Derivative Liabilities

53,000,000

'

53,000,000

47,000,000

52,000,000

45,000,000

1,000,000

2,000,000

53,000,000

[1]

47,000,000

[1]

52,000,000

[1]

45,000,000

[1]

1,000,000

[1]

2,000,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

53,000,000

[1]

46,000,000

[1]

52,000,000

[1]

45,000,000

[1]

1,000,000

[1]

1,000,000

[1]

0

[1]

1,000,000

[1]

0

[1]

0

[1]

0

[1]

1,000,000

[1]

'

'

Fair Value, Assets And Liabilities, Level 1 to Level 2 Transfers, Amount

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

-1,000,000

-1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Purchases

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000,000

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Concentration of Credit Risk

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit risk exposure under certain long-term agreements for the next five years

'

'

1,700,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period of credit risk exposure under certain long-term agreements (in years)

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$4,083,000,000

$1,783,000,000

$4,083,000,000

$1,783,000,000

'

'

'

'

$4,157,000,000

$1,785,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

(a) There were no assets or liabilities classified as Level 1 as of SeptemberB 30, 2014.

[2]

(a) There were no assets or liabilities classified as Level 1 as of December 31, 2013.

Accounting_for_Derivative_Inst2

Accounting for Derivative Instruments and Hedging Activities (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Reclassification out of Accumulated Other Comprehensive Income

Reclassification out of Accumulated Other Comprehensive Income

Reclassification out of Accumulated Other Comprehensive Income

Reclassification out of Accumulated Other Comprehensive Income

Derivatives Designated as Cash Flow Hedges

Derivatives Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Interest rate contracts current

Interest rate contracts current

Interest rate contracts current

Interest rate contracts current

Interest rate contracts long-term

Interest rate contracts long-term

Interest rate contracts long-term

Interest rate contracts long-term

Commodity contracts current

Commodity contracts current

Commodity Contract Non Current [Member]

Commodity Contract Non Current [Member]

Commodity contracts

Commodity contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

MMbtu

MMbtu

Dollars

Dollars

Noncontrolling Interest [Member]

Noncontrolling Interest [Member]

NRG Yield, Inc. [Member]

NRG Yield, Inc. [Member]

Derivatives Designated as Cash Flow Hedges

Derivatives Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Designated as Cash Flow Hedges

Derivatives Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Natural Gas

Natural Gas

Interest

Interest

Derivative

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Underlying, Derivative

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,000,000

2,000,000

'

'

'

'

'

'

Derivative, Notional Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$2,125

$1,234

'

'

'

'

Fair Value of Derivative Instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Assets

7

[1]

'

7

[1]

'

21

[1]

'

'

'

'

5

14

2

7

0

0

0

0

5

14

2

6

'

1

'

0

0

1

7

'

7

'

20

'

'

'

'

'

'

'

'

Derivative Liabilities

-53

'

-53

'

-47

'

'

'

'

-42

-42

-11

-5

-24

-26

-5

-3

-18

-16

-5

0

-1

-2

0

0

-1

-2

-52

'

-52

'

-45

'

'

'

'

'

'

'

'

Fair Value of Gross Derivative Assets/(Liabilities), Net

-46

'

-46

'

-26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1

-1

-45

'

-45

'

-25

'

'

'

'

'

'

'

'

Derivative Liability, Fair Value, Gross Asset

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

5

'

5

'

12

'

'

'

'

'

'

'

'

Derivative, Collateral, Right to Reclaim Cash

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1

-2

-47

'

-47

'

-33

'

'

'

'

'

'

'

'

Derivative Asset, Fair Value, Gross Liability

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

-5

'

-5

'

-12

'

'

'

'

'

'

'

'

Derivative Asset

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

1

2

'

2

'

8

'

'

'

'

'

'

'

'

Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset

0

'

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

0

'

0

'

0

'

'

'

'

'

'

'

'

Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral

-46

'

-46

'

-26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1

-1

-45

'

-45

'

-25

'

'

'

'

'

'

'

'

Accumulated Other Comprehensive Income (Loss), Net of Tax

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated OCL beginning balance

-24

-19

0

-48

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-6

-8

Reclassified from accumulated OCL to income due to realization of previously deferred amounts

31

49

[2]

91

95

[2]

'

1

4

8

9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mark-to-market of cash flow hedge accounting contracts

6

1

-25

25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated OCL ending balance, net of income tax benefit of $3 and $1, respectively

-17

-14

-17

-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-6

-8

Accumulated OCL attributable to NRG

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-11

-6

'

'

Accumulated OCI ending balance, income tax of $---- and $15, respectively

3

1

3

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss expected to be realized from OCI during the next 12 months, net of tax

'

'

12

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss expected to be realized from OCI during the next 12 months, tax

2

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Summary of Derivative Instruments Impact on Results of Operations

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrealized gain/(loss) on derivatives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

$1

($6)

$10

'

'

'

'

'

'

'

'

'

[1]

(a) There were no assets or liabilities classified as Level 1 as of SeptemberB 30, 2014.

[2]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

Longterm_Debt_Details

Long-term Debt (Details) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

0 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

1 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

1 Months Ended

9 Months Ended

60 Months Ended

144 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Feb. 11, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Jul. 09, 2014

Sep. 30, 2014

Jul. 09, 2014

Aug. 31, 2011

Sep. 30, 2014

Aug. 23, 2011

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2013

Mar. 16, 2012

Mar. 31, 2014

Mar. 31, 2013

Jan. 15, 2013

Mar. 16, 2012

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Mar. 31, 2014

Jun. 24, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2013

Mar. 31, 2013

Apr. 30, 2014

Mar. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Apr. 25, 2014

Sep. 30, 2014

Sep. 30, 2014

Feb. 11, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Aug. 31, 2011

Sep. 30, 2014

Aug. 23, 2011

Sep. 30, 2014

Aug. 23, 2011

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jul. 17, 2014

Jul. 17, 2014

Sep. 30, 2014

Jul. 17, 2014

Jul. 17, 2014

Sep. 30, 2014

Jul. 17, 2014

Jul. 17, 2014

Sep. 30, 2014

Mar. 31, 2013

Sep. 30, 2014

Sep. 30, 2019

Sep. 30, 2031

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Aug. 05, 2014

Aug. 05, 2014

Sep. 30, 2014

Sep. 30, 2014

Apr. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Aug. 31, 2011

Aug. 31, 2011

Sep. 30, 2014

Sep. 30, 2014

Aug. 31, 2011

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

MW

MW

Affiliate

Affiliate

Non-affiliate

Non-affiliate

Lease Financing Arrangement [Member]

Notes Payable, Other Payables [Member]

Letter of Credit [Member]

Term Loan Facility [Member]

NRG Yield, Inc. [Member]

Alta Wind X, due 2020 [Member]

Alta Wind X, due 2020 [Member]

Alta Wind X, due 2020 [Member]

Alta Wind X, due 2020 [Member]

TA - High Desert, due 2023 [Member]

High Desert Facility, due 2023 [Member]

Avra Valley

Avra Valley

Avra Valley

Avra Valley

Avra Valley

Avra Valley

West Holdings Credit Agreement [Member]

West Holdings Credit Agreement [Member]

West Holdings Credit Agreement [Member]

West Holdings Credit Agreement [Member]

West Holdings Credit Agreement [Member]

NRG Marsh Landing LLC, due 2017 and 2023

NRG Marsh Landing LLC, due 2017 and 2023

NRG Marsh Landing LLC, due 2017

NRG Marsh Landing LLC, due 2017

Marsh Landing Term Loan Due 2023 [Member]

Marsh Landing Term Loan Due 2023 [Member]

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine, due 2022

NRG Solar Alpine, due 2022

NRG Solar Alpine, due 2022

Alpine

Alpine

Alpine

NRG Energy Center Minneapolis LLC, senior secured notes, due 2013, 2017, and 2025

NRG Energy Center Minneapolis LLC, senior secured notes, due 2013, 2017, and 2025

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

NRG Energy Center Minneapolis LLC, senior secured notes, due 2025

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

TA - High Desert LLC [Member]

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Borrego I LLC, due 2024

NRG Borrego I LLC, due 2024

NRG Borrego I LLC, due 2038

Alta Realty Investments, due 2031 [Member]

Alta Realty Investments, due 2031 [Member]

Alta Wind Asset Management, due 2031 [Member]

Alta Wind Asset Management, due 2031 [Member]

Alta Wind Asset Management, due 2031 [Member]

South Trent Wind LLC, due 2020

South Trent Wind LLC, due 2020

South Trent Wind LLC, due 2020

South Trent Wind LLC, due 2020

NRG Roadrunner LLC, due 2031

NRG Roadrunner LLC, due 2031

NRG Roadrunner LLC, due 2031

NRG Roadrunner LLC, due 2031

Kansas South Facility, due 2031 [Member]

Kansas South Facility, due 2031 [Member]

NRG Solar Blythe LLC, due 2028

NRG Solar Blythe LLC, due 2028

NRG Solar Blythe LLC, due 2028

NRG Solar Blythe LLC, due 2028

PFMG and related subsidiaries, due 2030

PFMG and related subsidiaries, due 2030

PFMG and related subsidiaries, due 2030

NRG Energy Center Princeton LLC, due 2017 [Member]

NRG Energy Center Princeton LLC, due 2017 [Member]

NRG Energy Center Princeton LLC, due 2017 [Member]

NRG Yield Revolving Credit Facility

NRG Yield Revolving Credit Facility

NRG Yield LLC [Member]

Convertible Debt [Member]

Convertible Debt [Member]

5.375% Senior Notes due in 2024 [Member]

5.375% Senior Notes due in 2024 [Member]

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Project [Domain]

Project [Domain]

West Holdings Credit Agreement Tranche A [Member]

West Holdings Credit Agreement Tranche A [Member]

West Holdings Credit Agreement Tranche A [Member]

West Holdings Credit Agreement Tranche B [Member]

West Holdings Credit Agreement Tranche B [Member]

West Holdings PPA [Member]

West Holding Collateral Agent [Member]

West Holdings Working Capital Facility [Member]

West Holdings Working Capital Facility [Member]

Marsh Landing

Marsh Landing

Marsh Landing Tranche A [Member]

Marsh Landing Tranche A due December 2017 [Member]

Marsh Landing Tranche A After December 2017 [Member]

Marsh Landing Tranche B [Member]

Marsh Landing Tranche B due December 2017 [Member]

Marsh Landing Tranche B After December 2017 [Member]

Kansas South Facility [Member]

Kansas South Facility [Member]

Kansas South Facility [Member]

Kansas South Facility [Member]

Kansas South Facility [Member]

Alta Wind XI, due 2020 [Member]

Alta Wind XI, due 2020 [Member]

Alta Wind XI, due 2020 [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

Alta Wind Portfolio [Member]

NRG Yield Operating LLC [Member]

NRG Yield Operating LLC [Member]

Kansas South [Member]

Borrego

NRG

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

December 30, 2034 [Member]

December 30, 2034 [Member]

December 30, 2034 [Member]

December 30, 2034 [Member]

May 20, 2018 [Member]

April 13, 2018 [Member]

December 31, 2017 [Member]

January 5, 2016 [Member]

January 31, 2031 [Member]

May 15, 2031 [Member]

May 15, 2031 [Member]

March 31, 2020 [Member]

March 31, 2020 [Member]

March 31, 2020 [Member]

June 30, 2035 [Member]

June 13, 2018 [Member]

December 31, 2020 [Member]

December 31, 2020 [Member]

December 31, 2013 [Member]

December 31, 2013 [Member]

December 31, 2013 [Member]

December 31, 2013 [Member]

December 31, 2015 [Member]

December 31, 2015 [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Convertible Debt [Member]

Non-affiliate

Non-affiliate

Letter of Credit [Member]

Term Loan Facility [Member]

Non-affiliate

Non-affiliate

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Construction Loans [Member]

Construction Loans [Member]

Cash Grant Loan [Member]

Cash Grant Loan [Member]

Cash Grant Loan [Member]

Cash Grant Loan [Member]

Non-affiliate

Non-affiliate

Term Loan Facility [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Non-affiliate

Non-affiliate

Non-affiliated Entity [Member]

Non-affiliated Entity [Member]

Fixed Rate Notes

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Bridge Loan [Member]

Bridge Loan [Member]

Fixed Rate Notes

Revolving Credit Facility [Member]

Bridge Loan [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Notes Payable, Other Payables [Member]

Non-affiliate

Non-affiliate

Term Loan Facility [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Revolving Credit Facility [Member]

Non-affiliate

Lease Financing Arrangement [Member]

Letter of Credit [Member]

Non-affiliate

Lease Financing Arrangement [Member]

Letter of Credit [Member]

Non-affiliate

Lease Financing Arrangement [Member]

Letter of Credit [Member]

Non-affiliate

Lease Financing Arrangement [Member]

Letter of Credit [Member]

Non-affiliate

Lease Financing Arrangement [Member]

Letter of Credit [Member]

Non-affiliate

Non-affiliate

Letter of Support of Debt Service [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Non-affiliate

Non-affiliate

Term Loan Facility [Member]

Alta Wind X, due 2020 [Member]

Alta Wind X, due 2020 [Member]

Alta Wind Asset Management, due 2031 [Member]

Alta Wind Asset Management, due 2031 [Member]

Alta Wind XI, due 2020 [Member]

Alta Wind XI, due 2020 [Member]

5.375% Senior Notes due in 2024 [Member]

5.375% Senior Notes due in 2024 [Member]

High Desert Facility [Member]

West Holdings Credit Agreement [Member]

Alpine

Kansas South [Member]

West Holdings Credit Agreement Tranche B [Member]

West Holdings Credit Agreement [Member]

Alpine

West Holdings Credit Agreement Tranche B [Member]

Alta Wind X, due 2020 [Member]

Alta Wind Asset Management, due 2031 [Member]

Alta Wind XI, due 2020 [Member]

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

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

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

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

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

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

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

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

Alta Realty Investments, due 2031 [Member]

Alta Wind Asset Management, due 2031 [Member]

Interest Rate Swap [Member]

Alta Wind X, due 2020 [Member]

Alta Wind X, due 2020 [Member]

Alta Wind XI, due 2020 [Member]

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

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

December 31, 2025 [Member]

December 31, 2025 [Member]

December 31, 2015 [Member]

December 31, 2015 [Member]

December 31, 2025 [Member]

December 31, 2025 [Member]

December 31, 2020 [Member]

December 31, 2020 [Member]

Non-affiliate

LIBOR Floor [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Term Loan Facility [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Bridge Loan [Member]

Lease Financing Arrangement [Member]

Lease Financing Arrangement [Member]

Lease Financing Arrangement [Member]

Lease Financing Arrangement [Member]

Letter of Credit [Member]

Letter of Credit [Member]

Letter of Credit [Member]

Letter of Credit [Member]

Notes Payable, Other Payables [Member]

Term Loan Facility [Member]

Alta Wind Asset Management, due 2031 [Member]

Letter of Credit [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Lease Financing Arrangement [Member]

Letter of Credit [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

London Interbank Offered Rate (LIBOR) [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Alta Wind X, due 2020 [Member]

Alta Wind XI, due 2020 [Member]

Alta Wind X, due 2020 [Member]

Alta Wind XI, due 2020 [Member]

Alta Wind X, due 2020 [Member]

Alta Wind XI, due 2020 [Member]

Alta Wind X, due 2020 [Member]

Alta Wind XI, due 2020 [Member]

Long-term Debt Disclosure

'

'

'

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'

'

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'

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'

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'

'

'

'

'

'

'

Percentage of Debt Hedged by Interest Rate Derivatives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

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'

'

'

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'

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'

'

'

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'

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'

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'

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'

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'

'

'

'

'

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'

'

'

'

'

'

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'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

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'

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'

'

'

'

'

'

'

100.00%

100.00%

100.00%

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible Debt, Fair Value Disclosures

$325,000,000

$325,000,000

'

$0

'

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'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

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'

'

'

'

'

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'

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'

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'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible Debt

'

'

'

'

'

'

'

'

'

'

'

'

345,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

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'

'

'

'

'

'

'

'

'

'

'

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'

'

'

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'

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'

'

'

'

'

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'

'

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'

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'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt

'

'

'

'

'

'

4,083,000,000

1,783,000,000

1,046,000,000

34,000,000

112,000,000

511,000,000

'

'

'

5,000,000

0

'

'

'

64,000,000

63,000,000

'

'

'

'

'

'

506,000,000

512,000,000

477,000,000

473,000,000

'

'

'

'

'

166,000,000

'

'

63,000,000

68,000,000

'

166,000,000

221,000,000

'

'

'

122,000,000

127,000,000

'

'

57,000,000

80,000,000

53,000,000

'

'

7,000,000

'

'

22,000,000

'

'

38,000,000

'

21,000,000

'

76,000,000

78,000,000

'

'

'

'

0

'

'

0

'

'

66,000,000

69,000,000

'

'

42,000,000

44,000,000

36,000,000

58,000,000

'

'

23,000,000

24,000,000

'

31,000,000

32,000,000

'

1,000,000

2,000,000

'

'

'

'

'

'

'

'

0

'

'

0

'

'

0

'

'

0

'

'

0

'

3,258,000,000

1,783,000,000

'

447,000,000

'

59,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

263,000,000

207,000,000

215,000,000

139,000,000

18,000,000

25,000,000

25,000,000

16,000,000

34,000,000

20,000,000

'

5,000,000

300,000,000

191,000,000

222,000,000

28,000,000

'

'

'

'

'

'

'

'

Proceeds from Lines of Credit

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

164,000,000

'

'

62,000,000

'

'

'

'

'

11,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

29,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

62,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

'

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'

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'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit, Issued Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

27,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Power Generation Capacity (in MWs)

2,984

[1]

2,984

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

'

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'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Period Payment is Due After Receipt of Cash Grant

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'10 days

'

'

'

'

'10 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total long-term debt

3,926,000,000

3,926,000,000

'

1,569,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable rate basis

'3 month LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'LIBOR

'

'

'

'

'

'LIBOR

'

'

'3 month LIBOR

'3 month LIBOR

'

'LIBOR

'LIBOR

'

'

'

'

'

'LIBOR

'

'LIBOR

'

'

'

'

'

'

'

'LIBOR

'

'

'3 month LIBOR

'3 month LIBOR

'

'

'

'

'

'

'

'

'

'

'3 month LIBOR

'

'

'1 month LIBOR

'6 month LIBOR

'

'

'

'1 month LIBOR

'LIBOR

'

'

'LIBOR

'

'

'

'

'LIBOR

'

'

'LIBOR

'

'

'

'LIBOR

'

'

'

'

'

'LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 month LIBOR

'3 month LIBOR

'3 month LIBOR

'3 month LIBOR

'3 month LIBOR

'3 month LIBOR

'LIBOR

'

'6 month LIBOR

'6 month LIBOR

'6 month LIBOR

'LIBOR

'

'

'3- Month LIBOR

'

'3-Month LIBOR

'

'3-Month LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3-Month LIBOR

'3-Month LIBOR

'3-Month LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

'

'

2.50%

'

1.75%

'

'

2.25%

1.75%

'

'

'

'

'

'

'

'

'

1.75%

'

1.88%

'

'

'

'

'

'

'

'

'

2.00%

1.75%

'

'

'

'

'

'

'

'

'

'

2.50%

1.50%

'

2.50%

'

2.00%

'

'

2.00%

'

'

'

'

2.50%

5.65%

'

'

'

2.38%

'

'

2.75%

'

'

'

2.01%

'

'

'

'

'

2.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.75%

1.75%

2.00%

3.00%

1.88%

2.13%

'

2.63%

'

2.00%

2.25%

'

2.00%

'

'

2.00%

'

2.38%

'

2.00%

'

'

'

'

'

2.25%

1.75%

'

'

2.88%

2.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Extinguishment of Debt, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.95%

7.25%

'

'

5.15%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.00%

'

'

5.95%

'

'

'

'

'

3.50%

3.50%

5.38%

'

7.01%

'

3.25%

5.70%

'

2.75%

6.07%

'

2.75%

5.94%

'

2.75%

6.07%

'

2.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.38%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Issuance Cost

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Current Maturities

157,000,000

157,000,000

'

214,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.15%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

540,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60,000,000

450,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

480,000,000

'

60,000,000

90,000,000

48,000,000

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit, Drawn Amount

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Incremental Escalation On Basis Spread, Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.13%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.25%

0.13%

'

'

0.03%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Contributions from Parent

'

'

'

'

2,000,000

150,000,000

[2]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

13,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

34,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional Amount of Interest Rate Derivatives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

944,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

20,000,000

'

'

'

'

'

103,000,000

65,000,000

216,000,000

138,000,000

84,000,000

53,000,000

162,000,000

103,000,000

Debt Instrument, Convertible, Conversion Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$46.55

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Convertible, Conversion Ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21.4822

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Convertible, Carrying Amount of Equity Component

20,000,000

20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt

23,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance of Senior Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity Available for Issuance of Letters of Credit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit Outstanding, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

33,000,000

'

1,000,000

48,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for (Proceeds from) Other Investing Activities

'

($11,000,000)

$0

[2]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$21,000,000

$30,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Fixed Interest Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.47%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of SeptemberB 30, 2014.

[2]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	2 Months Ended	3 Months Ended						9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'	'	'		'	'
Dividends Payable, Date to be Paid	'	15-Dec-14	15-Sep-14	16-Jun-14	17-Mar-14	'		'	'
Net Income Attributable to NRG Yield, Inc.	$9	'	$6	'	'	$9	[1]	$16	$9	[1]
Basic and Diluted Earnings per Class A Common Share	$0.39	'	$0.20	'	'	$0.39		$0.62	$0.39
Weighted average number of Class A common shares outstanding	23	'	31	'	'	0		25	0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	'	'	7	'	'	'		6	'
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Changes_in_Capital_Structure_C

Changes in Capital Structure Changes in Capital Structure (Details) (USD $)	3 Months Ended						0 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Jul. 29, 2014	Jul. 22, 2013	Sep. 30, 2014	Sep. 30, 2013
					Common Class A	Common Class A	Public Shareholders	Public Shareholders	Public Shareholders	Public Shareholders
							Common Class A	Common Class A	Common Class A	Common Class A
Class of Stock [Line Items]	'	'	'	'	'	'	'	'	'	'
Common Stock, Shares, Outstanding	'	'	'	'	34,586,250	22,511,250	'	'	'	'
Dividends	'	$0.38	'	'	'	'	'	'	'	'
Sale of Stock, Number of Shares Issued in Transaction	'	'	'	'	'	'	12,075,000	22,511,250	'	'
Proceeds from Issuance of Common Stock	'	'	'	'	'	'	$630	'	$630	$468
Dividends Payable, Date to be Paid	15-Dec-14	15-Sep-14	16-Jun-14	17-Mar-14	'	'	'	'	'	'

Segment_Reporting_Details

Segment Reporting (Details) (USD $)	2 Months Ended	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2014	Sep. 30, 2013		Dec. 31, 2013
Segment Reporting	'	'	'		'	'		'
Operating revenues	'	$161	$126	[1]	$435	$261	[1]	'
Cost of operations	'	52	44		157	105		'
Depreciation and amortization	'	34	18	[1]	94	38	[1]	'
General and administrative b affiliate	1	3	1	[1]	7	5	[1]	'
Operating Income	'	70	63		175	113	[1]	'
Equity in earnings of unconsolidated affiliates	'	11	12	[1]	26	18	[1]	'
Interest Expense	'	-41	-21	[1]	-97	-32	[1]	'
Other Income	'	1	'		2	1		'
Income (loss) before income taxes	'	41	54		106	100	[1]	'
Income Tax Expense (Benefit)	'	10	5	[1]	15	5	[1]	'
Net Income (Loss)	'	31	49	[1]	91	95	[1]	'
Total assets	'	5,899	'		5,899	'		3,238	[1]
Conventional Generation	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
Operating revenues	'	65	57		182	77		'
Cost of operations	'	9	13		31	16		'
Depreciation and amortization	'	15	7		51	9		'
Operating Income	'	41	37		100	52		'
Equity in earnings of unconsolidated affiliates	'	4	5		11	12		'
Interest Expense	'	-11	-10		-33	-13		'
Other Income	'	0	'		0	1		'
Income (loss) before income taxes	'	34	32		78	52		'
Net Income (Loss)	'	34	32		78	52		'
Total assets	'	1,526	'		1,526	'		'
Renewables	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
Operating revenues	'	48	29		97	71		'
Cost of operations	'	11	3		18	8		'
Depreciation and amortization	'	14	7		29	18		'
Operating Income	'	23	19		50	45		'
Equity in earnings of unconsolidated affiliates	'	7	7		15	6		'
Interest Expense	'	-19	-9		-41	-13		'
Other Income	'	0	'		1	0		'
Income (loss) before income taxes	'	11	17		25	38		'
Net Income (Loss)	'	11	17		25	38		'
Total assets	'	3,413	'		3,413	'		'
Thermal	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
Operating revenues	'	48	40		156	113		'
Cost of operations	'	32	28		108	81		'
Depreciation and amortization	'	5	4		14	11		'
Operating Income	'	11	8		34	21		'
Equity in earnings of unconsolidated affiliates	'	0	0		0	0		'
Interest Expense	'	-2	-2		-6	-6		'
Other Income	'	0	'		0	0		'
Income (loss) before income taxes	'	9	6		28	15		'
Net Income (Loss)	'	9	6		28	15		'
Total assets	'	434	'		434	'		'
Corporate	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
Operating revenues	'	0	0		0	0		'
Cost of operations	'	0	0		0	0		'
Depreciation and amortization	'	0	0		0	0		'
Operating Income	'	-5	-1		-9	-5		'
Equity in earnings of unconsolidated affiliates	'	0	0		0	0		'
Interest Expense	'	-9	0		-17	0		'
Other Income	'	1	'		1	0		'
Income (loss) before income taxes	'	-13	-1		-25	-5		'
Net Income (Loss)	'	-23	-6		-40	-10		'
Total assets	'	526	'		526	'		'
Affiliate	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
General and administrative b affiliate	'	3	1		7	5		'
Business Combination, Integration Related Costs	'	2	'		2	'		'
Affiliate | Conventional Generation	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
General and administrative b affiliate	'	0	0		0	0		'
Business Combination, Integration Related Costs	'	0	'		0	'		'
Affiliate | Renewables	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
General and administrative b affiliate	'	0	0		0	0		'
Business Combination, Integration Related Costs	'	0	'		0	'		'
Affiliate | Thermal	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
General and administrative b affiliate	'	0	0		0	0		'
Business Combination, Integration Related Costs	'	0	'		0	'		'
Affiliate | Corporate	'	'	'		'	'		'
Segment Reporting	'	'	'		'	'		'
General and administrative b affiliate	'	3	1		7	5		'
Business Combination, Integration Related Costs	'	$2	'		$2	'		'
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Income_Taxes_Details

Income Taxes (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Jul. 29, 2014

Jun. 30, 2014

Jul. 29, 2014

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield LLC [Member]

NRG Yield, Inc. [Member]

NRG Yield, Inc. [Member]

NRG

NRG

NRG

NRG

Income Taxes

'

'

'

'

'

'

'

'

'

'

'

Income before income taxes

$41

$54

$106

$100

[1]

'

'

'

'

'

'

'

Income tax expense

10

5

[1]

15

5

[1]

'

'

'

'

'

'

'

Effective tax rate (as a percent)

24.40%

9.30%

14.20%

5.00%

'

'

'

'

'

'

'

Statutory income tax rate (as a percent)

35.00%

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

44.70%

34.50%

55.30%

65.50%

55.30%

65.50%

Adjustment to additional paid-in capital for tax basis differences

'

'

$71

'

$153

'

'

'

'

'

'

[1]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)

2 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2014

Management Services Agreement with NRG

NRG Solar Alpine LLC [Member]

NRG Yield [Member]

NRG Repowering Holdings LLC [Member]

NRG Repowering Holdings LLC [Member]

Scenario, Plan [Member]

Management Services Agreement with NRG

Related Party Transaction

'

'

'

'

'

'

'

'

'

'

'

Service Management Costs

'

'

'

'

'

'

'

'

'

'

$1.50

Capital contributions percentage

'

'

100.00%

'

'

'

'

48.95%

'

'

'

Management Services Fee, Annual

'

'

'

'

'

2

'

'

'

'

'

General and administrative b affiliate

1

3

1

[1]

7

5

[1]

'

'

'

'

'

'

Due to Affiliate

'

'

'

'

'

'

14

'

'

'

'

Payments

'

'

'

'

'

'

'

'

'

18

'

Receipt of payments

'

'

'

'

'

'

'

'

$11

'

'

[1]

Retrospectively adjusted as discussed in Note 1, Nature of Business.

Environmental_Matters_Details

Environmental Matters (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Environmental Remediation Obligations [Abstract]	'
Litigation Settlement, Amount	$123,000