Clearway Energy (CWEN) 10-Q 12 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013	Oct. 31, 2013
		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-13	'	'
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	'2013	'	'
Document Fiscal Period Focus	'Q3	'	'
Class of Stock	'	'	'
Entity Common Stock, Shares Outstanding	'	22,511,250	42,738,750

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	2 Months Ended	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Revenues	'	'	'	'	'
Total operating revenues	'	$95	$47	$227	$133
Operating Costs and Expenses	'	'	'	'	'
Cost of operations	'	33	28	92	81
Depreciation and amortization	'	16	6	35	18
Total operating costs and expenses	'	50	36	132	105
Operating Income	'	45	11	95	28
Other Income/(Expense)	'	'	'	'	'
Equity in earnings of unconsolidated affiliates	'	12	6	18	15
Other income, net	'	1	0	1	0
Interest expense	'	-13	-5	-24	-25
Total other income/(expense)	'	0	1	-5	-10
Income Before Income Taxes	'	45	12	90	18
Income tax expense	'	5	8	5	10
Net Income	'	40	4	85	8
Less: Net income attributable to noncontrolling interest	22	'	'	'	'
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	'	37	1	101	-2
Net income attributable to NRG Yield, Inc.	$9	$9	'	'	'
Earnings Per Share Attributable to NRG Yield, Inc. Class A Common Stockholders	'	'	'	'	'
Weighted average number of Class A common shares outstanding	23	'	'	'	'
Earnings per weighted average Class A common share b basic and diluted	$0.39	$0.39	'	'	'

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	2 Months Ended	3 Months Ended		9 Months Ended		1 Months Ended	7 Months Ended	2 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jul. 22, 2013	Jul. 22, 2013	Sep. 30, 2013
						Predecessor	Predecessor	Successor
Other Comprehensive (Loss)/Income, net of tax	'	'	'	'	'	'	'	'
Net income/(loss)	'	$40	$4	$85	$8	'	$54	$31
Unrealized (loss)/gain on derivatives, net of income tax expense/(benefit) of $1, ($2), $1 and ($7)	'	-3	-3	16	-10	'	'	'
Other comprehensive (loss)/income	'	-3	-3	16	-10	'	'	'
Comprehensive Income	'	37	1	101	-2	9	73	28
Comprehensive income attributable to noncontrolling interest	20	'	'	20	'	'	'	'
Comprehensive Income (Loss), Net of Tax, Available for Common Stockholders	$8	'	'	'	'	'	'	'

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unrealized gain/loss on derivatives, income tax expense /(benefit)	$1	($2)	$1	($7)

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$121	$22
Restricted cash	91	20
Inventory	9	5
Notes receivable	9	9
Renewable energy grant receivable	101	0
Deferred income taxes	4	1
Prepayments and other current assets	18	2
Total current assets	408	81
Property, plant and equipment, net of accumulated depreciation of $134 and $115	1,487	1,598
Other Assets	'	'
Equity investments in affiliates	251	220
Intangible assets, net of accumulated amortization of $6 and $3	27	30
Derivative instruments	7	0
Deferred income taxes	116	0
Other non-current assets	26	21
Total other assets	436	285
Total Assets	2,331	1,964
Current Liabilities	'	'
Current portion of long-term debt	147	58
Derivative instruments	23	19
Accrued expenses and other current liabilities	30	16
Total current liabilities	267	285
Other Liabilities	'	'
Deferred income taxes	0	4
Derivative instruments	25	61
Other non-current liabilities	28	25
Total non-current liabilities	1,073	839
Total Liabilities	1,340	1,124
Commitments and Contingencies	'	'
Stockholders' Equity	'	'
Members' equity	0	834
Additional paid-in capital	571	0
Retained earnings	9	30
Accumulated other comprehensive loss	-2	-24
Noncontrolling interest	413	0
Total Stockholders' Equity	991	840
Total Liabilities and Stockholdersb Equity	2,331	1,964
Non-affiliate	'	'
Current Assets	'	'
Accounts receivable	54	22
Other Assets	'	'
Notes receivable	7	8
Current Liabilities	'	'
Accounts payable	26	166
Other Liabilities	'	'
Long-term debt	1,020	723
Affiliate	'	'
Current Assets	'	'
Accounts receivable	1	0
Other Assets	'	'
Notes receivable	2	6
Current Liabilities	'	'
Accounts payable	41	26
Other Liabilities	'	'
Long-term debt	$0	$26

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Property, plant and equipment, accumulated depreciation	$149	$115
Intangible assets, accumulated amortization	$6	$3

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities	'	'
Net income/(loss)	$85	$8
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Distributions and equity in earnings of unconsolidated affiliates	-10	1
Depreciation and amortization	35	18
Amortization of financing costs and debt discount/premiums	1	0
Amortization of intangibles and out-of-market contracts	2	1
Changes in deferred income taxes	5	10
Changes in derivative instruments	-14	3
Changes in other working capital	-1	-21
Net Cash Provided by Operating Activities	103	20
Cash Flows from Investing Activities	'	'
Capital expenditures	-232	-273
Increase in restricted cash, net	-71	-2
Decrease/(increase) in notes receivable	5	-12
Proceeds from renewable energy grants	24	27
Investments in unconsolidated affiliates	-19	-2
Net Cash Used by Investing Activities	-293	-262
Cash Flows from Financing Activities	'	'
Proceeds from Issuance of Common Stock	468	0
Proceeds from issuance of long-term debt b external	420	49
Payment of debt issuance costs	-5	-11
Net Cash Provided by Financing Activities	289	248
Net Increase in Cash and Cash Equivalents	99	6
Cash and Cash Equivalents at Beginning of Period	22	24
Cash and Cash Equivalents at End of Period	121	30
Affiliate	'	'
Cash Flows from Financing Activities	'	'
Capital contributions from NRG	150	279
Dividends and returns of capital to NRG	-707	-32
Payments for long-term debt	-2	-5
Non-affiliate	'	'
Cash Flows from Financing Activities	'	'
Payments for long-term debt	($35)	($32)

Nature_of_Business_Notes

Nature of Business (Notes)	9 Months Ended
	Sep. 30, 2013
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.  Following the initial public offering, the Company owns 34.5% of NRG Yield LLC and consolidates the results of NRG Yield LLC through its controlling interest, with NRG's 65.5% interest shown as noncontrolling interest in the financial statements. The Company's outstanding shares after the initial public offering are described in Note 8, Stockholders' Equity.
	The following table represents the structure of the Company after the initial public offering:
	For all periods 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.
	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
				910
	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
	Roadrunner	100	%	20	El Paso Electric	2031
	CVSR(b)	48.95	%	122	Pacific Gas and Electric	2038
				303
	Distributed Solar
	AZ DG Solar Projects	100	%	5	Various	2025 - 2033
	PFMG DG Solar Projects	51	%	5	Various	2032
				10
	Wind
	South Trent	100	%	101	AEP Energy Partners	2029
	Thermal (c)	100	%	1,098	Various	Various
	Thermal generation	100	%	123	Various	Various
	(a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2013.
	(b) As of September 30, 2013, approximately 72 MW of net capacity had reached commercial operations.
	(c) For thermal energy, net capacity represents MWt for steam or chilled water. This excludes the 123 MW of thermal generation.
	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 and income tax expense. Management believes the assumptions and methodology underlying the allocation of general corporate overhead expenses are reasonable. 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 offering or of the costs expected to be incurred in the future. Allocations of NRG corporate expenses were immaterial for the period beginning on July 1, 2013 and ending on July 22, 2013, $2 million for the three months ended September 30, 2012, $4 million for the period beginning on January 1, 2013 and ending on July 22, 2013, and $6 million for the nine months ended September 30, 2012. 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.
	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 annual financial statements for the years ended December 31, 2012 and 2011 contained in the Company's Prospectus. 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, 2013, and the results of operations, comprehensive income and cash flows for the three and nine months ended September 30, 2013, and 2012.
	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.

Business_Acquisition_Notes

Business Acquisition (Notes)	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Business Acquisition	'
	Business Acquisition
	On December 14, 2012, through its acquisition of GenOn Energy, Inc., or GenOn, NRG acquired 100% of the Marsh Landing project, a 720 MW natural gas-fueled peaking facility being constructed near Antioch, California. Immediately prior to the initial public offering, NRG transferred ownership of Marsh Landing to NRG Yield LLC. Power generated from Marsh Landing is sold to Pacific Gas & Electric, or PG&E, under a 10 year PPA. In connection with the acquisition, the Company assumed obligations under a credit agreement for up to $650 million in construction and permanent financing for the Marsh Landing generating facility. The Marsh Landing generating facility reached commercial operations on May 1, 2013.
	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 any 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. During the nine months ended September 30, 2013, a measurement period adjustment was recorded increasing the provisional fair value of the acquired property, plant and equipment by $73 million, from $537 million to $610 million. Accordingly, the provisional fair value of the net assets acquired was $138 million. The primary driver for the revised fair value was the refinement of the methodology used to value the assets.

Property_Plant_and_Equipment_P

Property, Plant and Equipment Property, Plant and Equipment (Notes)	9 Months Ended
	Sep. 30, 2013
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, 2013		December 31, 2012			Depreciable Lives
		(In millions)
	Facilities and equipment	1,597		$	753		5 - 40 Years
	Land and improvements	34		30
	Construction in progress	5		930
	Total property, plant and equipment	1,636		1,713
	Accumulated depreciation	(149	)	(115		)
	Net property, plant and equipment	1,487		$	1,598
	On February 13, 2013, the Avra Valley 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 $27 million. A receivable for the cash grant application was recorded when the cash grant application was filed, which resulted in a reduction to the book basis of the property, plant, and equipment. In addition, the receivable was subsequently reduced to $24 million as a result of the federal government’s sequestration, which went into effect on March 1, 2013. The related deferred tax asset of $7 million recognizable was recorded with a corresponding reduction of the book value of Avra Valley’s property, plant and equipment. In June 2013, the Company received payment for the cash grant related to Avra Valley.
	Alpine achieved commercial operations on January 18, 2013 and transferred the construction in progress to property, plant and equipment. On March 25, 2013, the Alpine solar project, as a qualified renewable energy project, applied for a cash grant in lieu of investment tax credit from U.S. Treasury Department in the amount of $72 million. A receivable for the cash grant application was recorded when the cash grant 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 $65 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 $19 million recognizable was recorded with a corresponding reduction of the book value of Alpine’s property plant and equipment.
	Borrego 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 U.S. Treasury Department in the amount of $39 million. A receivable for the cash grant application was recorded when the cash grant 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 recognizable was recorded with a corresponding reduction of the book value of Borrego’s property plant and equipment.
	Marsh Landing achieved commercial operations on May 1, 2013 and transferred the construction in progress to property, plant and equipment. The Marsh Landing project was acquired by NRG through the acquisition of GenOn. See Note 2, Business Acquisition, for further discussion of the acquisition.

Variable_Interest_Entities_or_

Variable Interest Entities, or VIEs (Notes)	9 Months Ended
	Sep. 30, 2013
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 Holding LLC, the owner of GenConn Energy LLC, or GenConn, a limited liability company formed to construct, own and operate two 190 MW peaking generation facilities in Connecticut at NRG’s 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 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, 2013, the Company's investment in GenConn was $118 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, 2013, the refinanced facility is comprised of a $237 million note with an interest rate of 4.73% and a maturity date of July 2041 and a 5-year, $35 million working capital facility which can be used to issue letters of credit at an interest rate of 1.875%. The refinancing is secured by all of the GenConn assets.
	The following table presents summarized unaudited financial information for GCE Holdings LLC, a significant equity method investment of the Company:
		Three months ended September 30,				Nine months ended September 30,
		2013		2012		2013		2012
	Income Statement Data:	(In millions)
	Operating revenues	$	21	$	20	$	60	$	59
	Operating income	11		11		34		34
	Net income	8		8		23		23
		September 30, 2013		December 31, 2012
	Balance Sheet Data:	(In millions)
	Current assets	$	40	$	37
	Non-current assets	457		459
	Current liabilities	29		24
	Non-current liabilities	231		223

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments (Notes)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	For cash and cash equivalents, restricted cash, accounts and other receivables, accounts payable and intercompany accounts payable and receivable, 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, 2013								As of December 31, 2012
		Carrying Amount				Fair Value				Carrying Amount		Fair Value
		(In millions)
	Assets:
	Notes receivable — affiliate	$	2			$	2			$	6	$	6
	Notes receivable, including current portion	16				16				17		17
	Liabilities:
	Long-term debt, including current portion	1,167				1,170				781		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 condensed consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:
		As of September 30, 2013
		Fair Value
	(In millions)	Level 1				Level 2				Level 3		Total
	Derivative assets:
	Interest rate contracts	$	—			$	7			$	—	$	7
	Derivative liabilities:
	Commodity contracts	$	—			$	—			$	1	$	1
	Interest rate contracts	—				47				—		47
	Total liabilities	$	—			$	47			$	1	$	48
	As of December 31, 2012, assets and liabilities measured and recorded at fair value on the Company’s balance sheets were classified as Level 2 within the fair value hierarchy. There were no transfers during the three and nine months ended September 30, 2013 and 2012, between Levels 1 and 2. The following table reconciles, for the three and nine months ended September 30, 2013, 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 (Level 3)
	(In millions)		Three months ended September 30, 2013				Nine months ended September 30, 2013
			Derivatives				Derivatives
	Beginning balance		$	—			$	—
	Purchases		(1		)		(1		)
	Ending balance as of September 30, 2013		$	(1	)		$	(1	)
	There were no gains or losses for the three or nine month periods included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30, 2013.
	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. As of September 30, 2013, contracts valued with prices provided by models and other valuation techniques make up 0% of the total derivative assets and 2% of the total derivative liabilities.
	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
	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, 2013, credit risk exposure to these counterparties attributable to the Company's ownership interests was approximately $649 million for the next five years. This amount excludes potential credit exposures for projects with long term PPAs that have not reached commercial operations. 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, 2013
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, 2013, the Company had forward contracts for the purchase of fuel commodities relating to the forecasted usage of the Company’s district energy centers. At September 30, 2013, these contracts were not designated as cash flow or fair value hedges.
	Interest Rate Swaps
	As of September 30, 2013, the Company had interest rate derivative instruments on non-recourse debt extending through 2030, the majority 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 commodity as of September 30, 2013 and December 31, 2012.
				Total Volume
				September 30, 2013			December 31, 2012
	Commodity	Units		(In millions)
	Natural Gas	MMBtu		2			2
	Interest	Dollars		$	818		$	804
	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, 2013				December 31, 2012			September 30, 2013			December 31, 2012
		(In millions)
	Derivatives Designated as Cash Flow Hedges:
	Interest rate contracts current	$	—			$	—		$	19		$	14
	Interest rate contracts long-term	4				—			24			54
	Total Derivatives Designated as Cash Flow Hedges	4				—			43			68
	Derivatives Not Designated as Cash Flow Hedges:
	Interest rate contracts current	—				—			3			3
	Interest rate contracts long-term	3				—			1			7
	Commodity contracts current	—				—			1			2
	Total Derivatives Not Designated as Cash Flow Hedges	3				—			5			12
	Total Derivatives	$	7			$	—		$	48		$	80
	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, 2013, there is 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, 2013	(In millions)
	Commodity contracts:
	Derivative liabilities	$	(1	)		$	—		$	(1	)
	Total commodity contracts	(1		)		—			(1		)
	Interest rate contracts:
	Derivative assets	7				(4		)	3
	Derivative liabilities	(47		)		4			(43		)
	Total interest rate contracts	(40		)		—			(40		)
	Total derivative instruments	$	(41	)		$	—		$	(41	)
	As of December 31, 2012, the Company's derivative positions were all in liability positions and there was no outstanding collateral paid or received. Thus, there would be no change to the balance sheet if presenting derivative assets and liabilities on a net basis.
	Accumulated Other Comprehensive Income (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,
		2013				2012			2013			2012
		(In millions)
	Accumulated OCL beginning balance	$	(5	)		$	(22	)	$	(24	)	$	(15	)
	Reclassified from accumulated OCL to income due to realization of previously deferred amounts	—				—			3			1
	Mark-to-market of cash flow hedge accounting contracts	(3		)		(3		)	13			(11		)
	Accumulated OCL ending balance, net of income tax benefit of $1 and $17, respectively	(8		)		$	(25	)	(8		)	$	(25	)
	Accumulated OCL attributable to noncontrolling interest	(6		)					(6		)
	Accumulated OCL attributable to Class A common shareholders	$	(2	)					$	(2	)
	A loss of $5 million is expected to be realized from OCL during the next 12 months, net of $1 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. For the three months ended September 30, 2013 and 2012, the impact to the statement of operations was a gain of $1 million and a loss of $1 million, respectively. For the nine months ended September 30, 2013 and 2012, the impact to the statement of operations was a gain of $10 million and a loss of $12 million, respectively.
	The Company’s derivative commodity contracts relate to its Thermal business for the purchase of fuel commodities related to 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 5, Fair Value of Financial Instruments, for discussion regarding concentration of credit risk.

Longterm_Debt

Long-term Debt	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Long-term Debt	'
	Long-term Debt
	Long-term debt consisted of the following:
		September 30, 2013		December 31, 2012		Current interest rate % (a)
		(In millions, except rates)
	Debt — external:
	NRG Marsh Landing LLC, due 2017 and 2023	$	500	$	390	L+ 2.50 - 2.75
	NRG Solar Alpine LLC, due 2013 and 2022	223		2		L+ 2.25 - 2.50
	NRG Energy Center Minneapolis LLC, senior secured notes, due 2013, 2017 and 2025	129		137		5.95 - 7.31
	NRG Solar Borrego I LLC, due 2024 and 2038	79		—		L+ 2.50/5.65
	South Trent Wind LLC, due 2020	69		72		L+ 2.625
	NRG Solar Avra Valley LLC, due 2031	64		66		L+ 2.25
	NRG Roadrunner LLC, due 2031	44		46		L+ 2.01
	NRG Solar Blythe LLC, due 2028	25		25		L+ 2.50
	PFMG and related subsidiaries, due 2030	32		41		6
	NRG Energy Center Princeton LLC, due 2017	2		2		0
	Subtotal debt — external	1,167		781
	Debt — affiliate:
	Note payable to NRG Energy, Inc. — South Trent	—		26		L+ 2.00
	Subtotal debt — affiliate	—		26
	Total debt	1,167		807
	Less current maturities	147		58
	Total long-term debt	$	1,020	$	749
	(a) As of September 30, 2013, L+ equals 3 month LIBOR plus x%, with the exception of NRG Solar Alpine LLC cash grant loan which is 1 month LIBOR plus x%.
	The financing arrangements listed above contain certain covenants, including financial covenants, that the Company is required to be in compliance with during the term of the arrangement. As of September 30, 2013, the Company was in compliance with all of the required covenants.
	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. As of September 30, 2013, $161 million was outstanding under the term loan, $62 million under the cash grant loan, and $37 million of letters of credit were issued under the credit agreement.
	Subsequent to the conversion, Alpine returned approximately $242 million of capital to NRG. In 2013, prior to the conversion, NRG had contributed approximately $112 million into Alpine.
	Borrego Financing
	On March 28, 2013, NRG Solar Borrego I LLC, or Borrego, entered into a credit agreement with a group of lenders, or the Borrego Financing Agreement, for $45 million of 5.65% fixed rate notes and a $36 million term loan. The term loan has an interest rate of 3 month LIBOR plus an applicable margin of 2.50%, which escalates 0.25% on the fourth and eighth anniversary of the closing date. The fixed rate notes mature in February 2038 and the term loan matures in December 2024. Both amortize based upon predetermined schedules. The Borrego Financing Agreement also includes a letter of credit facility on behalf of Borrego of up to $5 million. Borrego pays an availability fee of 100% of the applicable margin on issued letters of credit. As of September 30, 2013, $45 million was outstanding under the fixed rate notes, $34 million was outstanding under the term loans, and $5 million of letters of credit in support of the project were issued.
	Under the terms of the Borrego Financing Agreement, on March 28, 2013, Borrego was required to enter into two fixed for floating interest rate swaps that would fix the interest rate for a minimum of 75% of the outstanding notional amount. Borrego will pay its counterparty the equivalent of a 1.125% fixed interest payment on a predetermined notional value, and quarterly, Borrego will receive the equivalent of a floating interest payment based on a 3 month LIBOR calculated on the same notional value through June 30, 2020. All interest rate swap payments by Borrego and its counterparties are made quarterly and the LIBOR rate is determined in advance of each interest period. The original notional amount of the swaps, which became effective April 3, 2013, is $15 million and will amortize in proportion to the term loan.
	Subsequent to the borrowing, Borrego returned approximately $76 million of capital to NRG. In 2013, prior to the return of capital, NRG had contributed approximately $19 million into Borrego.
	NRG Yield 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 provides a revolving line of credit of $60 million. The NRG Yield revolving credit facility can be used for cash or for the issuance of letters of credit.
	Marsh Landing Credit Agreement Term Conversion
	In May 2013, Marsh Landing met the conditions under the credit agreement to convert the construction loan for the facility to a term loan which will amortize on a predetermined basis. Prior to term conversion, Marsh Landing drew the remaining funds available under the facility in order to pay costs due for construction. Marsh Landing issued a $26 million letter of credit under the facility in support of its debt service requirements.
	Note Payable to NRG — South Trent
	On June 14, 2010, NRG South Trent Holdings LLC entered into a $34 million promissory note with a wholly owned subsidiary of NRG, with a maturity date of 2020. On July 17, 2013, NRG converted the remaining receivable under the promissory note of approximately $25 million into equity in NRG South Trent Holdings LLC and terminated the note.

Stockholders_Equity_Stockholde

Stockholders' Equity Stockholders' Equity (Notes)	9 Months Ended
	Sep. 30, 2013
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity	'
	Note 8 — Stockholders' Equity
	Shares Issued and Outstanding
	On July 22, 2013, in connection with its initial public offering, the Company authorized 500,000,000 shares of Class A common stock, par value $0.01 per share, of which 22,511,250 were issued to the public in connection with the initial public offering and became outstanding. In return for the issuance of these shares, the Company received $468 million, net of underwriting discounts and commissions of $27 million. In addition, in connection with the initial public offering, the Company authorized 500,000,000 shares of Class B common stock, par value $0.01 per share, of which 42,738,750 were issued to NRG concurrently with the initial public offering and became outstanding. The Company utilized $395 million of the proceeds from the issuance of the Class A common stock to acquire a controlling interest in NRG Yield LLC from NRG. Each share of both of the Class A common stock and Class B common stock entitles the holder to one vote on all matters. Class A common stockholders hold 100% of the economic interest and a 34.5% voting interest in the Company. Class B common stockholders hold a 65.5% voting interest in the Company.
	The following table reflects the Company's common shares issued and outstanding as of September 30, 2013:
	Shares:		Issued and Outstanding	Holders
	Class A common stock		22,511,250	Public shareholders
	Class B common stock		42,738,750	NRG
	On October 31, 2013, the Company declared a pro-rated initial dividend of $0.23 per Class A common share, payable on December 16, 2013, to shareholders of record as of December 2, 2013. Subsequent quarterly dividends will be set at $0.30 per Class A common share, or $1.20 per share on an annualized basis. The Class A common stock dividend is subject to available capital, market conditions, and compliance with associated laws and regulations.
	The Company also authorized 10,000,000 shares of preferred stock, par value $0.01 per share. None of the shares of preferred stock have been issued.
	Noncontrolling Interest
	The following table reflects the changes in the Company's noncontrolling interest balance:
		(In millions)
	Balance as of December 31, 2012	$	—
	Contributions from noncontrolling interest, net of returns of capital	393
	Comprehensive income attributable to noncontrolling interest	20
	Balance as of September 30, 2013	$	413

Earnings_Per_Share_Notes

Earnings Per Share (Notes)	9 Months Ended
	Sep. 30, 2013
Earnings (Loss) Per Share Disclosure [Abstract]	'
Earnings Per Share	'
	Note 9 — Earnings Per Share
	Basic and diluted earnings per common share is computed by dividing net income by the weighted average number of 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:
		Period from July 23, 2013 to September 30, 2013
	(In millions, except per share data)
	Basic and diluted earnings per share attributable to NRG Yield, Inc. Class A common stockholders
	Net income attributable to NRG Yield, Inc.	$	9
	Weighted average number of Class A common shares outstanding	23
	Earnings per weighted average Class A common share — basic and diluted	$	0.39
	There were no anti-dilutive outstanding equity instruments as of September 30, 2013.

Segment_Reporting_Notes

Segment Reporting (Notes)	9 Months Ended
	Sep. 30, 2013
Segment Reporting Disclosure [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, 2013
	(In millions)	Conventional Generation		Renewables			Thermal		Corporate			Total
	Operating revenues	$	32	$	23		$	40	$	—		$	95
	Cost of operations	3		2			28		—			33
	Depreciation and amortization	6		6			4		—			16
	General and administrative — affiliate	—		—			—		1			1
	Equity in earnings of unconsolidated affiliates	5		7			—		—			12
	Income/(loss) before income taxes	24		16			6		(1		)	45
	Net income/(loss)	24		16			6		(6		)	40
	Total assets	$	892	$	882		$	331	$	226		$	2,331
		Three months ended September 30, 2012
	(In millions)	Conventional Generation		Renewables			Thermal		Corporate			Total
	Operating revenues	$	—	$	7		$	40	$	—		$	47
	Cost of operations	—		1			27		—			28
	Depreciation and amortization	—		3			3		—			6
	General and administrative — affiliate	—		—			—		2			2
	Equity in earnings of unconsolidated affiliates	3		3			—		—			6
	Income/(loss) before income taxes	3		3			8		(2		)	12
	Net income/(loss)	3		3			8		(10		)	4
		Nine months ended September 30, 2013
	(In millions)	Conventional Generation		Renewables			Thermal		Corporate			Total
	Operating revenues	$	51	$	63		$	113	$	—		$	227
	Cost of operations	4		7			81		—			92
	Depreciation and amortization	8		16			11		—			35
	General and administrative — affiliate	—		—			—		5			5
	Equity in earnings of unconsolidated affiliates	12		6			—		—			18
	Income/(loss) before income taxes	43		37			15		(5		)	90
	Net income/(loss)	43		37			15		(10		)	85
		Nine months ended September 30, 2012
	(In millions)	Conventional Generation		Renewables			Thermal		Corporate			Total
	Operating revenues	$	—	$	24		$	109	$	—		$	133
	Cost of operations	—		4			77		—			81
	Depreciation and amortization	—		7			11		—			18
	General and administrative — affiliate	—		—			—		6			6
	Equity in earnings of unconsolidated affiliates	11		4			—		—			15
	Income/(loss) before income taxes	11		(2		)	15		(6		)	18
	Net income/(loss)	11		(2		)	15		(16		)	8

Income_Taxes_Notes

Income Taxes (Notes)	9 Months Ended
	Sep. 30, 2013
Income Taxes Disclosure [Abstract]	'
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)	2013			2012			2013			2012
	Income before income taxes	$	45		$	12		$	90		$	18
	Income tax expense	5			8			5			10
	Effective tax rate	11.1		%	66.7		%	5.6		%	55.6		%
	For the three and nine months ended September 30, 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 65.5% interest in NRG Yield LLC.
	For the three and nine months ended September 30, 2012, the overall effective tax rate was different than the statutory rate of 35% primarily due to the impact of state and local income taxes.
	On July 22, 2013, the Company acquired a controlling interest in NRG Yield LLC and its subsidiary NRG Yield Operating LLC. As a result, the Company owns 34.5% of NRG Yield LLC and consolidates the results due to its controlling interest. The Company records NRG's 65.5% ownership as a noncontrolling interest in the financial statements. NRG Yield LLC is treated as a partnership for income tax purposes. As such, the Company records income tax on its 34.5% of the NRG Yield LLC taxable income. NRG records income tax on its 65.5% share of taxable income generated by NRG Yield LLC.
	The Company's deferred tax balances reflect the change in tax basis of the Company's assets as a result of the initial public offering, primarily due to an increase in the tax basis of the Company's property, plant and equipment. The change in tax basis resulted in a non-cash addition of $103 million to the Company's additional paid-in capital.

Related_Party_Transactions_Rel

Related Party Transactions Related Party Transactions (Notes)	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions Disclosure	'
	Note 12— 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. The base management fee will equal approximately $1 million per quarter subject to an inflation based adjustment annually beginning on January 1, 2014 at an inflation factor based on the year-over-year U.S. consumer price index. The fee will also be 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. Costs incurred under this agreement were approximately $1 million for the period beginning July 23, 2013 and ending September 30, 2013.
	Accounts Payable to NRG Solar LLC
	During the third quarter of 2013, NRG Solar LLC, a wholly-owned subsidiary of NRG, made capital contributions to CVSR on behalf of the Company. As of September 30, 2013, the Company had accounts payable of $11 million related to the reimbursement of these capital contributions.

Summary_of_Significant_Account

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Significant Accounting Policies [Abstract]	'
Use of Estimates (Policy)	'
	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.
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, 2013
Nature of Business Disclosure [Abstract]	'
IPO of NRG Yield	'
	The following table represents the structure of the Company after the initial public offering:
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
				910
	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
	Roadrunner	100	%	20	El Paso Electric	2031
	CVSR(b)	48.95	%	122	Pacific Gas and Electric	2038
				303
	Distributed Solar
	AZ DG Solar Projects	100	%	5	Various	2025 - 2033
	PFMG DG Solar Projects	51	%	5	Various	2032
				10
	Wind
	South Trent	100	%	101	AEP Energy Partners	2029
	Thermal (c)	100	%	1,098	Various	Various
	Thermal generation	100	%	123	Various	Various
	(a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2013.
	(b) As of September 30, 2013, approximately 72 MW of net capacity had reached commercial operations.
	(c) For thermal energy, net capacity represents MWt for steam or chilled water. This excludes the 123 MW of thermal generation.

Property_Plant_and_Equipment_P1

Property, Plant and Equipment Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'
Schedule of Property, Plant and Equipment	'
		September 30, 2013		December 31, 2012			Depreciable Lives
		(In millions)
	Facilities and equipment	1,597		$	753		5 - 40 Years
	Land and improvements	34		30
	Construction in progress	5		930
	Total property, plant and equipment	1,636		1,713
	Accumulated depreciation	(149	)	(115		)
	Net property, plant and equipment	1,487		$	1,598

Variable_Interest_Entities_or_1

Variable Interest Entities, or VIEs Variable Interest Entities, or VIEs (Tables)	9 Months Ended
	Sep. 30, 2013
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, a significant equity method investment of the Company:
		Three months ended September 30,				Nine months ended September 30,
		2013		2012		2013		2012
	Income Statement Data:	(In millions)
	Operating revenues	$	21	$	20	$	60	$	59
	Operating income	11		11		34		34
	Net income	8		8		23		23
		September 30, 2013		December 31, 2012
	Balance Sheet Data:	(In millions)
	Current assets	$	40	$	37
	Non-current assets	457		459
	Current liabilities	29		24
	Non-current liabilities	231		223

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
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, 2013								As of December 31, 2012
		Carrying Amount				Fair Value				Carrying Amount		Fair Value
		(In millions)
	Assets:
	Notes receivable — affiliate	$	2			$	2			$	6	$	6
	Notes receivable, including current portion	16				16				17		17
	Liabilities:
	Long-term debt, including current portion	1,167				1,170				781		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 condensed consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:
		As of September 30, 2013
		Fair Value
	(In millions)	Level 1				Level 2				Level 3		Total
	Derivative assets:
	Interest rate contracts	$	—			$	7			$	—	$	7
	Derivative liabilities:
	Commodity contracts	$	—			$	—			$	1	$	1
	Interest rate contracts	—				47				—		47
	Total liabilities	$	—			$	47			$	1	$	48
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, 2013, 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 (Level 3)
	(In millions)		Three months ended September 30, 2013				Nine months ended September 30, 2013
			Derivatives				Derivatives
	Beginning balance		$	—			$	—
	Purchases		(1		)		(1		)
	Ending balance as of September 30, 2013		$	(1	)		$	(1	)

Accounting_for_Derivative_Inst1

Accounting for Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2013
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 commodity as of September 30, 2013 and December 31, 2012.
				Total Volume
				September 30, 2013			December 31, 2012
	Commodity	Units		(In millions)
	Natural Gas	MMBtu		2			2
	Interest	Dollars		$	818		$	804
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, 2013				December 31, 2012			September 30, 2013			December 31, 2012
		(In millions)
	Derivatives Designated as Cash Flow Hedges:
	Interest rate contracts current	$	—			$	—		$	19		$	14
	Interest rate contracts long-term	4				—			24			54
	Total Derivatives Designated as Cash Flow Hedges	4				—			43			68
	Derivatives Not Designated as Cash Flow Hedges:
	Interest rate contracts current	—				—			3			3
	Interest rate contracts long-term	3				—			1			7
	Commodity contracts current	—				—			1			2
	Total Derivatives Not Designated as Cash Flow Hedges	3				—			5			12
	Total Derivatives	$	7			$	—		$	48		$	80
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, 2013	(In millions)
	Commodity contracts:
	Derivative liabilities	$	(1	)		$	—		$	(1	)
	Total commodity contracts	(1		)		—			(1		)
	Interest rate contracts:
	Derivative assets	7				(4		)	3
	Derivative liabilities	(47		)		4			(43		)
	Total interest rate contracts	(40		)		—			(40		)
	Total derivative instruments	$	(41	)		$	—		$	(41	)
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,
		2013				2012			2013			2012
		(In millions)
	Accumulated OCL beginning balance	$	(5	)		$	(22	)	$	(24	)	$	(15	)
	Reclassified from accumulated OCL to income due to realization of previously deferred amounts	—				—			3			1
	Mark-to-market of cash flow hedge accounting contracts	(3		)		(3		)	13			(11		)
	Accumulated OCL ending balance, net of income tax benefit of $1 and $17, respectively	(8		)		$	(25	)	(8		)	$	(25	)
	Accumulated OCL attributable to noncontrolling interest	(6		)					(6		)
	Accumulated OCL attributable to Class A common shareholders	$	(2	)					$	(2	)

Longterm_Debt_Longterm_Debt_Ta

Long-term Debt Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Schedule of Long-term Debt	'
	Long-term debt consisted of the following:
		September 30, 2013		December 31, 2012		Current interest rate % (a)
		(In millions, except rates)
	Debt — external:
	NRG Marsh Landing LLC, due 2017 and 2023	$	500	$	390	L+ 2.50 - 2.75
	NRG Solar Alpine LLC, due 2013 and 2022	223		2		L+ 2.25 - 2.50
	NRG Energy Center Minneapolis LLC, senior secured notes, due 2013, 2017 and 2025	129		137		5.95 - 7.31
	NRG Solar Borrego I LLC, due 2024 and 2038	79		—		L+ 2.50/5.65
	South Trent Wind LLC, due 2020	69		72		L+ 2.625
	NRG Solar Avra Valley LLC, due 2031	64		66		L+ 2.25
	NRG Roadrunner LLC, due 2031	44		46		L+ 2.01
	NRG Solar Blythe LLC, due 2028	25		25		L+ 2.50
	PFMG and related subsidiaries, due 2030	32		41		6
	NRG Energy Center Princeton LLC, due 2017	2		2		0
	Subtotal debt — external	1,167		781
	Debt — affiliate:
	Note payable to NRG Energy, Inc. — South Trent	—		26		L+ 2.00
	Subtotal debt — affiliate	—		26
	Total debt	1,167		807
	Less current maturities	147		58
	Total long-term debt	$	1,020	$	749
	(a) As of September 30, 2013, L+ equals 3 month LIBOR plus x%, with the exception of NRG Solar Alpine LLC cash grant loan which is 1 month LIBOR plus x%.

Stockholders_Equity_Stockholde1

Stockholders' Equity Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Stockholders' Equity Note [Abstract]	'
Schedule of Stock by Class	'
	The following table reflects the Company's common shares issued and outstanding as of September 30, 2013:
	Shares:		Issued and Outstanding	Holders
	Class A common stock		22,511,250	Public shareholders
	Class B common stock		42,738,750	NRG
Schedule of Change in Noncontrolling Interest	'
	The following table reflects the changes in the Company's noncontrolling interest balance:
		(In millions)
	Balance as of December 31, 2012	$	—
	Contributions from noncontrolling interest, net of returns of capital	393
	Comprehensive income attributable to noncontrolling interest	20
	Balance as of September 30, 2013	$	413

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings (Loss) Per Share Disclosure [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:
		Period from July 23, 2013 to September 30, 2013
	(In millions, except per share data)
	Basic and diluted earnings per share attributable to NRG Yield, Inc. Class A common stockholders
	Net income attributable to NRG Yield, Inc.	$	9
	Weighted average number of Class A common shares outstanding	23
	Earnings per weighted average Class A common share — basic and diluted	$	0.39

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting Disclosure [Abstract]	'
Schedule of Segment Reporting Information, by Segment	'
		Three months ended September 30, 2013
	(In millions)	Conventional Generation		Renewables			Thermal		Corporate			Total
	Operating revenues	$	32	$	23		$	40	$	—		$	95
	Cost of operations	3		2			28		—			33
	Depreciation and amortization	6		6			4		—			16
	General and administrative — affiliate	—		—			—		1			1
	Equity in earnings of unconsolidated affiliates	5		7			—		—			12
	Income/(loss) before income taxes	24		16			6		(1		)	45
	Net income/(loss)	24		16			6		(6		)	40
	Total assets	$	892	$	882		$	331	$	226		$	2,331
		Three months ended September 30, 2012
	(In millions)	Conventional Generation		Renewables			Thermal		Corporate			Total
	Operating revenues	$	—	$	7		$	40	$	—		$	47
	Cost of operations	—		1			27		—			28
	Depreciation and amortization	—		3			3		—			6
	General and administrative — affiliate	—		—			—		2			2
	Equity in earnings of unconsolidated affiliates	3		3			—		—			6
	Income/(loss) before income taxes	3		3			8		(2		)	12
	Net income/(loss)	3		3			8		(10		)	4
		Nine months ended September 30, 2013
	(In millions)	Conventional Generation		Renewables			Thermal		Corporate			Total
	Operating revenues	$	51	$	63		$	113	$	—		$	227
	Cost of operations	4		7			81		—			92
	Depreciation and amortization	8		16			11		—			35
	General and administrative — affiliate	—		—			—		5			5
	Equity in earnings of unconsolidated affiliates	12		6			—		—			18
	Income/(loss) before income taxes	43		37			15		(5		)	90
	Net income/(loss)	43		37			15		(10		)	85
		Nine months ended September 30, 2012
	(In millions)	Conventional Generation		Renewables			Thermal		Corporate			Total
	Operating revenues	$	—	$	24		$	109	$	—		$	133
	Cost of operations	—		4			77		—			81
	Depreciation and amortization	—		7			11		—			18
	General and administrative — affiliate	—		—			—		6			6
	Equity in earnings of unconsolidated affiliates	11		4			—		—			15
	Income/(loss) before income taxes	11		(2		)	15		(6		)	18
	Net income/(loss)	11		(2		)	15		(16		)	8

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2013
Income Taxes 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)	2013			2012			2013			2012
	Income before income taxes	$	45		$	12		$	90		$	18
	Income tax expense	5			8			5			10
	Effective tax rate	11.1		%	66.7		%	5.6		%	55.6		%

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

0 Months Ended

1 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

0 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2013

Jul. 22, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Jul. 22, 2013

Jul. 31, 2013

Jul. 22, 2013

Jul. 22, 2013

Sep. 30, 2013

Jul. 31, 2013

Jul. 22, 2013

Jul. 22, 2013

Sep. 30, 2013

Jul. 22, 2013

Jul. 22, 2013

Jul. 22, 2013

Jul. 22, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Conventional

Utility-Scale Solar

Distributed Solar

Thermal

Common Class A

NRG

NRG

NRG

NRG

NRG Yield LLC

Public Shareholders

Public Shareholders

Public Shareholders

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

GenConn Middletown

GenConn Devon

Marsh Landing

Marsh Landing

Alpine

Avenal

Avra Valley

Blythe

Borrego

Roadrunner

CVSR

AZ DG Solar Projects

PFMG DG Solar Projects

South Trent

MW

MW

MW

MW

Common Class B

Common Class B

Common Class A

Common Class A

NRG Yield, Inc.

NRG

NRG

Class A units of NRG Yield LLC

Conventional

Conventional

MW

Conventional

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

Class A units of NRG Yield LLC

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

Nature of Business

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Shares, Outstanding

'

'

'

'

'

'

'

'

'

'

'

'

42,738,750

'

'

'

22,511,250

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Number of Shares Issued in Transaction

'

'

'

'

'

'

'

'

'

'

'

42,738,750

'

'

'

22,511,250

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Number of Shares Acquired in Transaction

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19,011,250

3,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Interest in Subsidiaries and Affiliates

'

'

'

'

'

'

'

'

'

$395

'

'

'

$73

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

34.50%

65.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Voting Interest

'

'

'

'

'

'

'

'

'

'

65.50%

'

'

'

34.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance Initial Public Offering

'

'

'

'

'

'

'

'

468

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of Ownership

'

'

'

'

'

'

'

100.00%

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

49.95%

49.95%

'

100.00%

100.00%

49.95%

100.00%

100.00%

100.00%

100.00%

48.95%

[2]

100.00%

51.00%

100.00%

Power Generation Capacity (in MWs)

'

'

'

'

910

[3]

303

[3]

10

[3]

123

[3]

'

'

'

'

'

'

'

'

'

'

'

'

'

95

[3]

95

[3]

720

720

[3]

66

[3]

23

[3]

25

[3]

21

[3]

26

[3]

20

[3]

122

[2],[3]

5

[3]

5

[3]

101

[3]

Steam and Chilled Water Capacity, Megawatts Thermal Equivalent

'

'

'

'

'

'

'

1,098

[1],[3]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Power Generation Capacity, Reached Commercial Operations, Megawatts

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

72

'

'

'

Allocation of Corporate Expenses

'

2

4

6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Management Fee Expense

$1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

For thermal energy, net capacity represents MWt for steam or chilled water. This excludes the 123 MW of thermal generation.

[2]

As of SeptemberB 30, 2013, approximately 72 MW of net capacity had reached commercial operations.

[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 September 30, 2013.

Business_Acquisition_Details

Business Acquisition (Details) (USD $)	1 Months Ended		9 Months Ended
In Millions, unless otherwise specified	31-May-13	Sep. 30, 2013	Sep. 30, 2013	Dec. 14, 2012	Dec. 14, 2012	Oct. 31, 2010
	Marsh Landing	Marsh Landing	Marsh Landing	Marsh Landing	Marsh Landing	Marsh Landing Term Loan Facility
	year	MW			NRG	Marsh Landing
Business Acquisition	'	'	'	'	'	'
Business Acquisition, Percentage of Voting Interests Acquired	'	'	'	'	100.00%	'
Power Generation Capacity (in MWs)	'	720	'	'	'	'
Power Purchase Agreement Period	10	'	'	'	'	'
Line of Credit Facility, Maximum Borrowing Capacity	'	'	'	'	'	$650
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment	'	'	73	'	'	'
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	'	'	'	537	'	'
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment, Adjusted	'	'	'	610	'	'
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net Adjusted	'	'	'	$138	'	'

Property_Plant_and_Equipment_D

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

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Mar. 31, 2013

Feb. 13, 2013

Sep. 30, 2013

Mar. 25, 2013

Sep. 30, 2013

16-May-13

Sep. 30, 2013

Sep. 30, 2013

In Millions, unless otherwise specified

Facilities and equipment

Facilities and equipment

Land and improvements

Land and improvements

Construction in progress

Construction in progress

Avra Valley

Avra Valley

Alpine

Alpine

Borrego

Borrego

Minimum

Maximum

Facilities and equipment

Facilities and equipment

Property, Plant and Equipment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment, gross

$1,636

$1,713

$1,597

$753

$34

$30

$5

$930

'

'

'

'

'

'

'

'

Accumulated depreciation

-149

-115

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment, net

1,487

1,598

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Renewable energy grant, gross

'

'

'

'

'

'

'

'

'

27

'

72

'

39

'

'

Renewable energy grants, net

'

'

'

'

'

'

'

'

24

'

65

'

36

'

'

'

Deferred tax asset, renewable energy grant

'

'

'

'

'

'

'

'

$7

'

$19

'

$10

'

'

'

Property, plant and equipment, useful life

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'40 years

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, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2010

Jun. 30, 2011

Sep. 30, 2013

Sep. 30, 2013

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)

'

'

'

'

'

'

'

'

'

'

'

190

'

'

'

'

Number of Units Reached Commercial Operation at Peaking Generation Facilities

'

'

'

'

'

'

'

'

'

'

'

'

4

4

'

'

Equity investments in affiliates

$251

'

$251

'

$220

'

'

'

'

'

$118

'

'

'

'

'

Long-term Debt

1,167

'

1,167

'

807

'

'

'

'

'

'

'

'

'

237

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.73%

1.88%

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35

Operating revenues

95

47

227

133

'

21

20

60

59

'

'

'

'

'

'

'

Operating income

45

11

95

28

'

11

11

34

34

'

'

'

'

'

'

'

Net income/(loss)

40

4

85

8

'

8

8

23

23

'

'

'

'

'

'

'

Current assets

408

'

408

'

81

40

'

40

'

37

'

'

'

'

'

'

Non-current assets

'

'

'

'

'

457

'

457

'

459

'

'

'

'

'

'

Current liabilities

267

'

267

'

285

29

'

29

'

24

'

'

'

'

'

'

Non-current liabilities

$1,073

'

$1,073

'

$839

$231

'

$231

'

$223

'

'

'

'

'

'

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, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Jun. 30, 2012

Interest rate 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

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Affiliate

Affiliate

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]

Interest rate contracts

Commodity contracts

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 1

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Affiliate

Affiliate

Non-affiliate

Non-affiliate

Affiliate

Affiliate

Non-affiliate

Non-affiliate

Interest rate contracts

Commodity contracts

Interest rate contracts

Commodity contracts

Interest rate contracts

Commodity contracts

Fair Value of Financial Instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes receivable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$2,000,000

$6,000,000

$16,000,000

$17,000,000

'

'

$2,000,000

$6,000,000

$16,000,000

$17,000,000

'

'

'

'

Long-term debt, including current portion

1,167,000,000

'

1,167,000,000

'

807,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

26,000,000

1,167,000,000

781,000,000

1,167,000,000

781,000,000

'

'

'

'

1,170,000,000

785,000,000

'

'

'

'

'

'

'

'

Derivative Assets

7,000,000

'

7,000,000

'

0

7,000,000

'

'

7,000,000

'

'

0

'

'

7,000,000

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Liabilities

48,000,000

'

48,000,000

'

80,000,000

47,000,000

1,000,000

48,000,000

47,000,000

1,000,000

0

0

0

47,000,000

47,000,000

0

1,000,000

0

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

0

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1,000,000

'

0

0

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

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Asset, Fair Value Determined Using Valuation Techniques (as a percent)

0.00%

'

0.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Liability, Fair Value Determined Using Valuation Techniques (as a percent)

2.00%

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Concentration of Credit Risk

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

$649,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

12 Months Ended

2 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

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 contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

MMbtu

MMbtu

Dollars

Dollars

Successor

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

Natural Gas

Natural Gas

Interest

Interest

Derivative

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Underlying, Derivative

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000

2,000,000

'

'

'

Derivative, Notional Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$818

$804

'

Fair Value of Derivative Instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Assets

7

'

7

'

0

'

'

'

'

4

0

3

0

'

'

'

'

4

'

3

'

'

'

'

7

'

7

'

'

'

'

'

'

Derivative Liabilities

-48

'

-48

'

-80

'

'

'

'

-43

-68

-5

-12

-19

-14

-3

-3

-24

-54

-1

-7

-1

-2

-1

-47

'

-47

'

'

'

'

'

'

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

-41

'

-41

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-40

'

-40

'

'

'

'

'

'

Derivative Liability, Fair Value, Gross Asset

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

4

'

4

'

'

'

'

'

'

Derivative Asset, Fair Value, Gross Liability

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-4

'

-4

'

'

'

'

'

'

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

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

0

'

'

'

'

'

'

Derivative Liability, Fair Value, Amount Offset Against Collateral

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1

-43

'

-43

'

'

'

'

'

'

Derivative Asset, Fair Value, Amount Offset Against Collateral

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3

'

3

'

'

'

'

'

'

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

-41

'

-41

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-40

'

-40

'

'

'

'

'

'

Accumulated Other Comprehensive Income (Loss), Net of Tax

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated OCL beginning balance

-5

-22

-24

-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

40

4

85

8

'

0

0

3

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31

Mark-to-market of cash flow hedge accounting contracts

-3

-3

13

-11

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated OCL ending balance, net of income tax benefit of $1 and $14, respectively

-8

-25

-8

-25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-2

Accumulated OCL attributable to noncontrolling interest

-6

'

-6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated OCI ending balance, income tax of $1 and $14, respectively

1

14

1

14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

1

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Summary of Derivative Instruments Impact on Results of Operations

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrealized gain/(loss) on derivatives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1

$1

$10

$12

'

'

'

'

'

Longterm_Debt_Longterm_Debt_De

Long-term Debt Long-term Debt (Details) (USD $)

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

1 Months Ended

1 Months Ended

1 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Jan. 15, 2013

Mar. 16, 2012

Sep. 30, 2013

Mar. 16, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Mar. 31, 2013

Sep. 30, 2013

Mar. 28, 2013

Mar. 31, 2013

Sep. 30, 2013

Mar. 28, 2013

Sep. 30, 2013

Mar. 28, 2013

Mar. 31, 2013

Sep. 30, 2013

Mar. 28, 2013

Mar. 31, 2013

Mar. 28, 2013

Sep. 30, 2013

Sep. 30, 2013

Jul. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Jun. 14, 2010

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Jul. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Affiliate

Affiliate

Affiliate

Non-affiliate

Non-affiliate

NRG Marsh Landing LLC, due 2017 and 2023

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 2023

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 LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine, due 2013

NRG Solar Alpine, due 2022

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 2013

NRG Energy Center Minneapolis LLC, senior secured notes, due 2017

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

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

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 2038

South Trent Wind LLC, due 2020

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 Solar Avra Valley LLC, due 2031

NRG Solar Avra Valley LLC, due 2031

NRG Solar Avra Valley LLC, due 2031

NRG Roadrunner LLC, due 2031

NRG Roadrunner LLC, due 2031

NRG Roadrunner LLC, due 2031

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]

Note payable to NRG Energy, Inc. - South Trent

Note payable to NRG Energy, Inc. - South Trent

NRG Yield Revolving Credit Facility

Alpine

Borrego

Non-affiliate

Non-affiliate

Letter of Credit

Non-affiliate

Non-affiliate

Letter of Credit

Cash Grant Loan

Cash Grant Loan

Cash Grant Loan

Construction Loans

Construction Loans

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Interest Rate Swaps

Interest Rate Swaps

Interest Rate Swaps

Letter of Credit

Letter of Credit

Letter of Credit

Fixed Rate Notes

Fixed Rate Notes

Term Loan Facility

Term Loan Facility

Term Loan Facility

Term Loan Facility

Term Loan Facility

Non-affiliate

Non-affiliate

Promissory Note

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Affiliate

Affiliate

interest_rate_derivative

London Interbank Offered Rate (LIBOR)

London Interbank Offered Rate (LIBOR)

Long-term Debt Disclosure

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt

$1,167

$807

$0

'

$26

$1,167

$781

$500

$390

'

'

'

$223

$2

'

$62

'

'

$161

'

'

'

$129

$137

'

'

'

$79

$0

'

'

'

'

'

'

$45

'

'

$34

'

'

'

'

'

'

'

$69

$72

$34

'

$64

$66

'

$44

$46

'

$25

$25

'

$32

$41

$2

$2

$0

$26

'

'

'

Total long-term debt

1,020

749

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable rate basis

'3 month LIBOR

'

'

'

'

'

'

'

'

'

'LIBOR

'LIBOR

'

'

'

'1 month LIBOR

'

'

'

'

'LIBOR

'LIBOR

'

'

'

'

'

'

'

'3 month LIBOR

'

'

'

'

'

'

'

'3 month LIBOR

'

'

'

'

'LIBOR

'

'

'LIBOR

'

'

'

'LIBOR

'

'

'LIBOR

'

'

'LIBOR

'

'

'

'

'

'

'

'LIBOR

'

'

'

'

Basis spread on variable rate

'

'

'

'

'

'

'

'

'

'

2.50%

2.75%

'

'

'

'

'

'

'

'

2.25%

2.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.50%

'

2.50%

5.65%

'

2.63%

'

'

'

2.25%

'

'

2.01%

'

'

2.50%

'

'

6.00%

'

'

'

'

2.00%

'

'

'

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.31%

'

5.95%

'

'

'

'

'

'

'

'

'

5.65%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Current Maturities

147

58

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, minimum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.12%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, maximum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

68

'

166

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60

'

'

Credit Facility, Maximum Borrowing Capacity, Amendment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

63

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Increase, Additional Borrowings

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

62

'

'

164

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit Outstanding, Amount

'

'

'

'

'

'

'

'

'

26

'

'

'

'

37

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

242

76

Proceeds from Contributions from Parent

'

'

150

279

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

112

19

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

45

'

'

36

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Escalation Percent of Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters Of Credit, Availability Fee, Percentage Of Applicable Margin

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Interest Rate Derivatives Held

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Minimum Percent of Outstanding Notional Amount Required to Have Fixed Interest Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

75.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Fixed Interest Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.13%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional Amount of Interest Rate Derivatives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Promissory Note Conversion into Equity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stockholders_Equity_Stockholde2

Stockholders' Equity Stockholders' Equity (Details) (USD $)

0 Months Ended

2 Months Ended

9 Months Ended

1 Months Ended

0 Months Ended

0 Months Ended

2 Months Ended

0 Months Ended

In Millions, except Share data, unless otherwise specified

Jul. 22, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Jul. 22, 2013

Jul. 22, 2013

Jul. 31, 2013

Jul. 22, 2013

Sep. 30, 2013

Jul. 22, 2013

Sep. 30, 2013

Jul. 22, 2013

Jul. 22, 2013

Common Class A

Common Class B

NRG

NRG

NRG

Public Shareholders

Public Shareholders

NRG Yield LLC

NRG Yield LLC

Common Class B

Common Class B

Common Class A

Common Class A

NRG

NRG Yield, Inc.

Class of Stock

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Shares Authorized

'

'

'

'

500,000,000

500,000,000

'

'

'

'

'

'

'

Common Stock, Par Value Per Share

'

'

'

'

$0.01

$0.01

'

'

'

'

'

'

'

Sale of Stock, Number of Shares Issued in Transaction

'

'

'

'

'

'

'

42,738,750

'

22,511,250

'

'

'

Proceeds from Issuance of Common Stock

$468

'

$468

$0

'

'

'

'

'

'

'

'

'

Expense Related to Distribution or Servicing and Underwriting Fees

27

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Interest in Subsidiaries and Affiliates

'

'

'

'

'

'

395

'

'

'

'

'

'

Economic Interest in Entity

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

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

'

'

'

'

'

'

'

'

'

'

'

65.50%

34.50%

Common Stock, Shares, Outstanding

'

'

'

'

'

'

'

'

42,738,750

'

22,511,250

'

'

Common Stock, Dividends, Per Share, Declared

'

$0.23

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Dividends, Proposed Quarterly Amount, Per Share

'

$0.30

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Dividends, Proposed Annual Amount, Per Share

'

$1.20

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Shares Authorized

'

10,000,000

10,000,000

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Par or Stated Value Per Share

'

$0.01

$0.01

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling interest, balance as of December 31, 2012

'

'

0

'

'

'

'

'

'

'

'

'

'

Contributions from noncontrolling interest, net of returns of capital

'

'

393

'

'

'

'

'

'

'

'

'

'

Comprehensive income attributable to noncontrolling interest

'

20

20

'

'

'

'

'

'

'

'

'

'

Noncontrolling interest, balance as of September 30, 2013

'

$413

$413

'

'

'

'

'

'

'

'

'

'

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	2 Months Ended	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
Numerator:	'	'
Net income attributable to NRG Yield, Inc.	$9	$9
Denominator:	'	'
Weighted average number of Class A common shares outstanding	23	'
Basic and diluted loss per share:	'	'
Earnings per weighted average Class A common share b basic and diluted	$0.39	$0.39

Segment_Reporting_Details

Segment Reporting (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting	'	'	'	'	'
Operating revenues	$95	$47	$227	$133	'
Cost of operations	33	28	92	81	'
Depreciation and amortization	16	6	35	18	'
Equity in earnings of unconsolidated affiliates	12	6	18	15	'
Income/(loss) before income taxes	45	12	90	18	'
Net income/(loss)	40	4	85	8	'
Total assets	2,331	'	2,331	'	1,964
Conventional Generation	'	'	'	'	'
Segment Reporting	'	'	'	'	'
Operating revenues	32	0	51	'	'
Cost of operations	3	0	4	'	'
Depreciation and amortization	6	0	8	'	'
Equity in earnings of unconsolidated affiliates	5	3	12	'	'
Income/(loss) before income taxes	24	3	43	'	'
Net income/(loss)	24	3	43	11	'
Total assets	892	'	892	'	'
Renewables	'	'	'	'	'
Segment Reporting	'	'	'	'	'
Operating revenues	23	7	63	'	'
Cost of operations	2	1	7	'	'
Depreciation and amortization	6	3	16	'	'
Equity in earnings of unconsolidated affiliates	7	3	6	'	'
Income/(loss) before income taxes	16	3	37	'	'
Net income/(loss)	16	3	37	-2	'
Total assets	882	'	882	'	'
Thermal	'	'	'	'	'
Segment Reporting	'	'	'	'	'
Operating revenues	40	40	113	'	'
Cost of operations	28	27	81	'	'
Depreciation and amortization	4	3	11	'	'
Equity in earnings of unconsolidated affiliates	0	0	0	'	'
Income/(loss) before income taxes	6	8	15	'	'
Net income/(loss)	6	8	15	15	'
Total assets	331	'	331	'	'
Corporate	'	'	'	'	'
Segment Reporting	'	'	'	'	'
Operating revenues	0	0	0	'	'
Cost of operations	0	0	0	'	'
Depreciation and amortization	0	0	0	'	'
Equity in earnings of unconsolidated affiliates	0	0	0	'	'
Income/(loss) before income taxes	-1	-2	-5	'	'
Net income/(loss)	-6	-10	-10	-16	'
Total assets	226	'	226	'	'
Affiliate	'	'	'	'	'
Segment Reporting	'	'	'	'	'
General and administrative b affiliate	1	2	5	6	'
Affiliate | Conventional Generation	'	'	'	'	'
Segment Reporting	'	'	'	'	'
General and administrative b affiliate	0	0	0	0	'
Affiliate | Renewables	'	'	'	'	'
Segment Reporting	'	'	'	'	'
General and administrative b affiliate	0	0	0	0	'
Affiliate | Thermal	'	'	'	'	'
Segment Reporting	'	'	'	'	'
General and administrative b affiliate	0	0	0	0	'
Affiliate | Corporate	'	'	'	'	'
Segment Reporting	'	'	'	'	'
General and administrative b affiliate	$1	$2	$5	$6	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	2 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jul. 22, 2013	Jul. 22, 2013
						NRG Yield LLC	NRG Yield LLC
						NRG Yield, Inc.	NRG
Income Taxes	'	'	'	'	'	'	'
Income before income taxes	'	$45	$12	$90	$18	'	'
Income tax expense	'	5	8	5	10	'	'
Effective tax rate (as a percent)	'	11.10%	66.70%	5.60%	55.60%	'	'
Statutory income tax rate (as a percent)	'	35.00%	35.00%	35.00%	35.00%	'	'
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	'	'	'	'	'	34.50%	65.50%
Adjustment to additional paid-in capital for tax basis differences	$103	'	'	'	'	'	'

Related_Party_Transactions_Rel1

Related Party Transactions Related Party Transactions (Details) (USD $)	2 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
Management Services Agreement with NRG	'	'
Related Party Transaction	'	'
Management Services Fee, Annual	'	$1
Cost of Management Services	1	'
CVSR	'	'
Related Party Transaction	'	'
Due to Affiliate	$11	$11