10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x	Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
	For the Quarterly Period Ended: September 30, 2017
o	Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

GenOn Energy, Inc.

(Exact name of registrant as specified in its charter)

76-0655566 (I.R.S. Employer Identification No.)

Commission File Number: 001-16455

GenOn Americas Generation, LLC

(Exact name of registrant as specified in its charter)

51-0390520 (I.R.S. Employer Identification No.)

Commission File Number: 333-63240

GenOn Mid-Atlantic, LLC

(Exact name of registrant as specified in its charter)

58-2574140 (I.R.S. Employer Identification No.)

Commission File Number: 333-61668

Delaware (State or other jurisdiction of incorporation or organization)	(609) 524-4500 (Registrants' telephone number, including area code)
804 Carnegie Center, Princeton, New Jersey (Address of principal executive offices)	08540 (Zip Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. (As a voluntary filer not subject to filing requirements, the registrant nevertheless filed all reports which would have been required to be filed by Section 15(d) of the Exchange Act during the preceding 12 months had the registrant been required to file reports pursuant to Section 15(d) of the Exchange Act solely as a result of having registered debt securities under the Securities Act of 1933.)

GenOn Energy, Inc.	o	Yes	o	No
GenOn Americas Generation, LLC	o	Yes	o	No
GenOn Mid-Atlantic, LLC	o	Yes	o	No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

GenOn Energy, Inc.	x	Yes	o	No
GenOn Americas Generation, LLC	x	Yes	o	No
GenOn Mid-Atlantic, LLC	x	Yes	o	No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

	Large accelerated filer	Accelerated filer	Non-accelerated filer	Smaller reporting company	Emerging growth company
GenOn Energy, Inc.	o	o	x	o	o
GenOn Americas Generation, LLC	o	o	x	o	o
GenOn Mid-Atlantic, LLC	o	o	x	o	o
			(Do not check if a smaller reporting company)

If an emerging growth company, indicate by check mark if the Registrants have elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

GenOn Energy, Inc.	o
GenOn Americas Generation, LLC	o
GenOn Mid-Atlantic, LLC	o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

GenOn Energy, Inc.	o	Yes	x	No
GenOn Americas Generation, LLC	o	Yes	x	No
GenOn Mid-Atlantic, LLC	o	Yes	x	No

Each Registrant’s outstanding equity interests are held by its respective parent and there are no equity interests held by nonaffiliates.

Registrant	Parent
GenOn Energy, Inc.	NRG Energy, Inc.
GenOn Americas Generation, LLC	NRG Americas, Inc.
GenOn Mid-Atlantic, LLC	NRG North America LLC

This combined Form 10-Q is separately filed by GenOn Energy, Inc., GenOn Americas Generation, LLC and GenOn Mid-Atlantic, LLC. Information contained in this combined Form 10-Q relating to GenOn Energy, Inc., GenOn Americas Generation, LLC and GenOn Mid-Atlantic, LLC is filed by such registrant on its own behalf and each registrant makes no representation as to information relating to registrants other than itself.

NOTE: WHEREAS GENON MID-ATLANTIC, LLC MEETS THE CONDITIONS SET FORTH IN GENERAL INSTRUCTION H(1)(a) AND (b) OF FORM 10-Q, THIS COMBINED FORM 10-Q IS BEING FILED WITH THE REDUCED DISCLOSURE FORMAT PURSUANT TO GENERAL INSTRUCTION H(2) SOLELY WITH RESPECT TO GENON MID-ATLANTIC, LLC.

TABLE OF CONTENTS

CAUTIONARY STATEMENT REGARDING FORWARD LOOKING INFORMATION		2
GLOSSARY OF TERMS		4
PART I — FINANCIAL INFORMATION		7
	Item 1 — CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND NOTES	7
	Item 2 — MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	49
	Item 3 — QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	84
	Item 4 — CONTROLS AND PROCEDURES	85
PART II — OTHER INFORMATION		86
	Item 1 — LEGAL PROCEEDINGS	86
	Item 1A — RISK FACTORS	86
	Item 2 — UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	86
	Item 3 — DEFAULTS UPON SENIOR SECURITIES	86
	Item 4 — MINE SAFETY DISCLOSURES	86
	Item 5 — OTHER INFORMATION	86
	Item 6 — EXHIBITS	87
	SIGNATURES	89

1

CAUTIONARY STATEMENT REGARDING FORWARD LOOKING INFORMATION

(GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This Quarterly Report on Form 10-Q includes forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. The words "believe," "project," "anticipate," "plan," "expect," "intend," "estimate" and similar expressions are intended to identify forward-looking statements. These forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause the Registrants’ actual results, performance and achievements, or industry results, to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. These factors, risks and uncertainties include the factors described under Item 1A - Risk Factors, in Part I of the Registrants' Annual Report on Form 10-K for the year ended December 31, 2016, under Item 1A - Risk Factors, in Part II, Item 1A of the Registrants' Quarterly Report on Form 10-Q for the quarter ended June 30, 2017, in Part II, Item 1A herein, and the following:

• The ability of GenOn, GenOn Americas Generation and certain of their directly and indirectly-owned subsidiaries to consummate one or more plans of reorganization with respect to their Chapter 11 Cases, and to consummate the transactions contemplated by the Restructuring Support Agreement, including the ability of GenOn to successfully operate following any reorganization;

• The existence and duration of the Chapter 11 Cases, and the impact of orders and decisions of the Bankruptcy Court;

• The willingness of counterparties to transact with the Registrants during the Chapter 11 cases;

• GenOn's and certain of its subsidiaries' ability to continue as a going concern;

• The Registrants' ability to attract and retain skilled people, with the necessary applicable experience, particularly during the pendency of the Chapter 11 Cases;

• General economic conditions, changes in the wholesale power markets and fluctuations in the cost of fuel;

• Volatile power supply costs and demand for power;

• Hazards customary to the power production industry and power generation operations such as fuel and electricity price volatility, unusual weather conditions, catastrophic weather-related or other damage to facilities, unscheduled generation outages, maintenance or repairs, unanticipated changes to fuel supply costs or availability due to higher demand, shortages, transportation problems or other developments, environmental incidents, or electric transmission or gas pipeline system constraints and the possibility that the Registrants may not have adequate insurance to cover losses as a result of such hazards;

• The effectiveness of the Registrants’ risk management policies and procedures, and the ability of the Registrants’ counterparties to satisfy their financial commitments;

• Counterparties' collateral demands and other factors affecting the Registrants' liquidity position and financial condition;

• The Registrants’ ability to borrow additional funds and access capital markets, as well as GenOn’s substantial indebtedness and the possibility that the Registrants may incur additional indebtedness going forward;

• The Registrants' ability to find market participants that are willing to act as hedging counterparties;

• The Registrants’ ability to operate their businesses efficiently, manage capital expenditures and costs tightly, and generate earnings and cash flows from their asset-based businesses in relation to their debt and other obligations;

• The Registrants’ ability to enter into contracts to sell power and procure fuel on acceptable terms and prices;

• The liquidity and competitiveness of wholesale markets for energy commodities;

• Government regulation, including compliance with regulatory requirements and changes in market rules, rates, tariffs and environmental laws;

• Changes in law, including judicial decisions;

• Price mitigation strategies and other market structures employed by ISOs or RTOs that result in a failure to adequately compensate the Registrants' generation units for all of their costs;

• The Registrants' ability to mitigate forced outage risk for units subject to capacity performance requirements in PJM and performance incentives in ISO-NE;

• Operating and financial restrictions placed on the Registrants and their subsidiaries that are contained in the indentures governing GenOn’s outstanding notes, and in debt and other agreements of certain of the Registrants’ subsidiaries and project affiliates generally;

2

• The Registrants’ ability to implement their strategy of finding ways to meet the challenges of climate change, clean air and protecting natural resources while taking advantage of business opportunities;

• The Registrants’ ability to implement their strategy of increasing the return on invested capital through operational performance improvements and a range of initiatives at plants and corporate offices to reduce costs or generate revenues; and

• The Registrants’ ability to develop and maintain successful partnering relationships.

Forward-looking statements speak only as of the date they were made, and the Registrants undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. The foregoing review of factors that could cause the Registrants’ actual results to differ materially from those contemplated in any forward-looking statements included in this Quarterly Report on Form 10-Q should not be construed as exhaustive.

3

GLOSSARY OF TERMS

When the following terms and abbreviations appear in the text of this report, they have the meanings indicated below:

2016 Form 10-K	The Registrants' Annual Report on Form 10-K for the year ended December 31, 2016
Amended Plan	Amended Joint Chapter 11 Plan of Reorganization filed by the GenOn Entities on September 18, 2017
ASC	The FASB Accounting Standards Codification, which the FASB established as the source of authoritative GAAP
ASU	Accounting Standards Updates, which reflect updates to the ASC
Average realized prices	Volume-weighted average power prices, net of average fuel costs and reflecting the impact of settled hedges
Bankruptcy Code	Chapter 11 of Title 11 of the United States Bankruptcy Code
Bankruptcy Court	United States Bankruptcy Court for the Southern District of Texas, Houston Division
CAIR	Clean Air Interstate Rule
CAISO	California Independent System Operator
CenterPoint	CenterPoint Energy, Inc. and its subsidiaries, on and after August 31, 2002, and Reliant Energy, Incorporated and its subsidiaries prior to August 31, 2002
CFTC	U.S. Commodity Futures Trading Commission
Chapter 11 Cases	Voluntary cases commenced by the GenOn Entities under the Bankruptcy Code in the Bankruptcy Court
CO2	Carbon Dioxide
CPP	Clean Power Plan
CSAPR	Cross-State Air Pollution Rule
CWA	Clean Water Act
D.C. Circuit	U.S. Court of Appeals for the District of Columbia Circuit
Debt Documents	GenOn's Intercompany Revolver with NRG; the indenture governing the GenOn 7.875% Senior Notes due 2017 (as amended or supplemented from time to time); the indenture governing the GenOn 9.500% Notes due 2018 (as amended or supplemented from time to time); the indenture governing the GenOn 9.875% Notes due 2020 (as amended or supplemented from time to time); the indenture governing the GenOn Americas Generation 8.50% Senior Notes due 2021 (as amended or supplemented from time to time); and the indenture governing the GenOn Americas Generation 9.125% Senior Notes due 2031 (as amended or supplemented from time to time)
Economic gross margin	Sum of energy revenue, capacity revenue and other revenue, less cost of fuels and other cost of sales
EGU	Electric Generating Unit
ELG	Effluent Limitations Guidelines
EPA	United States Environmental Protection Agency
Exchange Act	The Securities Exchange Act of 1934, as amended
FASB	Financial Accounting Standards Board
FERC	Federal Energy Regulatory Commission
FGD	Flue gas desulfurization
FTRs	Financial Transmission Rights
FPA	Federal Power Act
GAAP	Accounting principles generally accepted in the U.S.
GenOn	GenOn Energy, Inc. and, except where the context indicates otherwise, its subsidiaries
GenOn Americas Generation	GenOn Americas Generation, LLC and, except where the context indicates otherwise, its subsidiaries
GenOn Americas Generation Senior Notes	GenOn Americas Generation's $695 million outstanding unsecured senior notes consisting of $366 million of 8.5% senior notes due 2021 and $329 million of 9.125% senior notes due 2031

4

GenOn Energy Holdings	GenOn Energy Holdings, Inc. and, except where the context indicates otherwise, its subsidiaries
GenOn Energy Management	GenOn Energy Management, LLC, a wholly owned subsidiary of GenOn Americas Generation, LLC
GenOn Entities	GenOn and certain of its wholly owned subsidiaries, including GenOn Americas Generation. that filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code in the Bankruptcy Court on June 14, 2017
GenOn Mid-Atlantic	GenOn Mid-Atlantic, LLC and, except where the context indicates otherwise, its subsidiaries, which include the coal generation units at two generating stations under operating leases
GenOn Senior Notes	GenOn's $1.8 billion outstanding unsecured senior notes consisting of $691 million of 7.875% senior notes due 2017, $649 million of 9.5% senior notes due 2018, and $490 million of 9.875% senior notes due 2020
GHG	Greenhouse Gases
GW	Gigawatts
HAPs	Hazardous Air Pollutants
ICE	Intercontinental Exchange
ISO	Independent System Operator, also referred to as RTO
ISO-NE	ISO New England Inc.
LIBOR	London Interbank Offered Rate
MATS	Mercury and Air Toxics Standards promulgated by the EPA
MC Asset Recovery	MC Asset Recovery, LLC
MDE	Maryland Department of the Environment
Mirant	GenOn Energy Holdings, Inc. (formerly known as Mirant Corporation) and, except where the context indicates otherwise, its subsidiaries
Mirant/RRI Merger	The merger completed on December 3, 2010 of Mirant Corporation and RRI Energy Inc. to form GenOn Energy, Inc.
Mirant Debtors	GenOn Energy Holdings, Inc. (formerly known as Mirant Corporation) and certain of its subsidiaries
MISO	Midcontinent Independent System Operator, Inc.
MMBtu	Million British Thermal Units
MW	Megawatts
MWh	Saleable megawatt hours net of internal/parasitic load megawatt-hours
NAAQS	National Ambient Air Quality Standards
Net Exposure	Counterparty credit exposure to GenOn, GenOn Americas Generation or GenOn Mid-Atlantic, as applicable, net of collateral
NERC	North American Electric Reliability Corporation
NOx	Nitrogen Oxides
NPDES	National Pollution Discharge Elimination System
NPNS	Normal Purchase Normal Sale
NRG	NRG Energy, Inc. and, except where the context indicates otherwise, its subsidiaries
NRG Merger	The merger completed on December 14, 2012, whereby GenOn became a wholly owned subsidiary of NRG
NYISO	New York Independent System Operator
NYMEX	New York Mercantile Exchange
OCI	Other Comprehensive Income/(Loss)
PER	Peak Energy Rent
Petition Date	June 14, 2017
PJM	PJM Interconnection, LLC
Plan	Joint Chapter 11 Plan of Reorganization of the GenOn Entities filed on June 29, 2017 and as amended on September 18, 2017 and October 2, 2017
PUCO	Public Utility Commission of Ohio

5

RCRA	Resource Conservation and Recovery Act of 1976
Registrants	GenOn, GenOn Americas Generation and GenOn Mid-Atlantic, collectively
REMA	NRG REMA LLC (formerly known as GenOn REMA, LLC)
Restructuring Support Agreement	Restructuring Support and Lock-Up Agreement, dated as of June 12, 2017 and as amended by the first amendment thereto on October 2, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, the subsidiaries signatory thereto, NRG Energy, Inc. and the noteholders signatory thereto
RTO	Regional Transmission Organization
Second Amended Plan	Second Amended Joint Chapter 11 Plan of Reorganization of the GenOn Entities filed on October 2, 2017
Securities Act	The Securities Act of 1933, as amended
Settlement Agreement	A settlement agreement and any other documents necessary to effectuate the settlement among NRG, GenOn, and certain holders of senior unsecured notes of GenOn Americas Generation and GenOn, and certain of GenOn's direct and indirect subsidiaries
Seward	The Seward Generating Station, a 525 MW coal-fired facility in Pennsylvania
Shelby	The Shelby County Generating Station, a 352 MW natural gas-fired facility in Illinois
SO2	Sulfur Dioxide
U.S.	United States of America

6

PART I - FINANCIAL INFORMATION

ITEM 1 - CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND NOTES

GENON ENERGY, INC. AND SUBSIDIARIES

(Debtor-In-Possession)

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	(In millions)
Operating Revenues
Operating revenues	$	483		$	544		$	1,161		$	1,515
Operating revenues — affiliate	1			(12		)	70			(6		)
Total operating revenues	484			532			1,231			1,509
Operating Costs and Expenses
Cost of operations	224			279			650			864
Cost of operations — affiliate	90			74			226			180
Depreciation and amortization	43			59			128			153
Impairment losses	—			—			—			59
General and administrative	11			10			26			14
General and administrative — affiliate	14			46			100			139
Total operating costs and expenses	382			468			1,130			1,409
Gain on sale of assets	—			262			—			294
Operating Income	102			326			101			394
Other Income/(Expense)
Other income, net	3			2			9			6
Interest expense	(2		)	(41		)	(83		)	(123		)
Interest expense — affiliate	(2		)	(3		)	(8		)	(9		)
Other expense	—			—			(18		)	—
Total other expense	(1		)	(42		)	(100		)	(126		)
Income Before Reorganization Items and Income Taxes	101			284			1			268
Reorganization items, net	(29		)	—			48			—
Income Before Income Taxes	72			284			49			268
Income tax expense	—			21			7			20
Net Income	$	72		$	263		$	42		$	248

See accompanying notes to condensed consolidated financial statements.

7

GENON ENERGY, INC. AND SUBSIDIARIES

(Debtor-In-Possession)

CONDENSED CONSOLIDATED BALANCE SHEETS

	September 30, 2017			December 31, 2016
	(unaudited)
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	810		$	1,034
Restricted cash	1			—
Accounts receivable	124			109
Inventory	375			389
Derivative instruments	29			54
Derivative instruments — affiliate	10			54
Cash collateral posted in support of energy risk management activities	47			53
Cash collateral posted in support of energy risk management activities — affiliate	25			79
Prepaid rent and other current assets	151			128
Total current assets	1,572			1,900
Property, plant and equipment, net	2,468			2,543
Other Assets
Intangible assets, net	26			62
Derivative instruments	16			16
Derivative instruments — affiliate	1			—
Long-term deposits	130			—
Prepaid rent — non-current	352			245
Other non-current assets	136			94
Total other assets	661			417
Total Assets	$	4,701		$	4,860
LIABILITIES AND STOCKHOLDER'S EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	1		$	704
Accounts payable	79			113
Accounts payable — affiliate	27			78
Derivative instruments	26			46
Derivative instruments — affiliate	9			59
Accrued expenses and other current liabilities	128			191
Total current liabilities	270			1,191
Liabilities Subject to Compromise	2,862			—
Other Liabilities
Long-term debt and capital leases	1			2,050
Long-term debt — affiliate	125			—
Derivative instruments	2			10
Derivative instruments — affiliate	4			7
Out-of-market contracts	753			811
Other non-current liabilities	289			451
Total non-current liabilities	1,174			3,329
Total Liabilities	4,306			4,520
Commitments and Contingencies
Stockholder's Equity
Common stock: $0.001 par value, 1 share authorized and issued at September 30, 2017 and December 31, 2016	—			—
Additional paid-in capital	338			325
Retained earnings	86			44
Accumulated other comprehensive loss	(29		)	(29		)
Total Stockholder's Equity	395			340
Total Liabilities and Stockholder's Equity	$	4,701		$	4,860

See accompanying notes to condensed consolidated financial statements.

8

GENON ENERGY, INC. AND SUBSIDIARIES

(Debtor-In-Possession)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Nine months ended September 30,
	2017			2016
	(In millions)
Cash Flows from Operating Activities
Net Income	$	42		$	248
Adjustments to reconcile net income to net cash (used)/provided by operating activities:
Depreciation and amortization	128			153
Amortization of debt premiums	(24		)	(39		)
Loss on financing arrangement for 2022 Notes	18			—
Non-cash adjustment to write-off unamortized debt premiums	(107		)	—
Amortization of out-of-market contracts and emission allowances	(59		)	(58		)
Gain on sale of assets	—			(294		)
Impairment losses	—			59
Changes in derivative instruments	(13		)	175
Changes in collateral deposits supporting energy risk management activities	60			(112		)
Proceeds from sale of emission allowances	—			36
Lower of cost or market inventory adjustments	2			—
Changes in other working capital	(100		)	22
Net Cash (Used)/Provided by Operating Activities	(53		)	190
Cash Flows from Investing Activities
Capital expenditures	(69		)	(239		)
Proceeds from sale of assets, net	—			563
Other	—			2
Net Cash (Used)/Provided by Investing Activities	(69		)	326
Cash Flows from Financing Activities
Payment for credit support	(130		)	—
Payments for financing costs	(94		)	—
Proceeds from draw on intercompany secured revolving credit facility	125			—
Payments for current and long-term debt	(2		)	(4		)
Net Cash Used by Financing Activities	(101		)	(4		)
Net (Decrease)/Increase in Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties	(223		)	512
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at Beginning of Period	1,034			716
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at End of Period	$	811		$	1,228

See accompanying notes to condensed consolidated financial statements.

9

GENON AMERICAS GENERATION, LLC AND SUBSIDIARIES

(Debtor-In-Possession)

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	(In millions)
Operating Revenues
Operating revenues	$	402		$	494		$	1,003		$	1,362
Operating revenues — affiliate	27			56			77			16
Total operating revenues	429			550			1,080			1,378
Operating Costs and Expenses
Cost of operations	126			160			349			496
Cost of operations — affiliate	238			276			588			647
Depreciation and amortization	18			21			54			59
General and administrative	6			—			6			—
General and administrative — affiliate	9			21			53			62
Total operating costs and expenses	397			478			1,050			1,264
Gain on sale of assets	—			74			—			77
Operating Income	32			146			30			191
Other Income/(Expense)
Other income, net	1			1			2			2
Interest expense	(1		)	(14		)	(24		)	(39		)
Interest expense — affiliate	—			(1		)	(2		)	(5		)
Total other expense	—			(14		)	(24		)	(42		)
Income Before Reorganization Items and Income Taxes	32			132			6			149
Reorganization items, net	—			—			42			—
Income Before Income Taxes	32			132			48			149
Income tax	—			—			—			—
Net Income	$	32		$	132		$	48		$	149

See accompanying notes to condensed consolidated financial statements.

10

GENON AMERICAS GENERATION, LLC AND SUBSIDIARIES

(Debtor-In-Possession)

CONDENSED CONSOLIDATED BALANCE SHEETS

	September 30, 2017		December 31, 2016
	(unaudited)
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	174	$	471
Accounts receivable	111		85
Note receivable — affiliate	318		315
Inventory	236		245
Derivative instruments	29		54
Derivative instruments — affiliate	40		126
Cash collateral posted in support of energy risk management activities	45		51
Cash collateral posted in support of energy risk management activities — affiliates	25		79
Prepaid rent and other current assets	95		77
Total current assets	1,073		1,503
Property, plant and equipment, net	1,058		1,088
Other Assets
Intangible assets, net	26		62
Derivative instruments	16		16
Derivative instruments — affiliate	9		18
Long-term deposits	130		—
Prepaid rent — non-current	278		204
Other non-current assets	28		11
Total other assets	487		311
Total Assets	$	2,618	$	2,902
LIABILITIES AND MEMBER'S EQUITY
Current Liabilities
Accounts payable	$	39	$	61
Accounts payable — affiliate	20		116
Derivative instruments	26		46
Derivative instruments — affiliate	45		139
Accrued expenses and other current liabilities	54		94
Total current liabilities	184		456
Liabilities Subject to Compromise	721		—
Other Liabilities
Long-term debt	—		745
Derivative instruments	2		10
Derivative instruments — affiliate	21		22
Out-of-market contracts	471		492
Other non-current liabilities	118		124
Total non-current liabilities	612		1,393
Total Liabilities	1,517		1,849
Commitments and Contingencies
Member’s Equity
Member’s interest	1,101		1,053
Total Member’s Equity	1,101		1,053
Total Liabilities and Member’s Equity	$	2,618	$	2,902

See accompanying notes to condensed consolidated financial statements.

11

GENON AMERICAS GENERATION, LLC AND SUBSIDIARIES

(Debtor-In-Possession)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Nine months ended September 30,
	2017			2016
	(In millions)
Cash Flows from Operating Activities
Net Income	$	48		$	149
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	54			59
Amortization of debt premiums	(3		)	(5		)
Non-cash adjustment to write-off unamortized debt premiums	(47		)	—
Amortization of out-of-market contracts and emission allowances	(21		)	(20		)
Gain on sale of assets	—			(77		)
Changes in derivative instruments	(3		)	182
Changes in collateral deposits supporting energy risk management activities	60			(119		)
Lower of cost or market inventory adjustments	2			—
Changes in other working capital	(80		)	(16		)
Net Cash Provided by Operating Activities	10			153
Cash Flows from Investing Activities
Capital expenditures	(33		)	(44		)
Increase in notes receivable — affiliate	(3		)	—
Proceeds from sale of assets	—			76
Net Cash (Used)/Provided by Investing Activities	(36		)	32
Cash Flows from Financing Activities
Payment for amounts due to GenOn Energy, Inc.	(125		)	—
Payment for credit support	(130		)	—
Payments for financing costs	(16		)	—
Net Cash Used by Financing Activities	(271		)	—
Net (Decrease)/Increase in Cash, Cash Equivalents and Funds Deposited by Counterparties	(297		)	185
Cash, Cash Equivalents and Funds Deposited by Counterparties at Beginning of Period	471			297
Cash, Cash Equivalents and Funds Deposited by Counterparties at End of Period	$	174		$	482

See accompanying notes to condensed consolidated financial statements.

12

GENON MID-ATLANTIC, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	(In millions)
Operating Revenues
Operating revenues	$	1		$	1		$	1		$	1
Operating revenues — affiliate	129			229			365			584
Total operating revenues	130			230			366			585
Operating Costs and Expenses
Cost of operations	104			157			273			414
Cost of operations — affiliate	6			(10		)	30			21
Depreciation and amortization	16			16			47			45
General and administrative	6			—			6			—
General and administrative — affiliate	4			15			42			45
Total operating costs and expenses	136			178			398			525
Operating (Loss)/Income	(6		)	52			(32		)	60
Other Expense
Other income, net	1			1			1			1
Interest expense	(1		)	(1		)	(1		)	(1		)
Interest expense — affiliate	—			(1		)	(1		)	(3		)
Total other expense	—			(1		)	(1		)	(3		)
(Loss)/Income Before Income Taxes	(6		)	51			(33		)	57
Income tax	—			—			—			—
Net (Loss)/Income	$	(6	)	$	51		$	(33	)	$	57

See accompanying notes to condensed consolidated financial statements.

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GENON MID-ATLANTIC, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

	September 30, 2017		December 31, 2016
	(unaudited)
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	175	$	471
Accounts receivable	1		8
Accounts receivable — affiliate	6		—
Inventory	127		135
Derivative instruments — affiliate	10		44
Prepaid rent and other current assets	83		73
Total current assets	402		731
Property, plant and equipment, net	902		926
Other Assets
Intangible assets, net	10		10
Derivative instruments — affiliate	2		4
Long-term deposits	130		—
Prepaid rent — non-current	280		204
Total other assets	422		218
Total Assets	$	1,726	$	1,875
LIABILITIES AND MEMBER'S EQUITY
Current Liabilities
Accounts payable	$	19	$	30
Accounts payable — affiliate	—		29
Derivative instruments — affiliate	14		44
Accrued expenses and other current liabilities	42		69
Total current liabilities	75		172
Other Liabilities
Derivative instruments — affiliate	—		2
Out-of-market contracts	471		492
Other non-current liabilities	63		59
Total non-current liabilities	534		553
Total Liabilities	609		725
Commitments and Contingencies
Member’s Equity
Member’s interest	1,117		1,150
Total Member’s Equity	1,117		1,150
Total Liabilities and Member’s Equity	$	1,726	$	1,875

See accompanying notes to condensed consolidated financial statements.

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GENON MID-ATLANTIC, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Nine months ended September 30,
	2017			2016
	(In millions)
Cash Flows from Operating Activities
Net (Loss)/Income	$	(33	)	$	57
Adjustments to reconcile net (loss)/income to net cash (used)/provided by operating activities:
Depreciation and amortization	47			45
Amortization of out-of-market contracts and emission allowances	(21		)	(21		)
Changes in derivative instruments	4			160
Lower of cost or market inventory adjustment	2			—
Changes in other working capital	(9		)	(17		)
Net Cash (Used)/Provided by Operating Activities	(10		)	224
Cash Flows from Investing Activities
Capital expenditures	(30		)	(40		)
Net Cash Used by Investing Activities	(30		)	(40		)
Cash Flows from Financing Activities
Payment for amounts due to GenOn Energy, Inc.	(125		)	—
Payment for credit support	(130		)	—
Payments for deferred financing costs	(1		)	—
Net Cash Used by Financing Activities	(256		)	—
Net (Decrease)/Increase in Cash and Cash Equivalents	(296		)	184
Cash and Cash Equivalents at Beginning of Period	471			299
Cash and Cash Equivalents at End of Period	$	175		$	483

See accompanying notes to condensed consolidated financial statements.

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GENON ENERGY, INC. AND SUBSIDIARIES

(Debtor-In-Possession)

GENON AMERICAS GENERATION, LLC AND SUBSIDIARIES

(Debtor-In-Possession)

GENON MID-ATLANTIC, LLC AND SUBSIDIARIES

COMBINED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1 — Basis of Presentation (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

GenOn Energy, Inc., a wholly owned subsidiary of NRG, is a wholesale power generator engaged in the ownership and operation of power generation facilities, with 15,395 MW of net electric generating capacity located in the U.S. On January 1, 2017, GenOn Americas Generation deactivated Pittsburg which resulted in the decrease in operating generation capacity of 1,029 MW from December 31, 2016.

GenOn Americas Generation is a wholesale power generator with 6,878 MW of net electric generating capacity located, in many cases, near major metropolitan areas. GenOn Americas Generation's electric generating capacity is part of the 15,395 MW of net electric generating capacity of GenOn.

GenOn Mid-Atlantic operates and owns or leases 4,605 MW of net electric generating capacity in Maryland near Washington, D.C. GenOn Mid-Atlantic’s electric generating capacity is part of the 6,878 MW of net electric generating capacity of GenOn Americas Generation. GenOn Mid-Atlantic’s generating stations serve the Eastern PJM markets.

GenOn Americas Generation and GenOn Mid-Atlantic are Delaware limited liability companies and indirect wholly owned subsidiaries of GenOn. GenOn Mid-Atlantic is an indirect wholly owned subsidiary of GenOn Americas Generation.

The Registrants sell power from their generation portfolio, offer capacity or similar products to retail electric providers and others, and provide ancillary services to support system reliability.

Chapter 11 Cases

As further described in Note 3, Chapter 11 Cases, on June 14, 2017, GenOn, along with GenOn Americas Generation and certain of their directly and indirectly-owned subsidiaries, or collectively the GenOn Entities, filed voluntary petitions for relief under Chapter 11, or the Chapter 11 Cases, of the United States Bankruptcy Code, or the Bankruptcy Code, in the United States Bankruptcy Court for the Southern District of Texas, Houston Division, or the Bankruptcy Court. GenOn Mid-Atlantic, as well as its consolidated subsidiaries, REMA and certain other subsidiaries, did not file for relief under Chapter 11.

The GenOn Entities remain in possession of their property and continue their business operations in the ordinary course uninterrupted as "debtors-in-possession" under jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court. The consolidated financial statements for GenOn and GenOn Americas Generation were prepared in accordance with Accounting Standards Codification (ASC) 852, Reorganizations, for debtors-in-possession.

On June 29, 2017, the GenOn Entities filed a Joint Plan of Reorganization pursuant to Chapter 11 of the Bankruptcy Code (as may be amended, modified or supplemented from time to time), or the Plan, and a related Disclosure Statement, or the Disclosure Statement, with the Bankruptcy Court consistent with the restructuring support and lock-up agreement, or Restructuring Support Agreement, by and among the GenOn Entities, NRG, certain holders representing greater than 93% in aggregate principal amount of GenOn’s Senior Notes and certain holders representing greater than 93% in aggregate principal amount of GenOn Americas Generation’s Senior Notes, as further described in Note 3, Chapter 11 Cases.

Liquidity and Ability to Continue as a Going Concern

As described above and in Note 3, Chapter 11 Cases, the GenOn Entities have submitted the Plan in connection with the Chapter 11 Cases. There is no assurance that such Plan will be approved by the requisite stakeholders, confirmed by the Bankruptcy Court, or successfully implemented thereafter. GenOn's and GenOn Americas Generation’s ability to continue as a going concern is dependent on many factors, including the successful confirmation of the Plan and emergence from bankruptcy. Given the uncertainty as to the outcome of these factors, there is substantial doubt about GenOn's and GenOn Americas Generation's ability to continue as a going concern.

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The accompanying unaudited interim condensed consolidated financial statements have been prepared assuming GenOn will continue as a going concern, which contemplates continuity of operations, realization of assets and the satisfaction of liabilities in the normal course of business. As such, the accompanying unaudited interim condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of assets and their carrying amounts, or the amount and classification of liabilities that may result should GenOn be unable to continue as a going concern. Such adjustments could have a material adverse impact on GenOn's results of operations, cash flows and financial position.

With respect to GenOn Mid-Atlantic, a consolidated subsidiary of GenOn, management has determined that while it has sufficient cash on hand to fund current obligations including operating lease payments due under the GenOn Mid-Atlantic operating leases as of September 30, 2017, the potential significant adverse impact of financial stresses at GenOn Mid-Atlantic's parent companies and any adverse impact resulting from the notification by GenOn Mid-Atlantic's owner lessors alleging the existence of certain lease events of default as further described in Note 8, Debt and Capital Leases, has caused there to be substantial doubt about GenOn Mid-Atlantic's ability to continue as a going concern.

Basis of Presentation

This is a combined quarterly report of the Registrants for the quarter ended September 30, 2017. The notes to the condensed consolidated financial statements apply to the Registrants as indicated parenthetically next to each corresponding disclosure. The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with the SEC's regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the financial statements in the Registrants' 2016 Form 10-K. Interim results are not necessarily indicative of results for a full year.

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

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

Reclassifications

Certain prior year amounts have been reclassified for comparative purposes.  The reclassifications did not affect results from operations, net assets or cash flows. 

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Note 2 — Summary of Significant Accounting Policies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Other Balance Sheet Information (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

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

	Property, plant and equipment Accumulated depreciation				Intangible assets Accumulated amortization
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
GenOn	$	730	$	604	$	66	$	87
GenOn Americas Generation	329		275		66		87
GenOn Mid-Atlantic	284		237		33		29

Recent Accounting Developments — Guidance Adopted in 2017 (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

ASU 2016-18 — In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash, or ASU No. 2016-18. The amendments of ASU No. 2016-18 require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts on the statement of cash flows. For GenOn and GenOn Americas Generation, this includes amounts classified as funds deposited by counterparties. The amendments of ASU No. 2016-18 are effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods.  Early adoption is permitted and the adoption of ASU No. 2016-18 will be applied retrospectively. GenOn and GenOn Americas Generation adopted the guidance in ASU No. 2016-18 during the second quarter of 2017. In connection with the adoption of the standard, the Registrants have applied the guidance retrospectively which resulted in a decrease of the cash flows provided by operating activities of $41 million for the nine months ended September 30, 2016 for GenOn and GenOn Americas Generation. The adoption of ASU No. 2016-18 did not have an impact to GenOn Mid-Atlantic's statement of cash flows.

Recent Accounting Developments — Guidance Not Yet Adopted (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

ASU 2017-12 — In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities, or ASU No. 2017-12. The amendments of ASU No. 2017-12 were issued to simplify the application of hedge accounting guidance and more closely align financial reporting for hedging relationships with economic results of an entity's risk management activities. The issues addressed by ASU No. 2017-12 include but are not limited to alignment of risk management activities and financial reporting, risk component hedging, accounting for the hedged item in fair value hedges of interest rate risk, recognition and presentation of the effects of hedging instruments, amounts excluded from the assessment of hedge effectiveness, and other simplifications of hedge accounting guidance. The amendments of ASU No. 2017-12 are effective for fiscal years beginning after December 15, 2018, and interim periods therein.  Early adoption is permitted in any interim period and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The Registrants do not expect the adoption of ASU No. 2017-12 will have a material impact on their consolidated results of operations, cash flows, and statement of financial position.

ASU 2017-07 — In March 2017, the FASB issued ASU No. 2017-07, Compensation — Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, or ASU No. 2017-07.   Current GAAP does not indicate where the amount of net benefit cost should be presented in an entity’s income statement and does not require entities to disclose the amount of net benefit cost that is included in the income statement.  The amendments of ASU No. 2017-07 require an entity to report the service cost component of net benefit costs in the same line item as other compensation costs arising from services rendered by the related employees during the applicable service period.  The other components of net benefit cost are required to be presented separately from the service cost component and outside the subtotal of income from operations. Further, ASU No. 2017-07 prescribes that only the service cost component of net benefit costs is eligible for capitalization. The amendments of ASU No. 2017-07 are effective for fiscal years beginning after December 15, 2017, including interim periods therein.  Early adoption is permitted and must be applied on a retrospective basis, except for the amendments regarding the capitalization of the service cost component, which must be applied prospectively. GenOn is currently assessing the impact that the adoption of ASU No. 2017-07 will have on its results of operations, cash flows, and statement of financial position.

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

ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or Topic 606, which was further amended through various updates issued by the FASB thereafter. The amendments of Topic 606 completed the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. The guidance under Topic 606 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes a five step model to be applied by an entity in evaluating its contracts with customers. The Registrants expect to adopt the standard effective January 1, 2018 and apply the guidance retrospectively to contracts at the date of adoption. The Registrants will recognize the cumulative effect of applying Topic 606 at the date of initial application, as prescribed under the modified retrospective transition method. The Registrants also expect to elect the practical expedient available under Topic 606 for measuring progress toward complete satisfaction of a performance obligation and for disclosure requirements of remaining performance obligations. The practical expedient allows an entity to recognize revenue in the amount to which the entity has the right to invoice such that the entity has a right to the consideration in an amount that corresponds directly with the value to the customer for performance completed to date by the entity. In 2016, the Registrants continued to assess the new standard with a focus on identifying the performance obligations included within its revenue arrangements with customers and evaluating the Registrants' methods of estimating the amount and timing of variable consideration. While the impact remains subject to continued review, the Registrants do not believe the adoption of Topic 606 will have a material impact on their financial statements.

Note 3 — Chapter 11 Cases(GenOn and GenOn Americas Generation)

Chapter 11 Cases

On June 14, 2017, or the Petition Date, the GenOn Entities filed the Chapter 11 Cases. GenOn Mid-Atlantic, as well as its consolidated subsidiaries, REMA, and certain other subsidiaries, did not file for relief under Chapter 11.

The GenOn Entities remain in possession of their property and continue their business operations in the ordinary course uninterrupted as "debtors-in-possession" under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court.

On June 29, 2017, the GenOn Entities filed the Plan and the Disclosure Statement with the Bankruptcy Court consistent with the Restructuring Support Agreement. On September 18, 2017 and October 2, 2017, the GenOn Entities filed the Amended Plan and Amended Disclosure Statement and Second Amended Plan and Second Amended Disclosure Statement, respectively, which primarily provided the GenOn Entities with the flexibility to complete sales of certain assets pursuant to the Amended Plan and removed the GenOn Entities' requirement to conduct a rights offering in connection with the GenOn Entities' exit financing.

On October 31, 2017, the GenOn Entities announced that they entered into a Consent Agreement with certain holders of GenOn’s Senior Notes and GenOn Americas Generation's Senior Notes, collectively, the Consenting Holders, whereby the GenOn Entities and the Consenting Holders have agreed to extend the milestones in the Restructuring Support Agreement, by which the Plan must become effective, or the Effective Date. Specifically, the Consent Agreement extends the Effective Date milestone to June 30, 2018 or September 30, 2018, if regulatory approvals are still pending, or the Extended Effective Dates. The Consenting Holders’ consent to the Extended Effective Dates is contingent upon entry of an order as described in the Consent Agreement.

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In addition, the GenOn Entities announced that, over the course of the past several weeks, both the principals and advisors of NRG and GenOn have been engaged in lengthy in-person negotiations in an effort to settle certain items that remained open and unresolved after the pre-petition Restructuring Support Agreement negotiations. These arms-length discussions included key topics such as: (i) timeline and transition, (ii) cooperation and co-development matters, (iii) post-employment and retiree health and welfare benefits and pension benefits, (iv) tax matters, and (v) intercompany balances. The agreements reached on these topics will be incorporated into definitive documents for GenOn’s emergence from Chapter 11.

On October 30, 2017, the GenOn Entities filed the Plan Supplement Documents, consisting of, among other things, new organizational documents, new exit financing documents, a pension indemnity agreement, an employee matters agreement, schedules of assumed and rejected executory contracts and unexpired leases, and the Backstop Commitment Letter.  The Plan Supplement Documents are subject to ongoing review, revision, and further negotiation by the parties to the Restructuring Support Agreement including the GenOn Debtors, Consenting Holders and NRG, who have various consent rights over the final form of the Plan Supplement Documents, and may be amended, modified, supplemented, and revised in accordance with those ongoing negotiations.

Restructuring Support Agreement

Prior to filing the Chapter 11 Cases, the GenOn Entities entered into the Restructuring Support Agreement on June 12, 2017 that provides for a restructuring and recapitalization of the GenOn Entities through a prearranged plan of reorganization. Completion of the agreed upon terms is contingent upon certain milestones in the Restructuring Support Agreement. Certain principal terms of the Restructuring Support Agreement are detailed below:

1) Full releases from GenOn and GenOn Americas Generation in favor of NRG, including either a full release or indemnification in favor of NRG for any claims relating to GenOn Mid-Atlantic or REMA and the dismissal of all litigation against NRG.

2) GenOn will receive cash consideration from NRG of $261.3 million pursuant to a settlement executed in connection with the Plan, which will be received in cash less any amounts owed to NRG under the intercompany secured revolving credit facility, or the Intercompany Revolver. As of September 30, 2017, GenOn owed NRG approximately $125 million under the Intercompany Revolver. See Note 10, Related Party Transactions, for further discussion of the Intercompany Revolver.

3) NRG will consent to the cancellation of its interests in the equity of GenOn. The equity interests in the reorganized GenOn will be issued to the holders of the GenOn Senior Notes along with a cash payment from NRG equal to approximately $75 million, which is included in the $261.3 million mentioned above, and, subject to certain eligibility restrictions, rights to participate pro rata in a new secured notes offering, as further described below.

4) NRG will retain the pension liability, including payment of approximately $13 million of 2017 pension contributions, for GenOn employees for service provided prior to the completion of the reorganization, which was paid in September 2017 and was reflected as a capital contribution to GenOn. GenOn’s pension liability as of September 30, 2017 was approximately $106 million.

5) The shared services agreement between GenOn and NRG will be amended such that (i) GenOn will receive shared services from NRG at an annualized rate of $84 million during the pendency of the Chapter 11 Cases, (ii) if the settlement is approved by the bankruptcy court, GenOn will receive shared services from NRG at no charge for two months, and (iii) NRG will then provide an option for up to two, one-month extensions for shared services at an annualized rate of $84 million. See Note 10, Related Party Transactions, for further discussion of the shared services agreement.

6) GenOn will receive a credit of approximately $28 million from NRG to apply against amounts owed under the shared services agreement upon emergence from bankruptcy. Any unused amount can be paid in cash at GenOn's request. The credit is specifically equal to the amount of the 4% aggregate principal amount of the new senior secured first lien notes due 2022, or the 2022 Notes, plus accrued interest from the date of entry into the escrow agreement entered into in connection with the 2022 Notes and is intended to reimburse GenOn for its payment of such amount, as described below.

7) NRG agreed to provide GenOn with a letter of credit facility during the pendency of the Chapter 11 Cases, which could be utilized for required letters of credit in lieu of the Intercompany Revolver. GenOn can no longer utilize the Intercompany Revolver and, on July 27, 2017, the letter of credit facility was terminated, as GenOn had obtained a separate letter of credit facility with a third party financial institution. See Note 10, Related Party Transactions, for further discussion of the Intercompany Revolver and the letter of credit facility and Note 8, Debt and Capital Leases, for the letter of credit facility obtained in July 2017.

8) Certain holders of the Senior Notes, known as the Backstop Parties, have executed a letter of commitment, or the Backstop Commitment Letter, pursuant to which the Backstop Parties committed to backstop the exit financing obtained by GenOn to facilitate the payment of the obligations under the Plan and other working capital needs of the GenOn Entities upon their emergence from Chapter 11.

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9) GenOn and NRG have agreed to cooperate in good faith to maximize the value of certain development projects.

In addition to the Restructuring Support Agreement, additional support and other agreements are being negotiated, including a transition services agreement.

The filing of the Chapter 11 Cases automatically stayed most actions against the GenOn Entities pursuant to Section 362(a) of the Bankruptcy Code. Absent an order from the Bankruptcy Court, the GenOn Entities' pre-petition liabilities are subject to settlement under the Plan.

The GenOn Entities have filed certain motions with the Bankruptcy Court that have been approved. The GenOn Entities expect to operate in the normal course of business throughout the reorganization process. The GenOn Entities have continued to make payments to certain vendors with respect to pre-petition liabilities as permitted by the Bankruptcy Court order, and vendors have been paid for goods and services provided after the Petition Date in the ordinary course of business.

GenOn Debt

As of September 30, 2017, the Intercompany Revolver, GenOn Senior Notes, and GenOn Americas Generation Senior Notes totaled approximately $2.6 billion. The filing of the Chapter 11 Cases constitutes an event of default under the following debt instruments, or collectively, the Debt Documents:

1) The Intercompany Revolver with NRG;

2) The indenture governing the GenOn 7.875% Senior Notes due 2017 (as amended or supplemented from time to time);

3) The indenture governing the GenOn 9.500% Notes due 2018 (as amended or supplemented from time to time);

4) The indenture governing the GenOn 9.875% Notes due 2020 (as amended or supplemented from time to time);

5) The indenture governing the GenOn Americas Generation 8.50% Senior Notes due 2021 (as amended or supplemented from time to time); and

6) The indenture governing the GenOn Americas Generation 9.125% Senior Notes due 2031 (as amended or supplemented from time to time).

The Debt Documents set forth in 1-4 above provide that as a result of the commencement of the Chapter 11 Cases the principal and accrued interest due thereunder was immediately due and payable. The Debt Documents set forth in 5-6 above provide that as a result of the commencement of the Chapter 11 Cases the applicable indenture trustee or certain holders of the notes may declare the principal and accrued interest due thereunder to be immediately due and payable.  Any efforts to enforce such payment obligations under the Debt Documents were automatically stayed as a result of the commencement of the Chapter 11 Cases, and the holders’ rights of enforcement in respect of the Debt Documents are subject to the applicable provisions of the Bankruptcy Code. The Chapter 11 Cases could also potentially give rise to counterparty rights and remedies under other documents. For further discussion, see Note 8, Debt and Capital Leases and Note 11, Commitments and Contingencies.

2022 Notes

On May 8, 2017, a remote special purpose limited liability company issued $550 million in principal amount of notes that bore interest at a rate of 10.5% with a maturity date of June 1, 2022. The proceeds were deposited into a separate and independently maintained escrow account along with 4% of the principal amount and accrued interest from May 8, 2017 through June 15, 2017 totaling $28 million. If certain conditions were satisfied, GenOn was expected to merge with the remote special purpose limited liability company and assume the obligation for the 2022 Notes, which were to be secured by certain of GenOn’s and its subsidiaries' assets. Based on the terms of the underlying transaction documents governing the 2022 Notes, on June 14, 2017, when GenOn filed the Chapter 11 Cases, the funds held in the escrow account were released to the holders of the 2022 Notes, which were simultaneously redeemed. In connection with the escrow release, GenOn expensed $18 million in fees incurred in connection with the 2022 Notes offering in other expense. These fees, along with the $28 million that will be reimbursed by NRG, as further described in Note 10, Related Party Transactions, for total of $46 million, are reflected as financing costs in the statement of cash flows.

Backstop Fee

The Restructuring Support Agreement also contemplates $900 million in aggregate principal amount of exit financing sought by GenOn primarily to refinance existing indebtedness and pay distributions under the Plan. Consistent with the terms of the Backstop Commitment Letter, GenOn paid $45 million in total (5% of the principal amount of the exit financing), or the Backstop Fee, to certain holders of notes issued by GenOn and GenOn Americas Generation, or the Backstop Parties, in exchange for the Backstop Parties’ joint commitment to fully subscribe the exit financing in the event that certain other parties do not fund the full commitments of the exit financing. On October 2, 2017, the GenOn Entities amended the backstop commitment letter to, among other things, remove the requirement to conduct a rights offering.

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The Backstop Fee was considered earned by the Backstop Parties and was paid on June 13, 2017. This payment is effectively a discount (a reduction of the proceeds to be received by GenOn from the noteholders) and is reported in other non-current assets on GenOn’s consolidated balance sheet as of September 30, 2017. When the financing is in effect, it will be reported as a direct reduction from the carrying amount of the debt and amortized over the five-year term as interest expense. The Backstop Fee is reflected as financing costs in the statement of cash flows.

Accounting for Reorganization

As a result of the Chapter 11 Cases, realization of assets and satisfaction of liabilities are subject to a significant number of uncertainties. The consolidated financial statements for GenOn and GenOn Americas Generation were prepared in accordance with Accounting Standards Codification (ASC) 852, Reorganizations, for debtors-in-possession.

Based on the events leading up to the Chapter 11 Cases, including the most recent PJM auction results, the Registrants considered whether it was necessary to impair any of their long-lived assets and concluded that no impairment had occurred as of September 30, 2017. 

Liabilities Subject to Compromise

GenOn's and GenOn Americas Generation's condensed consolidated balance sheets as of September 30, 2017 include amounts classified as liabilities subject to compromise which include prepetition liabilities that were allowed or that are estimated would be allowed as claims in its Chapter 11 proceedings. If there is uncertainty about whether a claim will be impaired under the Plan, the entire amount of the claim is included in liabilities subject to compromise. The following table summarizes the components of liabilities subject to compromise included on the condensed consolidated balance sheets of GenOn and GenOn Americas Generation:

	As of September 30, 2017
	GenOn		GenOn Americas Generation
	(In millions)
Accounts payable and accrued expenses	$	46	$	9
Long-term debt, including current portion	2,616		695
Accrued interest	56		10
Pension and post-retirement liabilities	131		—
Other	13		7
	$	2,862	$	721

Interest Expense

GenOn and GenOn Americas Generation will not pay interest expense during bankruptcy and it is not expected to be an allowable claim. Therefore, GenOn and GenOn Americas Generation did not record interest on the GenOn Senior Notes or the GenOn Americas Generation Senior Notes in the amount of $49 million and $18 million, respectively, for the period from June 14, 2017 through September 30, 2017.

Reorganization Items

Reorganization items represent costs and income directly associated with the Chapter 11 proceedings. The below table represents the significant items in reorganization items for GenOn and GenOn Americas Generation:

	Three months ended September 30, 2017					Nine months ended September 30, 2017
	GenOn			GenOn Americas Generation		GenOn			GenOn Americas Generation
	(In millions)					(In millions)
Legal and other professional advisory fees	$	(29	)	$	—	$	(55	)	$	(1	)
Write-off of debt premiums and credit reserves	—			—		103			43
	$	(29	)	$	—	$	48		$	42

During the nine months ended September 30, 2017, $32 million of cash payments were made by GenOn for reorganization items.

22

Note 4 — Dispositions (GenOn and GenOn Americas Generation)

2017 Dispositions

Sale of Emission Allowances (GenOn and GenOn Americas Generation)

During the first quarter of 2017, GenOn Energy Management, through its existing agreement with NRG Power Marketing, LLC, sold 1.3 million of certain emission credit allowances for proceeds of $18 million resulting in a gain on the sale of approximately $1 million.

2016 Dispositions

Potrero Disposition (GenOn and GenOn Americas Generation)

On September 26, 2016, NRG Potrero LLC, or Potrero, an indirect wholly owned subsidiary of GenOn Americas Generation, completed the sale of real property at the Potrero generating station located in San Francisco, CA to California Barrel Company, LLC for total consideration of $86 million comprised of $74 million of cash received, which is net of $8 million of closing costs and $4 million to be held in escrow in order to cover post-closing obligations. The sale resulted in a gain of approximately $74 million recognized within GenOn Americas Generation's consolidated results of operations during the third quarter of 2016.

Aurora Disposition (GenOn)

On May 12, 2016, GenOn entered into an agreement with RA Generation, LLC to sell the Aurora Generating Station, or Aurora, for cash consideration of $365 million, subject to adjustments for working capital and the results of the PJM 2019/2020 Base Residual Auction. Aurora is an 878 MW natural gas facility located in Aurora, Illinois. On July 12, 2016, GenOn completed the sale of Aurora for cash proceeds of $369 million, including $4 million in adjustments primarily for the PJM base residual auction results and estimated working capital, which is subject to further adjustment. The sale resulted in a gain of approximately $188 million recognized within GenOn's consolidated results of operations during the quarter ended September 30, 2016. In connection with the sale, GenOn issued a guaranty to RA Generation, LLC for the payment of certain indemnified costs related to any damages, losses, or other expenses arising out of misrepresentation or breach of warranties or covenants under the purchase agreement subject to a cap of $365 million, which is reduced to $183 million on January 1, 2018 and then to $91 million beginning January 1, 2019 and will terminate upon the third anniversary of the sale.

Seward Disposition (GenOn)

On November 24, 2015, GenOn entered into an agreement with Seward Generation, LLC and an affiliate of Robindale Energy Services, Inc. to sell the Seward Generating Station, a 525 MW coal-fired facility in Pennsylvania, for cash consideration of $75 million. On February 2, 2016, GenOn completed the sale of Seward and received gross cash proceeds of $75 million excluding $3 million of cash on hand transferred to the buyer. GenOn will also receive $5 million in deferred cash consideration in five$1 million annual installments, of which $1 million has been received as of September 30, 2017, and $2.5 million in payments contingent upon certain environmental requirements being imposed by August 2017, which has been collected in September 2017. In addition, Robindale committed to future inventory purchases from GenOn of $13 million through 2019.

Shelby Disposition (GenOn)

On November 9, 2015, GenOn entered into an agreement with an affiliate of Rockland Power Partners II, LP and Shelby County Energy Center, LLC to sell the Shelby Generating Station, a 352 MW natural gas-fired facility located in Illinois for cash consideration of $46 million. At December 31, 2015, GenOn had classified on its balance sheet the assets and liabilities of Shelby as held for sale. On March 1, 2016, GenOn completed the sale of Shelby for cash proceeds of $46 million which resulted in a gain of $29 million recognized within GenOn's consolidated results of operations during the first quarter of 2016. In addition, GenOn retained $10 million related to future revenue rights as part of the agreement, which has been collected as of September 30, 2017.

23

Note 5 — Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 4, Fair Value of Financial Instruments, to the Registrants' 2016 Form 10-K.

For cash and cash equivalents, restricted cash, funds deposited by counterparties, accounts receivable, accounts payable, accrued liabilities, and cash collateral posted and received in support of energy risk management activities, the carrying amounts approximate fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy.

As a result of the GenOn Entities filing for relief under Chapter 11 as further discussed in Note 3, Chapter 11 Cases, GenOn and GenOn Americas Generation's long-term debt, including current portion, are classified as liabilities subject to compromise as of September 30, 2017.

The estimated carrying amount and fair value of GenOn's long-term debt, including current portion, was $2,752 million and $1,946 million as of December 31, 2016, respectively, of which $1,850 million and $96 million was classified as Level 2 and Level 3, respectively, within the fair value hierarchy. The carrying amount and fair value of long-term debt — affiliate is $125 million as of September 30, 2017 and is classified as Level 3 within the fair value hierarchy.

The estimated carrying amount and fair value of GenOn Americas Generation's long-term debt was $745 million and $570 million as of December 31, 2016, respectively, and is classified as Level 2 within the fair value hierarchy.

The fair value of long-term debt was estimated using reported market prices for instruments that are publicly traded and are classified as Level 2 within the fair value hierarchy. The fair value of non-publicly traded debt and long-term debt — affiliate is based on the income approach valuation technique using current interest rates for similar instruments with equivalent credit quality and is classified as Level 3 within the fair value hierarchy.

Recurring Fair Value Measurements

Derivative assets and liabilities are carried at fair market value. Realized and unrealized gains and losses included in earnings that are related to energy derivatives are recorded in operating revenues and cost of operations.

GenOn

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn’s consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	56	$	—	$	56
Derivative liabilities:
Commodity contracts	$	—	$	36	$	5	$	41
Other assets (b)	$	8	$	—	$	—	$	8

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

(b) Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	122	$	2	$	124
Derivative liabilities:
Commodity contracts	$	—	$	119	$	3	$	122
Other assets (b)	$	10	$	—	$	—	$	10

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

(b) Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees.

24

The following table reconciles, for the three and nine months ended September 30, 2017 and 2016, the beginning and ending balances for derivatives that are recognized at fair value in GenOn's consolidated financial statements at least annually using significant unobservable inputs:

	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	(2	)	$	(11	)	$	(1	)	$	(12	)
Total (losses)/gains included in earnings — realized/unrealized	(1		)	7			(2		)	6
Purchases	(2		)	(1		)	(2		)	1
Transfers out of Level 3 (b)	—			1			—			1
Ending balance	$	(5	)	$	(4	)	$	(5	)	$	(4	)
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	5		$	(3	)	$	(3	)

(a) Consists of derivative assets and liabilities, net.

(b) Transfers out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

GenOn Americas Generation

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn Americas Generation's consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	89	$	5	$	94
Derivative liabilities:
Commodity contracts	$	—	$	88	$	6	$	94

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	209	$	5	$	214
Derivative liabilities:
Commodity contracts	$	—	$	212	$	5	$	217

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

25

The following table reconciles, for the three and nine months ended September 30, 2017 and 2016, the beginning and ending balances for GenOn Americas Generation's derivatives 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)
	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	1		$	—		$	1
Total losses included in earnings — realized/unrealized	(1		)	—			(1		)	(1		)
Purchases	—			(1		)	—			—
Transfers out of Level 3 (b)	—			1			—			1
Ending balance	$	(1	)	$	1		$	(1	)	$	1
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	—		$	(1	)	$	—

(a) Consists of derivative assets and liabilities, net.

(b) Transfers out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

GenOn Mid-Atlantic

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn Mid-Atlantic's consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	12	$	—	$	12
Derivative liabilities:
Commodity contracts	$	—	$	13	$	1	$	14

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	47	$	1	$	48
Derivative liabilities:
Commodity contracts	$	—	$	45	$	1	$	46

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

26

The following table reconciles, for the three and nine months ended September 30, 2017 and 2016, the beginning and ending balances for GenOn Mid-Atlantic's derivatives 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)
	Three months ended September 30,					Nine months ended September 30,
	2017			2016		2017			2016
	Derivatives (a)					Derivatives (a)
	(In millions)
Beginning balance	$	—		$	1	$	—		$	2
Total losses included in earnings — realized/unrealized	(1		)	—		(1		)	(1		)
Ending balance	$	(1	)	$	1	$	(1	)	$	1
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	—	$	(1	)	$	—

(a) Consists of derivative assets and liabilities, net.

Derivative Fair Value Measurements

A portion of the Registrants' contracts are exchange-traded contracts with readily available quoted market prices. A majority of the Registrants' contracts are non-exchange-traded contracts valued using prices provided by external sources, primarily price quotations available through brokers or over-the-counter and on-line exchanges. The remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available for the whole term or for certain delivery months. 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, 2017, contracts valued with prices provided by models and other valuation techniques make up 0% of GenOn's derivative assets and 12% of GenOn's derivative liabilities, 5% of GenOn Americas Generation’s derivative assets and 6% of GenOn Americas Generation's derivative liabilities and 0% of GenOn Mid-Atlantic’s derivative assets and 7% of GenOn Mid-Atlantic's derivative liabilities.

The Registrants' significant positions classified as Level 3 include financial power and physical coal executed in illiquid markets as well as financial transmission rights, or FTRs. The significant unobservable inputs used in developing fair value include illiquid power and coal location pricing, which is derived as a basis to liquid locations. The basis spread is based on observable market data when available or derived from historic prices and forward market prices from similar observable markets when not available. For FTRs, the Registrants use the most recent auction prices to derive the fair value.

27

The following tables quantify the significant unobservable inputs used in developing the fair value of the Registrants' Level 3 positions as of September 30, 2017 and December 31, 2016:

GenOn

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
FTRs	$	—	$	5	Discounted Cash Flow	Auction Prices (per MWh)	$	(3	)	$	1	$	—
	$	—	$	5

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29		$	59	$	43
Coal Contracts	—		1		Discounted Cash Flow	Forward Market Price (per ton)	42			51		45
FTRs	1		2		Discounted Cash Flow	Auction Prices (per MWh)	(2		)	3		—
	$	2	$	3

GenOn Americas Generation

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
FTRs	$	5	$	6	Discounted Cash Flow	Auction Prices (per MWh)	$	(3	)	$	1	$	—
	$	5	$	6

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29		$	59	$	43
Coal Contracts	1		1		Discounted Cash Flow	Forward Market Price (per ton)	42			51		45
FTRs	3		4		Discounted Cash Flow	Auction Prices (per MWh)	(2		)	3		—
	$	5	$	5

28

GenOn Mid-Atlantic

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low		High		Weighted Average
	(In millions)
FTRs	$	—	$	1	Discounted Cash Flow	Auction Prices (per MWh)	$	—	$	1	$	—
	$	—	$	1

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low		High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29	$	59	$	43
FTRs	—		1		Discounted Cash Flow	Auction Prices (per MWh)	—		1		—
	$	1	$	1

The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of September 30, 2017 and December 31, 2016:

Significant Unobservable Input	Position	Change In Input	Impact on Fair Value Measurement
Forward Market Price Power/Coal	Buy	Increase/(Decrease)	Higher/(Lower)
Forward Market Price Power/Coal	Sell	Increase/(Decrease)	Lower/(Higher)
FTR Prices	Buy	Increase/(Decrease)	Higher/(Lower)
FTR Prices	Sell	Increase/(Decrease)	Lower/(Higher)

The fair value of each contract is discounted using a risk free interest rate. In addition, the Registrants apply a non-performance/credit reserve to reflect credit risk which is calculated based on published default probabilities. To the extent that the Registrants' net exposure under a specific master agreement is an asset, the Registrants use the counterparty's 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 Registrants' liabilities or that a market participant would be willing to pay for the Registrants' assets. The Registrants' credit reserves were as follows:

	As of September 30, 2017		As of December 31, 2016
	(In millions)
GenOn	$	—	$	1
GenOn Americas Generation	—		1

There were no non-performance/credit reserves for GenOn Mid-Atlantic as of September 30, 2017 and December 31, 2016.

Under the guidance of ASC 815, entities may choose to offset cash collateral posted or received against the fair value of derivative positions executed with the same counterparties under the same master netting agreements. The Registrants have chosen not to offset positions as defined in ASC 815. As of September 30, 2017, GenOn recorded $72 million of cash collateral posted on its balance sheet related to fair value of derivative positions, which includes $25 million of collateral posted to NRG. As of September 30, 2017, GenOn Americas Generation recorded $70 million of cash collateral posted on its balance sheet related to fair value of derivative positions, which includes $25 million of collateral posted to NRG. As of September 30, 2017, GenOn Mid-Atlantic had no outstanding cash collateral posted or received on its balance sheet.

29

Concentration of Credit Risk

In addition to the credit risk discussion as disclosed in Note 2, Summary of Significant Accounting Policies, to the Registrants' 2016 Form 10-K, the following is a discussion of the concentration of credit risk for the Registrants’ financial instruments. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. The Registrants are exposed to counterparty credit risk through various activities including wholesale sales and fuel purchases.

Counterparty Credit Risk

The Registrants' counterparty credit risk policies are disclosed in their 2016 Form 10-K. As of September 30, 2017, GenOn's counterparty credit exposure was $47 million and GenOn held $0 collateral (cash and letters of credit) against those positions, resulting in a net exposure of $47 million. Approximately 94% of GenOn's exposure before collateral is expected to roll off by the end of 2018. As of September 30, 2017, GenOn Americas Generation’s counterparty credit exposure was $47 million, and GenOn Americas Generation held $0 collateral (cash and letters of credit) against those positions, resulting in a net exposure of $47 million. Approximately 94% of GenOn Americas Generation’s exposure before collateral is expected to roll off by the end of 2018. As of September 30, 2017, GenOn Mid-Atlantic had no counterparty credit exposure. The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for the Registrants with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market, NPNS and non-derivative transactions. The exposure is shown net of collateral held and includes amounts net of receivables or payables.

	Net Exposure (a) (b) (% of Total)
Category by Industry Sector	GenOn		GenOn Americas Generation		GenOn Mid-Atlantic
Utilities, energy merchants, marketers and other	100	%	100	%	—	%
Total as of September 30, 2017	100	%	100	%	—	%

	Net Exposure (a) (b) (% of Total)
Category by Counterparty Credit Quality	GenOn		GenOn Americas Generation		GenOn Mid-Atlantic
Investment grade	96	%	96	%	—	%
Non-Investment grade/Non-rated	4		4		—
Total as of September 30, 2017	100	%	100	%	—	%

(a) Counterparty credit exposure excludes transportation contracts because of the unavailability of market prices.

(b) The figures in the tables above exclude potential counterparty credit exposure related to RTOs, ISOs, registered commodity exchanges and certain long term contracts.

The Registrants have counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of their respective total net exposure discussed above. The aggregate of such counterparties' exposure was $41 million, $41 million and zero for GenOn, GenOn Americas Generation and GenOn Mid-Atlantic, respectively. Changes in hedge positions and market prices will affect credit exposure and counterparty concentration. Given the credit quality, diversification and term of the exposure in the portfolio, the Registrants do not anticipate a material impact on their financial position or results of operations from nonperformance by any of their counterparties.

RTOs and ISOs

The Registrants participate in the organized markets of CAISO, ISO-NE, MISO, NYISO and PJM, known as RTO or ISOs. Trading in these markets is approved by FERC and includes credit policies that, under certain circumstances, require that losses arising from the default of one member on spot market transactions be shared by the remaining participants. As a result, the counterparty credit risk to these markets is limited to the Registrants' applicable share of the overall market and is excluded from the above exposure.

Exchange Traded Transactions

The Registrants enter into commodity transactions on registered exchanges, notably ICE and NYMEX. These clearinghouses act as the counterparty, and transactions are subject to extensive collateral and margining requirements. As a result, these commodity transactions have limited counterparty credit risk.

30

Note 6 — Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 5, Accounting for Derivative Instruments and Hedging Activities, to the Registrants' 2016 Form 10-K.

Energy-Related Commodities(GenOn)

As of September 30, 2017, GenOn had energy-related derivative financial instruments extending through 2019.

Volumetric Underlying Derivative Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

The following table summarizes the net notional volume buy/(sell) of the Registrants’ open derivative transactions broken out by commodity, excluding those derivatives that qualified for the NPNS exception, as of September 30, 2017 and December 31, 2016. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.

		GenOn			GenOn Americas Generation			GenOn Mid-Atlantic
		Total Volume			Total Volume			Total Volume
		As of September 30, 2017		As of December 31, 2016	As of September 30, 2017		As of December 31, 2016	As of September 30, 2017		As of December 31, 2016
Commodity	Units	(In millions)
Coal	Short Ton	2		5	1		4	1		4
Natural Gas	MMBtu	72		138	13		30	13		23
Power	MWh	(12	)	(35)	(3	)	(12)	(3	)	(11)

Fair Value of Derivative Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

The following tables summarize the fair value within the derivative instrument valuation on the balance sheet:

GenOn

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	39	$	108	$	35	$	105
Commodity contracts long-term	17		16		6		17
Total Derivatives Not Designated as Cash Flow Hedges	$	56	$	124	$	41	$	122

GenOn Americas Generation

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	69	$	180	$	71	$	185
Commodity contracts long-term	25		34		23		32
Total Derivatives Not Designated as Cash Flow Hedges	$	94	$	214	$	94	$	217

31

GenOn Mid-Atlantic

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	10	$	44	$	14	$	44
Commodity contracts long-term	2		4		—		2
Total Derivatives Not Designated as Cash Flow Hedges	$	12	$	48	$	14	$	46

The Registrants have elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and do not offset amounts at the counterparty master agreement level. In addition, collateral received or paid on the Registrants' derivative assets or liabilities are recorded on a separate line item on the balance sheet. The following tables summarize the offsetting of derivatives by counterparty master agreement level and collateral received or paid:

GenOn

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets	$	45		$	(15	)	$	—	$	30
Derivative assets - affiliate	11			(11		)	—		—
Derivative liabilities	(28		)	15			2		(11		)
Derivative liabilities - affiliate	(13		)	11			2		—
Total derivative instruments	$	15		$	—		$	4	$	19

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets	$	70		$	(39	)	$	—	$	31
Derivative assets - affiliate	54			(54		)	—		—
Derivative liabilities	(56		)	39			1		(16		)
Derivative liabilities - affiliate	(66		)	54			12		—
Total derivative instruments	$	2		$	—		$	13	$	15

GenOn Americas Generation

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets	$	45		$	(15	)	$	—	$	30
Derivative assets - affiliate	49			(49		)	—		—
Derivative liabilities	(28		)	15			2		(11		)
Derivative liabilities - affiliate	(66		)	49			2		(15		)
Total derivative instruments	$	—		$	—		$	4	$	4

32

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets	$	70		$	(39	)	$	—	$	31
Derivative assets - affiliate	144			(144		)	—		—
Derivative liabilities	(56		)	39			1		(16		)
Derivative liabilities - affiliate	(161		)	144			12		(5		)
Total derivative instruments	$	(3	)	$	—		$	13	$	10

GenOn Mid-Atlantic

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets - affiliate	$	12		$	(12	)	$	—	$	—
Derivative liabilities - affiliate	(14		)	12			—		(2		)
Total derivative instruments	$	(2	)	$	—		$	—	$	(2	)

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets - affiliate	$	48		$	(46	)	$	—	$	2
Derivative liabilities - affiliate	(46		)	46			—		—
Total derivative instruments	$	2		$	—		$	—	$	2

Impact of Derivative Instruments on the Statements of Operations (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Unrealized gains and losses associated with changes in the fair value of derivative instruments are reflected in current period earnings.

During 2016, the Registrants' underwent the process of closing out and financially settling certain open positions with counterparties. The closure and financial settlements with these counterparties were necessary to manage the increases in collateral posting requirements following rating agency downgrades and reduce expected collateral costs associated with exchange cleared hedge transactions.

The following tables summarize the pre-tax effects of economic hedges. These amounts are included within operating revenues and cost of operations.

GenOn

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	9		$	(29	)	$	7	$	(145	)
Net unrealized (losses)/gains on open positions related to economic hedges	(28		)	(68		)	9		(43		)
Total unrealized (losses)/gains	$	(19	)	$	(97	)	$	16	$	(188	)

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	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Revenue from operations — energy commodities	$	(23	)	$	(142	)	$	7	$	(233	)
Cost of operations	4			45			9		45
Total impact to statements of operations	$	(19	)	$	(97	)	$	16	$	(188	)

As discussed above, GenOn realized approximately $38 million due to the closure and financial settlement of all open positions with one of GenOn's counterparties during the second quarter of 2016, for which $18 million, $19 million and $1 million would have otherwise been realized during the remainder of 2016, and in 2017 and 2018, respectively. In addition, GenOn realized $98 million due to the closure and financial settlement of certain open positions with an additional counterparty during the third quarter of 2016, for which $82 million, $13 million and $3 million would have otherwise been realized in 2017, 2018, and 2019, respectively. GenOn had entered into additional transactions with NRG Power Marketing LLC and an external counterparty in order to re-hedge the positions settled with certain counterparties.

During the second quarter of 2017, GenOn realized $5 million due to the closure and financial settlement of all open positions with an additional GenOn counterparty for which $4 million and $1 million would have otherwise been realized during the remainder of 2017 and 2018, respectively. In July 2017, GenOn opened an exchange clearing account with a third party financial institution and posted $20 million of initial collateral.

GenOn Americas Generation

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	11		$	(46	)	$	2	$	(165	)
Net unrealized (losses)/gains on open positions related to economic hedges	(13		)	6			6		(23		)
Total unrealized (losses)/gains	$	(2	)	$	(40	)	$	8	$	(188	)

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Revenue from operations — energy commodities	$	(6	)	$	(75	)	$	(1	)	$	(228	)
Cost of operations	4			35			9			40
Total impact to statements of operations	$	(2	)	$	(40	)	$	8		$	(188	)

As discussed above, GenOn Americas Generation realized approximately $35 million due to the closure and financial settlement of all open positions with one of GenOn Americas Generation's counterparties during the second quarter of 2016, for which $16 million and $19 million would have otherwise been realized during the remainder of 2016 and in 2017, respectively. In addition, GenOn Americas Generation realized $50 million due to the closure and financial settlement of certain open positions with an additional counterparty during the third quarter of 2016, for which $46 million, and $4 million would have otherwise been realized in 2017, and 2018, respectively. GenOn had entered into additional transactions with NRG Power Marketing LLC and an external counterparty in order to re-hedge the positions settled with certain counterparties.

During the second quarter of 2017, GenOn Americas Generation realized $5 million due to the closure and financial settlement of all open positions with an additional GenOn Americas Generation counterparty for which $4 million and $1 million would have otherwise been realized during the remainder of 2017 and 2018, respectively. In July 2017, GenOn opened an exchange clearing account with a third party financial institution and posted $20 million of initial collateral.

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GenOn Mid-Atlantic

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	7		$	(47	)	$	(3	)	$	(146	)
Net unrealized (losses)/gains on open positions related to economic hedges	(12		)	4			1			(18		)
Total unrealized losses	$	(5	)	$	(43	)	$	(2	)	$	(164	)

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Revenue from operations — energy commodities	$	(10	)	$	(83	)	$	(2	)	$	(203	)
Cost of operations	5			40			—			39
Total impact to statements of operations	$	(5	)	$	(43	)	$	(2	)	$	(164	)

As discussed above, GenOn Mid-Atlantic realized approximately $35 million due to the closure and financial settlement of all open positions with one of GenOn Mid-Atlantic's counterparties during the second quarter of 2016, for which $16 million and $19 million would have otherwise been realized during the remainder of 2016 and in 2017, respectively. In addition, GenOn Mid-Atlantic realized $50 million due to the closure and financial settlement of certain open positions with an additional counterparty during the third quarter of 2016, for which $46 million, and $4 million would have otherwise been realized in 2017, and 2018, respectively. GenOn had entered into additional transactions with NRG Power Marketing LLC and an external counterparty in order to re-hedge the positions settled with certain counterparties.

In addition, during the second quarter of 2017 GenOn Mid-Atlantic realized $5 million due to the closure and financial settlement of all open positions with an additional GenOn Mid-Atlantic counterparty for which $4 million and $1 million would have otherwise been realized during the remainder of 2017 and 2018, respectively.

Credit Risk Related Contingent Features (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Certain of GenOn and GenOn Americas Generation’s hedging agreements contain provisions that require the Registrants to post additional collateral if the counterparty determines that there has been deterioration in credit quality, generally termed "adequate assurance" under the agreements, or require the Registrants to post additional collateral if there were a one notch downgrade in the Registrants’ credit rating. The collateral required for contracts that have adequate assurance clauses that are in net liability positions as of September 30, 2017, was $1 million for GenOn and GenOn Americas Generation. As of September 30, 2017, no collateral was required for contracts with credit rating contingent features that are in a net liability position for GenOn and GenOn Americas Generation. GenOn and GenOn Americas Generation are also party to certain marginable agreements under which no collateral was due as of September 30, 2017. As of September 30, 2017, GenOn Mid-Atlantic did not have any financial instruments with credit-risk-related contingent features.

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

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Note 7 — Impairments (GenOn)

2016 Long-Lived Asset Impairments (GenOn)

Mandalay and Ormond Beach (GenOn) — On May 26, 2016, the CPUC rejected a multi-year resource adequacy contract between Mandalay and Southern California Edison. Also occurring during the second quarter of 2016, the Statewide Advisory Committee on Cooling Water Intake Structures, or SACCWIS, issued a draft April 2016 Report noting that CAISO plans to continue to assume in its transmission studies that Ormond Beach will not operate after December 31, 2020, the deadline for Ormond Beach compliance with California regulations to mitigate once-through cooling (OTC) impacts. GenOn does not anticipate that contracts of sufficient value can be secured to support the significant investment required to design, permit, construct and operate measures required for OTC compliance. As a result, on May 6, 2016, GenOn notified SACCWIS that it does not expect to continue to operate Ormond Beach beyond 2020. Additionally, during the second quarter of 2016, CAISO issued its Local Capacity Requirements report for 2017 indicating unfavorable changes within the local reliability areas in which both Mandalay and Ormond Beach are located. The culmination of these events were considered to be indicators of impairment and as a result, GenOn performed impairment tests for the Mandalay and Ormond Beach assets under ASC 360, Property, Plant and Equipment. Based on the results of the impairment tests, GenOn determined that the carrying amount of these assets was higher than the estimated future net cash flows expected to be generated by the respective assets and that the Mandalay and Ormond Beach assets were impaired. The fair value of the Mandalay and Ormond Beach operating units was determined using the income approach which utilizes estimates of discounted future cash flows, which were Level 3 fair value measurements and include key inputs such as forecasted contract prices, forecasted operating expenses and discount rates. GenOn measured the impairment losses as the difference between the carrying amount of the Mandalay and Ormond Beach operating units and the present value of the estimated future net cash flows for each respective operating unit. GenOn recorded an impairment loss of $16 million and $43 million for Mandalay and Ormond Beach, respectively, during the quarter ended June 30, 2016.

Note 8 —Debt and Capital Leases (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

Long-term debt and capital leases consisted of the following:

(In millions, except rates)	September 30, 2017			December 31, 2016		September 30, 2017 interest rate %
GenOn Americas Generation:
GenOn Americas Generation Senior Notes, due 2021	$	366		$	366	8.500
GenOn Americas Generation Senior Notes, due 2031	329			329		9.125
Premiums (a)	—			50
Less: Liabilities subject to compromise	(695		)	—
Subtotal GenOn Americas Generation	—			745
GenOn Energy:
GenOn Senior Notes, due 2017	691			691		7.875
GenOn Senior Notes, due 2018	649			649		9.500
GenOn Senior Notes, due 2020	490			490		9.875
Other liabilities (b)	91			96
GenOn capital lease	2			2
Premiums (a)	—			81
Less: Liabilities subject to compromise	(1,921		)	—
Subtotal GenOn Energy	2			2,009
Subtotal	2			2,754
Less: current maturities	1			704
Total long-term debt and capital leases	$	1		$	2,050

(a)    Premiums were written-off at Petition Date in accordance with ASC 852, Reorganizations.

(b)    Debt financing liabilities associated with the Long Term Service Agreements for the Choctaw and Hunterstown facilities.

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Letter of Credit Facility

As part of the Restructuring Support Agreement, NRG agreed to provide GenOn with a letter of credit facility during the pendency of the Chapter 11 Cases, which could be utilized for required letters of credit in lieu of the Intercompany Revolver. On July 27, 2017, the letter of credit facility was terminated. See Note 10, Related Party Transactions, for further discussion.

On July 14, 2017, the GenOn Entities obtained a letter of credit facility with a third party financial institution to finance the working capital needs and for general corporate purposes. The letter of credit facility provides availability of up to $300 million less amounts borrowed, and letters of credit provided are required to be cash collateralized at 101% of the letter of credit amount. As of September 30, 2017, there was $6 million of letters of credit issued under this letter of credit facility.

GenOn Mid-Atlantic Long-Term Deposits

On January 27, 2017, GenOn Mid-Atlantic entered into an agreement with Natixis Funding Corp., or Natixis, under which Natixis will procure payment and credit support for the payment of certain lease payments owed pursuant to the GenOn Mid-Atlantic operating leases for Morgantown and Dickerson, or the Natixis Agreement. GenOn Mid-Atlantic made a payment of $130 million plus fees of $1 million as consideration for Natixis applying for the issuance of, and obtaining, letters of credit from Natixis, New York Branch, the LC Provider, to support the lease payments. Natixis is solely responsible for (i) obtaining letters of credit from the LC Provider, (ii) causing the letters of credit to be issued to the lessors to support the lease payments on behalf of GenOn Mid-Atlantic, (iii) making lease payments and (iv) satisfying any reimbursement obligations payable to the LC Provider. The payment was accounted for as a long-term deposit on the Registrants' consolidated balance sheets prior to June 30, 2017, reflecting the deferred benefit to GenOn Mid-Atlantic of its contractual rights under the Natixis Agreement, including lease payments Natixis has agreed to make thereunder, and notwithstanding that GenOn Mid-Atlantic had made an irrevocable payment to Natixis.

In letters dated February 24, 2017, GenOn Mid-Atlantic received a series of notices from certain of the owner lessors under its operating leases of the Morgantown coal generation units, or Notices, alleging default. The Notices allege the existence of lease events of default as a result of, among other items, the purported failure by GenOn Mid-Atlantic to comply with a covenant requiring the maintenance of qualifying credit support. The Notices instructed the relevant trustees to draw on letters of credit under the secured intercompany revolving credit agreement between NRG and GenOn as further described in Note 10, Related Party Transactions, to support the GenOn Mid-Atlantic operating leases that were set to expire on February 28, 2017. On February 28, 2017, the trustees drew on the letters of credit under NRG's revolving credit facility, which resulted in borrowings of $125 million. Upon notification, GenOn became obligated under the Intercompany Revolver. In addition, a corresponding payable was recorded by GenOn Mid-Atlantic to GenOn, with the offset recorded as a long-term deposit on the Registrants' consolidated balance sheets as of March 31, 2017 under the related operating leases. GenOn requested GenOn Mid-Atlantic repay the related amount borrowed under the Intercompany Revolver. On May 5, 2017, GenOn Mid-Atlantic repaid $125 million to GenOn.

GenOn Mid-Atlantic disagrees with the owner lessors as to the existence of any lease events of default and/or any breaches by GenOn Mid-Atlantic of any terms and conditions of the operating leases and believes that the declaration of a lease event of default, the instruction to draw on the letters of credit, and the draws thereon constituted a violation by the owner lessors and the relevant trustees of the terms and conditions of the GenOn Mid-Atlantic operating leases. GenOn Mid‑Atlantic has been vigorously pursuing its rights and remedies in connection with these actions. On March 7, 2017, GenOn Mid-Atlantic filed a complaint in the Supreme Court for the State of New York against the owner lessors of the Morgantown and Dickerson facilities and U.S. Bank, N.A., or U.S. Bank, in its capacity as the indenture trustee, the GenOn Mid-Atlantic Complaint. The GenOn Mid-Atlantic Complaint seeks, inter alia, a declaratory judgment that no lease events of default exist and asserts counts for breach of contract, conversion, tortious interference, breach of the implied covenant of good faith and fair dealing, unjust enrichment, constructive trust, and injunctive relief. On June 8, 2017, the owner lessors filed a complaint in the Supreme Court for the State of New York against GenOn Mid‑Atlantic and certain of its affiliates, including GenOn and NRG, the Owner Lessor Complaint. The Owner Lessor Complaint asserts ten counts for various fraudulent transfer, contract, and other claims and seeks hundreds of millions of dollars in damages.

On June 28, 2017, GenOn Mid-Atlantic directed U.S. Bank in its capacity as the indenture trustee, to apply the $125 million that had been drawn on the letters of credit under NRG's revolving credit facility to the June 30 rent obligations related to the operating leases. In addition, GenOn Mid-Atlantic paid $2.7 million to the owner lessors, which, together with the $125 million, would satisfy the June 30 rent obligations. The owner lessors notified U.S. Bank that the $125 million was to be held pending the outcome of the GenOn Mid-Atlantic Complaint, and that GenOn Mid‑Atlantic must instead satisfy its rent obligations solely from available cash. In response, GenOn Mid-Atlantic again directed U.S. Bank to apply the same $125 million to the June 30 rent obligations. On June 30, 2017, U.S. Bank drew on the Natixis Agreement in the amount of $125 million in order to satisfy the remaining June 30 rent obligation. At such time, GenOn Mid-Atlantic transferred $125 million of the amount paid under the Natixis Agreement to prepaid rent - non-current in its consolidated balance sheet. GenOn Mid-Atlantic disputes that the draw on the Natixis Agreement was proper. The owner lessors dispute that the June 30 rent obligations were satisfied, stating that they have only received the $2.7 million.

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On July 6 and 7, 2017, GenOn Mid-Atlantic received notices from certain owner lessors under its operating leases of the Dickerson coal generation units, or the Dickerson Notices. The Dickerson Notices allege the existence of lease events of default as a result of, among other items, the purported failure by GenOn Mid-Atlantic to comply with a covenant requiring the maintenance of qualifying credit support. GenOn Mid-Atlantic disputes that there is a lease event of default related to the Natixis Agreement. On July 31, 2017, and pursuant to an agreement reached between GenOn Mid-Atlantic, the owner lessors and certain holders of pass-through certificates, the proceeds of the draw on the Natixis Agreement were applied by the trustee to the June 30 rent payment and distributed to the holders of the pass through certificates of the Morgantown facility pursuant to the waterfall applicable in a “no default” scenario.

GenOn Mid-Atlantic entered into a limited waiver agreement with U.S. Bank as lease indenture trustee and pass through trustee, the owner lessors, the owner participants and certain consenting certificateholders under the Morgantown operating leases, pursuant to which all such parties agreed to waive the requirement that GenOn Mid-Atlantic reinstate the availability of any drawn qualifying credit support under any lease agreement for the Morgantown coal generation unit. The limited waiver agreement became effective on September 30, 2017 and will remain in effect until the earlier of (i) November 22, 2017 and (ii) 10 business days after a decision or order is issued in the Debtors’ Motion to Estimate the Owner Lessor Plaintiffs’ Claims and Expedited Motion to Establish Related Schedule [Docket No. 128], pending in the Chapter 11 Cases of the GenOn Entities in the United States Bankruptcy Court for the Southern District of Texas, jointly administered under the lead case caption In re GenOn Energy, Inc., Case No. 17-33695 (DRJ).

In connection with the letters of credit issued pursuant to the Natixis Agreement, the LC Provider delivered notices of termination, dated October 26, 2017, of its intent to terminate such letters of credit as of December 27, 2017. Pursuant to the operative documents governing the leases of the Morgantown and Dickerson coal generation units and the letters of credit, the issuer of the letters of credit may terminate such letters of credit by providing 60 days prior written notice to the holders thereof, among other parties. Pursuant to the same operative documents, GenOn Mid-Atlantic must provide alternative qualifying credit support no later than 30 days prior to the intended termination date of the letters of credit subject to termination. GenOn Mid-Atlantic intends to vigorously pursue all rights and claims available to it against any person in connection with the termination of the letters of credit by the LC Provider and the resulting replacement of qualifying credit support.

Note 9 — Income Taxes (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

GenOn

GenOn’s income tax expense consisted of the following:

	Three months ended September 30,						Nine months ended September 30,
(In millions except otherwise noted)	2017			2016			2017			2016
Income before income taxes	$	72		$	284		$	49		$	268
Income tax expense	—			21			7			20
Effective tax rate	—		%	7.4		%	14.3		%	7.5		%

For the three months ended September 30,2017, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance.

For the nine months ended September 30, 2017, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance, partially offset by the impact of state income taxes.

For the three and nine months ended September 30, 2016, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance, offset by the impact of state income taxes associated with the disposition of generating stations during the year.

GenOn Americas Generation

GenOn Americas Generation's allocated income taxes resulting from its operations for the three and nine months ended September 30,2017 and 2016 was zero. GenOn Americas Generation's pro forma income taxes resulting from its operations for the three and nine months ended September 30,2017 and 2016 was zero due to the valuation allowance recorded on its stand-alone financial results.

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GenOn Mid-Atlantic

GenOn Mid-Atlantic’s allocated income taxes resulting from its operations for the three and nine months ended September 30,2017 and 2016 was zero. GenOn Mid-Atlantic’s pro forma income taxes resulting from its operations was zero and a tax expense of $23 million during the three months ended September 30, 2017 and 2016, respectively. The pro forma income tax provision attributable to income before taxes was zero and a tax expense of $25 million during the nine months ended September 30, 2017 and 2016, respectively.

Note 10 — Related Party Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Services Agreement with NRG

NRG provides GenOn with various management, personnel and other services, which include human resources, regulatory and public affairs, accounting, tax, legal, information systems, treasury, risk management, commercial operations, and asset management, as set forth in the services agreement with NRG, or the Services Agreement. The initial term of the Services Agreement was through December 31, 2013, with an automatic renewal absent a request for termination. The fee charged was determined based on a fixed amount as described in the Services Agreement and was calculated based on historical GenOn expenses prior to the NRG Merger. The annual fees under the Services Agreement were approximately $193 million. As described in Note 3, Chapter 11 Cases, in connection with the Restructuring Support Agreement, NRG agreed to provide shared services to GenOn under the Services Agreement for an adjusted annualized fee of $84 million through the pendency of the Chapter 11 Cases. Subsequent to the GenOn Entities’ emergence from bankruptcy, NRG will provide shared services for two months at no charge; after which GenOn has an additional two, one-month options to provide services at the annualized fee of $84 million. NRG charges these fees on a monthly basis, less amounts incurred directly by GenOn. For the three and nine months ended September 30, 2017, GenOn recorded costs related to these services of $14 million and $100 million, respectively, as general and administrative — affiliate. For the three and nine months ended September 30, 2016, GenOn recorded costs related to these services of $46 million and $139 million, respectively, as general and administrative — affiliate.

In addition, under the Restructuring Support Agreement, NRG has agreed to provide GenOn with a $28 million credit against amounts owed to NRG prior to the Petition Date under the current Services Agreement. As of June 30, 2017, GenOn recorded a receivable from NRG for this $28 million. Such amount was intended to reimburse GenOn for costs incurred in connection with the 2022 Notes that were not assumed. Accordingly, GenOn removed the previously deferred costs in the amount of $28 million and recorded a receivable from NRG for this amount. The receivable is reflected net in accounts payable - affiliate on the consolidated balance sheet as of September 30, 2017. In addition, the Restructuring Support Agreement provides that to the extent GenOn has paid for services during the bankruptcy proceedings and the aforementioned credit has not been applied in full, NRG shall, upon request by GenOn, reimburse such payments in cash up to the amount of any unused portion of the credit.

Under the Services Agreement, NRG also provides GenOn Americas Generation and GenOn Mid-Atlantic with various management, personnel and other services consistent with those set forth in the Services Agreement discussed above between NRG and GenOn. GenOn's costs incurred under the Services Agreement with NRG are allocated to its subsidiaries based on each operating subsidiary's planned operating expenses relative to all operating subsidiaries of GenOn. These allocations and charges are not necessarily indicative of what would have been incurred had GenOn Americas Generation and GenOn Mid-Atlantic been unaffiliated entities. Management has concluded that this method of charging overhead costs is reasonable.

The following costs were incurred under these arrangements:

GenOn Americas Generation

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017			2016
	(In millions)
Allocated costs:
Cost of operations — affiliate	$	—	$	—	$	(1	)	$	2
General and administrative — affiliate	9		21		53			62
Total	$	9	$	21	$	52		$	64

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GenOn Mid-Atlantic

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017		2016
	(In millions)
Allocated costs:
Cost of operations — affiliate	$	1	$	1	$	2	$	2
General and administrative — affiliate	4		15		42		45
Total	$	5	$	16	$	44	$	47

Credit Agreement with NRG (GenOn)

GenOn and NRG Americas, Inc. are party to a secured intercompany revolving credit agreement with NRG, or the Intercompany Revolver.  The Intercompany Revolver provided for a $500 million revolving credit facility, all of which was available for revolving loans and letters of credit. At September 30, 2017 and December 31, 2016, $103 million and $272 million, respectively, of letters of credit were issued and outstanding under the NRG credit agreement for GenOn. Of this amount, $21 million and $199 million were issued on behalf of GenOn Americas Generation as of September 30, 2017 and December 31, 2016, respectively, which includes $1 million and $128 million issued on behalf of GenOn Mid-Atlantic as of September 30, 2017 and December 31, 2016, respectively. Additionally, as of September 30, 2017, there were $125 million loans outstanding under the Intercompany Revolver, which is recorded as long-term debt - affiliate on the balance sheet, as further described in Note 8, Debt and Capital Leases. As of December 31, 2016, no loans were outstanding under this Intercompany Revolver.  Certain of GenOn's subsidiaries, as guarantors, entered into a guarantee agreement pursuant to which these guarantors guaranteed amounts borrowed and obligations incurred under the credit agreement. The guarantors are restricted from incurring additional liens on certain of their assets. In addition, the Intercompany Revolver contains customary covenants and events of default. As of September 30, 2017, GenOn was in default under the Intercompany Revolver with NRG due to the filing of the Chapter 11 Cases.

As a result of the Chapter 11 Cases, no additional revolving loans or letters of credit are available to GenOn under the Intercompany Revolver. In addition, NRG agreed to provide GenOn with a letter of credit facility during the pendency of the Chapter 11 Cases, which could be utilized for required letters of credit in lieu of the Intercompany Revolver. The letter of credit facility provided availability of up to $330 million less amounts borrowed and letters of credit provided were required to be cash collateralized at 103% of the letter of credit amount. On July 27, 2017, this letter of credit facility was terminated as GenOn has obtained a separate letter of credit facility with a third party financial institution, as discussed in Note 8, Debt and Capital Leases. Effective with completion of the reorganization, GenOn must repay NRG for all revolving loans outstanding, with such amount to be netted against the settlement payment owed from NRG to GenOn. Interest continues to accrue during the pendency of the Chapter 11 Cases and borrowings remain secured obligations.

Intercompany Cash Management Program (GenOn Americas Generation)

GenOn Americas Generation and certain of its subsidiaries participate in separate intercompany cash management programs whereby cash balances at GenOn Americas Generation and the respective participating subsidiaries are transferred to central concentration accounts to fund working capital and other needs of the respective participants. The balances under this program are reflected as notes receivable — affiliate and accounts receivable — affiliate or notes payable — affiliate and accounts payable — affiliate, as appropriate. The balances are due on demand and notes receivable — affiliate andnotes payable — affiliateaccrue interest on the net position, which is payable quarterly, at a rate determined by GenOn Energy Holdings, a wholly owned subsidiary of GenOn. These arrangements have continued in the normal course of business through the pendency of the Chapter 11 Cases. At September 30, 2017 and December 31, 2016, GenOn Americas Generation had a net current note receivable — affiliate from GenOn Energy Holdings of $318 million and $315 million, respectively, related to its intercompany cash management program. For the nine months endedSeptember 30, 2017 and 2016, GenOn Americas Generation earned an insignificant amount of net interest income related to these notes. Additionally, at September 30, 2017 and December 31, 2016, GenOn Americas Generation had an accounts receivable — affiliate of $50 million and an accounts payable — affiliate of $43 million, respectively, with GenOn Energy Holdings related to the intercompany cash management programs.

Intercompany Hedging Agreements with NRG

Under intercompany agreements, NRG Power Marketing LLC may from time to time enter into physical and financial intercompany commodity and hedging transactions with GenOn and certain of its subsidiaries. Subject to applicable collateral thresholds, these arrangements may provide for the bilateral exchange of credit support based upon market exposure and potential market movements. The terms and conditions of the agreements are generally consistent with industry practices and other third party arrangements. As of September 30, 2017, GenOn has no net exposure under these arrangements.

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Note 11 — Commitments and Contingencies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 14, Commitment and Contingencies, to the Registrants' 2016 Form 10-K.

Contingencies

The Registrants’ material legal proceedings are described below. The Registrants believe that they have valid defenses to these legal proceedings and intend to defend them vigorously. The Registrants record reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. As applicable, the Registrants believe they have established an adequate reserve for the matters discussed below. In addition, legal costs are expensed as incurred. Management has assessed each of the following matters based on current information and made a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. Unless specified below, the Registrants are unable to predict the outcome of these legal proceedings or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Registrants’ liabilities and contingencies could be at amounts that are different from their currently recorded reserves and that such difference could be material.

In addition to the legal proceedings noted below, the Registrants are parties to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect the Registrants’ respective consolidated financial position, results of operations, or cash flows.

GenOn Chapter 11 Cases (GenOn and GenOn Americas Generation) — On the Petition Date, the GenOn Entities filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code in the Bankruptcy Court. As a result of such bankruptcy filings, substantially all proceedings pending against the GenOn Entities have been stayed by operation of Section 362(a) of the Bankruptcy Code. Under the Restructuring Support Agreement to which the GenOn Entities, NRG and certain of GenOn's and GenOn Americas Generation's senior unsecured noteholders are parties, each of them has agreed to support Bankruptcy Court approval of the Plan. GenOn has a customary "fiduciary out" under the Restructuring Support Agreement. Moreover, the Bankruptcy Court may not approve the Plan. If the Plan is not approved and consummated, GenOn may not be entitled to the benefits of the Settlement Agreement provided under the Restructuring Support Agreement and it will remain subject to any claims of NRG and the noteholders, including claims relating to or arising out of any shared services and any other relationships or transactions between the companies. See Note 3, Chapter 11 Cases, for additional information. The GenOn Entities are in the process of evaluating claims submitted in connection with the Chapter 11 Cases to determine the validity of such claims but has not yet finished their assessment of valid claims and are currently unable to determine the amount of such claims.

Actions Pursued by MC Asset Recovery (GenOn) — With Mirant Corporation's emergence from bankruptcy protection in 2006, certain actions filed by GenOn Energy Holdings and some of its subsidiaries against third parties were transferred to MC Asset Recovery, a wholly owned subsidiary of GenOn Energy Holdings.  MC Asset Recovery is governed by a manager who is independent of NRG and GenOn.  MC Asset Recovery is a disregarded entity for income tax purposes. Under the remaining action transferred to MC Asset Recovery, MC Asset Recovery seeks to recover damages from Commerzbank AG and various other banks, or the Commerzbank Defendants, for alleged fraudulent transfers that occurred prior to Mirant's bankruptcy proceedings.  In December 2010, the U.S. District Court for the Northern District of Texas dismissed MC Asset Recovery's complaint against the Commerzbank Defendants.  In January 2011, MC Asset Recovery appealed the District Court's dismissal of its complaint against the Commerzbank Defendants to the U.S. Court of Appeals for the Fifth Circuit, or the Fifth Circuit.  In March 2012, the Fifth Circuit reversed the District Court's dismissal and reinstated MC Asset Recovery's amended complaint against the Commerzbank Defendants. On December 10, 2015, the District Court granted summary judgment in favor of the Commerzbank Defendants. On December 29, 2015, MC Asset Recovery filed a notice to appeal this judgment with the Fifth Circuit. On June 1, 2017, the Fifth Circuit affirmed the District Court's judgment. On June 12, 2017, MC Asset Recovery petitioned the Fifth Circuit for rehearing. The petition for rehearing was denied and a court order and judgment affirming the District Court's judgments was entered on July 17, 2017. On January 17, 2018, the bankruptcy court will hear a Motion for a Final Decree in the Mirant bankruptcy.

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Natural Gas Litigation (GenOn)— GenOn is party to several lawsuits, certain of which are class action lawsuits, in state and federal courts in Kansas, Missouri, Nevada and Wisconsin. These lawsuits were filed in the aftermath of the California energy crisis in 2000 and 2001 and the resulting FERC investigations and relate to alleged conduct to increase natural gas prices in violation of state antitrust law and similar laws. The lawsuits seek treble or punitive damages, restitution and/or expenses. The lawsuits also name as parties a number of energy companies unaffiliated with NRG. In July 2011, the U.S. District Court for the District of Nevada, which was handling four of the five cases, granted the defendants' motion for summary judgment and dismissed all claims against GenOn in those cases. The plaintiffs appealed to the U.S. Court of Appeals for the Ninth Circuit, or the Ninth Circuit, which reversed the decision of the District Court. GenOn along with the other defendants in the lawsuit filed a petition for a writ of certiorari to the U.S. Supreme Court challenging the Ninth Circuit's decision and the U.S. Supreme Court granted the petition. On April 21, 2015, the U.S. Supreme Court affirmed the Ninth Circuit’s holding that plaintiffs’ state antitrust law claims are not field-preempted by the federal Natural Gas Act and the Supremacy Clause of the U.S. Constitution. The U.S. Supreme Court left open whether the claims were preempted on the basis of conflict preemption. The U.S. Supreme Court directed that the case be remanded to the U.S. District Court for the District of Nevada for further proceedings. On March 7, 2016, class plaintiffs filed their motions for class certification. Defendants filed their briefs in opposition to class plaintiffs' motions for class certification on June 24, 2016. On March 30, 2017, the court denied the plaintiffs' motions for class certification. On April 13, 2017, the plaintiffs petitioned the Ninth Circuit for interlocutory review of the court’s order denying class certification. On June 13, 2017, the Ninth Circuit granted plaintiffs' petition for interlocutory review.

In May 2016 in one of the Kansas cases, the U.S. District Court for the District of Nevada granted the defendants' motion for summary judgment. Subsequently in December 2016, the plaintiffs filed a notice of appeal with the Ninth Circuit. The appeal has been fully briefed by the parties. GenOn has agreed to indemnify CenterPoint against certain losses relating to these lawsuits.

In September 2012, the State of Nevada Supreme Court, which was handling the remaining case, affirmed dismissal by the Eighth Judicial District Court for Clark County, Nevada of all plaintiffs' claims against GenOn. In February 2013, the plaintiffs in the Nevada case filed a petition for a writ of certiorari to the U.S. Supreme Court. In June 2013, the U.S. Supreme Court denied the petition for a writ of certiorari, thereby ending one of the five lawsuits.

Mirant Chapter 11 Proceedings (GenOn and GenOn Americas Generation)— In July 2003, and various dates thereafter, the Mirant Debtors filed voluntary petitions in the U.S. Bankruptcy Court for the Northern District of Texas, Fort Worth Division, for relief under Chapter 11 of the Bankruptcy Code. GenOn Energy Holdings and most of the other Mirant Debtors emerged from bankruptcy on January 3, 2006, when the plan of reorganization that was approved in conjunction with Mirant Corporation's emergence from bankruptcy protection, or the Mirant Plan, became effective. The remaining Mirant Debtors emerged from bankruptcy on various dates in 2007. Approximately 461,000 of the shares of GenOn Energy Holdings common stock to be distributed under the Mirant Plan have not yet been distributed and have been reserved for distribution with respect to claims disputed by the Mirant Debtors that have not been resolved. Upon the Mirant/RRI Merger, those reserved shares converted into a reserve for approximately 1.3 million shares of GenOn common stock. Upon the NRG Merger, those reserved shares converted into a reserve for approximately 159,000 shares of NRG common stock. Under the terms of the Mirant Plan, upon the resolution of such a disputed claim, the claimant will receive the same pro rata distributions of common stock, cash, or both as previously allowed claims, regardless of the price at which the common stock is trading at the time the claim is resolved. If the aggregate amount of any such payouts results in the number of reserved shares being insufficient, additional shares of common stock may be issued to address the shortfall. On January 17, 2018, the bankruptcy court will hear a Motion for a Final Decree in the Mirant Bankruptcy.

Potomac River Environmental Investigation (GenOn Mid-Atlantic) — In March 2013, NRG Potomac River LLC, a subsidiary of GenOn Mid-Atlantic, received notice that the District of Columbia Department of Environment (now renamed the Department of Energy and Environment, or DOEE) was investigating potential discharges to the Potomac River originating from the Potomac River Generating facility site, a site where the generation facility is no longer in operation. In connection with that investigation, DOEE served a civil subpoena on NRG Potomac River LLC requesting information related to the site and potential discharges occurring from the site.  NRG Potomac River LLC provided various responsive materials.  In January 2016, DOEE advised NRG Potomac River LLC that DOEE believed various environmental violations had occurred as a result of discharges DOEE believes occurred to the Potomac River from the Potomac River Generating facility site and as a result of associated failures to accurately or sufficiently report such discharges.  DOEE has indicated it believes that penalties are appropriate in light of the violations.  NRG Potomac River LLC is currently reviewing the information provided by DOEE.

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GenOn Noteholders' Lawsuit (GenOn and GenOn Americas Generation) —On December 13, 2016, certain indenture trustees for an ad hoc group of holders, or the Noteholders, of the GenOn Energy, Inc. 7.875% Senior Notes due 2017, 9.500% Notes due 2018, and 9.875% Notes due 2020, and the GenOn Americas Generation, LLC 8.50% Senior Notes due 2021 and 9.125% Senior Notes due 2031, along with certain of the Noteholders, filed a complaint in the Superior Court of the State of Delaware against NRG and GenOn alleging certain claims related to a services agreement between NRG and GenOn. Plaintiffs generally seek recovery of all monies paid under the services agreement and any other damages that the court deems appropriate. On February 3, 2017, the court entered an order approving a Standstill Agreement whereby the parties agreed to suspend all deadlines in the case until March 1, 2017. The Standstill Agreement terminated on March 1, 2017. On April 30, 2017, the Noteholders filed an amended complaint that asserts (i) additional fraudulent transfer claims in relation to GenOn’s sale of the Marsh Landing project to NRG Yield LLC, (ii) alleged breaches of fiduciary duty by certain current and former officers and directors of GenOn in relation to the management services agreement and the alleged usurpation of corporate opportunities concerning the Mandalay and Canal projects and (iii) claims against NRG for allegedly aiding and abetting such claimed breaches of fiduciary duties. In addition to NRG and GenOn, the amended complaint names NRG Yield LLC and certain current and former officers and directors of GenOn as defendants. The plaintiffs generally seek recovery of all monies paid under the services agreement and any other damages that the court deems appropriate. On March 31, 2017, NRG and GenOn filed separate motions to dismiss the complaint, but such motions are superseded by the amended complaint. Pursuant to the terms of the Restructuring Support Agreement, this matter should ultimately be resolved if the GenOn Entities' plan of reorganization is approved by the Bankruptcy Court.

Rice v. NRG — On April 14, 2017, plaintiffs filed a purported class action lawsuit in the U.S. District Court for the Western District of Pennsylvania against NRG, First Energy Corporation and Matt Canastrale Contracting, Inc.  Plaintiffs generally claim personal injury, trespass, nuisance and property damage related to the disposal of coal ash from GenOn's Elrama Power Plant and First Energy’s Mitchell and Hatfield Power Plants. Plaintiffs generally seek monetary damages, medical monitoring and remediation of their property. Plaintiffs filed an amended complaint on August 14, 2017.

Morgantown v. GenOn Mid-Atlantic — On June 8, 2017, Morgantown and Dickerson Owner Lessors filed a lawsuit against GenOn Mid-Atlantic, LLC, NRG North America LLC, GenOn Americas Generation, LLC, NRG Americas, Inc., GenOn Energy Holdings, Inc., GenOn Energy, Inc., and NRG Energy, Inc. in New York State Supreme Court. The plaintiffs allege that they were overcharged by defendants for certain services outlined in a Services Agreement and that defendants caused a Qualified Credit Support portion of a Participation Agreement, or QCS Agreement, to be violated by causing the transfer of certain monies outside the allowable confines set forth in the QCS Agreement. In addition, plaintiffs claim that the transfers were unfairly executed and done so in an effort to defraud plaintiffs and hinder their ability to continue to do business. As such, plaintiffs seek, among other things, the return of certain transferred funds and service charges paid and to bar defendants from executing additional transfers on plaintiffs’ behalf. A claims estimation ruling on this matter by the Bankruptcy Court could occur as early as November 7, 2017.

Note 12 — Regulatory Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 15, Regulatory Matters, to the Registrants' 2016 Form 10-K.

The Registrants operate in a highly regulated industry and are subject to regulation by various federal and state agencies. As such, the Registrants are affected by regulatory developments at both the federal and state levels and in the regions in which they operate. In addition, the Registrants are subject to the market rules, procedures, and protocols of the various ISO and RTO markets in which they participate. These power markets are subject to ongoing legislative and regulatory changes that may impact the Registrants' wholesale business.

In addition to the regulatory proceedings noted below, the Registrants are parties to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect the Registrants’ respective consolidated financial position, results of operations, or cash flows.

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National

Zero-Emission Credits for Nuclear Plants in Illinois — In 2016, Illinois enacted a Zero Emission Credit, or ZEC, program for selected nuclear units in Illinois. In total, the program directs over $2.5 billion over ten years to nuclear plants in Illinois that would otherwise retire. Pursuant to the legislation, the Illinois Power Agency, or IPA, conducts a competitive solicitation to procure ZECs, although both the Governor of Illinois and Exelon have already announced that the ZECs will be awarded to two Exelon-owned nuclear power plants in Illinois.  These ZECs are out-of-market subsidies that threaten to artificially suppress market prices and interfere with the wholesale power market. On February 14, 2017, NRG, along with other companies, filed a complaint in the U.S. District Court for the Northern District of Illinois alleging that the state program is preempted by federal law and in violation of the dormant commerce clause. Another plaintiff group filed a similar complaint on the same day.Subsequently, on March 31, 2017, NRG, along with other companies, filed a motion for preliminary injunction. On April 10, 2017, Exelon, as an intervenor defendant, and State defendants filed motions to dismiss. On July 14, 2017, Defendants' motions to dismiss were granted. On July 17, 2017, NRG, along with other companies, filed a notice of appeal to the U.S. Court of Appeals for the Seventh Circuit. On July 18, 2017, the Court of Appeals issued an order setting an expedited briefing schedule for the matter. Briefing is underway.

Zero-Emission Credits for Nuclear Plants in New York — On August 1, 2016, the NYSPSC issued its Clean Energy Standard, or CES, which provided for ZECs which would provide more than $7.6 billion over 12 years in out-of-market subsidy payments to certain selected nuclear generating units in the state. These ZECs are out-of-market subsidies that threaten to artificially suppress market prices and interfere with the wholesale power market. On October 19, 2016, NRG, along with other companies, filed a complaint in the U.S. District Court for the Southern District of New York, challenging the validity of the NYSPSC action and the ZEC program. On March 29, 2017, the U.S. District Court heard oral arguments on a motion to dismiss filed by defendants. On July 25, 2017, the defendants' motions to dismiss were granted. On August 24, 2017, NRG, along with other companies, filed a notice of appeal to the U.S. Court of Appeals for the Second Circuit. On September 9, 2017, the Court of Appeals issued a briefing schedule. Briefing is underway.

Note 13 — Environmental Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 16, Environmental Matters, to the Registrants' 2016 Form 10-K.

The Registrants are subject to a wide range of environmental laws in the development, construction, ownership and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and during operation of power plants. The electric generation industry has been facing requirements regarding GHGs, combustion byproducts, water discharge and use, and threatened and endangered species that have been put in place in recent years. However, under the current U.S. presidential administration some of these rules are being reconsidered and reviewed. In general, future laws are expected to require the addition of emissions controls or other environmental controls or to impose certain restrictions on the operations of the Registrants' facilities, which could have a material effect on the Registrants' respective consolidated financial position, results of operations, or cash flows. Federal and state environmental laws generally have become more stringent over time, although this trend could slow or pause in the near term with respect to federal laws under the current U.S. presidential administration.

The EPA finalized CSAPR in 2011, which was intended to replace CAIR in January 2012, to address certain states' obligations to reduce emissions so that downwind states can achieve federal air quality standards. In December 2011, the D.C. Circuit stayed the implementation of CSAPR and then vacated CSAPR in August 2012 but kept CAIR in place until the EPA could replace it. In April 2014, the U.S. Supreme Court reversed and remanded the D.C. Circuit's decision. In October 2014, the D.C. Circuit lifted the stay of CSAPR. In response, the EPA in November 2014 amended the CSAPR compliance dates. Accordingly, CSAPR replaced CAIR on January 1, 2015. On July 28, 2015, the D.C. Circuit held that the EPA had exceeded its authority by requiring certain reductions that were not necessary for downwind states to achieve federal standards. Although the D.C. Circuit kept the rule in place, the court ordered the EPA to revise the Phase 2 (or 2017) (i) SO₂ budgets for four states and (ii) ozone-season NO_x budgets for 11 states including Maryland, New Jersey, New York, Ohio and Pennsylvania. On October 26, 2016, the EPA finalized the CSAPR Update Rule, which reduces future NOx allocations and discounts the current banked allowances to account for the more stringent 2008 Ozone NAAQS and to address the D.C. Circuit's July 2015 decision. This rule has been challenged in the D.C. Circuit. The Registrants believe their investment in pollution controls and cleaner technologies leave the fleet well-positioned for compliance.

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In February 2012, the EPA promulgated standards (the MATS rule) to control emissions of HAPs from coal and oil-fired electric generating units. The rule established limits for mercury, non-mercury metals, certain organics and acid gases, which had to be met beginning in April 2015 (with some units getting a 1-year extension). In June 2015, the U.S. Supreme Court issued a decision in the case of Michigan v. EPA, and held that the EPA unreasonably refused to consider costs when it determined that it was "appropriate and necessary" to regulate HAPs emitted by electric generating units. The U.S. Supreme Court did not vacate the MATS rule but rather remanded it to the D.C. Circuit for further proceedings. In December 2015, the D.C. Circuit remanded the MATS rule to the EPA without vacatur. On April 25, 2016, the EPA released a supplemental finding that the benefits of this regulation outweigh the costs to address the U.S. Supreme Court's ruling that the EPA had not properly considered costs. This finding has been challenged in the D.C. Circuit. On April 18, 2017, the EPA asked the D.C. Circuit to postpone oral argument that had been scheduled for May 18, 2017 because the EPA is closely reviewing the supplemental finding to determine whether it should reconsider all or part of the rule. On April 27, 2017, the D.C. Circuit granted EPA’s request to postpone the oral argument and hold the case in abeyance. While the Registrants cannot predict the final outcome of this rulemaking, the Registrants believe that because they have already invested in pollution controls and cleaner technologies, their fleet is well-positioned to comply with the MATS rule.

Water

In August 2014,the EPA finalized the regulation regarding the use of water for once through cooling at existing facilities to address impingement and entrainment concerns. The Registrants anticipate that more stringent requirements will be incorporated into some of their water discharge permits over the next several years as NPDES permits are renewed.

Effluent Limitations Guidelines — In November 2015, the EPA revised the Effluent Limitations Guidelines for Steam Electric Generating Facilities, which would have imposed more stringent requirements (as individual permits were renewed) for wastewater streams from flue gas desulfurization, or FGD, fly ash, bottom ash, and flue gas mercury control.  In April 2017, the EPA granted two petitions to reconsider the rule and also administratively stayed some of the deadlines. On September 18, 2017, the EPA promulgated a final rule that (i) postpones the compliance dates to preserve the status quo for FGD wastewater and bottom ash transport water by two years to November 2020 until the EPA completes its next rulemaking and (ii) withdrew the April 2017 administrative stay.  The legal challenges have been suspended while the EPA reconsiders and likely modifies the rule. Accordingly, the Registrants have largely eliminated their estimate of the environmental capital expenditures that would have been required to comply with permits incorporating the revised guidelines. The Registrants will revisit these estimates after the rule is revised.  

Byproducts, Wastes, Hazardous Materials and Contamination

In April 2015, the EPA finalized the rule regulating byproducts of coal combustion (e.g., ash and gypsum) as solid wastes under the RCRA. On September 13, 2017, the EPA granted a petition for reconsideration that the Utility Solid Waste Activities Group filed in May 2017. The Registrants have evaluated the impact of the new rule on their results of operations, financial condition and cash flows and have accrued their environmental and asset retirement obligations under the rule based on current estimates as of September 30, 2017.

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Note 14 — Debtors' Financial Information (GenOn and GenOn Americas Generation)

The financial information below represents the Debtor Entities condensed combined financial statements for the three months ended September 30, 2017 and the period from June 14, 2017 through September 30, 2017. The following represent the entities included in the GenOn Entities, or the GenOn Energy, Inc. Debtors:

GenOn Americas Generation, LLC1	NRG Lovett LLC1
GenOn Americas Procurement, Inc.	NRG New York LLC1
GenOn Asset Management, LLC	NRG North America LLC1
GenOn Capital Inc.	NRG Northeast Generation, Inc.
GenOn Energy Holdings, Inc.	NRG Northeast Holdings, Inc.
GenOn Energy Management, LLC1	NRG Potrero LLC1
GenOn Energy Services, LLC	NRG Power Generation Assets LLC
GenOn Energy, Inc.	NRG Power Generation LLC
GenOn Fund 2001 LLC	NRG Power Midwest GP LLC
GenOn Mid-Atlantic Development, LLC	NRG Power Midwest LP
GenOn Power Operating Services MidWest, Inc.	NRG Sabine (Delaware), Inc.
GenOn Special Procurement, Inc.1	NRG Sabine (Texas), Inc.
Hudson Valley Gas Corporation1	NRG San Gabriel Power Generation LLC
Mirant Asia-Pacific Ventures, LLC	NRG Tank Farm LLC
Mirant Intellectual Asset Management and Marketing, LLC	NRG Wholesale Generation GP LLC
Mirant International Investments, Inc.	NRG Wholesale Generation LP
Mirant New York Services, LLC	NRG Willow Pass LLC
Mirant Power Purchase, LLC	Orion Power New York GP, Inc.
Mirant Wrightsville Investments, Inc.	Orion Power New York LP, LLC
Mirant Wrightsville Management, Inc.	Orion Power New York, L.P.
MNA Finance Corp.1	RRI Energy Broadband, Inc.
NRG Americas, Inc.	RRI Energy Channelview (Delaware) LLC
NRG Bowline LLC1	RRI Energy Channelview (Texas) LLC
NRG California North LLC1	RRI Energy Channelview LP
NRG California South GP LLC	RRI Energy Communications, Inc.
NRG California South LP	RRI Energy Services Channelview LLC
NRG Canal LLC1	RRI Energy Services Desert Basin, LLC
NRG Delta LLC1	RRI Energy Services, LLC
NRG Florida GP, LLC	RRI Energy Solutions East, LLC
NRG Florida LP	RRI Energy Trading Exchange, Inc.
NRG Lovett Development I LLC1	RRI Energy Ventures, Inc.

¹ Represent the GenOn Americas Generation debtor entities, or the GenOn Americas Generation Debtors.

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Supplemental Condensed Combined Statement of Operations
(Unaudited)
	Three months ended September 30, 2017						Period from June 14, 2017 through September 30, 2017
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors			GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)						(In millions)
Total operating revenues	$	500		$	446		$	594		$	511
Total operating costs and expenses	396			408			462			471
Operating Income	104			38			132			40
Other Expense
Total other expense	(3		)	(5		)	(4		)	(6		)
Income Before Reorganization Items and Income Taxes	101			33			128			34
Reorganization items, net	(29		)	—			74			43
Income Before Income Taxes	72			33			202			77
Income tax expense	—			—			—			—
Net Income	$	72		$	33		$	202		$	77

The condensed combined comprehensive income for GenOn Energy, Inc. Debtors and the GenOn Americas Generation Debtors is equal to the condensed combined net income for the three months ended September 30, 2017 and the period from June 14, 2017 through September 30, 2017.

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Supplemental Condensed Combined Balance Sheet
As of September 30, 2017
(Unaudited)
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)
ASSETS
Cash and cash equivalents	$	568		$	—
Restricted cash	1			—
Accounts receivable	117			110
Accounts receivable — affiliate	658			—
Notes receivable — affiliate	—			318
Prepaid rent and other current assets	898			274
Total current assets	2,242			702
Property, plant and equipment, net	1,235			155
Investment in subsidiaries	(269		)	1,117
Notes receivable — affiliate	544			—
Other non-current assets	144			68
Total Assets	$	3,896		$	2,042
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	$	42		$	20
Accounts payable — affiliate	—			26
Accrued expenses and other current liabilities	134			93
Total current liabilities	176			139
Liabilities subject to compromise	2,862			721
Long-term debt — affiliate	125			—
Other non-current liabilities	338			81
Total Liabilities	3,501			941
Stockholder's equity	395			1,101
Total Liabilities and Stockholder's Equity	$	3,896		$	2,042

Supplemental Condensed Combined Statement of Cash Flows
Period from June 14, 2017 through September 30, 2017
(Unaudited)
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)
Net cash provided by operating activities	$	97		$	4
Net cash used by investing activities	(9		)	(4		)
Net cash used by financing activities	(3		)	—
Net increase in cash, cash equivalents and restricted cash	85			—
Cash, cash equivalents and restricted cash at beginning of period	484			—
Cash, cash equivalents and restricted cash at end of period	$	569		$	—

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Item 2 — MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

As you read this discussion and analysis, refer to the Registrants' Condensed Consolidated Financial Statements to this Form 10-Q, which present the results of operations for the three and nine months ended September 30, 2017 and 2016. Also, refer to the Registrants' 2016 Form 10-K, which includes detailed discussions of various items impacting the Registrants' business, results of operations and financial condition.

Overview

The following table summarizes the generation portfolio as of September 30, 2017, by Registrant:

	(In MW)(a)
Generation Type	GenOn	GenOn Americas Generation	GenOn Mid-Atlantic
Natural gas (b)(c)	9,348	3,011	1,864
Coal	4,200	2,433	2,433
Oil	1,847	1,434	308
Total generation capacity	15,395	6,878	4,605

(a) MW figures provided represent nominal summer net MW capacity of power generated as adjusted for the Registrants' owned or leased interest excluding capacity from inactive/mothballed units.

(b) GenOn's natural gas generation portfolio excludes 1,029 MW related to Pittsburg Generating Station, a natural gas-fired facility located in California, which was deactivated by GenOn Americas Generation on January 1, 2017, as a result of notification received during 2016 that its bid for a resource adequacy contract for 2017 with Pacific Gas & Electric was not accepted.

(c) GenOn's natural gas generation portfolio includes 275 MW related to Choctaw Unit 1 which is in forced outage and is expected to return to service in December 2017.

GenOn Chapter 11 Cases

On the Petition Date, the GenOn Entities filed voluntary petitions for relief under Chapter 11, or the Chapter 11 Cases, of the Bankruptcy Code. GenOn Mid-Atlantic, as well as its consolidated subsidiaries, REMA, and certain other subsidiaries, did not file for relief under Chapter 11.

The GenOn Entities remain in possession of their property and continue their business operations in the ordinary course uninterrupted as "debtors-in-possession" under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court. See Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q, for more information on the Chapter 11 Cases.

On June 29, 2017, the GenOn Entities filed the Plan and the Disclosure Statement with the Bankruptcy Court consistent with the Restructuring Support Agreement. On September 18, 2017 and October 2, 2017, the GenOn Entities filed the Amended Plan and Amended Disclosure Statement and Second Amended Plan and Second Amended Disclosure Statement, respectively, which primarily provided the GenOn Entities with the flexibility to complete sales of certain assets pursuant to the Amended Plan and removed the GenOn Entities' requirement to conduct a rights offering in connection with the GenOn Entities' exit financing.

On October 31, 2017, the GenOn Entities announced that they entered into a Consent Agreement with certain holders of GenOn’s Senior Notes and GenOn Americas Generation's Senior Notes, collectively, the Consenting Holders, whereby the GenOn Entities and the Consenting Holders have agreed to extend the milestones in the Restructuring Support Agreement, by which the Plan must become effective, or the Effective Date. Specifically, the Consent Agreement extends the Effective Date milestone to June 30, 2018 or September 30, 2018, if regulatory approvals are still pending, or the Extended Effective Dates. The Consenting Holders’ consent to the Extended Effective Dates is contingent upon entry of an order as described in the Consent Agreement.

In addition, the GenOn Entities announced that, over the course of the past several weeks, both the principals and advisors of NRG and GenOn have been engaged in lengthy in-person negotiations in an effort to settle certain items that remained open and unresolved after the pre-petition Restructuring Support Agreement negotiations. These arms-length discussions included key topics such as: (i) timeline and transition, (ii) cooperation and co-development matters, (iii) post-employment and retiree health and welfare benefits and pension benefits, (iv) tax matters, and (v) intercompany balances. The agreements reached on these topics will be incorporated into definitive documents for GenOn’s emergence from Chapter 11.

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On October 30, 2017, the GenOn Entities filed the Plan Supplement Documents, consisting of, among other things, new organizational documents, new exit financing documents, a pension indemnity agreement, an employee matters agreement, schedules of assumed and rejected executory contracts and unexpired leases, and the Backstop Commitment Letter.  The Plan Supplement Documents are subject to ongoing review, revision, and further negotiation by the parties to the Restructuring Support Agreement including the GenOn Debtors, Consenting Holders and NRG, who have various consent rights over the final form of the Plan Supplement Documents, and may be amended, modified, supplemented, and revised in accordance with those ongoing negotiations.

Liquidity and Ability to Continue as a Going Concern

As described above, GenOn Energy, Inc. and GenOn Americas Generation have submitted the Plan in connection with their Chapter 11 Cases. There is no assurance that the Plan will be approved by the requisite stakeholders, confirmed by the Bankruptcy Court, or successfully implemented thereafter. GenOn's and GenOn Americas Generation’s ability to continue as a going concern is dependent on many factors, including the successful confirmation of the Plan and emergence from bankruptcy. Given the uncertainty as to the outcome of these factors, there is substantial doubt about GenOn's and GenOn Americas Generation's ability to continue as a going concern.

The accompanying unaudited interim condensed consolidated financial statements have been prepared assuming GenOn will continue as a going concern, which contemplates continuity of operations, realization of assets and the satisfaction of liabilities in the normal course of business. As such, the accompanying unaudited interim condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of assets and their carrying amounts, or the amount and classification of liabilities that may result should GenOn be unable to continue as a going concern. Such adjustments could have a material adverse impact on GenOn's results of operations, cash flows and financial position.

With respect to GenOn Mid-Atlantic, a consolidated subsidiary of GenOn, management has determined that while it has sufficient cash on hand to fund current obligations including operating lease payments due under the GenOn Mid-Atlantic operating leases as of September 30, 2017, the potential significant adverse impact of financial stresses at GenOn Mid-Atlantic's parent companies and, to a lesser extent, any adverse impact resulting from the notification by GenOn Mid-Atlantic's lessors alleging the existence of certain lease events of default as further described in Note 8, Debt and Capital Leases, to the Condensed Consolidated Financial Statements of this Form 10-Q, has caused there to be substantial doubt about GenOn Mid-Atlantic's ability to continue as a going concern.

Operational Matters

GenOn Energy, Inc., through its subsidiary, NRG California South LP, owns and operates the Mandalay Generation Station, Units 1, 2 and 3 (“Mandalay”) located in Oxnard, California.  On October 19, 2017, NRG California South LP provided notice to the CPUC and the CAISO its intent to shut down and retire Mandalay by December 31, 2017.

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Regulatory Matters

The Registrants' regulatory matters are described in the Registrants' 2016 Form 10-K in Item 1, Business — Regulatory Matters. These matters have been updated below and in Note 12, Regulatory Matters, to the Condensed Consolidated Financial Statements of this Form 10-Q.

As owners of power plants and participants in wholesale energy markets, certain of the Registrants' subsidiaries are subject to regulation by various federal and state government agencies. These include the CFTC and FERC, as well as other public utility commissions in certain states where the Registrants' generating assets are located. In addition, the Registrants are subject to the market rules, procedures and protocols of the various ISO markets in which they participate. The Registrants must also comply with the mandatory reliability requirements imposed by NERC and the regional reliability entities in the regions where they operate.

PJM

Minimum Offer Price Rule Exemption Appeal —On July 7, 2017, the D.C. Circuit vacated a FERC order from 2013 related to an exemption to the Minimum Offer Price Rule, or MOPR, and remanded the issue back to FERC. On October 23, 2017, PJM re-filed its initial 2012 MOPR. FERC's ruling on PJM's renewed proposal could affect how generators participate in the PJM Base Residual Auction.

2020/2021 PJM Auction Results — On May 23, 2017, PJM announced the results of its 2020/2021 base residual auction. GenOn (including GenOn Americas Generation and GenOn Mid-Atlantic) cleared approximately 7,073 MW of Capacity Performance product. GenOn's expected capacity revenues from the 2020/2021 base residual auction for the 2020/2021 delivery year are approximately $239 million. GenOn Americas Generation (including GenOn Mid-Atlantic) cleared approximately 3,824 MW of Capacity Performance product in the 2020/2021 base residual auction. GenOn Americas Generation's (including GenOn Mid-Atlantic) expected capacity revenues from the 2020/2021 base residual auction for the 2020/2021 delivery year are approximately $120 million. For results of the 2019/2020 PJM base residual auction, refer to Item 1 - Business of the Registrants' 2016 Form 10-K.

The tables below provide a detailed description of the Registrants' base residual auction results:

GenOn:

	Capacity Performance Product
Zone	Cleared Capacity (MW)(1)	Price ($/MW-day)
EMAAC	496	$187.87
MAAC	6,040	$86.04
RTO	537	$76.53
Total	7,073

(1) Excludes cleared capacity related to Aurora, the sale of which was completed on July 12, 2016.

GenOn Americas Generation & GenOn Mid-Atlantic:

	Capacity Performance Product
Zone	Cleared Capacity (MW)	Price ($/MW-day)
MAAC (1)	3,824	$86.04
Total	3,824

(1) Plants that participate in the PJM auctions for GenOn Americas Generation are solely those operated by GenOn Mid-Atlantic.

New England (GenOn and GenOn Americas Generation)

2020/2021 ISO-NE Auction Results — On February 6, 2017, ISO-NE announced the results of its 2020/2021 forward capacity auction. GenOn, including GenOn Americas Generation, cleared 1,112 MW at $5.297 per KW month providing expected annual capacity revenues of $71 million.

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Peak Energy Rent Adjustment Complaint — On September 30, 2016, the New England Power Generators Association, or NEPGA, filed a complaint against ISO-NE asking FERC to find the Peak Energy Rent, or PER, unjust and unreasonable. The PER adjustment reduces capacity payments on days where energy prices exceed a pre-defined level, known as the "PER strike price." On January 9, 2017, FERC granted NEPGA’s complaint requiring a change to the methodology used to calculate the PER strike price. FERC also directed the parties to determine any refunds for PER paid between September 30, 2016 and May 31, 2018. On July 26, 2017, NEPGA filed settlement documents at FERC, which the Registrants did not oppose. The settlement is pending at FERC. The outcome of this matter will determine the amount of refunds that the Registrants' fleet may receive as a result of negotiating the PER strike price methodology.

General

State Out-Of-Market Subsidy Proposals — Certain states including Connecticut, New Jersey, Ohio and Pennsylvania have considered but have not enacted proposals to provide out-of-market subsidy payments to potentially uneconomic nuclear and fossil generating units.  The Registrants have opposed those efforts to provide out of market subsidies, and intend to continue opposing them in the future.   

Environmental Matters

The Registrants are subject to a wide range of environmental laws in the development, construction, ownership and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and maintained during operation of power plants. Requirements regarding GHGs, combustion byproducts, water discharge and use, and threatened and endangered species have been put in place in recent years. However, under the current U.S. presidential administration some of these rules are being reconsidered and reviewed. Future laws may require the addition of emissions controls or other environmental controls or impose restrictions on the operations of the Registrants' facilities, which could have a material effect on the Registrants' operations. Complying with environmental laws involves significant capital and operating expenses. The Registrants decide to invest capital for environmental controls based on the relative certainty of the requirements, an evaluation of compliance options, and the expected economic returns on capital.

A number of regulations with the potential to affect the Registrants and their facilities have been recently promulgated by the EPA but are being reconsidered, including ESPS/NSPS for GHGs, NAAQS revisions and implementation, and effluent guidelines. The Registrants are evaluating the potential outcomes and any resulting impacts of recently promulgated regulations that the EPA is now reconsidering and cannot fully predict such impacts until administrative reconsiderations and legal challenges are resolved. Federal and state environmental laws generally have become more stringent over time, although this trend could slow or pause in the near term with respect to federal laws under the current U.S. presidential administration.

The Registrants' environmental matters are described in the Registrants' 2016 Form 10-K in Item 1, Business - Environmental Matters and Item 1A, Risk Factors. These matters have been updated in Note 13,Environmental Matters, to the Condensed Consolidated Financial Statements of this Form 10-Q.

Ozone NAAQS — On October 26, 2015, the EPA promulgated a rule that reduces the ozone NAAQS to 0.070 ppm. Challenges to this rule have been stayed at the request of the EPA so that it can evaluate the rule. If the rule is not altered by the EPA and survives legal challenges, this more stringent NAAQS will obligate the states to develop plans to reduce NO_x (an ozone precursor), which could affect some of the Registrants' units.

Clean Power Plan — The attention in recent years on GHG emissions has resulted in federal regulations and state legislative and regulatory action. In October 2015, the EPA finalized the Clean Power Plan, or CPP, addressing GHG emissions from existing EGUs. On February 9, 2016, the U.S. Supreme Court stayed the CPP. The D.C. Circuit, sitting en banc, heard oral argument on the legal challenges to the CPP in September 2016. At the EPA's request, the D.C. Circuit agreed on April 28, 2017 to hold the case in abeyance. On October 16, 2017, the EPA proposed a rule to repeal the CPP. Accordingly, the CPP is not likely to survive.

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Regional Environmental Issues

Massachusetts Global Warming Solutions Act Proposed Regulation — In May 2016, the Massachusetts Supreme Judicial Court held that the Massachusetts DEP had not complied with the 2008 Global Warming Solutions Act, which requires establishing limits for sources of GHGs. The Court held that participation in RGGI was not sufficient.  In August 2017, the Massachusetts DEP finalized a regulation that, if it survives legal challenges, would limit GHG emissions, and may limit operations, from electric generating facilities located in Massachusetts.  The final regulation has been challenged in The Commonwealth of Massachusetts Superior Court of Suffolk County.

Changes in Accounting Standards

See Note 2, Summary of Significant Accounting Policies, to the Condensed Consolidated Financial Statements of this Form 10-Q,for a discussion of recent accounting developments.

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Consolidated Results of Operations

The consolidated results of operations is separately presented for GenOn Energy, Inc., GenOn Americas Generation, LLC, and GenOn Mid-Atlantic, LLC, for the three and nine months ended September 30, 2017 and 2016.  The following section includes a discussion of electricity prices, gross margin and economic gross margin along with other significant drivers impacting each of the Registrants’ results of operations.

Electricity Prices

The following tables summarize average on-peak power prices for each of the major markets in which the Registrants operate for the three and nine months ended September 30, 2017 and 2016.

	Average on Peak Power Price ($/MWh) (a)
	Three months ended September 30,
	2017		2016		Change %
MISO - Louisiana Hub (b)	$	39.56	$	39.92	(1	)%
NEPOOL	31.94		42.40		(25	)%
PEPCO (PJM)	38.81		42.60		(9	)%
PJM West Hub	35.10		38.89		(10	)%
CAISO - NP15	46.69		38.23		22	%
CAISO - SP15	46.54		40.43		15	%

(a) Average on-peak power prices based on day ahead settlement prices as published by the respective ISOs.

(b) Region also transacts in PJM - West Hub.

	Average on Peak Power Price ($/MWh) (a)
	Nine months ended September 30,
	2017		2016		Change %
MISO - Louisiana Hub (b)	$	42.33	$	33.50	26	%
NEPOOL	33.11		33.82		(2	)%
PEPCO (PJM)	35.65		38.16		(7	)%
PJM West Hub	33.30		33.97		(2	)%
CAISO - NP15	33.82		29.42		15	%
CAISO - SP15	33.42		30.29		10	%

(a) Average on-peak power prices based on day ahead settlement prices as published by the respective ISOs.

(b) Region also transacts in PJM - West Hub.

The following tables summarize average realized power prices for each Registrant for the three and nine months ended September 30, 2017 and 2016, which reflects the impact of settled hedges:

	Average Realized Power Price ($/MWh)
	Three months ended September 30,
Region	2017		2016(b)		Change %
GenOn	$	42.94	$	42.58	1	%
GenOn Americas Generation(a)	48.68		54.34		(10	)%
GenOn Mid-Atlantic	52.63		55.86		(6	)%

(a) Excludes pass-through amounts for GenOn Energy Management.

(b) Excludes closure and financial settlement of certain open positions with counterparties that would have otherwise been realized in subsequent periods.

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	Average Realized Power Price ($/MWh)
	Nine months ended September 30,
Region	2017(b)		2016(b)		Change %
GenOn	$	44.75	$	46.49	(4	)%
GenOn Americas Generation(a)	67.36		72.42		(7	)%
GenOn Mid-Atlantic	72.93		74.33		(2	)%

(a) Excludes pass-through amounts for GenOn Energy Management.

(b) Excludes closure and financial settlement of certain open positions with counterparties that would have otherwise been realized in subsequent periods.

Gross Margin

The Registrants calculate gross margin in order to evaluate operating performance as operating revenues less cost of sales, which includes cost of fuel, other costs of sales, contract and emission credit amortization and mark-to-market gains or losses on economic hedging activities.

Economic Gross Margin

In addition to gross margin, the Registrants evaluate their operating performance using the measure of economic gross margin, which is not a GAAP measure and may not be comparable to other companies’ presentations or deemed more useful than the GAAP information provided elsewhere in this report. Economic gross margin should be viewed as a supplement to and not a substitute for the Registrants' presentation of gross margin, which is the most directly comparable GAAP measure. Economic gross margin is not intended to represent gross margin. The Registrants believe that economic gross margin is useful to investors as it is a key operational measure reviewed by the Registrants' chief operating decision maker. Economic gross margin is defined as the sum of energy revenue, capacity revenue and other revenue, less cost of fuel and other cost of sales.

Economic gross margin does not include mark-to-market gains or losses on economic hedging activities that are not yet settled, contract and emission credit amortization or other operating costs.

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GenOn

The following table provides selected financial information for GenOn:

	Three months ended September 30,									Nine months ended September 30,
(In millions except otherwise noted)	2017			2016			Change			2017			2016			Change
Operating Revenues
Energy revenue (a)	$	306		$	508		$	(202	)	$	739		$	1,144		$	(405	)
Capacity revenue (a)	192			157			35			458			533			(75		)
Mark-to-market for economic hedging activities	(23		)	(142		)	119			7			(233		)	240
Other revenues	9			9			—			27			65			(38		)
Total operating revenues	484			532			(48		)	1,231			1,509			(278		)
Operating Costs and Expenses
Generation cost of sales (a)	211			265			(54		)	500			625			(125		)
Mark-to-market for economic hedging activities	(4		)	(45		)	41			(9		)	(45		)	36
Contract and emissions credit amortization	(9		)	(9		)	—			(28		)	(29		)	1
Operations and maintenance	101			129			(28		)	358			447			(89		)
Other cost of operations	15			13			2			55			46			9
Total cost of operations	314			353			(39		)	876			1,044			(168		)
Depreciation and amortization	43			59			(16		)	128			153			(25		)
Impairment losses	—			—			—			—			59			(59		)
General and administrative	11			10			1			26			14			12
General and administrative - affiliate	14			46			(32		)	100			139			(39		)
Total operating costs and expenses	382			468			(86		)	1,130			1,409			(279		)
Gain on sale of assets	—			262			(262		)	—			294			(294		)
Operating Income	102			326			(224		)	101			394			(293		)
Other Income/(Expense)
Other income, net	3			2			1			9			6			3
Interest expense	(4		)	(44		)	(40		)	(91		)	(132		)	(41		)
Other expense	—			—			—			(18		)	—			18
Total other expense	(1		)	(42		)	(41		)	(100		)	(126		)	(26		)
Income Before Reorganization Items and Income Taxes	101			284			(183		)	1			268			(267		)
Reorganization items, net	(29		)	—			(29		)	48			—			48
Income Before Income Taxes	72			284			(212		)	49			268			(219		)
Income tax expense	—			21			(21		)	7			20			(13		)
Net Income	$	72		$	263		$	(191	)	$	42		$	248		$	(206	)
Business Metrics
Average natural gas price — Henry Hub ($/MMBtu)	$	3.00		$	2.81		7		%	$	3.17		$	2.29		38		%
MWh sold (in thousands) (b)	7,126			9,628			(26		)%	16,395			21,683			(24		)%
MWh generated (in thousands)	7,339			9,531			(23		)%	16,609			21,684			(23		)%

(a) Includes realized gains and losses from financially settled transactions.

(b) MWh sold excludes generation at facilities that generate revenue under tolling agreements.

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The following table presents the composition and reconciliation of GenOn's gross margin and economic gross margin for the three and nine months ended September 30, 2017 and 2016:

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Energy revenue	$	306		$	508		$	739		$	1,144
Capacity revenue	192			157			458			533
Mark-to-market for economic hedging activities	(23		)	(142		)	7			(233		)
Other revenues	9			9			27			65
Operating revenue	484			532			1,231			1,509
Cost of fuel	(193		)	(244		)	(463		)	(549		)
Other cost of sales	(18		)	(21		)	(37		)	(76		)
Mark-to-market for economic hedging activities	4			45			9			45
Contract and emission credit amortization	9			9			28			29
Gross margin	$	286		$	321		$	768		$	958
Less: Mark-to-market for economic hedging activities, net	(19		)	(97		)	16			(188		)
Less: Contract and emission credit amortization, net	9			9			28			29
Economic gross margin	$	296		$	409		$	724		$	1,117

GenOn's gross margin decreased by $35 million and economic gross margin decreased by $113 million for the three months ended September 30, 2017, compared to the same period in 2016 due to:

	(In millions)
Lower gross margin due to the early closure and financial settlement of certain open positions with a counterparty in 2016	$	(98	)
Lower gross margin due to a 23% decline in economic generation primarily at GenOn Mid-Atlantic as a result of milder weather conditions and unplanned outages	(29		)
Lower gross margin due to a 3% decrease in average realized energy prices as well as less favorable short-term natural gas contract terms	(18		)
Lower gross margin due to lower volume of contract capacity as a result of deactivation of the Pittsburg facility	(11		)
Higher gross margin due to a 15% increase in PJM cleared auction capacity prices as a result of higher prices in the 2017/2018 capacity performance auction year as well as a 12% increase in PJM cleared auction capacity volumes at Shawville, partially offset by higher purchased capacity to cover capacity supply obligations at Portland	24
Higher gross margin due to higher capacity prices at Bowline and in Southern California due to short-term resource adequacy contracts, partially offset by lower capacity volumes at Bowline	18
Other	1
Decrease in economic gross margin	$	(113	)
Increase in mark-to-market for economic hedging primarily due to reversals of previously recognized unrealized gains/losses on settled positions and unrealized gains/losses on open positions related to economic hedges as further described below	78
Decrease in gross margin	$	(35	)

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GenOn's gross margin decreased by $190 million and economic gross margin decreased by $393 million for the nine months ended September 30, 2017, compared to the same period in 2016 due to:

	(In millions)
Lower gross margin due to the early closure and financial settlement of certain open positions with counterparties in 2016, partially offset by similar early financial settlements in 2017	$	(131	)
Lower gross margin due to a 22% decline in economic generation primarily at GenOn Mid-Atlantic, Avon Lake, and Cheswick as a result of milder weather conditions	(86		)
Lower gross margin due to a 5% decrease in realized hedge prices as well as spark spread contraction due to an increase in natural gas prices and less favorable short-term natural gas contract terms	(82		)
Lower gross margin due to deactivation of the Pittsburg facility and sales of Seward, Shelby and Aurora facilities in 2016	(56		)
Lower gross margin due to the sale of emission credits in the first quarter of the prior year	(36		)
Lower gross margin due to a 14% decrease in PJM cleared auction capacity prices resulting from changes in the mix of capacity prices in the relevant auction years, partially offset by lower purchased capacity to cover supply obligations and a 6% increase in PJM cleared auction capacity volumes due to prior year conversions	(13		)
Higher gross margin due to higher capacity prices at New York and New England due to short-term resource adequacy contracts, partially offset by lower capacity volumes	12
Other	(1		)
Decrease in economic gross margin	$	(393	)
Increase in mark-to-market for economic hedging primarily due to reversals of previously recognized unrealized gains/losses on settled positions and unrealized gains/losses on open positions related to economic hedges as further described below	204
Decrease in contract and emission credit amortization	(1		)
Decrease in gross margin	$	(190	)

Mark-to-market for Economic Hedging Activities

Mark-to-market for economic hedging activities includes asset-backed hedges that have not been designated as cash flow hedges.

The breakdown of gains and losses included in GenOn's operating revenues and operating costs and expenses are as follows:

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Mark-to-market results in operating revenues
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	7		$	(45	)	$	(4	)	$	(212	)
Net unrealized (losses)/gains on open positions related to economic hedges	(30		)	(97		)	11			(21		)
Total mark-to-market (losses)/gains in operating revenues	$	(23	)	$	(142	)	$	7		$	(233	)
Mark-to-market results in operating costs and expenses
Reversal of previously recognized unrealized losses on settled positions related to economic hedges	$	2		$	16		$	11		$	67
Net unrealized gains/(losses) on open positions related to economic hedges	2			29			(2		)	(22		)
Total mark-to-market gains in operating costs and expenses	$	4		$	45		$	9		$	45

Mark-to-market results consist of unrealized gains and losses on contracts that are not yet settled. The settlement of these transactions is reflected in the same revenue or cost financial statement caption as the items being hedged.

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For the three months ended September 30, 2017, the $23 million loss in operating revenues from economic hedge positions was primarily driven by decreases in the value of forward purchases of northeast natural gas contracts as a result of a decrease in forward northeast natural gas prices, as well as decreases in sales of power contracts as a result of increases in outer year forward power prices, partially offset by the reversal of previously recognized unrealized losses from electricity contracts that settled during the period. The $4 million gain in operating costs and expenses from economic hedge positions was driven by the reversal of previously recognized unrealized losses from contracts that settled during the period, as well as an increase in the value of forward purchases of fuel contracts as a result of increases in 2017 coal prices.

For the three months ended September 30, 2016, the $142 million loss in operating revenues from economic hedge positions was primarily driven by a decrease in the value of forward purchases of natural gas contracts as a result of decreases in forward natural gas prices, as well as the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period. The $45 million gain in operating costs and expenses from economic hedge positions was primarily driven by an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices, as well as the reversal of previously recognized unrealized losses from coal contracts that settled during the period.

For the nine months ended September 30, 2017, the $7 million gain in operating revenues from economic hedge positions was primarily driven by an increase in the value of forward sales of power contracts as a result of decreases in forward power prices, partially offset by the reversal of previously recognized unrealized gains from natural gas contracts that settled during the period. The $9 million gain in operating costs and expenses from economic hedge positions was driven by the reversal of previously recognized unrealized losses from natural gas and coal contracts that settled during the period, offset by a decrease in the value of forward purchases of fuel contracts as a result of decreases in forward coal prices.

For the nine months ended September 30, 2016, the $233 million loss in operating revenues from economic hedge positions was primarily driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period, as well as decreases in the value of new natural gas and power deals executed during the year. The $45 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from coal contracts that settled during the period, partially offset by decreases in the value of new coal contracts executed during the year.

Operations and Maintenance

Operations and maintenance decreased by $28 million for the three months ended September 30, 2017, compared to the same period in 2016 primarily due to lower operating and maintenance costs driven by the timing of unplanned outages at GenOn Mid-Atlantic, Bowline, and Canal as well as lower variable operating costs due to lower generation.

Operations and maintenance decreased by $89 million for the nine months ended September 30, 2017, compared to the same period in 2016 primarily due to the following:

	(In millions)
Lower maintenance costs due to prior year environmental control work at Avon Lake and prior year gas additions at Shawville and New Castle	$	(32	)
Lower operating and maintenance costs due to lower planned and unplanned outages primarily at GenOn Mid-Atlantic and Southern California	(32		)
Lower environmental expense at GenOn Mid-Atlantic for Maryland Ash sites in 2017	(15		)
Lower operating and maintenance costs due to the sales of Seward, Shelby and Aurora during the first and third quarters of 2016	(10		)
Lower maintenance costs due to the deactivation of Pittsburg facility in the first quarter of 2017	(9		)
Higher maintenance costs due to higher planned outages at Cheswick in 2017	10
Other	(1		)
	$	(89	)

Other Cost of Operations

Other cost of operations increased by $2 million for the three months ended September 30, 2017, compared to the same period in 2016 due to favorable property tax settlements received in the third quarter of 2016 for Chalk Point and Dickerson at GenOn Mid-Atlantic.

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Other cost of operations increased by $9 million for the nine months ended September 30, 2017, compared to the same period in 2016 primarily due to favorable property tax settlements received in the first and third quarters of 2016 for Chalk Point and Dickerson at GenOn Mid-Atlantic.

Impairment Losses

During the nine months ended September 30, 2016, GenOn recorded an impairment loss of $59 million primarily due to impairment of Mandalay and Ormond Beach operating units. These losses are further described in Note 7, Impairments.

General and Administrative Expenses

General and administrative expenses increased by $12 million during the nine months ended September 30, 2017, compared to the same period in 2016 due to costs incurred, primarily in the first quarter, in connection with advisors and other consultants engaged to assist GenOn and its creditors with regards to the Chapter 11 proceedings as further discussed in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

General and Administrative Expenses - Affiliate

General and administrative expenses - affiliate decreased by $32 million during the three months ended September 30, 2017 and decreased by $39 million during the nine months ended September 30, 2017, compared to the same periods in 2016 primarily due to a decrease in the amended shared service fee during the pendency of Chapter 11 Cases as further described in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

Gain on Sale of Assets

The $262 million gain on sale of assets during the three months ended September 30, 2016 reflects the $74 million gain on sale of Potrero real property and a $188 million gain on sale of the Aurora Generating Station during the third quarter of 2016.

The $294 million gain on sale of assets during the nine months ended September 30, 2016 reflects the $74 million gain on sale of Potrero real property, $188 million gain on sale of the Aurora Generating Station, $29 million gain on sale of the Shelby Generating Station and a $3 million gain on the sale of an easement of land at Potrero during the first quarter of 2016.

Interest Expense

Interest expense decreased by $40 million during the three months ended September 30, 2017 and decreased by $41 million during the nine months ended September 30, 2017, compared to the same periods in 2016 primarily due to the filing of Chapter 11 Cases which constitutes an event of default on GenOn and GenOn Americas Generation Senior Notes in June of 2017 as further described in Note 3, Chapter 11 Cases to the Condensed Consolidated Financial Statements of this Form 10-Q.

Other Expense

During the nine months ended September 30, 2017, GenOn recorded other expense of $18 million, which represent costs associated with the 2022 Notes that were not assumed, as further described in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

Reorganization Items

During the three months ended September 30, 2017, GenOn recorded loss for reorganization items of $29 million, which relates to advisory and legal costs directly associated with the Chapter 11 proceedings since the Petition Date as further discussed in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

During the nine months ended September 30, 2017, GenOn recorded income for reorganization items of $48 million, which relates to the removal of debt premiums and credit reserve amounts, partially offset by advisory and legal costs directly associated with the Chapter 11 proceedings since the Petition Date as further discussed in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

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Income Tax Expense

For the three months ended September 30, 2017, GenOn recorded an income tax expense of $0 million on pre-tax income of $72 million. For the same period in 2016, GenOn recorded an income tax expense of $21 million on pre-tax income of $284 million. The effective tax rate was 0.0% and 7.4% for the three months ended September 30, 2017, and 2016, respectively.

For the nine months ended September 30, 2017, GenOn recorded an income tax expense of $7 million on pre-tax income of $49 million. For the same period in 2016, GenOn recorded an income tax expense of $20 million on a pre-tax income of $268 million. The effective tax rate was 14.3% and 7.5% for the nine months ended September 30, 2017, and 2016, respectively.

For the three months ended September 30, 2017, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance.

For the nine months ended September 30, 2017, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance, partially offset by the impact of state income taxes.

For the three and nine months ended September 30, 2016, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance, offset by the impact of state income taxes associated with the disposition of generating stations during the year.

61

GenOn Americas Generation

The following table provides selected financial information for GenOn Americas Generation:

	Three months ended September 30,									Nine months ended September 30,
(In millions except otherwise noted)	2017			2016			Change			2017			2016			Change
Operating Revenues
Energy revenue (a)	$	236		$	459		$	(223	)	$	605		$	1,041		$	(436	)
Capacity revenue (a)	195			160			35			464			550			(86		)
Mark-to-market for economic hedging activities	(6		)	(75		)	69			(1		)	(228		)	227
Other revenues	4			6			(2		)	12			15			(3		)
Total operating revenues	429			550			(121		)	1,080			1,378			(298		)
Operating Costs and Expenses
Generation cost of sales (a)	310			403			(93		)	733			937			(204		)
Mark-to-market for economic hedging activities	(4		)	(35		)	31			(9		)	(40		)	31
Contract and emissions credit amortization	—			1			(1		)	—			1			(1		)
Operations and maintenance	49			65			(16		)	180			227			(47		)
Other cost of operations	9			2			7			33			18			15
Total cost of operations	364			436			(72		)	937			1,143			(206		)
Depreciation and amortization	18			21			(3		)	54			59			(5		)
General and administrative	6			—			6			6			—			6
General and administrative - affiliate	9			21			(12		)	53			62			(9		)
Total operating costs and expenses	397			478			(81		)	1,050			1,264			(214		)
Gain on sale of assets	—			74			(74		)	—			77			(77		)
Operating Income	32			146			(114		)	30			191			(161		)
Other Income/(Expense)
Other income, net	1			1			—			2			2			—
Interest expense	(1		)	(15		)	(14		)	(26		)	(44		)	(18		)
Total other expense	—			(14		)	(14		)	(24		)	(42		)	(18		)
Income Before Reorganization Items and Income Taxes	32			132			(100		)	6			149			(143		)
Reorganization items, net	—			—			—			42			—			42
Income Before Income Taxes	32			132			(100		)	48			149			(101		)
Income tax	—			—			—			—			—			—
Net Income	$	32		$	132		$	(100	)	$	48		$	149		$	(101	)
Business Metrics
Average natural gas price — Henry Hub ($/MMBtu)	$	3.00		$	2.81		7		%	$	3.17		$	2.29		38		%
MWh sold (in thousands)	2,013			4,251			(53		)%	3,722			8,396			(56		)%
MWh generated (in thousands)	2,005			4,166			(52		)%	3,709			8,368			(56		)%

(a)    Includes realized gains and losses from financially settled transactions.

62

The following table presents the composition and reconciliation of GenOn Americas Generation's gross margin and economic gross margin for the three and nine months ended September 30, 2017 and 2016:

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Energy revenue	$	236		$	459		$	605		$	1,041
Capacity revenue	195			160			464			550
Mark-to-market for economic hedging activities	(6		)	(75		)	(1		)	(228		)
Other revenues	4			6			12			15
Operating revenue	429			550			1,080			1,378
Cost of fuel	(79		)	(175		)	(208		)	(339		)
Other cost of sales	(231		)	(228		)	(525		)	(598		)
Mark-to-market for economic hedging activities	4			35			9			40
Contract and emissions credit amortization	—			(1		)	—			(1		)
Gross margin	$	123		$	181		$	356		$	480
Less: Mark-to-market for economic hedging activities, net	(2		)	(40		)	8			(188		)
Less: Contract and emission credit amortization, net	—			(1		)	—			(1		)
Economic gross margin	$	125		$	222		$	348		$	669

GenOn Americas Generation's gross margin and economic gross margin reflects pass-through amounts for GenOn Energy Management for services including the bidding and dispatch of the generating units, fuel procurement and the execution of contracts, including economic hedges, to reduce price risk. The following table reflects the results for GenOn Energy Management included in GenOn Americas Generation's gross margin and economic gross margin above:

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Energy revenue	$	138		$	178		$	349		$	348
Capacity revenue	93			72			209			257
Other revenues	1			2			3			4
Operating revenue	232			252			561			609
Cost of fuel	(10		)	(42		)	(55		)	(60		)
Other cost of sales	(222		)	(210		)	(506		)	(549		)
Gross margin and economic gross margin	$	—		$	—		$	—		$	—

63

GenOn Americas Generation's gross margin decreased by $58 million and economic gross margin decreased by $97 million for the three months ended September 30, 2017, compared to the same period in 2016 due to:

	(In millions)
Lower gross margin at GenOn Mid-Atlantic due to a 59% decrease in economic generation as a result of milder weather conditions as well as a 8% decrease in average realized hedge prices	$	(58	)
Lower gross margin at GenOn Mid-Atlantic due to the early closure and financial settlement of certain open positions with a counterparty in 2016	(50		)
Lower gross margin due to lower volume of contract capacity as a result of deactivation of the Pittsburg facility	(11		)
Higher gross margin due to increased capacity prices in New England, partially offset by lower capacity volumes in New York	15
Higher gross margin at GenOn Mid-Atlantic due to a 17% increase in PJM cleared auction capacity prices as a result of higher prices in the 2017/2018 capacity performance auction year	9
Other	(2		)
Decrease in economic gross margin	$	(97	)
Increase in mark-to-market for economic hedging primarily due to reversals of previously recognized unrealized gains/losses on settled positions and unrealized gains/losses on open positions related to economic hedges as further described below	38
Increase in contract and emission credit amortization	1
Decrease in gross margin	$	(58	)

GenOn Americas Generation's gross margin decreased by $124 million and economic gross margin decreased by $321 million for the nine months ended September 30, 2017, compared to the same period in 2016 due to:

	(In millions)
Lower gross margin at GenOn Mid-Atlantic due to a 61% decrease in economic generation as a result of milder weather conditions as well as a decrease in average realized hedge prices	$	(180	)
Lower gross margin at GenOn Mid-Atlantic due to the early closure and financial settlement of certain open positions with counterparties in 2016, partially offset by similar early financial settlements in 2017	(80		)
Lower gross margin due to lower volume of contract capacity as a result of deactivation of the Pittsburg facility	(34		)
Lower gross margin in New York and New England due to 7% lower realized prices as well as a 28% decrease in generation at Bowline and Canal due to planned outages	(27		)
Lower gross margin at GenOn Mid-Atlantic due to a 12% decrease in PJM cleared auction capacity prices resulting from changes in the mix of capacity prices in the relevant auction years, partially offset by a 3% increase in PJM cleared auction capacity volumes and lower purchased capacity	(14		)
Higher gross margin due to an increase in New York and New England capacity prices, partially offset by lower purchased capacity at Canal	19
Other	(5		)
Decrease in economic gross margin	$	(321	)
Increase in mark-to-market for economic hedging primarily due to reversals of previously recognized unrealized gains/losses on settled positions and unrealized gains/losses on open positions related to economic hedges as further described below	196
Increase in contract and emission credit amortization	1
Decrease in gross margin	$	(124	)

64

Mark-to-market for Economic Hedging Activities

Mark-to-market for economic hedging activities includes asset-backed hedges that have not been designated as cash flow hedges.

The breakdown of gains and losses included in GenOn Americas Generation's operating revenues and operating costs and expenses are as follows:

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Mark-to-market results in operating revenues
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	9		$	(61	)	$	(9	)	$	(225	)
Net unrealized (losses)/gains on open positions related to economic hedges	(15		)	(14		)	8			(3		)
Total mark-to-market losses in operating revenues	$	(6	)	$	(75	)	$	(1	)	$	(228	)
Mark-to-market results in operating costs and expenses
Reversal of previously recognized unrealized losses on settled positions related to economic hedges	$	2		$	15		$	11		$	60
Net unrealized gains/(losses) on open positions related to economic hedges	2			20			(2		)	(20		)
Total mark-to-market gains in operating costs and expenses	$	4		$	35		$	9		$	40

Mark-to-market results consist of unrealized gains and losses on contracts that are not yet settled. The settlement of these transactions is reflected in the same revenue or cost financial statement caption as the items being hedged.

For the three months ended September 30, 2017, the $6 million loss in operating revenues from economic hedge positions was primarily driven by a decrease in the value of forward purchases of natural gas contracts as a result of decreases in 2017 natural gas prices, as well as decreases in sales of power contracts as a result of increases in outer year forward power prices, partially offset by the reversal of previously recognized unrealized losses from electricity contracts that settled during the period. The $4 million gain in operating costs and expenses from economic hedge positions was driven by the reversal of previously recognized unrealized losses from coal contracts that settled during the period, as well as an increase in the value of forward purchases of fuel contracts as a result of increases in 2017 coal prices.

For the three months ended September 30, 2016, the $75 million loss in operating revenues from economic hedge positions was primarily driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period as well as a decrease in the value of forward purchases of natural gas contracts as a result of decreases in forward natural gas prices. The $35 million gain in operating costs and expenses from economic hedge positions was primarily driven by an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices, as well as the reversal of previously recognized unrealized losses from coal contracts that settled during the period.

For the nine months ended September 30, 2017, the $1 million loss in operating revenues from economic hedge positions was primarily driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period, largely offset by an increase in the value of forward sales of power contracts as a result of decreases in forward power prices. The $9 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from natural gas and coal contracts that settled during the period, partially offset by a decrease in the value of forward purchases of fuel contracts as a result of decreases in forward coal prices.

For the nine months ended September 30, 2016, the $228 million loss in operating revenues from economic hedge positions was primarily driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period. The $40 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from coal contracts that settled during the period, partially offset by decreases in the value of new coal contracts executed during the year.

65

Operations and Maintenance

Operations and maintenance decreased by $16 million for the three months ended September 30, 2017, compared to the same period in 2016 primarily due to lower operating and maintenance costs driven by a decrease in unplanned maintenance expense as a result of lower generation, and lower maintenance costs due to deactivation of the Pittsburg facility.

Operations and maintenance decreased by $47 million for the nine months ended September 30, 2017, compared to the same period in 2016 primarily due to a decrease in environmental expense for Maryland Ash compared to the prior year along with lower operating and maintenance costs driven by a decrease in planned and unplanned maintenance expense as a result of lower generation.

Other Cost of Operations

Other cost of operations increased by $7 million for the three months ended September 30, 2017, compared to the same period in 2016 primarily due to favorable property tax settlements received in the third quarter of 2016 for Chalk Point and Dickerson at GenOn Mid-Atlantic.

Other cost of operations increased by $15 million for the nine months ended September 30, 2017, compared to the same period in 2016 primarily due to favorable property tax settlements received in the first and third quarters of 2016 for Chalk Point and Dickerson at GenOn Mid-Atlantic.

General and Administrative Expenses

General and administrative expenses increased by $6 million during the three and nine months ended September 30, 2017, compared to the same periods in 2016 due to increased professional fees for legal matters.

General and Administrative Expenses - Affiliate

General and administrative expenses - affiliate decreased by $12 million during the three months ended September 30, 2017 and decreased by $9 million during the nine months ended September 30, 2017, compared to the same periods in 2016 primarily due to a decrease in the amended shared service fee during the pendency of Chapter 11 Cases as further described in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

Gain on Sale of Assets

The $74 million gain on sale of assets during the three months ended September 30, 2016 reflects the gain on the sale of Potrero real property during the third quarter of 2016.

The $77 million gain on sale of assets during the nine months ended September 30, 2016 reflects the $74 million gain on the sale of Potrero real property during the third quarter of 2016 and a $3 million gain on the sale of an easement of land at Potrero during the first quarter of 2016.

Interest Expense

Interest expense decreased by $14 million during the three months ended September 30, 2017 and decreased by $18 million during the nine months ended September 30, 2017, compared to the same periods in 2016 primarily due to the filing of Chapter 11 Cases which constitutes an event of default on GenOn Americas Generation Senior Notes in June 2017 as further described in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

Reorganization Items

During the nine months ended September 30, 2017, GenOn Americas Generation recorded income for reorganization items of $42 million, which primarily relates to the removal of debt premiums and credit reserve amounts as further discussed in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

Income Tax Expense/(Benefit)

GenOn Americas Generation is not subject to income taxes except for those subsidiaries of GenOn Americas Generation that are separate taxpayers.

For the three and nine months ended September 30, 2017 and 2016, GenOn Americas Generation was not allocated income taxes attributable to its operations on a pro forma income tax provision basis.

66

GenOn Mid-Atlantic

The following table provides selected financial information for GenOn Mid-Atlantic:

	Three months ended September 30,									Nine months ended September 30,
(In millions except otherwise noted)	2017			2016			Change			2017			2016			Change
Operating Revenues
Energy revenue (a)	$	80		$	263		$	(183	)	$	209		$	612		$	(403	)
Capacity revenue (a)	58			48			10			154			171			(17		)
Mark-to-market for economic hedging activities	(10		)	(83		)	73			(2		)	(203		)	201
Other revenues	2			2			—			5			5			—
Total operating revenues	130			230			(100		)	366			585			(219		)
Operating Costs and Expenses
Generation cost of sales (a)	64			140			(76		)	137			284			(147		)
Mark-to-market for economic hedging activities	(5		)	(40		)	35			—			(39		)	39
Operations and maintenance	44			48			(4		)	143			181			(38		)
Other cost of operations	7			(1		)	8			23			9			14
Total cost of operations	110			147			(37		)	303			435			(132		)
Depreciation and amortization	16			16			—			47			45			2
General and administrative	6			—			6			6			—			6
General and administrative — affiliate	4			15			(11		)	42			45			(3		)
Total operating costs and expenses	136			178			(42		)	398			525			(127		)
Operating (Loss)/Income	(6		)	52			(58		)	(32		)	60			(92		)
Other Income/(Expense)
Other income	1			1			—			1			1			—
Interest expense	(1		)	(2		)	(1		)	(2		)	(4		)	(2		)
Total other expense	—			(1		)	(1		)	(1		)	(3		)	(2		)
(Loss)/Income Before Income Taxes	(6		)	51			(57		)	(33		)	57			(90		)
Income tax	—			—			—			—			—			—
Net (Loss)/Income	$	(6	)	$	51		$	(57	)	$	(33	)	$	57		$	(90	)
Business Metrics
Average natural gas price — Henry Hub ($/MMBtu)	$	3.00		$	2.81		7		%	$	3.17		$	2.29		38		%
MWh sold (in thousands)	1,520			3,813			(60		)%	2,793			7,090			(61		)%
MWh generated (in thousands)	1,519			3,734			(59		)%	2,792			7,090			(61		)%

(a)    Includes realized gains and losses from financially settled transactions.

67

The following table presents the composition and reconciliation of GenOn Mid-Atlantic's gross margin and economic gross margin for the three and nine months ended September 30, 2017 and 2016:

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Energy revenue	$	80		$	263		$	209		$	612
Capacity revenue	58			48			154			171
Mark-to-market for economic hedging activities	(10		)	(83		)	(2		)	(203		)
Other revenues	2			2			5			5
Operating revenue	130			230			366			585
Cost of fuel	(57		)	(124		)	(122		)	(247		)
Other cost of sales	(7		)	(16		)	(15		)	(37		)
Mark-to-market for economic hedging activities	5			40			—			39
Gross margin	$	71		$	130		$	229		$	340
Less: Mark-to-market for economic hedging activities, net	(5		)	(43		)	(2		)	(164		)
Economic gross margin	$	76		$	173		$	231		$	504

GenOn Mid-Atlantic's gross margin decreased by $59 million and economic gross margin decreased by $97 million for the three months ended September 30, 2017, compared to the same period in 2016 due to:

	(In millions)
Lower gross margin due to a 59% decrease in economic generation as a result of milder weather conditions as well as an 8% decrease in average realized hedge prices	$	(58	)
Lower gross margin due to the early closure and financial settlement of certain open positions with a counterparty in 2016	(50		)
Higher gross margin due to a 17% increase in PJM cleared auction capacity prices as a result of higher prices in the 2017/2018 capacity performance auction year	9
Other	2
Decrease in economic gross margin	$	(97	)
Increase in mark-to-market for economic hedging primarily due to reversals of previously recognized unrealized gains/losses on settled positions and unrealized gains/losses on open positions related to economic hedges as further described below	38
Decrease in gross margin	$	(59	)

GenOn Mid-Atlantic's gross margin decreased by $111 million and economic gross margin decreased by $273 million for the nine months ended September 30, 2017, compared to the same period in 2016 due to:

	(In millions)
Lower gross margin due to a 61% decrease in economic generation as a result of milder weather conditions as well as a decrease in average realized hedge prices	$	(180	)
Lower gross margin due to the early closure and financial settlement of certain open positions with counterparties in 2016, partially offset by similar early financial settlements in 2017	(80		)
Lower gross margin due to a 12% decrease in PJM cleared auction capacity prices resulting from changes in the mix of capacity prices in the relevant auction years, partially offset by a 3% increase in PJM cleared auction capacity volumes and lower purchased capacity	(14		)
Other	1
Decrease in economic gross margin	$	(273	)
Increase in mark-to-market for economic hedging primarily due to reversals of previously recognized unrealized gains/losses on settled positions and unrealized gains/losses on open positions related to economic hedges as further described below	162
Decrease in gross margin	$	(111	)

68

Mark-to-market for Economic Hedging Activities

Mark-to-market for economic hedging activities includes asset-backed hedges that have not been designated as cash flow hedges.

The breakdown of gains and losses included in GenOn Mid-Atlantic's operating revenues and operating costs and expenses are as follows:

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Mark-to-market results in operating revenues
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	5		$	(62	)	$	(8	)	$	(201	)
Net unrealized (losses)/gains on open positions related to economic hedges	(15		)	(21		)	6			(2		)
Total mark-to-market losses in operating revenues	$	(10	)	$	(83	)	$	(2	)	$	(203	)
Mark-to-market results in operating costs and expenses
Reversal of previously recognized unrealized losses on settled positions related to economic hedges	$	2		$	15		$	5		$	55
Net unrealized gains/(losses) on open positions related to economic hedges	3			25			(5		)	(16		)
Total mark-to-market gains in operating costs and expenses	$	5		$	40		$	—		$	39

Mark-to-market results consist of unrealized gains and losses on contracts that are not yet settled. The settlement of these transactions is reflected in the same revenue or financial statement cost caption as the items being hedged.

For the three months ended September 30, 2017, the $10 million loss in operating revenues from economic hedge positions was primarily driven by a decrease in the value of forward sales of power contracts as a result of increases in 2018 power prices, partially offset by the reversal of previously recognized unrealized losses from electricity contracts that settled during the period. The $5 million gain in operating costs and expenses from economic hedge positions was primarily driven by an increase in the value of forward purchases of fuel contracts as a result of increases in 2017 coal prices, as well as the reversal of previously recognized unrealized losses from contracts that settled during the period.

For the three months ended September 30, 2016, the $83 million loss in operating revenues from economic hedge positions was primarily driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period as well as a decrease in the value of forward purchases of natural gas contracts as a result of decreases in natural gas prices. The $40 million gain in operating costs and expenses from economic hedge positions was primarily driven by an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices, as well as the reversal of previously recognized unrealized losses from coal contracts that settled during the period.

For the nine months ended September 30, 2017, the $2 million loss in operating revenues from economic hedge positions was primarily driven by the reversal of previously recognized unrealized gains from electricity contracts that settled during the period, largely offset by an increase in the value of forward sales of power contracts as a result of decreases in power prices. The zero impact to operating costs and expenses from economic hedge positions was driven by the reversal of previously recognized unrealized losses from contracts that settled during the period, completely offset by a decrease in the value of forward purchases of fuel contracts as a result of decreases in forward coal prices.

For the nine months ended September 30, 2016, the $203 million loss in operating revenues from economic hedge positions was primarily driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period. The $39 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from coal contracts that settled during the period, partially offset by decreases in value of new coal contracts executed during the year.

69

Operations and Maintenance

Operations and maintenance decreased by $4 million for the three months ended September 30, 2017, compared to the same period in 2016 primarily due to lower operating and maintenance costs driven by a decrease in unplanned maintenance expense as well as lower variable operating costs due to lower generation.

Operations and maintenance decreased by $38 million for the nine months ended September 30, 2017, compared to the same period in 2016 primarily due to a decrease in environmental expenses for Maryland Ash compared to the prior year along with lower operating and maintenance costs driven by a decrease in planned and unplanned maintenance expense as well as lower variable operating costs due to lower generation.

Other Cost of Operations

Other cost of operations increased by $8 million for the three months ended September 30, 2017, compared to the same period in 2016 primarily due to favorable property tax settlements received in the third quarter of 2016 for Chalk Point and Dickerson.

Other cost of operations increased by $14 million for the nine months ended September 30, 2017, compared to the same period in 2016 primarily due to favorable property tax settlements received in the first and third quarters of 2016 for Chalk Point and Dickerson.

General and Administrative Expenses

General and administrative expenses increased by $6 million during the three and nine months ended September 30, 2017 compared to the same periods in 2016 due to increased professional fees for legal matters.

General and Administrative Expenses - Affiliate

General and administrative expenses - affiliate decreased by $11 million during the three months ended September 30, 2017 and decreased by $3 million during the nine months ended September 30, 2017 compared to the same periods in 2016, primarily due to a decrease in the amended shared service fee during the pendency of Chapter 11 Cases as further described in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q.

Income Tax Expense/(Benefit)

GenOn Mid-Atlantic is not subject to income taxes as it is a disregarded entity for tax purposes.

For the three and nine months ended September 30, 2017 and 2016, GenOn Mid-Atlantic was not allocated income taxes attributable to its operations on a pro forma income tax provision basis.

70

Liquidity and Capital Resources

Liquidity Position

As of September 30, 2017 and December 31, 2016, the Registrants' liquidity was comprised of the following:

	September 30, 2017		December 31, 2016
	(In millions)
Cash and cash equivalents:
GenOn excluding GenOn Mid-Atlantic and REMA	$	576	$	463
GenOn Mid-Atlantic (a)	175		471
REMA (a)	59		100
Restricted cash	1		—
Total	811		1,034
Credit facility availability (b)	294		228
Total liquidity	$	1,105	$	1,262

(a) At September 30, 2017, REMA and GenOn Mid-Atlantic did not satisfy the restricted payment tests under certain of their agreements and therefore, could not use such funds to distribute cash and make other restricted payments.

(b) Includes the $300 million cash collateralized letter of credit facility that GenOn obtained from a third party financial institution on July 14, 2017.

For the nine months endedSeptember 30, 2017, total liquidity decreased$157 million. Changes in cash and cash equivalents balances are further discussed hereinafter under the heading CashFlow Discussion. Also, in July 2017, GenOn opened an exchange clearing account with a third party financial institution and posted $20 million of initial margin.

As further described in Note 1, Basis of Presentation, to the Condensed Consolidated Financial Statements of this Form 10-Q, management believes that the Registrants' liquidity position, cash flows from operations and uncertainty as to the outcome of the Chapter 11 Cases, provide substantial doubt about GenOn's and GenOn Americas Generation's ability to continue as a going concern, including its ability to finance current operating, maintenance and capital expenditures, debt service obligations and other liquidity commitments.

The filing of the Chapter 11 Cases constitutes an event of default under the Debt Documents. As the result, all outstanding indebtedness under the Debt Documents has become or may be declared due and payable. Any efforts to enforce such payment obligations under the Debt Documents were automatically stayed as a result of the commencement of the Chapter 11 Cases and the holders' rights of enforcement in respect of the Debt Documents are subject to the applicable provisions of the Bankruptcy Code.

During the pendency of the Chapter 11 Cases, GenOn expects that its primary sources of liquidity will continue to be cash on hand, cash flows from operations, and the letter of credit facility.

In addition to the cash requirements necessary to fund ongoing operations, GenOn has incurred and continues to incur significant professional fees and other costs in connection with the preparation and handling of its Chapter 11 Cases. GenOn anticipates that it will continue to incur significant professional fees and costs during the pendency of its Chapter 11 Cases.

Although GenOn believes its cash on hand, cash flow from operating activities and letter of credit facility up to the time when it emerges from bankruptcy will be adequate to meet the short-term liquidity requirements of its existing business, GenOn cannot assure that such amounts will be sufficient to fund its operations. GenOn's long-term liquidity requirements and the adequacy of its capital resources are difficult to predict at this time.

For further discussion of liquidity risks and risks associated with the Chapter 11 Cases, see Item 1A, Risk Factors.

As described above and in Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q, GenOn Energy, Inc. and GenOn Americas Generation have submitted the Plan in connection with their Chapter 11 Cases. There is no assurance that such Plan will be approved by the requisite stakeholders, confirmed by the Bankruptcy Court, or successfully implemented thereafter. GenOn's and GenOn Americas Generation’s ability to continue as a going concern is dependent on many factors, including the successful confirmation of the Plan and emergence from bankruptcy. Given the uncertainty as to the outcome of these factors, there is substantial doubt about GenOn's and GenOn Americas Generation's ability to continue as a going concern.

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With respect to GenOn Mid-Atlantic, a consolidated subsidiary of GenOn, management has determined that while it has sufficient cash on hand to fund current obligations including operating lease payments due under the GenOn Mid-Atlantic operating leases as of September 30, 2017, the potential significant adverse impact of financial stresses at GenOn Mid-Atlantic's parent companies and any adverse impact resulting from the notification by GenOn Mid-Atlantic's lessors alleging the existence of lease events of default as further described in Note 8, Debt and Capital Leases to the Condensed Consolidated Financial Statements of this Form 10-Q, has caused there to be substantial doubt about GenOn Mid-Atlantic's ability to continue as a going concern.

Restricted Payments Tests

Of the $810 million of cash and cash equivalents of the Registrants' as of September 30, 2017, $175 million and $59 million were held by GenOn Mid-Atlantic and REMA, respectively. The ability of certain of GenOn’s and GenOn Americas Generation’s subsidiaries to pay dividends and make distributions is restricted under the terms of certain agreements, including the GenOn Mid-Atlantic and REMA operating leases.  Under their respective operating leases, GenOn Mid-Atlantic and REMA are not permitted to make any distributions and other restricted payments unless:  (a) they satisfy the fixed charge coverage ratio for the most recently ended period of four fiscal quarters; (b) they are projected to satisfy the fixed charge coverage ratio for each of the two following periods of four fiscal quarters, commencing with the fiscal quarter in which such payment is proposed to be made; and (c) no significant lease default or event of default has occurred and is continuing.  In addition, prior to making a dividend or other restricted payment, GenOn Mid-Atlantic and REMA must be in compliance with the requirement to provide credit support to the owner lessors securing their obligations to pay scheduled rent under their respective leases.  Based on GenOn Mid-Atlantic’s and REMA’s most recent calculations of these tests, GenOn Mid-Atlantic and REMA did not satisfy the restricted payments tests. As a result, as of September 30, 2017, GenOn Mid-Atlantic and REMA could not make distributions of cash and certain other restricted payments.  Each of GenOn Mid-Atlantic and REMA may recalculate its fixed charge coverage ratios from time to time and, subject to compliance with the restricted payments test described above, make dividends or other restricted payments. GenOn Mid-Atlantic has not been able to make distributions of cash and certain other restricted payments since the quarter ended March 31, 2014 which was the last quarterly period for which GenOn Mid-Atlantic satisfied the conditions under its operating agreement. REMA has not satisfied the conditions under its operating agreement to make distributions of cash and certain other restricted payments since 2009.

Sources of Liquidity

The principal sources of liquidity for the Registrants' future operating and capital expenditures are expected to be derived from existing cash on hand, cash flows from operations, cash proceeds from future sales of assets and the letter of credit facility. The Registrants' operating cash flows may be affected by, among other things, demand for electricity, the difference between the cost of fuel used to generate electricity and the market value of the electricity generated, commodity prices (including prices for electricity, emissions allowances, natural gas, coal and oil), operations and maintenance expenses in the ordinary course, planned and unplanned outages, terms with trade creditors, cash requirements for capital expenditures relating to certain facilities (including those necessary to comply with environmental regulations) and the potential impact of future environmental regulations.

Uses of Liquidity

The Registrants' requirements for liquidity and capital resources, other than for operating its facilities, can generally be categorized by the following: (i) debt service obligations; (ii) capital expenditures, including maintenance and environmental; and (iii) payments under the GenOn Mid-Atlantic and REMA operating leases. Pursuant to Section 362 of the Bankruptcy Code, the filing of the Chapter 11 Cases automatically stayed GenOn's and GenOn Americas Generation's debt service obligations and the holders' rights of enforcement are subject to the applicable provisions of the Bankruptcy Code.

GenOn Mid-Atlantic Long-Term Deposits

On January 27, 2017, GenOn Mid-Atlantic entered into an agreement with Natixis Funding Corp., or Natixis, under which Natixis will procure payment and credit support for the payment of certain lease payments owed pursuant to the GenOn Mid-Atlantic operating leases for Morgantown and Dickerson, or the Natixis Agreement. GenOn Mid-Atlantic made a payment of $130 million plus fees of $1 million as consideration for Natixis applying for the issuance of, and obtaining, letters of credit from Natixis, New York Branch, the LC Provider, to support the lease payments. Natixis is solely responsible for (i) obtaining letters of credit from the LC Provider, (ii) causing the letters of credit to be issued to the lessors to support the lease payments on behalf of GenOn Mid-Atlantic, (iii) making lease payments and (iv) satisfying any reimbursement obligations payable to the LC Provider. The payment was accounted for as a long-term deposit on the Registrants' consolidated balance sheets prior to June 30, 2017, reflecting the deferred benefit to GenOn Mid-Atlantic of its contractual rights under the Natixis Agreement, including lease payments Natixis has agreed to make thereunder, and notwithstanding that GenOn Mid-Atlantic had made an irrevocable payment to Natixis.

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In letters dated February 24, 2017, GenOn Mid-Atlantic received a series of notices from certain of the owner lessors under its operating leases of the Morgantown coal generation units, or Notices, alleging default. The Notices allege the existence of lease events of default as a result of, among other items, the purported failure by GenOn Mid-Atlantic to comply with a covenant requiring the maintenance of qualifying credit support. The Notices instructed the relevant trustees to draw on letters of credit under the secured intercompany revolving credit agreement between NRG and GenOn as further described in Note 10, Related Party Transactions to the Condensed Consolidated Financial Statements of this Form 10-Q, to support the GenOn Mid-Atlantic operating leases that were set to expire on February 28, 2017. On February 28, 2017, the trustees drew on the letters of credit under NRG's revolving credit facility, which resulted in borrowings of $125 million. Upon notification, GenOn became obligated under the Intercompany Revolver. In addition, a corresponding payable was recorded by GenOn Mid-Atlantic to GenOn, with the offset recorded as a long-term deposit on the Registrants' consolidated balance sheets as of March 31, 2017 under the related operating leases. GenOn requested GenOn Mid-Atlantic repay the related amount borrowed under the Intercompany Revolver. On May 5, 2017, GenOn Mid-Atlantic repaid $125 million to GenOn.

GenOn Mid-Atlantic disagrees with the owner lessors as to the existence of any lease events of default and/or any breaches by GenOn Mid-Atlantic of any terms and conditions of the operating leases and believes that the declaration of a lease event of default, the instruction to draw on the letters of credit, and the draws thereon constituted a violation by the owner lessors and the relevant trustees of the terms and conditions of the GenOn Mid-Atlantic operating leases. GenOn Mid‑Atlantic has been vigorously pursuing its rights and remedies in connection with these actions. On March 7, 2017, GenOn Mid-Atlantic filed a complaint in the Supreme Court for the State of New York against the owner lessors of the Morgantown and Dickerson facilities and U.S. Bank, N.A., or U.S. Bank, in its capacity as the indenture trustee, the GenOn Mid-Atlantic Complaint. The GenOn Mid-Atlantic Complaint seeks, inter alia, a declaratory judgment that no lease events of default exist and asserts counts for breach of contract, conversion, tortious interference, breach of the implied covenant of good faith and fair dealing, unjust enrichment, constructive trust, and injunctive relief. On June 8, 2017, the owner lessors filed a complaint in the Supreme Court for the State of New York against GenOn Mid‑Atlantic and certain of its affiliates, including GenOn and NRG, the Owner Lessor Complaint. The Owner Lessor Complaint asserts ten counts for various fraudulent transfer, contract, and other claims and seeks hundreds of millions of dollars in damages.

On June 28, 2017, GenOn Mid-Atlantic directed U.S. Bank in its capacity as the indenture trustee, to apply the $125 million that had been drawn on the letters of credit under NRG's revolving credit facility to the June 30 rent obligations related to the operating leases. In addition, GenOn Mid‑Atlantic paid $2.7 million to the owner lessors, which, together with the $125 million, would satisfy the June 30 rent obligations. The owner lessors notified U.S. Bank that the $125 million was to be held pending the outcome of the GenOn Mid-Atlantic Complaint, and that GenOn Mid‑Atlantic must instead satisfy its rent obligations solely from available cash. In response, GenOn Mid-Atlantic again directed U.S. Bank to apply the same $125 million to the June 30 rent obligations. On June 30, 2017, U.S. Bank drew on the Natixis Agreement in the amount of $125 million in order to satisfy the remaining June 30 rent obligation. At such time, GenOn Mid-Atlantic transferred $125 million of the amount paid under the Natixis Agreement to prepaid rent - non-current in its consolidated balance sheet. GenOn Mid-Atlantic disputes that the draw on the Natixis Agreement was proper. The owner lessors dispute that the June 30 rent obligations were satisfied, stating that they have only received the $2.7 million.

On July 6 and 7, 2017, GenOn Mid-Atlantic received notices from certain owner lessors under its operating leases of the Dickerson coal generation units, or the Dickerson Notices. The Dickerson Notices allege the existence of lease events of default as a result of, among other items, the purported failure by GenOn Mid-Atlantic to comply with a covenant requiring the maintenance of qualifying credit support. GenOn Mid-Atlantic disputes that there is a lease event of default related to the Natixis Agreement. On July 31, 2017, and pursuant to an agreement reached between GenOn Mid-Atlantic, the owner lessors and certain holders of pass-through certificates, the proceeds of the draw on the Natixis Agreement were applied by the trustee to the June 30 rent payment and distributed to the holders of the pass through certificates of the Morgantown facility pursuant to the waterfall applicable in a “no default” scenario.

GenOn Mid-Atlantic entered into a limited waiver agreement with U.S. Bank as lease indenture trustee and pass through trustee, the owner lessors, the owner participants and certain consenting certificateholders under the Morgantown operating leases, pursuant to which all such parties agreed to waive the requirement that GenOn Mid-Atlantic reinstate the availability of any drawn qualifying credit support under any lease agreement for the Morgantown coal generation unit. The limited waiver agreement became effective on September 30, 2017 and will remain in effect until the earlier of (i) November 22, 2017 and (ii) 10 business days after a decision or order is issued in the Debtors’ Motion to Estimate the Owner Lessor Plaintiffs’ Claims and Expedited Motion to Establish Related Schedule [Docket No. 128], pending in the Chapter 11 Cases of the GenOn Entities in the United States Bankruptcy Court for the Southern District of Texas, jointly administered under the lead case caption In re GenOn Energy, Inc., Case No. 17-33695 (DRJ).

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In connection with the letters of credit issued pursuant to the Natixis Agreement, the LC Provider delivered notices of termination, dated October 26, 2017, of its intent to terminate such letters of credit as of December 27, 2017. Pursuant to the operative documents governing the leases of the Morgantown and Dickerson coal generation units and the letters of credit, the issuer of the letters of credit may terminate such letters of credit by providing 60 days prior written notice to the holders thereof, among other parties. Pursuant to the same operative documents, GenOn Mid-Atlantic must provide alternative qualifying credit support no later than 30 days prior to the intended termination date of the letters of credit subject to termination. GenOn Mid-Atlantic intends to vigorously pursue all rights and claims available to it against any person in connection with the termination of the letters of credit by the LC Provider and the resulting replacement of qualifying credit support.

Capital Expenditures

The following table and description summarizes the Registrants' capital expenditures for maintenance, environmental, and fuel conversions/additions for the nine months ended September 30, 2017 and currently estimated capital expenditures forecast for the remainder of 2017.

	Maintenance		Environmental		Fuel conversions/additions		Total
	(In millions)
Total cash capital expenditures for the nine months ended September 30, 2017
GenOn	$	43	$	15	$	11	$	69
GenOn Americas Generation	24		9		—		33
GenOn Mid-Atlantic	21		9		—		30
Estimated capital expenditures for the remainder of 2017
GenOn	26		1		—		27
GenOn Americas Generation	6		1		—		7
GenOn Mid-Atlantic	7		1		—		8

Environmental Capital Expenditures

GenOn estimates that environmental capital expenditures from 2017 through 2021 required to comply with environmental laws will be approximately $27 million for GenOn, which includes $12 million for GenOn Americas Generation. The estimate for GenOn Americas Generation includes $12 million for GenOn Mid-Atlantic.

Operating Leases

GenOn, through its subsidiary REMA, leases a 100% interest in the Shawville generating station through 2026 and leases 16.67% and 16.45% interests in the Keystone and Conemaugh coal generation stations, respectively, through 2034. In addition, GenOn Mid-Atlantic leases a 100% interest in the Dickerson and Morgantown coal generation stations and associated property through 2029 and 2034, respectively. GenOn and GenOn Mid-Atlantic account for these leases as operating leases and records rent lease expense on a straight-line basis over the term of each respective lease. Annual rent expense for the REMA and GenOn Mid-Atlantic operating leases is $40 million and $71 million, respectively. As a result of acquisition accounting, REMA and GenOn Mid-Atlantic recognized out-of-market liabilities related to these operating leases of $790 million, which is being amortized on a straight-line basis to rent expense. Amortization of the out-of-market liabilities amortized annually by REMA and GenOn Mid-Atlantic is $11 million and $28 million, respectively. As of September 30, 2017, the termination value of the GenOn Mid-Atlantic operating leases was $834 million, and as of September 30, 2017, the termination value of the REMA operating leases was $577 million. See above for further information regarding the status of the GenOn Mid-Atlantic leases and related payments.

The following table and description summarizes the payments made under REMA and GenOn Mid-Atlantic's operating leases for the nine months ended September 30, 2017 and the future payments for the remaining term of the respective lease agreements.

	Nine months ended September 30, 2017		Remainder of 2017		2018		2019		2020		2021		Thereafter		Total
	(In millions)
REMA	$	63	$	—	$	55	$	65	$	56	$	47	$	231	$	517
GenOn Mid-Atlantic	128		16		105		139		105		42		400		935
Total Minimum Lease Payment	$	191	$	16	$	160	$	204	$	161	$	89	$	631	$	1,452

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Cash Flow Discussion

The following table reflects the changes in cash flows for the comparative nine month periods:

GenOn

	Nine months ended September 30,
	2017			2016			Change
	(In millions)
Net cash (used)/provided by operating activities	$	(53	)	$	190		$	(243	)
Net cash (used)/provided by investing activities	(69		)	326			(395		)
Net cash used by financing activities	(101		)	(4		)	(97		)

Net Cash (Used)/Provided By Operating Activities

Changes to net cash (used)/provided by operating activities were driven by:

	(In millions)
Decrease in operating income adjusted for non-cash items	$	(257	)
Change in cash collateral in support of risk management activities	172
Proceeds from sale of emissions allowances in 2016	(36		)
Changes in fuel inventory to meet commodity and transportation obligations	(80		)
Other changes in working capital primarily related to prepaid rent	(42		)
	$	(243	)

Net Cash (Used)/Provided By Investing Activities

Changes to net cash (used)/provided by investing activities were driven by:

	(In millions)
Decrease in capital expenditures primarily due to the completion of gas addition projects at Shawville and New Castle, as well as fewer planned outages across the fleet	$	170
Proceeds from sale of assets in 2016	(563		)
Other	(2		)
	$	(395	)

Net Cash Used By Financing Activities

Changes to net cash used by financing activities were driven by:

	(In millions)
Payment for credit support	$	(130	)
Proceeds from draw on intercompany secured revolving credit facility	125
Payments for financing costs primarily related to the 2022 Notes and the Backstop Fee	(94		)
Decrease in payments for current and long-term debt	2
	$	(97	)

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GenOn Americas Generation

	Nine months ended September 30,
	2017			2016		Change
	(In millions)
Net cash provided by operating activities	$	10		$	153	$	(143	)
Net cash (used)/provided by investing activities	(36		)	32		(68		)
Net cash used by financing activities	(271		)	—		(271		)

Net Cash Provided By Operating Activities

Changes to net cash provided by operating activities were driven by:

	(In millions)
Decrease in operating income adjusted for non-cash items	$	(258	)
Change in cash collateral in support of risk management activities	179
Changes in fuel inventory to meet commodity and transportation obligations	(62		)
Other changes in working capital	(2		)
	$	(143	)

Net Cash (Used)/Provided By Investing Activities

Changes to net cash (used)/provided by investing activities were driven by:

	(In millions)
Decrease in capital expenditures for maintenance	$	11
Proceeds from sale of assets in 2016	(76		)
Increase in notes receivable - affiliate with GenOn Energy Holdings	(3		)
	$	(68	)

Net Cash Used By Financing Activities

Changes to net cash used by financing activities were driven by:

	(In millions)
Payment for credit support	$	(130	)
Payment for amounts due to GenOn Energy, Inc.	(125		)
Payments for financing costs primarily related to the Backstop Fee	(16		)
	$	(271	)

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GenOn Mid-Atlantic

	Nine months ended September 30,
	2017			2016			Change
	(In millions)
Net cash (used)/provided by operating activities	$	(10	)	$	224		$	(234	)
Net cash used by investing activities	(30		)	(40		)	10
Net cash used by financing activities	(256		)	—			(256		)

Net Cash (Used)/Provided By Operating Activities

Changes in net cash (used)/provided by operating activities were driven by:

	(In millions)
Decrease in operating income adjusted for non-cash items	$	(242	)
Changes in fuel inventory to meet commodity and transportation obligations	(63		)
Other changes in working capital primarily related to prepaid rent	71
	$	(234	)

Net Cash Used By Investing Activities

Changes to net cash used by investing activities were driven by capital expenditures.

Net Cash Used By Financing Activities

Changes to net cash used by financing activities were primarily driven by $130 million payment for credit support and $125 million payment for amounts due to GenOn Energy, Inc.

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NOLs, Deferred Tax Assets and Uncertain Tax Position Implications, under ASC 740

GenOn

For the nine months ended September 30, 2017, GenOn had total domestic pre-tax book income of $49 million. GenOn had cumulative domestic NOLs consisting of carryforwards for federal income tax purposes of $1.3 billion and state of $2.7 billion as of December 31, 2016. GenOn's pre-merger federal NOLs are limited to $62 million annually. GenOn’s net federal NOLs will begin to expire starting in 2032.

As of December 31, 2016, GenOn recorded a net deferred tax asset of $2.1 billion relating primarily to federal and state loss carryforwards, out-of-market contracts and differences between book and tax basis of property, plant and equipment. Based on its assessment of positive and negative evidence, including available tax planning strategies, GenOn believes that it is more likely than not that a benefit will not be realized on the $2.1 billion tax asset as of December 31, 2016, thus a valuation allowance has been recorded. GenOn’s tax effected valuation allowance was $2.1 billion as of December 31, 2016.

As of September 30, 2017, GenOn does not have any uncertain tax benefits.

GenOn is no longer subject to U.S. federal income tax examinations for years prior to 2015, and with few exceptions, state and local tax examinations are no longer open for years prior to 2010.

GenOn Americas Generation

For the nine months ended September 30, 2017, GenOn Americas Generation had total domestic pre-tax book income of $48 million. As of December 31, 2016, GenOn Americas Generation had no cumulative NOL carryforwards available.

As of December 31, 2016, GenOn Americas Generation recorded a net deferred tax asset of $822 million relating primarily to differences between book and tax basis of property, plant and equipment and out-of-market contracts. Based on its assessment of positive and negative evidence, including available tax planning strategies, GenOn Americas Generation believes that it is more likely than not that a benefit will not be realized on the $822 million tax asset as of December 31, 2016, thus a valuation allowance has been recorded. GenOn Americas Generation’s tax effected valuation allowance was $822 million as of December 31, 2016.

As of September 30, 2017, GenOn Americas Generation does not have any uncertain tax benefits.

GenOn Mid-Atlantic

For the nine months ended September 30, 2017, GenOn Mid-Atlantic had a total domestic pre-tax book loss of $33 million. As of December 31, 2016, GenOn Mid-Atlantic had no cumulative NOL carryforwards available.

As of December 31, 2016, GenOn Mid-Atlantic recorded a net deferred tax asset of $648 million relating primarily to differences between book and tax basis of property, plant and equipment. Based on its assessment of positive and negative evidence, including available tax planning strategies, GenOn Mid-Atlantic believes that it is more likely than not that a benefit will not be realized on the $648 million tax asset as of December 31, 2016, thus a valuation allowance has been recorded. GenOn Mid-Atlantic’s tax effected valuation allowance was $648 million as of December 31, 2016.

As of September 30, 2017, GenOn Mid-Atlantic does not have any uncertain tax benefits.

Off-Balance Sheet Arrangements

Obligations under Certain Guarantee Contracts

The Registrants and certain of their subsidiaries enter into guarantee arrangements in the normal course of business to facilitate commercial transactions with third parties. These arrangements include financial and performance guarantees, stand-by letters of credit, debt guarantees, surety bonds and indemnifications.

Retained or Contingent Interests

The Registrants do not have any material retained or contingent interests in assets transferred to an unconsolidated entity.

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Contractual Obligations and Commercial Commitments

The Registrants have a variety of contractual obligations and other commercial commitments that represent prospective cash requirements in addition to the Registrants' capital expenditure programs. These are disclosed in the following tables and in the Registrants' 2016 Form 10-K in Note 9, Debt and Capital Leases, Note 11, Benefit Plans and Other Postretirement Benefits, and Note 14, Commitment and Contingencies. See also Note 3, Chapter 11 Cases, Note 8, Debt and Capital Leases, and Note 11, Commitments and Contingencies, to this Form 10-Q for discussion of new commitments and contingencies that also include contractual obligations and commercial commitments that occurred during the three and nine months ended September 30, 2017.

GenOn

	By Remaining Maturity at September 30,
	2017
Guarantees	Under 1 Year		1-3 Years		3-5 Years		Over 5 Years		Total
	(In millions)
Letters of credit and surety bonds	$	154	$	24	$	—	$	—	$	178
Other guarantees	—		365		—		158		523
Total guarantees	$	154	$	389	$	—	$	158	$	701

GenOn Americas Generation

	By Remaining Maturity at September 30,
	2017
Guarantees	Under 1 Year		1-3 Years		3-5 Years		Over 5 Years		Total
	(In millions)
Letters of credit and surety bonds	$	17	$	6	$	—	$	—	$	23
Total guarantees	$	17	$	6	$	—	$	—	$	23

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Fair Value of Derivative Instruments

The Registrants may enter into power sales contracts, fuel purchase contracts and other energy-related financial instruments to mitigate variability in earnings due to fluctuations in spot market prices and to hedge fuel requirements at generation facilities.

The tables below disclose the activities that include both exchange and non-exchange traded contracts accounted for at fair value in accordance with ASC 820, Fair Value Measurements and Disclosures, or ASC 820. Specifically, these tables disaggregate realized and unrealized changes in fair value; disaggregate estimated fair values at September 30, 2017, based on their level within the fair value hierarchy defined in ASC 820; and indicate the maturities of contracts at September 30, 2017.

GenOn

Derivative Activity Gains	(In millions)
Fair Value of Contracts as of December 31, 2016	$	2
Contracts realized or otherwise settled during the period	7
Changes in fair value	6
Fair Value of Contracts as of September 30, 2017	$	15

	Fair Value of Contracts as of September 30, 2017
	Maturity
Fair value hierarchy Gains/(Losses)	1 Year or Less			Greater than 1 Year to 3 Years		Greater than 3 Years to 5 Years		Greater than 5 Years		Total Fair Value
	(In millions)
Level 2	$	9		$	11	$	—	$	—	$	20
Level 3	(5		)	—		—		—		(5		)
Total	$	4		$	11	$	—	$	—	$	15

GenOn Americas Generation

Derivative Activity (Losses)/Gains	(In millions)
Fair Value of Contracts as of December 31, 2016	$	(3	)
Contracts realized or otherwise settled during the period	3
Fair Value of Contracts as of September 30, 2017	$	—

	Fair Value of Contracts as of September 30, 2017
	Maturity
Fair value hierarchy (Losses)/Gains	1 Year or Less			Greater than 1 Year to 3 Years		Greater than 3 Years to 5 Years		Greater than 5 Years		Total Fair Value
	(In millions)
Level 2	$	(1	)	$	2	$	—	$	—	$	1
Level 3	(1		)	—		—		—		(1		)
Total	$	(2	)	$	2	$	—	$	—	$	—

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GenOn Mid-Atlantic

Derivative Activity Gains/(Losses)	(In millions)
Fair Value of Contracts as of December 31, 2016	$	2
Contracts realized or otherwise settled during the period	(3		)
Changes in fair value	(1		)
Fair Value of Contracts as of September 30, 2017	$	(2	)

	Fair Value of Contracts as of September 30, 2017
	Maturity
Fair value hierarchy (Losses)/Gains	1 Year or Less			Greater than 1 Year to 3 Years		Greater than 3 Years to 5 Years		Greater than 5 Years		Total Fair Value
	(In millions)
Level 2	$	(3	)	$	2	$	—	$	—	$	(1	)
Level 3	(1		)	—		—		—		(1		)
Total	$	(4	)	$	2	$	—	$	—	$	(2	)

The Registrants have elected to present derivative assets and liabilities on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. Also, collateral received or paid on the Registrants' derivative assets or liabilities are recorded on a separate line item on the balance sheet. Consequently, the magnitude of the changes in individual current and non-current derivative assets or liabilities is higher than the underlying credit and market risk of the Registrants' portfolio. As the Registrants' trade-by-trade derivative accounting results in a gross-up of their derivative assets and liabilities, the net derivative asset and liability position is a better indicator of Registrants' hedging activity. As of September 30, 2017, GenOn had a net derivative asset balance of $15 million and GenOn Americas Generation had no net derivative balance, which are increases to total fair value of $13 million and $3 million, respectively, as compared to December 31, 2016. These increases were primarily driven by the roll-off of trades that settled during the period, as well as gains in fair value. As of September 30, 2017, GenOn Mid-Atlantic had a net derivative liability balance of $2 million, which is a decrease to total fair value of $4 million, as compared to December 31, 2016. This decrease was primarily driven by the roll-off of trades that settled during the period, as well as losses in fair value.

Based on a sensitivity analysis using simplified assumptions, the impact of a $0.50 per MMBtu increase in natural gas prices across the term of the GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic derivative contracts would result in a decrease of approximately $31 million, $13 million, and $13 million, respectively, in the net value of derivatives as of September 30, 2017. The impact of a $0.50 per MMBtu decrease in natural gas prices across the term of the GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic derivative contracts would result in an increase of approximately $31 million, $13 million, $13 million, respectively, in the net value of derivatives as of September 30, 2017.

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Critical Accounting Policies and Estimates

The Registrants' discussion and analysis of the financial condition and results of operations are based upon the Consolidated Financial Statements, which have been prepared in accordance with GAAP. The preparation of these financial statements and related disclosures in compliance with GAAP requires the application of appropriate technical accounting rules and guidance as well as the use of estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures of contingent assets and liabilities. The application of these policies involves judgments regarding future events, including the likelihood of success of particular projects, legal and regulatory challenges, and the fair value of certain assets and liabilities. These judgments, in and of themselves, could materially affect the financial statements and disclosures based on varying assumptions, which may be appropriate to use. In addition, the financial and operating environment may also have a significant effect, not only on the operation of the business, but on the results reported through the application of accounting measures used in preparing the financial statements and related disclosures, even if the nature of the accounting policies have not changed.

On an ongoing basis, the Registrants evaluate these estimates, utilizing historic experience, consultation with experts and other methods the Registrants consider reasonable. In any event, actual results may differ substantially from the Registrants’ estimates. Any effects on the Registrants’ business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the information that gives rise to the revision becomes known.

The Registrants’ significant accounting policies are summarized in the 2016 Form 10-K, Item 15 - Note 2, Summary of Significant Accounting Policies, to the consolidated financial statements. The Registrants identify their most critical accounting policies as those that are the most pervasive and important to the portrayal of their financial position and results of operations, and that require the most difficult, subjective and/or complex judgments by management regarding estimates about matters that are inherently uncertain.

Accounting Policy	Judgments/Uncertainties Affecting Application
Derivative Instruments	Assumptions used in valuation techniques
	Assumptions used in forecasting generation
	Market maturity and economic conditions
	Contract interpretation
	Market conditions in the energy industry, especially the effects of price volatility on contractual commitments
Impairment of Long-Lived Assets	Recoverability of investment through future operations
	Regulatory and political environments and requirements
	Estimated useful lives of assets
	Environmental obligations and operational limitations
	Estimates of future cash flows
	Estimates of fair value
	Judgment about impairment triggering events
Income Taxes and Valuation Allowance for Deferred Tax Assets	Ability to be sustained upon audit examination of taxing authorities
	Interpret existing tax statute and regulations upon application to transactions
	Ability to utilize tax benefits through carry backs to prior periods and carry forwards to future periods

A detailed description of the most difficult, subjective and/or complex judgments by the Registrants’ management with respect to Derivative Instruments is included in Note 4, Fair Value of Financial Instruments, to the Registrants’ 2016 Form 10-K and a detail description of the most difficult, subjective and/or complex judgments by the Registrants’ management with respect to Impairment of Long-Lived Assets is included in Note 8, Impairments, to the Registrants’ 2016 Form 10-K. A detailed description of the most difficult, subjective and/or complex judgments by the Registrants’ management with respect to Income Taxes and Valuation Allowance for Deferred Tax Assets is included in Note 12, Income Taxes, to the Registrants’ 2016 Form 10-K.

82

The Registrants test their long-lived assets for impairment whenever indicators of impairment exist. The Registrants' annual budget is utilized to determine the cash flows associated with the Registrants' long-lived assets, which incorporates various assumptions, including the Registrants' long-term view of natural gas prices and its impact on merchant power prices and fuel costs, as well as various state and federal subsidies and federal, regional and state environmental compliance costs. The Registrants' annual budget process is finalized and approved by the Board of Directors in the fourth quarter. It is reasonably possible that the updated long term cash flows will not support the carrying value of certain assets, and the Registrants will be required to test such assets for impairment. Additionally, continued decreases in power prices could also result in an adverse change in the manner that long-lived assets are used, or result in the Registrants selling an asset before the end of its previously estimated useful life, at a price that is lower than its carrying amount. During the preparation of the budget, the Registrants noted that management’s view of long term merchant power prices has decreased, and accordingly, it is reasonably possible that certain of the Registrants' long-lived assets will be significantly impaired during the fourth quarter of 2017.

83

ITEM 3 — QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

The Registrants are exposed to several market risks in their normal business activities. Market risk is the potential loss that may result from market changes associated with the Registrants' merchant power generation or with an existing or forecasted financial or commodity transaction. The types of market risks the Registrants are exposed to are commodity price risk, interest rate risk, and credit and performance risk. The following disclosures about market risk provide an update to, and should be read in conjunction with, Item 7A — Quantitative and Qualitative Disclosures About Market Risk, of the Registrants' 2016 Form 10-K.

Credit Risk

Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. The Registrants are exposed to counterparty credit risk through various activities including wholesale sales and fuel purchases. See Note 5, Fair Value of Financial Instruments, to this Form 10-Q for discussions regarding counterparty credit risk and retail customer credit risk, and Note 6, Accounting for Derivative Instruments and Hedging Activities, to this Form 10-Q for discussion regarding credit risk contingent features.

84

ITEM 4 — CONTROLS AND PROCEDURES (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of the Registrants’ management, including the principal executive officer, principal financial officer and principal accounting officer, the Registrants conducted an evaluation of the effectiveness of the design and operation of disclosure controls and procedures, as such term is defined in Rules 13a-15(e) or 15d-15(e) of the Exchange Act. Based on this evaluation, the Registrants’ principal executive officer, principal financial officer and principal accounting officer concluded that the disclosure controls and procedures were effective as of the end of the period covered by this Quarterly Report on Form 10-Q.

Changes in Internal Control over Financial Reporting

There were no changes in the Registrants’ internal control over financial reporting (as such term is defined in Rule 13a-15(f) under the Exchange Act) that occurred in the third quarter of 2017 that materially affected, or are reasonably likely to materially affect, the Registrants’ internal control over financial reporting.

85

PART II

OTHER INFORMATION

Item 1 — LEGAL PROCEEDINGS (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

On June 14, 2017, the GenOn Entities filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code in the Bankruptcy Court. As a result of such bankruptcy filings, substantially all proceedings pending against the GenOn entities have been stayed by operation of Section 362(a) of the Bankruptcy Code. For more information, see Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q. For a discussion of additional material legal proceedings in which the Registrants were involved through September 30, 2017, see Note 11, Commitments and Contingencies, to the Condensed Consolidated Financial Statements of this Form 10-Q.

Item 1A — RISK FACTORS (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Information regarding risk factors appears in Part I, Item 1A, Risk Factors, in the Registrants' 2016 Form 10-K and Part II, Item 1A in the Registrants' Form 10-Q for the quarter ended June 30, 2017. There have been no material changes in the Registrants' risk factors since those reported in the Registrants' 2016 Form 10-K and the Registrants' Form 10-Q for the quarter ended June 30, 2017.

Item 2 — UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

None.

Item 3 — DEFAULTS UPON SENIOR SECURITIES (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

See Note 3, Chapter 11 Cases, to the Condensed Consolidated Financial Statements of this Form 10-Q, for a description of events of default by GenOn and GenOn Americas Generation under the GenOn Senior Notes and the GenOn Americas Generation Senior Notes.

Item 4 — MINE SAFETY DISCLOSURES (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Not applicable.

Item 5 — OTHER INFORMATION(GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

None.

86

Item 6 — EXHIBITS(GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

GenOn Energy, Inc. Exhibit Index

Number	Description	Method of Filing
10.1	First Amendment to Backstop Commitment Letter, dated as of August 9, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, the subsidiaries signatory thereto and the noteholders signatory thereto, amending that certain Backstop Commitment Letter, dated as of June 12, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, the subsidiaries signatory thereto and the noteholders signatory thereto.	Incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on August 15, 2017.
10.2	Amended and Restated Backstop Commitment Letter, dated as of October 2, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, the guarantors party thereto and backstop parties thereto.	Incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on October 6, 2017.
10.3	First Amendment, dated as of October 2, 2017, to the Restructuring Support and Lock-Up Agreement, dated as of June 12, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, NRG Energy, Inc. and the consenting noteholders party thereto.	Incorporated herein by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed on October 6, 2017.
10.4	Consent Agreement, dated as of October 30, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, and certain of their directly and indirectly-owned subsidiaries listed on the signature pages thereto, and the required consenting noteholders.	Incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on October 31, 2017.
31.1A1	Rule 13a-14(a)/15d-14(a) certification of Mark Allen McFarland.	Filed herewith.
31.2A1	Rule 13a-14(a)/15d-14(a) certification of Kirkland B. Andrews.	Filed herewith.
31.3A1	Rule 13a-14(a)/15d-14(a) certification of David Callen.	Filed herewith.
32.A1	Section 1350 Certification.	Furnished herewith.
101 INS	XBRL Instance Document.	Filed herewith.
101 SCH	XBRL Taxonomy Extension Schema.	Filed herewith.
101 CAL	XBRL Taxonomy Extension Calculation Linkbase.	Filed herewith.
101 DEF	XBRL Taxonomy Extension Definition Linkbase.	Filed herewith.
101 LAB	XBRL Taxonomy Extension Label Linkbase.	Filed herewith.
101 PRE	XBRL Taxonomy Extension Presentation Linkbase.	Filed herewith.

87

GenOn Americas Generation, LLC Exhibit Index

Number	Description	Method of Filing
10.1	First Amendment to Backstop Commitment Letter, dated as of August 9, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, the subsidiaries signatory thereto and the noteholders signatory thereto, amending that certain Backstop Commitment Letter, dated as of June 12, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, the subsidiaries signatory thereto and the noteholders signatory thereto.	Incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on August 15, 2017.
10.2	Amended and Restated Backstop Commitment Letter, dated as of October 2, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, the guarantors party thereto and backstop parties thereto.	Incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on October 6, 2017.
10.3	First Amendment, dated as of October 2, 2017, to the Restructuring Support and Lock-Up Agreement, dated as of June 12, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, NRG Energy, Inc. and the consenting noteholders party thereto.	Incorporated herein by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed on October 6, 2017.
10.4	Consent Agreement, dated as of October 30, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, and certain of their directly and indirectly-owned subsidiaries listed on the signature pages thereto, and the required consenting noteholders.	Incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on October 31, 2017.
31.1A2	Rule 13a-14(a)/15d-14(a) certification of Mark Allen McFarland.	Filed herewith.
31.2A2	Rule 13a-14(a)/15d-14(a) certification of Kirkland B. Andrews.	Filed herewith.
31.3A2	Rule 13a-14(a)/15d-14(a) certification of David Callen.	Filed herewith.
32.A2	Section 1350 Certification.	Furnished herewith.
101 INS	XBRL Instance Document.	Filed herewith.
101 SCH	XBRL Taxonomy Extension Schema.	Filed herewith.
101 CAL	XBRL Taxonomy Extension Calculation Linkbase.	Filed herewith.
101 DEF	XBRL Taxonomy Extension Definition Linkbase.	Filed herewith.
101 LAB	XBRL Taxonomy Extension Label Linkbase.	Filed herewith.
101 PRE	XBRL Taxonomy Extension Presentation Linkbase.	Filed herewith.

GenOn Mid-Atlantic, LLC Exhibit Index

Number	Description	Method of Filing
10.1	Consent Agreement, dated as of October 30, 2017, by and among GenOn Energy, Inc., GenOn Americas Generation, LLC, and certain of their directly and indirectly-owned subsidiaries listed on the signature pages thereto, and the required consenting noteholders.	Incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on October 31, 2017.
31.1A3	Rule 13a-14(a)/15d-14(a) certification of Mark Allen McFarland.	Filed herewith.
31.2A3	Rule 13a-14(a)/15d-14(a) certification of Kirkland B. Andrews.	Filed herewith.
31.3A3	Rule 13a-14(a)/15d-14(a) certification of David Callen.	Filed herewith.
32.A3	Section 1350 Certification.	Furnished herewith.
101 INS	XBRL Instance Document.	Filed herewith.
101 SCH	XBRL Taxonomy Extension Schema.	Filed herewith.
101 CAL	XBRL Taxonomy Extension Calculation Linkbase.	Filed herewith.
101 DEF	XBRL Taxonomy Extension Definition Linkbase.	Filed herewith.
101 LAB	XBRL Taxonomy Extension Label Linkbase.	Filed herewith.
101 PRE	XBRL Taxonomy Extension Presentation Linkbase.	Filed herewith.

88

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

GENON ENERGY, INC. (Registrant)
	/s/ MARK ALLEN MCFARLAND
	Mark Allen McFarland Chief Executive Officer
	(Principal Executive Officer)
	/s/ KIRKLAND B. ANDREWS
	Kirkland B. Andrews Chief Financial Officer
	(Principal Financial Officer)
	/s/ DAVID CALLEN
	David Callen Chief Accounting Officer
	(Principal Accounting Officer)

Date: November 6, 2017

89

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

GENON AMERICAS GENERATION, LLC (Registrant)
	/s/ MARK ALLEN MCFARLAND
	Mark Allen McFarland Chief Executive Officer
	(Principal Executive Officer)
	/s/ KIRKLAND B. ANDREWS
	Kirkland B. Andrews Chief Financial Officer
	(Principal Financial Officer)
	/s/ DAVID CALLEN
	David Callen Chief Accounting Officer
	(Principal Accounting Officer)

Date: November 6, 2017

90

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

GENON MID-ATLANTIC, LLC (Registrant)
	/s/ MARK ALLEN MCFARLAND
	Mark Allen McFarland Chief Executive Officer
	(Principal Executive Officer)
	/s/ KIRKLAND B. ANDREWS
	Kirkland B. Andrews Chief Financial Officer
	(Principal Financial Officer)
	/s/ DAVID CALLEN
	David Callen Chief Accounting Officer
	(Principal Accounting Officer)

Date: November 6, 2017

91

EX-31.1A1

EXHIBIT 31.1 A1

CERTIFICATION

I, Mark Allen McFarland, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Energy, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ MARK ALLEN MCFARLAND

Mark Allen McFarland

Chief Executive Officer

(Principal Executive Officer)

Date: November 6, 2017

EX-31.1A2

EXHIBIT 31.1 A2

CERTIFICATION

I, Mark Allen McFarland, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Americas Generation, LLC;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ MARK ALLEN MCFARLAND

Mark Allen McFarland

Chief Executive Officer

(Principal Executive Officer)

Date: November 6, 2017

EX-31.1A3

EXHIBIT 31.1 A3

CERTIFICATION

I, Mark Allen McFarland, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Mid-Atlantic, LLC;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ MARK ALLEN MCFARLAND

Mark Allen McFarland

Chief Executive Officer

(Principal Executive Officer)

Date: November 6, 2017

EX-31.2A1

EXHIBIT 31.2 A1

CERTIFICATION

I, Kirkland B. Andrews, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Energy, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

Date: November 6, 2017

EX-31.2A2

EXHIBIT 31.2 A2

CERTIFICATION

I, Kirkland B. Andrews, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Americas Generation, LLC;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

Date: November 6, 2017

EX-31.2A3

EXHIBIT 31.2 A3

CERTIFICATION

I, Kirkland B. Andrews, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Mid-Atlantic, LLC;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

Date: November 6, 2017

EX-31.3A1

EXHIBIT 31.3 A1

CERTIFICATION

I, David Callen, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Energy, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ DAVID CALLEN

David Callen

Chief Accounting Officer

(Principal Accounting Officer)

Date: November 6, 2017

EX-31.3A2

EXHIBIT 31.3 A2

CERTIFICATION

I, David Callen, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Americas Generation, LLC;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ DAVID CALLEN

David Callen

Chief Accounting Officer

(Principal Accounting Officer)

Date: November 6, 2017

EX-31.3A3

EXHIBIT 31.3 A3

CERTIFICATION

I, David Callen, certify that:

1. I have reviewed this quarterly report on Form 10-Q of GenOn Mid-Atlantic, LLC;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ DAVID CALLEN

David Callen

Chief Accounting Officer

(Principal Accounting Officer)

Date: November 6, 2017

EX-32.A1

EXHIBIT 32.A1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of GenOn Energy, Inc. on Form 10-Q for the quarter ended September 30, 2017, as filed with the Securities and Exchange Commission on the date hereof (the “Form 10-Q”), each of the undersigned officers of the Company certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to such officer's knowledge:

(1) The Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Form 10-Q.

Date: November 6, 2017

/s/ MARK ALLEN MCFARLAND

Mark Allen McFarland

Chief Executive Officer

(Principal Executive Officer)

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

/s/ DAVID CALLEN

David Callen

Chief Accounting Officer

(Principal Accounting Officer) 

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of this Form 10-Q or as a separate disclosure document.

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to GenOn Energy, Inc. and will be retained by GenOn Energy, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.A2

EXHIBIT 32.A2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of GenOn Americas Generation, LLC on Form 10-Q for the quarter ended September 30, 2017, as filed with the Securities and Exchange Commission on the date hereof (the “Form 10-Q”), each of the undersigned officers of the Company certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to such officer's knowledge:

(1) The Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Form 10-Q.

Date: November 6, 2017

/s/ MARK ALLEN MCFARLAND

Mark Allen McFarland

Chief Executive Officer

(Principal Executive Officer)

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

/s/ DAVID CALLEN

David Callen

Chief Accounting Officer

(Principal Accounting Officer) 

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of this Form 10-Q or as a separate disclosure document.

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to GenOn Americas Generation, LLC and will be retained by GenOn Americas Generation, LLC and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.A3

EXHIBIT 32.A3

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of GenOn Mid-Atlantic, LLC on Form 10-Q for the quarter ended September 30, 2017, as filed with the Securities and Exchange Commission on the date hereof (the “Form 10-Q”), each of the undersigned officers of the Company certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to such officer's knowledge:

(1) The Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Form 10-Q.

Date: November 6, 2017

/s/ MARK ALLEN MCFARLAND

Mark Allen McFarland

Chief Executive Officer

(Principal Executive Officer)

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

/s/ DAVID CALLEN

David Callen

Chief Accounting Officer

(Principal Accounting Officer) 

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of this Form 10-Q or as a separate disclosure document.

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to GenOn Mid-Atlantic, LLC and will be retained by GenOn Mid-Atlantic, LLC and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information	9 Months Ended
	Sep. 30, 2017 shares
Document and Entity Information [Line Items]
Entity Registrant Name	GenOn Energy, Inc.
Entity Central Index Key	0001126294
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding	0
GenOn Americas Generation, LLC
Document and Entity Information [Line Items]
Entity Registrant Name	GenOn Americas Generation, LLC
Entity Central Index Key	0001140761
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Entity Common Stock, Shares Outstanding	0
GenOn Mid-Atlantic, LLC
Document and Entity Information [Line Items]
Entity Registrant Name	GenOn Mid-Atlantic, LLC
Entity Central Index Key	0001138258
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Entity Common Stock, Shares Outstanding	0

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues
Total operating revenues	$ 484,000,000	$ 532,000,000	$ 1,231,000,000	$ 1,509,000,000
Operating Costs and Expenses
Depreciation and amortization	43,000,000	59,000,000	128,000,000	153,000,000
Impairment losses	0	0	0	59,000,000
Total operating costs and expenses	382,000,000	468,000,000	1,130,000,000	1,409,000,000
Gain on sale of assets	0	262,000,000	0	294,000,000
Operating (Loss)/Income	102,000,000	326,000,000	101,000,000	394,000,000
Other Income/(Expense)
Other income, net	3,000,000	2,000,000	9,000,000	6,000,000
Other expense	0	0	(18,000,000)	0
Total other expense	(1,000,000)	(42,000,000)	(100,000,000)	(126,000,000)
Income Before Reorganization Items and Income Taxes	101,000,000	284,000,000	1,000,000	268,000,000
Reorganization items, net	(29,000,000)	0	48,000,000	0
(Loss)/Income Before Income Taxes	72,000,000	284,000,000	49,000,000	268,000,000
Income tax expense	0	21,000,000	7,000,000	20,000,000
Net (Loss)/Income	72,000,000	263,000,000	42,000,000	248,000,000
GenOn Americas Generation, LLC
Operating Revenues
Total operating revenues	429,000,000	550,000,000	1,080,000,000	1,378,000,000
Operating Costs and Expenses
Depreciation and amortization	18,000,000	21,000,000	54,000,000	59,000,000
Total operating costs and expenses	397,000,000	478,000,000	1,050,000,000	1,264,000,000
Gain on sale of assets	0	74,000,000	0	77,000,000
Operating (Loss)/Income	32,000,000	146,000,000	30,000,000	191,000,000
Other Income/(Expense)
Other income, net	1,000,000	1,000,000	2,000,000	2,000,000
Total other expense		(14,000,000)	(24,000,000)	(42,000,000)
Income Before Reorganization Items and Income Taxes	32,000,000	132,000,000	6,000,000	149,000,000
Reorganization items, net	0	0	42,000,000	0
(Loss)/Income Before Income Taxes	32,000,000	132,000,000	48,000,000	149,000,000
Income tax expense	0	0	0	0
Net (Loss)/Income	32,000,000	132,000,000	48,000,000	149,000,000
GenOn Mid-Atlantic, LLC
Operating Revenues
Total operating revenues	130,000,000	230,000,000	366,000,000	585,000,000
Operating Costs and Expenses
Depreciation and amortization	16,000,000	16,000,000	47,000,000	45,000,000
Total operating costs and expenses	136,000,000	178,000,000	398,000,000	525,000,000
Operating (Loss)/Income	(6,000,000)	52,000,000	(32,000,000)	60,000,000
Other Income/(Expense)
Other income, net	1,000,000	1,000,000	1,000,000	1,000,000
Total other expense	0	(1,000,000)	(1,000,000)	(3,000,000)
(Loss)/Income Before Income Taxes	(6,000,000)	51,000,000	(33,000,000)	57,000,000
Income tax expense	0	0	0	0
Net (Loss)/Income	(6,000,000)	51,000,000	(33,000,000)	57,000,000
Non-affiliated Entity
Operating Revenues
Total operating revenues	483,000,000	544,000,000	1,161,000,000	1,515,000,000
Operating Costs and Expenses
Cost of operations	224,000,000	279,000,000	650,000,000	864,000,000
General and administrative	11,000,000	10,000,000	26,000,000	14,000,000
Other Income/(Expense)
Interest expense	(2,000,000)	(41,000,000)	(83,000,000)	(123,000,000)
Non-affiliated Entity | GenOn Americas Generation, LLC
Operating Revenues
Total operating revenues	402,000,000	494,000,000	1,003,000,000	1,362,000,000
Operating Costs and Expenses
Cost of operations	126,000,000	160,000,000	349,000,000	496,000,000
General and administrative	6,000,000	0	6,000,000	0
Other Income/(Expense)
Interest expense	(1,000,000)	(14,000,000)	(24,000,000)	(39,000,000)
Non-affiliated Entity | GenOn Mid-Atlantic, LLC
Operating Revenues
Total operating revenues	1,000,000	1,000,000	1,000,000	1,000,000
Operating Costs and Expenses
Cost of operations	104,000,000	157,000,000	273,000,000	414,000,000
General and administrative	6,000,000	0	6,000,000	0
Other Income/(Expense)
Interest expense	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Affiliated Entity
Operating Revenues
Total operating revenues	1,000,000	(12,000,000)	70,000,000	(6,000,000)
Operating Costs and Expenses
Cost of operations	90,000,000	74,000,000	226,000,000	180,000,000
General and administrative	14,000,000	46,000,000	100,000,000	139,000,000
Other Income/(Expense)
Interest expense	(2,000,000)	(3,000,000)	(8,000,000)	(9,000,000)
Affiliated Entity | GenOn Americas Generation, LLC
Operating Revenues
Total operating revenues	27,000,000	56,000,000	77,000,000	16,000,000
Operating Costs and Expenses
Cost of operations	238,000,000	276,000,000	588,000,000	647,000,000
General and administrative	9,000,000	21,000,000	53,000,000	62,000,000
Other Income/(Expense)
Interest expense	0	(1,000,000)	(2,000,000)	(5,000,000)
Affiliated Entity | GenOn Mid-Atlantic, LLC
Operating Revenues
Total operating revenues	129,000,000	229,000,000	365,000,000	584,000,000
Operating Costs and Expenses
Cost of operations	6,000,000	(10,000,000)	30,000,000	21,000,000
General and administrative	4,000,000	15,000,000	42,000,000	45,000,000
Other Income/(Expense)
Interest expense	$ 0	$ (1,000,000)	$ (1,000,000)	$ (3,000,000)

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 72	$ 263	$ 42	$ 248
Other Comprehensive Income, net of tax of $0:
Defined benefit plans	0	0	0	0
Other comprehensive income	0	0	0	0
Comprehensive Income	$ 72	$ 263	$ 42	$ 248

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Other comprehensive income, tax	$ 0	$ 0	$ 0	$ 0

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 810,000,000	$ 1,034,000,000
Restricted cash	1,000,000	0
Accounts receivable	124,000,000	109,000,000
Inventory	375,000,000	389,000,000
Cash collateral posted in support of energy risk management activities	72,000,000
Prepaid rent and other current assets	151,000,000	128,000,000
Total current assets	1,572,000,000	1,900,000,000
Property, plant and equipment, net	2,468,000,000	2,543,000,000
Other Assets
Intangible assets, net	26,000,000	62,000,000
Long-term deposits	130,000,000	0
Prepaid rent — non-current	352,000,000	245,000,000
Other non-current assets	136,000,000	94,000,000
Total other assets	661,000,000	417,000,000
Total Assets	4,701,000,000	4,860,000,000
Current Liabilities
Current portion of long-term debt and capital leases	1,000,000	704,000,000
Accrued expenses and other current liabilities	128,000,000	191,000,000
Total current liabilities	270,000,000	1,191,000,000
Liabilities Subject to Compromise	2,862,000,000	0
Other Liabilities
Long-term debt and capital leases	1,000,000	2,050,000,000
Out-of-market contracts	753,000,000	811,000,000
Other non-current liabilities	289,000,000	451,000,000
Total non-current liabilities	1,174,000,000	3,329,000,000
Total Liabilities	4,306,000,000	4,520,000,000
Commitments and Contingencies
Stockholder's Equity
Common stock: $0.001 par value, 1 share authorized and issued at September 30, 2017 and December 31, 2016	0	0
Additional paid-in capital	338,000,000	325,000,000
Retained earnings	86,000,000	44,000,000
Accumulated other comprehensive loss	(29,000,000)	(29,000,000)
Total Stockholder's Equity	395,000,000	340,000,000
Member’s Equity
Total Liabilities and Stockholder's Equity	4,701,000,000	4,860,000,000
GenOn Americas Generation, LLC
Current Assets
Cash and cash equivalents	174,000,000	471,000,000
Accounts receivable	111,000,000	85,000,000
Inventory	236,000,000	245,000,000
Cash collateral posted in support of energy risk management activities	70,000,000
Prepaid rent and other current assets	95,000,000	77,000,000
Total current assets	1,073,000,000	1,503,000,000
Property, plant and equipment, net	1,058,000,000	1,088,000,000
Other Assets
Intangible assets, net	26,000,000	62,000,000
Long-term deposits	130,000,000	0
Prepaid rent — non-current	278,000,000	204,000,000
Other non-current assets	28,000,000	11,000,000
Total other assets	487,000,000	311,000,000
Total Assets	2,618,000,000	2,902,000,000
Current Liabilities
Accrued expenses and other current liabilities	54,000,000	94,000,000
Total current liabilities	184,000,000	456,000,000
Liabilities Subject to Compromise	721,000,000	0
Other Liabilities
Long-term debt and capital leases	0	745,000,000
Out-of-market contracts	471,000,000	492,000,000
Other non-current liabilities	118,000,000	124,000,000
Total non-current liabilities	612,000,000	1,393,000,000
Total Liabilities	1,517,000,000	1,849,000,000
Commitments and Contingencies
Member’s Equity
Member’s interest	1,101,000,000	1,053,000,000
Total Liabilities and Stockholder's Equity	2,618,000,000	2,902,000,000
GenOn Mid-Atlantic, LLC
Current Assets
Cash and cash equivalents	175,000,000	471,000,000
Inventory	127,000,000	135,000,000
Cash collateral posted in support of energy risk management activities	0
Prepaid rent and other current assets	83,000,000	73,000,000
Total current assets	402,000,000	731,000,000
Property, plant and equipment, net	902,000,000	926,000,000
Other Assets
Intangible assets, net	10,000,000	10,000,000
Long-term deposits	130,000,000	0
Prepaid rent — non-current	280,000,000	204,000,000
Total other assets	422,000,000	218,000,000
Total Assets	1,726,000,000	1,875,000,000
Current Liabilities
Accrued expenses and other current liabilities	42,000,000	69,000,000
Total current liabilities	75,000,000	172,000,000
Other Liabilities
Out-of-market contracts	471,000,000	492,000,000
Other non-current liabilities	63,000,000	59,000,000
Total non-current liabilities	534,000,000	553,000,000
Total Liabilities	609,000,000	725,000,000
Commitments and Contingencies
Member’s Equity
Member’s interest	1,117,000,000	1,150,000,000
Total Liabilities and Stockholder's Equity	1,726,000,000	1,875,000,000
Non-affiliated Entity
Current Assets
Derivative instruments	29,000,000	54,000,000
Cash collateral posted in support of energy risk management activities	47,000,000	53,000,000
Other Assets
Derivative instruments	16,000,000	16,000,000
Current Liabilities
Accounts payable	79,000,000	113,000,000
Derivative instruments	26,000,000	46,000,000
Other Liabilities
Long-term debt and capital leases	1,000,000	2,050,000,000
Derivative instruments	2,000,000	10,000,000
Non-affiliated Entity | GenOn Americas Generation, LLC
Current Assets
Derivative instruments	29,000,000	54,000,000
Cash collateral posted in support of energy risk management activities	45,000,000	51,000,000
Other Assets
Derivative instruments	16,000,000	16,000,000
Current Liabilities
Accounts payable	39,000,000	61,000,000
Derivative instruments	26,000,000	46,000,000
Other Liabilities
Derivative instruments	2,000,000	10,000,000
Non-affiliated Entity | GenOn Mid-Atlantic, LLC
Current Assets
Accounts receivable	1,000,000	8,000,000
Current Liabilities
Accounts payable	19,000,000	30,000,000
Affiliated Entity
Current Assets
Derivative instruments	10,000,000	54,000,000
Cash collateral posted in support of energy risk management activities	25,000,000	79,000,000
Other Assets
Derivative instruments	1,000,000	0
Current Liabilities
Accounts payable	27,000,000	78,000,000
Derivative instruments	9,000,000	59,000,000
Other Liabilities
Long-term debt and capital leases	125,000,000	0
Derivative instruments	4,000,000	7,000,000
Affiliated Entity | GenOn Americas Generation, LLC
Current Assets
Note receivable	318,000,000	315,000,000
Derivative instruments	40,000,000	126,000,000
Cash collateral posted in support of energy risk management activities	25,000,000	79,000,000
Other Assets
Derivative instruments	9,000,000	18,000,000
Current Liabilities
Accounts payable	20,000,000	116,000,000
Derivative instruments	45,000,000	139,000,000
Other Liabilities
Derivative instruments	21,000,000	22,000,000
Affiliated Entity | GenOn Mid-Atlantic, LLC
Current Assets
Accounts receivable	6,000,000	0
Derivative instruments	10,000,000	44,000,000
Other Assets
Derivative instruments	2,000,000	4,000,000
Current Liabilities
Accounts payable	0	29,000,000
Derivative instruments	14,000,000	44,000,000
Other Liabilities
Derivative instruments	$ 0	$ 2,000,000

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	1	1
Common stock, shares issued (in shares)	1	1

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities
Net (Loss)/Income	$ 42	$ 248
Adjustments to reconcile net (loss)/income to net cash (used)/provided by operating activities:
Depreciation and amortization	128	153
Amortization of debt premiums	(24)	(39)
Non-cash adjustment to write-off unamortized debt premiums	(107)	0
Loss on financing arrangement for 2022 Notes	18	0
Amortization of out-of-market contracts and emission allowances	(59)	(58)
Gain on sale of assets	0	(294)
Impairment losses	0	59
Changes in derivative instruments	(13)	175
Changes in collateral deposits supporting energy risk management activities	60	(112)
Proceeds from sale of emission allowances	0	36
Lower of cost or market inventory adjustments	2	0
Changes in other working capital	(100)	22
Net Cash (Used)/Provided by Operating Activities	(53)	190
Cash Flows from Investing Activities
Capital expenditures	(69)	(239)
Proceeds from sale of assets, net	0	563
Other	0	2
Net Cash (Used)/Provided by Investing Activities	(69)	326
Cash Flows from Financing Activities
Payment for credit support	(130)	0
Payments for financing costs	(94)	0
Proceeds from draw on intercompany secured revolving credit facility	125	0
Payments for current and long-term debt	(2)	(4)
Net Cash Used by Financing Activities	(101)	(4)
Net (Decrease)/Increase in Cash, Cash Equivalents and Funds Deposited by Counterparties	(223)	512
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at Beginning of Period	1,034	716
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at End of Period	811	1,228
Cash and Cash Equivalents at Beginning of Period	1,034
Cash and Cash Equivalents at End of Period	810
GenOn Americas Generation, LLC
Cash Flows from Operating Activities
Net (Loss)/Income	48	149
Adjustments to reconcile net (loss)/income to net cash (used)/provided by operating activities:
Depreciation and amortization	54	59
Amortization of debt premiums	(3)	(5)
Non-cash adjustment to write-off unamortized debt premiums	(47)	0
Amortization of out-of-market contracts and emission allowances	(21)	(20)
Gain on sale of assets	0	(77)
Changes in derivative instruments	(3)	182
Changes in collateral deposits supporting energy risk management activities	60	(119)
Lower of cost or market inventory adjustments	2	0
Changes in other working capital	(80)	(16)
Net Cash (Used)/Provided by Operating Activities	10	153
Cash Flows from Investing Activities
Capital expenditures	(33)	(44)
Proceeds from sale of assets, net	0	76
Net Cash (Used)/Provided by Investing Activities	(36)	32
Cash Flows from Financing Activities
Payment for amounts due to GenOn Energy, Inc.	(125)	0
Payment for credit support	(130)	0
Payments for financing costs	(16)	0
Net Cash Used by Financing Activities	(271)	0
Net (Decrease)/Increase in Cash, Cash Equivalents and Funds Deposited by Counterparties	(297)	185
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at Beginning of Period	471	297
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at End of Period	174	482
Cash and Cash Equivalents at Beginning of Period	471
Cash and Cash Equivalents at End of Period	174
GenOn Americas Generation, LLC | Affiliated Entity
Cash Flows from Investing Activities
Increase in notes receivable — affiliate	(3)	0
GenOn Mid-Atlantic, LLC
Cash Flows from Operating Activities
Net (Loss)/Income	(33)	57
Adjustments to reconcile net (loss)/income to net cash (used)/provided by operating activities:
Depreciation and amortization	47	45
Amortization of out-of-market contracts and emission allowances	(21)	(21)
Changes in derivative instruments	4	160
Lower of cost or market inventory adjustments	2	0
Changes in other working capital	(9)	(17)
Net Cash (Used)/Provided by Operating Activities	(10)	224
Cash Flows from Investing Activities
Capital expenditures	(30)	(40)
Net Cash (Used)/Provided by Investing Activities	(30)	(40)
Cash Flows from Financing Activities
Payment for amounts due to GenOn Energy, Inc.	(125)	0
Payment for credit support	(130)	0
Payments for financing costs	(1)	0
Net Cash Used by Financing Activities	(256)
Net (Decrease)/Increase in Cash and Cash Equivalents	(296)	184
Cash and Cash Equivalents at Beginning of Period	471	299
Cash and Cash Equivalents at End of Period	$ 175	$ 483

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Basis of Presentation (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Basis of Presentation (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

GenOn Energy, Inc., a wholly owned subsidiary of NRG, is a wholesale power generator engaged in the ownership and operation of power generation facilities, with 15,395 MW of net electric generating capacity located in the U.S. On January 1, 2017, GenOn Americas Generation deactivated Pittsburg which resulted in the decrease in operating generation capacity of 1,029 MW from December 31, 2016.

GenOn Americas Generation is a wholesale power generator with 6,878 MW of net electric generating capacity located, in many cases, near major metropolitan areas. GenOn Americas Generation's electric generating capacity is part of the 15,395 MW of net electric generating capacity of GenOn.

GenOn Mid-Atlantic operates and owns or leases 4,605 MW of net electric generating capacity in Maryland near Washington, D.C. GenOn Mid-Atlantic’s electric generating capacity is part of the 6,878 MW of net electric generating capacity of GenOn Americas Generation. GenOn Mid-Atlantic’s generating stations serve the Eastern PJM markets.

GenOn Americas Generation and GenOn Mid-Atlantic are Delaware limited liability companies and indirect wholly owned subsidiaries of GenOn. GenOn Mid-Atlantic is an indirect wholly owned subsidiary of GenOn Americas Generation.

The Registrants sell power from their generation portfolio, offer capacity or similar products to retail electric providers and others, and provide ancillary services to support system reliability.

Chapter 11 Cases

As further described in Note 3, Chapter 11 Cases, on June 14, 2017, GenOn, along with GenOn Americas Generation and certain of their directly and indirectly-owned subsidiaries, or collectively the GenOn Entities, filed voluntary petitions for relief under Chapter 11, or the Chapter 11 Cases, of the United States Bankruptcy Code, or the Bankruptcy Code, in the United States Bankruptcy Court for the Southern District of Texas, Houston Division, or the Bankruptcy Court. GenOn Mid-Atlantic, as well as its consolidated subsidiaries, REMA and certain other subsidiaries, did not file for relief under Chapter 11.

The GenOn Entities remain in possession of their property and continue their business operations in the ordinary course uninterrupted as "debtors-in-possession" under jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court. The consolidated financial statements for GenOn and GenOn Americas Generation were prepared in accordance with Accounting Standards Codification (ASC) 852, Reorganizations, for debtors-in-possession.

On June 29, 2017, the GenOn Entities filed a Joint Plan of Reorganization pursuant to Chapter 11 of the Bankruptcy Code (as may be amended, modified or supplemented from time to time), or the Plan, and a related Disclosure Statement, or the Disclosure Statement, with the Bankruptcy Court consistent with the restructuring support and lock-up agreement, or Restructuring Support Agreement, by and among the GenOn Entities, NRG, certain holders representing greater than 93% in aggregate principal amount of GenOn’s Senior Notes and certain holders representing greater than 93% in aggregate principal amount of GenOn Americas Generation’s Senior Notes, as further described in Note 3, Chapter 11 Cases.

Liquidity and Ability to Continue as a Going Concern

As described above and in Note 3, Chapter 11 Cases, the GenOn Entities have submitted the Plan in connection with the Chapter 11 Cases. There is no assurance that such Plan will be approved by the requisite stakeholders, confirmed by the Bankruptcy Court, or successfully implemented thereafter. GenOn's and GenOn Americas Generation’s ability to continue as a going concern is dependent on many factors, including the successful confirmation of the Plan and emergence from bankruptcy. Given the uncertainty as to the outcome of these factors, there is substantial doubt about GenOn's and GenOn Americas Generation's ability to continue as a going concern.

The accompanying unaudited interim condensed consolidated financial statements have been prepared assuming GenOn will continue as a going concern, which contemplates continuity of operations, realization of assets and the satisfaction of liabilities in the normal course of business. As such, the accompanying unaudited interim condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of assets and their carrying amounts, or the amount and classification of liabilities that may result should GenOn be unable to continue as a going concern. Such adjustments could have a material adverse impact on GenOn's results of operations, cash flows and financial position.

With respect to GenOn Mid-Atlantic, a consolidated subsidiary of GenOn, management has determined that while it has sufficient cash on hand to fund current obligations including operating lease payments due under the GenOn Mid-Atlantic operating leases as of September 30, 2017, the potential significant adverse impact of financial stresses at GenOn Mid-Atlantic's parent companies and any adverse impact resulting from the notification by GenOn Mid-Atlantic's owner lessors alleging the existence of certain lease events of default as further described in Note 8, Debt and Capital Leases, has caused there to be substantial doubt about GenOn Mid-Atlantic's ability to continue as a going concern.

Basis of Presentation

This is a combined quarterly report of the Registrants for the quarter ended September 30, 2017. The notes to the condensed consolidated financial statements apply to the Registrants as indicated parenthetically next to each corresponding disclosure. The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with the SEC's regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the financial statements in the Registrants' 2016 Form 10-K. Interim results are not necessarily indicative of results for a full year.

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

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

Reclassifications

Certain prior year amounts have been reclassified for comparative purposes.  The reclassifications did not affect results from operations, net assets or cash flows.

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Summary of Significant Accounting Policies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Summary of Significant Accounting Policies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Other Balance Sheet Information (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

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

	Property, plant and equipment Accumulated depreciation				Intangible assets Accumulated amortization
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
GenOn	$	730	$	604	$	66	$	87
GenOn Americas Generation	329		275		66		87
GenOn Mid-Atlantic	284		237		33		29

Recent Accounting Developments — Guidance Adopted in 2017 (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

ASU 2016-18 — In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash, or ASU No. 2016-18. The amendments of ASU No. 2016-18 require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts on the statement of cash flows. For GenOn and GenOn Americas Generation, this includes amounts classified as funds deposited by counterparties. The amendments of ASU No. 2016-18 are effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods.  Early adoption is permitted and the adoption of ASU No. 2016-18 will be applied retrospectively. GenOn and GenOn Americas Generation adopted the guidance in ASU No. 2016-18 during the second quarter of 2017. In connection with the adoption of the standard, the Registrants have applied the guidance retrospectively which resulted in a decrease of the cash flows provided by operating activities of $41 million for the nine months ended September 30, 2016 for GenOn and GenOn Americas Generation. The adoption of ASU No. 2016-18 did not have an impact to GenOn Mid-Atlantic's statement of cash flows.

Recent Accounting Developments — Guidance Not Yet Adopted (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

ASU 2017-12 — In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities, or ASU No. 2017-12. The amendments of ASU No. 2017-12 were issued to simplify the application of hedge accounting guidance and more closely align financial reporting for hedging relationships with economic results of an entity's risk management activities. The issues addressed by ASU No. 2017-12 include but are not limited to alignment of risk management activities and financial reporting, risk component hedging, accounting for the hedged item in fair value hedges of interest rate risk, recognition and presentation of the effects of hedging instruments, amounts excluded from the assessment of hedge effectiveness, and other simplifications of hedge accounting guidance. The amendments of ASU No. 2017-12 are effective for fiscal years beginning after December 15, 2018, and interim periods therein.  Early adoption is permitted in any interim period and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The Registrants do not expect the adoption of ASU No. 2017-12 will have a material impact on their consolidated results of operations, cash flows, and statement of financial position.

ASU 2017-07 — In March 2017, the FASB issued ASU No. 2017-07, Compensation — Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, or ASU No. 2017-07.   Current GAAP does not indicate where the amount of net benefit cost should be presented in an entity’s income statement and does not require entities to disclose the amount of net benefit cost that is included in the income statement.  The amendments of ASU No. 2017-07 require an entity to report the service cost component of net benefit costs in the same line item as other compensation costs arising from services rendered by the related employees during the applicable service period.  The other components of net benefit cost are required to be presented separately from the service cost component and outside the subtotal of income from operations. Further, ASU No. 2017-07 prescribes that only the service cost component of net benefit costs is eligible for capitalization. The amendments of ASU No. 2017-07 are effective for fiscal years beginning after December 15, 2017, including interim periods therein.  Early adoption is permitted and must be applied on a retrospective basis, except for the amendments regarding the capitalization of the service cost component, which must be applied prospectively. GenOn is currently assessing the impact that the adoption of ASU No. 2017-07 will have on its results of operations, cash flows, and statement of financial position.

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

ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or Topic 606, which was further amended through various updates issued by the FASB thereafter. The amendments of Topic 606 completed the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. The guidance under Topic 606 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes a five step model to be applied by an entity in evaluating its contracts with customers. The Registrants expect to adopt the standard effective January 1, 2018 and apply the guidance retrospectively to contracts at the date of adoption. The Registrants will recognize the cumulative effect of applying Topic 606 at the date of initial application, as prescribed under the modified retrospective transition method. The Registrants also expect to elect the practical expedient available under Topic 606 for measuring progress toward complete satisfaction of a performance obligation and for disclosure requirements of remaining performance obligations. The practical expedient allows an entity to recognize revenue in the amount to which the entity has the right to invoice such that the entity has a right to the consideration in an amount that corresponds directly with the value to the customer for performance completed to date by the entity. In 2016, the Registrants continued to assess the new standard with a focus on identifying the performance obligations included within its revenue arrangements with customers and evaluating the Registrants' methods of estimating the amount and timing of variable consideration. While the impact remains subject to continued review, the Registrants do not believe the adoption of Topic 606 will have a material impact on their financial statements.

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Chapter 11 Cases (GenOn and GenOn Americas Generation)

9 Months Ended

Sep. 30, 2017

Reorganizations [Abstract]

Chapter 11 Cases (GenOn and GenOn Americas Generation)

Chapter 11 Cases(GenOn and GenOn Americas Generation)

Chapter 11 Cases

On June 14, 2017, or the Petition Date, the GenOn Entities filed the Chapter 11 Cases. GenOn Mid-Atlantic, as well as its consolidated subsidiaries, REMA, and certain other subsidiaries, did not file for relief under Chapter 11.

The GenOn Entities remain in possession of their property and continue their business operations in the ordinary course uninterrupted as "debtors-in-possession" under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court.

On June 29, 2017, the GenOn Entities filed the Plan and the Disclosure Statement with the Bankruptcy Court consistent with the Restructuring Support Agreement. On September 18, 2017 and October 2, 2017, the GenOn Entities filed the Amended Plan and Amended Disclosure Statement and Second Amended Plan and Second Amended Disclosure Statement, respectively, which primarily provided the GenOn Entities with the flexibility to complete sales of certain assets pursuant to the Amended Plan and removed the GenOn Entities' requirement to conduct a rights offering in connection with the GenOn Entities' exit financing.

On October 31, 2017, the GenOn Entities announced that they entered into a Consent Agreement with certain holders of GenOn’s Senior Notes and GenOn Americas Generation's Senior Notes, collectively, the Consenting Holders, whereby the GenOn Entities and the Consenting Holders have agreed to extend the milestones in the Restructuring Support Agreement, by which the Plan must become effective, or the Effective Date. Specifically, the Consent Agreement extends the Effective Date milestone to June 30, 2018 or September 30, 2018, if regulatory approvals are still pending, or the Extended Effective Dates. The Consenting Holders’ consent to the Extended Effective Dates is contingent upon entry of an order as described in the Consent Agreement.

In addition, the GenOn Entities announced that, over the course of the past several weeks, both the principals and advisors of NRG and GenOn have been engaged in lengthy in-person negotiations in an effort to settle certain items that remained open and unresolved after the pre-petition Restructuring Support Agreement negotiations. These arms-length discussions included key topics such as: (i) timeline and transition, (ii) cooperation and co-development matters, (iii) post-employment and retiree health and welfare benefits and pension benefits, (iv) tax matters, and (v) intercompany balances. The agreements reached on these topics will be incorporated into definitive documents for GenOn’s emergence from Chapter 11.

On October 30, 2017, the GenOn Entities filed the Plan Supplement Documents, consisting of, among other things, new organizational documents, new exit financing documents, a pension indemnity agreement, an employee matters agreement, schedules of assumed and rejected executory contracts and unexpired leases, and the Backstop Commitment Letter.  The Plan Supplement Documents are subject to ongoing review, revision, and further negotiation by the parties to the Restructuring Support Agreement including the GenOn Debtors, Consenting Holders and NRG, who have various consent rights over the final form of the Plan Supplement Documents, and may be amended, modified, supplemented, and revised in accordance with those ongoing negotiations.

Restructuring Support Agreement

Prior to filing the Chapter 11 Cases, the GenOn Entities entered into the Restructuring Support Agreement on June 12, 2017 that provides for a restructuring and recapitalization of the GenOn Entities through a prearranged plan of reorganization. Completion of the agreed upon terms is contingent upon certain milestones in the Restructuring Support Agreement. Certain principal terms of the Restructuring Support Agreement are detailed below:

1) Full releases from GenOn and GenOn Americas Generation in favor of NRG, including either a full release or indemnification in favor of NRG for any claims relating to GenOn Mid-Atlantic or REMA and the dismissal of all litigation against NRG.

2) GenOn will receive cash consideration from NRG of $261.3 million pursuant to a settlement executed in connection with the Plan, which will be received in cash less any amounts owed to NRG under the intercompany secured revolving credit facility, or the Intercompany Revolver. As of September 30, 2017, GenOn owed NRG approximately $125 million under the Intercompany Revolver. See Note 10, Related Party Transactions, for further discussion of the Intercompany Revolver.

3) NRG will consent to the cancellation of its interests in the equity of GenOn. The equity interests in the reorganized GenOn will be issued to the holders of the GenOn Senior Notes along with a cash payment from NRG equal to approximately $75 million, which is included in the $261.3 million mentioned above, and, subject to certain eligibility restrictions, rights to participate pro rata in a new secured notes offering, as further described below.

4) NRG will retain the pension liability, including payment of approximately $13 million of 2017 pension contributions, for GenOn employees for service provided prior to the completion of the reorganization, which was paid in September 2017 and was reflected as a capital contribution to GenOn. GenOn’s pension liability as of September 30, 2017 was approximately $106 million.

5) The shared services agreement between GenOn and NRG will be amended such that (i) GenOn will receive shared services from NRG at an annualized rate of $84 million during the pendency of the Chapter 11 Cases, (ii) if the settlement is approved by the bankruptcy court, GenOn will receive shared services from NRG at no charge for two months, and (iii) NRG will then provide an option for up to two, one-month extensions for shared services at an annualized rate of $84 million. See Note 10, Related Party Transactions, for further discussion of the shared services agreement.

6) GenOn will receive a credit of approximately $28 million from NRG to apply against amounts owed under the shared services agreement upon emergence from bankruptcy. Any unused amount can be paid in cash at GenOn's request. The credit is specifically equal to the amount of the 4% aggregate principal amount of the new senior secured first lien notes due 2022, or the 2022 Notes, plus accrued interest from the date of entry into the escrow agreement entered into in connection with the 2022 Notes and is intended to reimburse GenOn for its payment of such amount, as described below.

7) NRG agreed to provide GenOn with a letter of credit facility during the pendency of the Chapter 11 Cases, which could be utilized for required letters of credit in lieu of the Intercompany Revolver. GenOn can no longer utilize the Intercompany Revolver and, on July 27, 2017, the letter of credit facility was terminated, as GenOn had obtained a separate letter of credit facility with a third party financial institution. See Note 10, Related Party Transactions, for further discussion of the Intercompany Revolver and the letter of credit facility and Note 8, Debt and Capital Leases, for the letter of credit facility obtained in July 2017.

8) Certain holders of the Senior Notes, known as the Backstop Parties, have executed a letter of commitment, or the Backstop Commitment Letter, pursuant to which the Backstop Parties committed to backstop the exit financing obtained by GenOn to facilitate the payment of the obligations under the Plan and other working capital needs of the GenOn Entities upon their emergence from Chapter 11.

9) GenOn and NRG have agreed to cooperate in good faith to maximize the value of certain development projects.

In addition to the Restructuring Support Agreement, additional support and other agreements are being negotiated, including a transition services agreement.

The filing of the Chapter 11 Cases automatically stayed most actions against the GenOn Entities pursuant to Section 362(a) of the Bankruptcy Code. Absent an order from the Bankruptcy Court, the GenOn Entities' pre-petition liabilities are subject to settlement under the Plan.

The GenOn Entities have filed certain motions with the Bankruptcy Court that have been approved. The GenOn Entities expect to operate in the normal course of business throughout the reorganization process. The GenOn Entities have continued to make payments to certain vendors with respect to pre-petition liabilities as permitted by the Bankruptcy Court order, and vendors have been paid for goods and services provided after the Petition Date in the ordinary course of business.

GenOn Debt

As of September 30, 2017, the Intercompany Revolver, GenOn Senior Notes, and GenOn Americas Generation Senior Notes totaled approximately $2.6 billion. The filing of the Chapter 11 Cases constitutes an event of default under the following debt instruments, or collectively, the Debt Documents:

1) The Intercompany Revolver with NRG;

2) The indenture governing the GenOn 7.875% Senior Notes due 2017 (as amended or supplemented from time to time);

3) The indenture governing the GenOn 9.500% Notes due 2018 (as amended or supplemented from time to time);

4) The indenture governing the GenOn 9.875% Notes due 2020 (as amended or supplemented from time to time);

5) The indenture governing the GenOn Americas Generation 8.50% Senior Notes due 2021 (as amended or supplemented from time to time); and

6) The indenture governing the GenOn Americas Generation 9.125% Senior Notes due 2031 (as amended or supplemented from time to time).

The Debt Documents set forth in 1-4 above provide that as a result of the commencement of the Chapter 11 Cases the principal and accrued interest due thereunder was immediately due and payable. The Debt Documents set forth in 5-6 above provide that as a result of the commencement of the Chapter 11 Cases the applicable indenture trustee or certain holders of the notes may declare the principal and accrued interest due thereunder to be immediately due and payable.  Any efforts to enforce such payment obligations under the Debt Documents were automatically stayed as a result of the commencement of the Chapter 11 Cases, and the holders’ rights of enforcement in respect of the Debt Documents are subject to the applicable provisions of the Bankruptcy Code. The Chapter 11 Cases could also potentially give rise to counterparty rights and remedies under other documents. For further discussion, see Note 8, Debt and Capital Leases and Note 11, Commitments and Contingencies.

2022 Notes

On May 8, 2017, a remote special purpose limited liability company issued $550 million in principal amount of notes that bore interest at a rate of 10.5% with a maturity date of June 1, 2022. The proceeds were deposited into a separate and independently maintained escrow account along with 4% of the principal amount and accrued interest from May 8, 2017 through June 15, 2017 totaling $28 million. If certain conditions were satisfied, GenOn was expected to merge with the remote special purpose limited liability company and assume the obligation for the 2022 Notes, which were to be secured by certain of GenOn’s and its subsidiaries' assets. Based on the terms of the underlying transaction documents governing the 2022 Notes, on June 14, 2017, when GenOn filed the Chapter 11 Cases, the funds held in the escrow account were released to the holders of the 2022 Notes, which were simultaneously redeemed. In connection with the escrow release, GenOn expensed $18 million in fees incurred in connection with the 2022 Notes offering in other expense. These fees, along with the $28 million that will be reimbursed by NRG, as further described in Note 10, Related Party Transactions, for total of $46 million, are reflected as financing costs in the statement of cash flows.

Backstop Fee

The Restructuring Support Agreement also contemplates $900 million in aggregate principal amount of exit financing sought by GenOn primarily to refinance existing indebtedness and pay distributions under the Plan. Consistent with the terms of the Backstop Commitment Letter, GenOn paid $45 million in total (5% of the principal amount of the exit financing), or the Backstop Fee, to certain holders of notes issued by GenOn and GenOn Americas Generation, or the Backstop Parties, in exchange for the Backstop Parties’ joint commitment to fully subscribe the exit financing in the event that certain other parties do not fund the full commitments of the exit financing. On October 2, 2017, the GenOn Entities amended the backstop commitment letter to, among other things, remove the requirement to conduct a rights offering.

The Backstop Fee was considered earned by the Backstop Parties and was paid on June 13, 2017. This payment is effectively a discount (a reduction of the proceeds to be received by GenOn from the noteholders) and is reported in other non-current assets on GenOn’s consolidated balance sheet as of September 30, 2017. When the financing is in effect, it will be reported as a direct reduction from the carrying amount of the debt and amortized over the five-year term as interest expense. The Backstop Fee is reflected as financing costs in the statement of cash flows.

Accounting for Reorganization

As a result of the Chapter 11 Cases, realization of assets and satisfaction of liabilities are subject to a significant number of uncertainties. The consolidated financial statements for GenOn and GenOn Americas Generation were prepared in accordance with Accounting Standards Codification (ASC) 852, Reorganizations, for debtors-in-possession.

Based on the events leading up to the Chapter 11 Cases, including the most recent PJM auction results, the Registrants considered whether it was necessary to impair any of their long-lived assets and concluded that no impairment had occurred as of September 30, 2017. 

Liabilities Subject to Compromise

GenOn's and GenOn Americas Generation's condensed consolidated balance sheets as of September 30, 2017 include amounts classified as liabilities subject to compromise which include prepetition liabilities that were allowed or that are estimated would be allowed as claims in its Chapter 11 proceedings. If there is uncertainty about whether a claim will be impaired under the Plan, the entire amount of the claim is included in liabilities subject to compromise. The following table summarizes the components of liabilities subject to compromise included on the condensed consolidated balance sheets of GenOn and GenOn Americas Generation:

	As of September 30, 2017
	GenOn		GenOn Americas Generation
	(In millions)
Accounts payable and accrued expenses	$	46	$	9
Long-term debt, including current portion	2,616		695
Accrued interest	56		10
Pension and post-retirement liabilities	131		—
Other	13		7
	$	2,862	$	721

Interest Expense

GenOn and GenOn Americas Generation will not pay interest expense during bankruptcy and it is not expected to be an allowable claim. Therefore, GenOn and GenOn Americas Generation did not record interest on the GenOn Senior Notes or the GenOn Americas Generation Senior Notes in the amount of $49 million and $18 million, respectively, for the period from June 14, 2017 through September 30, 2017.

Reorganization Items

Reorganization items represent costs and income directly associated with the Chapter 11 proceedings. The below table represents the significant items in reorganization items for GenOn and GenOn Americas Generation:

	Three months ended September 30, 2017					Nine months ended September 30, 2017
	GenOn			GenOn Americas Generation		GenOn			GenOn Americas Generation
	(In millions)					(In millions)
Legal and other professional advisory fees	$	(29	)	$	—	$	(55	)	$	(1	)
Write-off of debt premiums and credit reserves	—			—		103			43
	$	(29	)	$	—	$	48		$	42

During the nine months ended September 30, 2017, $32 million of cash payments were made by GenOn for reorganization items.

Debtors' Financial Information (GenOn and GenOn Americas Generation)

The financial information below represents the Debtor Entities condensed combined financial statements for the three months ended September 30, 2017 and the period from June 14, 2017 through September 30, 2017. The following represent the entities included in the GenOn Entities, or the GenOn Energy, Inc. Debtors:

GenOn Americas Generation, LLC1	NRG Lovett LLC1
GenOn Americas Procurement, Inc.	NRG New York LLC1
GenOn Asset Management, LLC	NRG North America LLC1
GenOn Capital Inc.	NRG Northeast Generation, Inc.
GenOn Energy Holdings, Inc.	NRG Northeast Holdings, Inc.
GenOn Energy Management, LLC1	NRG Potrero LLC1
GenOn Energy Services, LLC	NRG Power Generation Assets LLC
GenOn Energy, Inc.	NRG Power Generation LLC
GenOn Fund 2001 LLC	NRG Power Midwest GP LLC
GenOn Mid-Atlantic Development, LLC	NRG Power Midwest LP
GenOn Power Operating Services MidWest, Inc.	NRG Sabine (Delaware), Inc.
GenOn Special Procurement, Inc.1	NRG Sabine (Texas), Inc.
Hudson Valley Gas Corporation1	NRG San Gabriel Power Generation LLC
Mirant Asia-Pacific Ventures, LLC	NRG Tank Farm LLC
Mirant Intellectual Asset Management and Marketing, LLC	NRG Wholesale Generation GP LLC
Mirant International Investments, Inc.	NRG Wholesale Generation LP
Mirant New York Services, LLC	NRG Willow Pass LLC
Mirant Power Purchase, LLC	Orion Power New York GP, Inc.
Mirant Wrightsville Investments, Inc.	Orion Power New York LP, LLC
Mirant Wrightsville Management, Inc.	Orion Power New York, L.P.
MNA Finance Corp.1	RRI Energy Broadband, Inc.
NRG Americas, Inc.	RRI Energy Channelview (Delaware) LLC
NRG Bowline LLC1	RRI Energy Channelview (Texas) LLC
NRG California North LLC1	RRI Energy Channelview LP
NRG California South GP LLC	RRI Energy Communications, Inc.
NRG California South LP	RRI Energy Services Channelview LLC
NRG Canal LLC1	RRI Energy Services Desert Basin, LLC
NRG Delta LLC1	RRI Energy Services, LLC
NRG Florida GP, LLC	RRI Energy Solutions East, LLC
NRG Florida LP	RRI Energy Trading Exchange, Inc.
NRG Lovett Development I LLC1	RRI Energy Ventures, Inc.

¹ Represent the GenOn Americas Generation debtor entities, or the GenOn Americas Generation Debtors.

Supplemental Condensed Combined Statement of Operations
(Unaudited)
	Three months ended September 30, 2017						Period from June 14, 2017 through September 30, 2017
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors			GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)						(In millions)
Total operating revenues	$	500		$	446		$	594		$	511
Total operating costs and expenses	396			408			462			471
Operating Income	104			38			132			40
Other Expense
Total other expense	(3		)	(5		)	(4		)	(6		)
Income Before Reorganization Items and Income Taxes	101			33			128			34
Reorganization items, net	(29		)	—			74			43
Income Before Income Taxes	72			33			202			77
Income tax expense	—			—			—			—
Net Income	$	72		$	33		$	202		$	77

The condensed combined comprehensive income for GenOn Energy, Inc. Debtors and the GenOn Americas Generation Debtors is equal to the condensed combined net income for the three months ended September 30, 2017 and the period from June 14, 2017 through September 30, 2017.

Supplemental Condensed Combined Balance Sheet
As of September 30, 2017
(Unaudited)
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)
ASSETS
Cash and cash equivalents	$	568		$	—
Restricted cash	1			—
Accounts receivable	117			110
Accounts receivable — affiliate	658			—
Notes receivable — affiliate	—			318
Prepaid rent and other current assets	898			274
Total current assets	2,242			702
Property, plant and equipment, net	1,235			155
Investment in subsidiaries	(269		)	1,117
Notes receivable — affiliate	544			—
Other non-current assets	144			68
Total Assets	$	3,896		$	2,042
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	$	42		$	20
Accounts payable — affiliate	—			26
Accrued expenses and other current liabilities	134			93
Total current liabilities	176			139
Liabilities subject to compromise	2,862			721
Long-term debt — affiliate	125			—
Other non-current liabilities	338			81
Total Liabilities	3,501			941
Stockholder's equity	395			1,101
Total Liabilities and Stockholder's Equity	$	3,896		$	2,042

Supplemental Condensed Combined Statement of Cash Flows
Period from June 14, 2017 through September 30, 2017
(Unaudited)
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)
Net cash provided by operating activities	$	97		$	4
Net cash used by investing activities	(9		)	(4		)
Net cash used by financing activities	(3		)	—
Net increase in cash, cash equivalents and restricted cash	85			—
Cash, cash equivalents and restricted cash at beginning of period	484			—
Cash, cash equivalents and restricted cash at end of period	$	569		$	—

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Dispositions (GenOn and GenOn Americas Generation)

9 Months Ended

Sep. 30, 2017

Discontinued Operations and Disposal Groups [Abstract]

Dispositions (GenOn and GenOn Americas Generation)

Dispositions (GenOn and GenOn Americas Generation)

2017 Dispositions

Sale of Emission Allowances (GenOn and GenOn Americas Generation)

During the first quarter of 2017, GenOn Energy Management, through its existing agreement with NRG Power Marketing, LLC, sold 1.3 million of certain emission credit allowances for proceeds of $18 million resulting in a gain on the sale of approximately $1 million.

2016 Dispositions

Potrero Disposition (GenOn and GenOn Americas Generation)

On September 26, 2016, NRG Potrero LLC, or Potrero, an indirect wholly owned subsidiary of GenOn Americas Generation, completed the sale of real property at the Potrero generating station located in San Francisco, CA to California Barrel Company, LLC for total consideration of $86 million comprised of $74 million of cash received, which is net of $8 million of closing costs and $4 million to be held in escrow in order to cover post-closing obligations. The sale resulted in a gain of approximately $74 million recognized within GenOn Americas Generation's consolidated results of operations during the third quarter of 2016.

Aurora Disposition (GenOn)

On May 12, 2016, GenOn entered into an agreement with RA Generation, LLC to sell the Aurora Generating Station, or Aurora, for cash consideration of $365 million, subject to adjustments for working capital and the results of the PJM 2019/2020 Base Residual Auction. Aurora is an 878 MW natural gas facility located in Aurora, Illinois. On July 12, 2016, GenOn completed the sale of Aurora for cash proceeds of $369 million, including $4 million in adjustments primarily for the PJM base residual auction results and estimated working capital, which is subject to further adjustment. The sale resulted in a gain of approximately $188 million recognized within GenOn's consolidated results of operations during the quarter ended September 30, 2016. In connection with the sale, GenOn issued a guaranty to RA Generation, LLC for the payment of certain indemnified costs related to any damages, losses, or other expenses arising out of misrepresentation or breach of warranties or covenants under the purchase agreement subject to a cap of $365 million, which is reduced to $183 million on January 1, 2018 and then to $91 million beginning January 1, 2019 and will terminate upon the third anniversary of the sale.

Seward Disposition (GenOn)

On November 24, 2015, GenOn entered into an agreement with Seward Generation, LLC and an affiliate of Robindale Energy Services, Inc. to sell the Seward Generating Station, a 525 MW coal-fired facility in Pennsylvania, for cash consideration of $75 million. On February 2, 2016, GenOn completed the sale of Seward and received gross cash proceeds of $75 million excluding $3 million of cash on hand transferred to the buyer. GenOn will also receive $5 million in deferred cash consideration in five$1 million annual installments, of which $1 million has been received as of September 30, 2017, and $2.5 million in payments contingent upon certain environmental requirements being imposed by August 2017, which has been collected in September 2017. In addition, Robindale committed to future inventory purchases from GenOn of $13 million through 2019.

Shelby Disposition (GenOn)

On November 9, 2015, GenOn entered into an agreement with an affiliate of Rockland Power Partners II, LP and Shelby County Energy Center, LLC to sell the Shelby Generating Station, a 352 MW natural gas-fired facility located in Illinois for cash consideration of $46 million. At December 31, 2015, GenOn had classified on its balance sheet the assets and liabilities of Shelby as held for sale. On March 1, 2016, GenOn completed the sale of Shelby for cash proceeds of $46 million which resulted in a gain of $29 million recognized within GenOn's consolidated results of operations during the first quarter of 2016. In addition, GenOn retained $10 million related to future revenue rights as part of the agreement, which has been collected as of September 30, 2017.

XML

Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 4, Fair Value of Financial Instruments, to the Registrants' 2016 Form 10-K.

For cash and cash equivalents, restricted cash, funds deposited by counterparties, accounts receivable, accounts payable, accrued liabilities, and cash collateral posted and received in support of energy risk management activities, the carrying amounts approximate fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy.

As a result of the GenOn Entities filing for relief under Chapter 11 as further discussed in Note 3, Chapter 11 Cases, GenOn and GenOn Americas Generation's long-term debt, including current portion, are classified as liabilities subject to compromise as of September 30, 2017.

The estimated carrying amount and fair value of GenOn's long-term debt, including current portion, was $2,752 million and $1,946 million as of December 31, 2016, respectively, of which $1,850 million and $96 million was classified as Level 2 and Level 3, respectively, within the fair value hierarchy. The carrying amount and fair value of long-term debt — affiliate is $125 million as of September 30, 2017 and is classified as Level 3 within the fair value hierarchy.

The estimated carrying amount and fair value of GenOn Americas Generation's long-term debt was $745 million and $570 million as of December 31, 2016, respectively, and is classified as Level 2 within the fair value hierarchy.

The fair value of long-term debt was estimated using reported market prices for instruments that are publicly traded and are classified as Level 2 within the fair value hierarchy. The fair value of non-publicly traded debt and long-term debt — affiliate is based on the income approach valuation technique using current interest rates for similar instruments with equivalent credit quality and is classified as Level 3 within the fair value hierarchy.

Recurring Fair Value Measurements

Derivative assets and liabilities are carried at fair market value. Realized and unrealized gains and losses included in earnings that are related to energy derivatives are recorded in operating revenues and cost of operations.

GenOn

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn’s consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	56	$	—	$	56
Derivative liabilities:
Commodity contracts	$	—	$	36	$	5	$	41
Other assets (b)	$	8	$	—	$	—	$	8

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

(b) Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	122	$	2	$	124
Derivative liabilities:
Commodity contracts	$	—	$	119	$	3	$	122
Other assets (b)	$	10	$	—	$	—	$	10

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

(b) Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees.

The following table reconciles, for the three and nine months ended September 30, 2017 and 2016, the beginning and ending balances for derivatives that are recognized at fair value in GenOn's consolidated financial statements at least annually using significant unobservable inputs:

	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	(2	)	$	(11	)	$	(1	)	$	(12	)
Total (losses)/gains included in earnings — realized/unrealized	(1		)	7			(2		)	6
Purchases	(2		)	(1		)	(2		)	1
Transfers out of Level 3 (b)	—			1			—			1
Ending balance	$	(5	)	$	(4	)	$	(5	)	$	(4	)
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	5		$	(3	)	$	(3	)

(a) Consists of derivative assets and liabilities, net.

(b) Transfers out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

GenOn Americas Generation

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn Americas Generation's consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	89	$	5	$	94
Derivative liabilities:
Commodity contracts	$	—	$	88	$	6	$	94

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	209	$	5	$	214
Derivative liabilities:
Commodity contracts	$	—	$	212	$	5	$	217

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

The following table reconciles, for the three and nine months ended September 30, 2017 and 2016, the beginning and ending balances for GenOn Americas Generation's derivatives 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)
	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	1		$	—		$	1
Total losses included in earnings — realized/unrealized	(1		)	—			(1		)	(1		)
Purchases	—			(1		)	—			—
Transfers out of Level 3 (b)	—			1			—			1
Ending balance	$	(1	)	$	1		$	(1	)	$	1
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	—		$	(1	)	$	—

(a) Consists of derivative assets and liabilities, net.

(b) Transfers out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

GenOn Mid-Atlantic

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn Mid-Atlantic's consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	12	$	—	$	12
Derivative liabilities:
Commodity contracts	$	—	$	13	$	1	$	14

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	47	$	1	$	48
Derivative liabilities:
Commodity contracts	$	—	$	45	$	1	$	46

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

The following table reconciles, for the three and nine months ended September 30, 2017 and 2016, the beginning and ending balances for GenOn Mid-Atlantic's derivatives 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)
	Three months ended September 30,					Nine months ended September 30,
	2017			2016		2017			2016
	Derivatives (a)					Derivatives (a)
	(In millions)
Beginning balance	$	—		$	1	$	—		$	2
Total losses included in earnings — realized/unrealized	(1		)	—		(1		)	(1		)
Ending balance	$	(1	)	$	1	$	(1	)	$	1
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	—	$	(1	)	$	—

(a) Consists of derivative assets and liabilities, net.

Derivative Fair Value Measurements

A portion of the Registrants' contracts are exchange-traded contracts with readily available quoted market prices. A majority of the Registrants' contracts are non-exchange-traded contracts valued using prices provided by external sources, primarily price quotations available through brokers or over-the-counter and on-line exchanges. The remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available for the whole term or for certain delivery months. 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, 2017, contracts valued with prices provided by models and other valuation techniques make up 0% of GenOn's derivative assets and 12% of GenOn's derivative liabilities, 5% of GenOn Americas Generation’s derivative assets and 6% of GenOn Americas Generation's derivative liabilities and 0% of GenOn Mid-Atlantic’s derivative assets and 7% of GenOn Mid-Atlantic's derivative liabilities.

The Registrants' significant positions classified as Level 3 include financial power and physical coal executed in illiquid markets as well as financial transmission rights, or FTRs. The significant unobservable inputs used in developing fair value include illiquid power and coal location pricing, which is derived as a basis to liquid locations. The basis spread is based on observable market data when available or derived from historic prices and forward market prices from similar observable markets when not available. For FTRs, the Registrants use the most recent auction prices to derive the fair value.

The following tables quantify the significant unobservable inputs used in developing the fair value of the Registrants' Level 3 positions as of September 30, 2017 and December 31, 2016:

GenOn

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
FTRs	$	—	$	5	Discounted Cash Flow	Auction Prices (per MWh)	$	(3	)	$	1	$	—
	$	—	$	5

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29		$	59	$	43
Coal Contracts	—		1		Discounted Cash Flow	Forward Market Price (per ton)	42			51		45
FTRs	1		2		Discounted Cash Flow	Auction Prices (per MWh)	(2		)	3		—
	$	2	$	3

GenOn Americas Generation

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
FTRs	$	5	$	6	Discounted Cash Flow	Auction Prices (per MWh)	$	(3	)	$	1	$	—
	$	5	$	6

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29		$	59	$	43
Coal Contracts	1		1		Discounted Cash Flow	Forward Market Price (per ton)	42			51		45
FTRs	3		4		Discounted Cash Flow	Auction Prices (per MWh)	(2		)	3		—
	$	5	$	5

GenOn Mid-Atlantic

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low		High		Weighted Average
	(In millions)
FTRs	$	—	$	1	Discounted Cash Flow	Auction Prices (per MWh)	$	—	$	1	$	—
	$	—	$	1

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low		High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29	$	59	$	43
FTRs	—		1		Discounted Cash Flow	Auction Prices (per MWh)	—		1		—
	$	1	$	1

The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of September 30, 2017 and December 31, 2016:

Significant Unobservable Input	Position	Change In Input	Impact on Fair Value Measurement
Forward Market Price Power/Coal	Buy	Increase/(Decrease)	Higher/(Lower)
Forward Market Price Power/Coal	Sell	Increase/(Decrease)	Lower/(Higher)
FTR Prices	Buy	Increase/(Decrease)	Higher/(Lower)
FTR Prices	Sell	Increase/(Decrease)	Lower/(Higher)

The fair value of each contract is discounted using a risk free interest rate. In addition, the Registrants apply a non-performance/credit reserve to reflect credit risk which is calculated based on published default probabilities. To the extent that the Registrants' net exposure under a specific master agreement is an asset, the Registrants use the counterparty's 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 Registrants' liabilities or that a market participant would be willing to pay for the Registrants' assets. The Registrants' credit reserves were as follows:

	As of September 30, 2017		As of December 31, 2016
	(In millions)
GenOn	$	—	$	1
GenOn Americas Generation	—		1

There were no non-performance/credit reserves for GenOn Mid-Atlantic as of September 30, 2017 and December 31, 2016.

Under the guidance of ASC 815, entities may choose to offset cash collateral posted or received against the fair value of derivative positions executed with the same counterparties under the same master netting agreements. The Registrants have chosen not to offset positions as defined in ASC 815. As of September 30, 2017, GenOn recorded $72 million of cash collateral posted on its balance sheet related to fair value of derivative positions, which includes $25 million of collateral posted to NRG. As of September 30, 2017, GenOn Americas Generation recorded $70 million of cash collateral posted on its balance sheet related to fair value of derivative positions, which includes $25 million of collateral posted to NRG. As of September 30, 2017, GenOn Mid-Atlantic had no outstanding cash collateral posted or received on its balance sheet.

Concentration of Credit Risk

In addition to the credit risk discussion as disclosed in Note 2, Summary of Significant Accounting Policies, to the Registrants' 2016 Form 10-K, the following is a discussion of the concentration of credit risk for the Registrants’ financial instruments. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. The Registrants are exposed to counterparty credit risk through various activities including wholesale sales and fuel purchases.

Counterparty Credit Risk

The Registrants' counterparty credit risk policies are disclosed in their 2016 Form 10-K. As of September 30, 2017, GenOn's counterparty credit exposure was $47 million and GenOn held $0 collateral (cash and letters of credit) against those positions, resulting in a net exposure of $47 million. Approximately 94% of GenOn's exposure before collateral is expected to roll off by the end of 2018. As of September 30, 2017, GenOn Americas Generation’s counterparty credit exposure was $47 million, and GenOn Americas Generation held $0 collateral (cash and letters of credit) against those positions, resulting in a net exposure of $47 million. Approximately 94% of GenOn Americas Generation’s exposure before collateral is expected to roll off by the end of 2018. As of September 30, 2017, GenOn Mid-Atlantic had no counterparty credit exposure. The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for the Registrants with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market, NPNS and non-derivative transactions. The exposure is shown net of collateral held and includes amounts net of receivables or payables.

	Net Exposure (a) (b) (% of Total)
Category by Industry Sector	GenOn		GenOn Americas Generation		GenOn Mid-Atlantic
Utilities, energy merchants, marketers and other	100	%	100	%	—	%
Total as of September 30, 2017	100	%	100	%	—	%

	Net Exposure (a) (b) (% of Total)
Category by Counterparty Credit Quality	GenOn		GenOn Americas Generation		GenOn Mid-Atlantic
Investment grade	96	%	96	%	—	%
Non-Investment grade/Non-rated	4		4		—
Total as of September 30, 2017	100	%	100	%	—	%

(a) Counterparty credit exposure excludes transportation contracts because of the unavailability of market prices.

(b) The figures in the tables above exclude potential counterparty credit exposure related to RTOs, ISOs, registered commodity exchanges and certain long term contracts.

The Registrants have counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of their respective total net exposure discussed above. The aggregate of such counterparties' exposure was $41 million, $41 million and zero for GenOn, GenOn Americas Generation and GenOn Mid-Atlantic, respectively. Changes in hedge positions and market prices will affect credit exposure and counterparty concentration. Given the credit quality, diversification and term of the exposure in the portfolio, the Registrants do not anticipate a material impact on their financial position or results of operations from nonperformance by any of their counterparties.

RTOs and ISOs

The Registrants participate in the organized markets of CAISO, ISO-NE, MISO, NYISO and PJM, known as RTO or ISOs. Trading in these markets is approved by FERC and includes credit policies that, under certain circumstances, require that losses arising from the default of one member on spot market transactions be shared by the remaining participants. As a result, the counterparty credit risk to these markets is limited to the Registrants' applicable share of the overall market and is excluded from the above exposure.

Exchange Traded Transactions

The Registrants enter into commodity transactions on registered exchanges, notably ICE and NYMEX. These clearinghouses act as the counterparty, and transactions are subject to extensive collateral and margining requirements. As a result, these commodity transactions have limited counterparty credit risk.

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Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 5, Accounting for Derivative Instruments and Hedging Activities, to the Registrants' 2016 Form 10-K.

Energy-Related Commodities(GenOn)

As of September 30, 2017, GenOn had energy-related derivative financial instruments extending through 2019.

Volumetric Underlying Derivative Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

The following table summarizes the net notional volume buy/(sell) of the Registrants’ open derivative transactions broken out by commodity, excluding those derivatives that qualified for the NPNS exception, as of September 30, 2017 and December 31, 2016. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.

		GenOn			GenOn Americas Generation			GenOn Mid-Atlantic
		Total Volume			Total Volume			Total Volume
		As of September 30, 2017		As of December 31, 2016	As of September 30, 2017		As of December 31, 2016	As of September 30, 2017		As of December 31, 2016
Commodity	Units	(In millions)
Coal	Short Ton	2		5	1		4	1		4
Natural Gas	MMBtu	72		138	13		30	13		23
Power	MWh	(12	)	(35)	(3	)	(12)	(3	)	(11)

Fair Value of Derivative Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

The following tables summarize the fair value within the derivative instrument valuation on the balance sheet:

GenOn

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	39	$	108	$	35	$	105
Commodity contracts long-term	17		16		6		17
Total Derivatives Not Designated as Cash Flow Hedges	$	56	$	124	$	41	$	122

GenOn Americas Generation

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	69	$	180	$	71	$	185
Commodity contracts long-term	25		34		23		32
Total Derivatives Not Designated as Cash Flow Hedges	$	94	$	214	$	94	$	217

GenOn Mid-Atlantic

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	10	$	44	$	14	$	44
Commodity contracts long-term	2		4		—		2
Total Derivatives Not Designated as Cash Flow Hedges	$	12	$	48	$	14	$	46

The Registrants have elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and do not offset amounts at the counterparty master agreement level. In addition, collateral received or paid on the Registrants' derivative assets or liabilities are recorded on a separate line item on the balance sheet. The following tables summarize the offsetting of derivatives by counterparty master agreement level and collateral received or paid:

GenOn

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets	$	45		$	(15	)	$	—	$	30
Derivative assets - affiliate	11			(11		)	—		—
Derivative liabilities	(28		)	15			2		(11		)
Derivative liabilities - affiliate	(13		)	11			2		—
Total derivative instruments	$	15		$	—		$	4	$	19

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets	$	70		$	(39	)	$	—	$	31
Derivative assets - affiliate	54			(54		)	—		—
Derivative liabilities	(56		)	39			1		(16		)
Derivative liabilities - affiliate	(66		)	54			12		—
Total derivative instruments	$	2		$	—		$	13	$	15

GenOn Americas Generation

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets	$	45		$	(15	)	$	—	$	30
Derivative assets - affiliate	49			(49		)	—		—
Derivative liabilities	(28		)	15			2		(11		)
Derivative liabilities - affiliate	(66		)	49			2		(15		)
Total derivative instruments	$	—		$	—		$	4	$	4

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets	$	70		$	(39	)	$	—	$	31
Derivative assets - affiliate	144			(144		)	—		—
Derivative liabilities	(56		)	39			1		(16		)
Derivative liabilities - affiliate	(161		)	144			12		(5		)
Total derivative instruments	$	(3	)	$	—		$	13	$	10

GenOn Mid-Atlantic

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets - affiliate	$	12		$	(12	)	$	—	$	—
Derivative liabilities - affiliate	(14		)	12			—		(2		)
Total derivative instruments	$	(2	)	$	—		$	—	$	(2	)

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets - affiliate	$	48		$	(46	)	$	—	$	2
Derivative liabilities - affiliate	(46		)	46			—		—
Total derivative instruments	$	2		$	—		$	—	$	2

Impact of Derivative Instruments on the Statements of Operations (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Unrealized gains and losses associated with changes in the fair value of derivative instruments are reflected in current period earnings.

During 2016, the Registrants' underwent the process of closing out and financially settling certain open positions with counterparties. The closure and financial settlements with these counterparties were necessary to manage the increases in collateral posting requirements following rating agency downgrades and reduce expected collateral costs associated with exchange cleared hedge transactions.

The following tables summarize the pre-tax effects of economic hedges. These amounts are included within operating revenues and cost of operations.

GenOn

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	9		$	(29	)	$	7	$	(145	)
Net unrealized (losses)/gains on open positions related to economic hedges	(28		)	(68		)	9		(43		)
Total unrealized (losses)/gains	$	(19	)	$	(97	)	$	16	$	(188	)

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Revenue from operations — energy commodities	$	(23	)	$	(142	)	$	7	$	(233	)
Cost of operations	4			45			9		45
Total impact to statements of operations	$	(19	)	$	(97	)	$	16	$	(188	)

As discussed above, GenOn realized approximately $38 million due to the closure and financial settlement of all open positions with one of GenOn's counterparties during the second quarter of 2016, for which $18 million, $19 million and $1 million would have otherwise been realized during the remainder of 2016, and in 2017 and 2018, respectively. In addition, GenOn realized $98 million due to the closure and financial settlement of certain open positions with an additional counterparty during the third quarter of 2016, for which $82 million, $13 million and $3 million would have otherwise been realized in 2017, 2018, and 2019, respectively. GenOn had entered into additional transactions with NRG Power Marketing LLC and an external counterparty in order to re-hedge the positions settled with certain counterparties.

During the second quarter of 2017, GenOn realized $5 million due to the closure and financial settlement of all open positions with an additional GenOn counterparty for which $4 million and $1 million would have otherwise been realized during the remainder of 2017 and 2018, respectively. In July 2017, GenOn opened an exchange clearing account with a third party financial institution and posted $20 million of initial collateral.

GenOn Americas Generation

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	11		$	(46	)	$	2	$	(165	)
Net unrealized (losses)/gains on open positions related to economic hedges	(13		)	6			6		(23		)
Total unrealized (losses)/gains	$	(2	)	$	(40	)	$	8	$	(188	)

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Revenue from operations — energy commodities	$	(6	)	$	(75	)	$	(1	)	$	(228	)
Cost of operations	4			35			9			40
Total impact to statements of operations	$	(2	)	$	(40	)	$	8		$	(188	)

As discussed above, GenOn Americas Generation realized approximately $35 million due to the closure and financial settlement of all open positions with one of GenOn Americas Generation's counterparties during the second quarter of 2016, for which $16 million and $19 million would have otherwise been realized during the remainder of 2016 and in 2017, respectively. In addition, GenOn Americas Generation realized $50 million due to the closure and financial settlement of certain open positions with an additional counterparty during the third quarter of 2016, for which $46 million, and $4 million would have otherwise been realized in 2017, and 2018, respectively. GenOn had entered into additional transactions with NRG Power Marketing LLC and an external counterparty in order to re-hedge the positions settled with certain counterparties.

During the second quarter of 2017, GenOn Americas Generation realized $5 million due to the closure and financial settlement of all open positions with an additional GenOn Americas Generation counterparty for which $4 million and $1 million would have otherwise been realized during the remainder of 2017 and 2018, respectively. In July 2017, GenOn opened an exchange clearing account with a third party financial institution and posted $20 million of initial collateral.

GenOn Mid-Atlantic

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	7		$	(47	)	$	(3	)	$	(146	)
Net unrealized (losses)/gains on open positions related to economic hedges	(12		)	4			1			(18		)
Total unrealized losses	$	(5	)	$	(43	)	$	(2	)	$	(164	)

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Revenue from operations — energy commodities	$	(10	)	$	(83	)	$	(2	)	$	(203	)
Cost of operations	5			40			—			39
Total impact to statements of operations	$	(5	)	$	(43	)	$	(2	)	$	(164	)

As discussed above, GenOn Mid-Atlantic realized approximately $35 million due to the closure and financial settlement of all open positions with one of GenOn Mid-Atlantic's counterparties during the second quarter of 2016, for which $16 million and $19 million would have otherwise been realized during the remainder of 2016 and in 2017, respectively. In addition, GenOn Mid-Atlantic realized $50 million due to the closure and financial settlement of certain open positions with an additional counterparty during the third quarter of 2016, for which $46 million, and $4 million would have otherwise been realized in 2017, and 2018, respectively. GenOn had entered into additional transactions with NRG Power Marketing LLC and an external counterparty in order to re-hedge the positions settled with certain counterparties.

In addition, during the second quarter of 2017 GenOn Mid-Atlantic realized $5 million due to the closure and financial settlement of all open positions with an additional GenOn Mid-Atlantic counterparty for which $4 million and $1 million would have otherwise been realized during the remainder of 2017 and 2018, respectively.

Credit Risk Related Contingent Features (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Certain of GenOn and GenOn Americas Generation’s hedging agreements contain provisions that require the Registrants to post additional collateral if the counterparty determines that there has been deterioration in credit quality, generally termed "adequate assurance" under the agreements, or require the Registrants to post additional collateral if there were a one notch downgrade in the Registrants’ credit rating. The collateral required for contracts that have adequate assurance clauses that are in net liability positions as of September 30, 2017, was $1 million for GenOn and GenOn Americas Generation. As of September 30, 2017, no collateral was required for contracts with credit rating contingent features that are in a net liability position for GenOn and GenOn Americas Generation. GenOn and GenOn Americas Generation are also party to certain marginable agreements under which no collateral was due as of September 30, 2017. As of September 30, 2017, GenOn Mid-Atlantic did not have any financial instruments with credit-risk-related contingent features.

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

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Impairments (GenOn)

9 Months Ended

Sep. 30, 2017

Asset Impairment Charges [Abstract]

Impairments (GenOn)

Impairments (GenOn)

2016 Long-Lived Asset Impairments (GenOn)

Mandalay and Ormond Beach (GenOn) — On May 26, 2016, the CPUC rejected a multi-year resource adequacy contract between Mandalay and Southern California Edison. Also occurring during the second quarter of 2016, the Statewide Advisory Committee on Cooling Water Intake Structures, or SACCWIS, issued a draft April 2016 Report noting that CAISO plans to continue to assume in its transmission studies that Ormond Beach will not operate after December 31, 2020, the deadline for Ormond Beach compliance with California regulations to mitigate once-through cooling (OTC) impacts. GenOn does not anticipate that contracts of sufficient value can be secured to support the significant investment required to design, permit, construct and operate measures required for OTC compliance. As a result, on May 6, 2016, GenOn notified SACCWIS that it does not expect to continue to operate Ormond Beach beyond 2020. Additionally, during the second quarter of 2016, CAISO issued its Local Capacity Requirements report for 2017 indicating unfavorable changes within the local reliability areas in which both Mandalay and Ormond Beach are located. The culmination of these events were considered to be indicators of impairment and as a result, GenOn performed impairment tests for the Mandalay and Ormond Beach assets under ASC 360, Property, Plant and Equipment. Based on the results of the impairment tests, GenOn determined that the carrying amount of these assets was higher than the estimated future net cash flows expected to be generated by the respective assets and that the Mandalay and Ormond Beach assets were impaired. The fair value of the Mandalay and Ormond Beach operating units was determined using the income approach which utilizes estimates of discounted future cash flows, which were Level 3 fair value measurements and include key inputs such as forecasted contract prices, forecasted operating expenses and discount rates. GenOn measured the impairment losses as the difference between the carrying amount of the Mandalay and Ormond Beach operating units and the present value of the estimated future net cash flows for each respective operating unit. GenOn recorded an impairment loss of $16 million and $43 million for Mandalay and Ormond Beach, respectively, during the quarter ended June 30, 2016.

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Debt and Capital Leases (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt and Capital Leases (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

Debt and Capital Leases (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

Long-term debt and capital leases consisted of the following:

(In millions, except rates)	September 30, 2017			December 31, 2016		September 30, 2017 interest rate %
GenOn Americas Generation:
GenOn Americas Generation Senior Notes, due 2021	$	366		$	366	8.500
GenOn Americas Generation Senior Notes, due 2031	329			329		9.125
Premiums (a)	—			50
Less: Liabilities subject to compromise	(695		)	—
Subtotal GenOn Americas Generation	—			745
GenOn Energy:
GenOn Senior Notes, due 2017	691			691		7.875
GenOn Senior Notes, due 2018	649			649		9.500
GenOn Senior Notes, due 2020	490			490		9.875
Other liabilities (b)	91			96
GenOn capital lease	2			2
Premiums (a)	—			81
Less: Liabilities subject to compromise	(1,921		)	—
Subtotal GenOn Energy	2			2,009
Subtotal	2			2,754
Less: current maturities	1			704
Total long-term debt and capital leases	$	1		$	2,050

(a)    Premiums were written-off at Petition Date in accordance with ASC 852, Reorganizations.

(b)    Debt financing liabilities associated with the Long Term Service Agreements for the Choctaw and Hunterstown facilities.

Letter of Credit Facility

As part of the Restructuring Support Agreement, NRG agreed to provide GenOn with a letter of credit facility during the pendency of the Chapter 11 Cases, which could be utilized for required letters of credit in lieu of the Intercompany Revolver. On July 27, 2017, the letter of credit facility was terminated. See Note 10, Related Party Transactions, for further discussion.

On July 14, 2017, the GenOn Entities obtained a letter of credit facility with a third party financial institution to finance the working capital needs and for general corporate purposes. The letter of credit facility provides availability of up to $300 million less amounts borrowed, and letters of credit provided are required to be cash collateralized at 101% of the letter of credit amount. As of September 30, 2017, there was $6 million of letters of credit issued under this letter of credit facility.

GenOn Mid-Atlantic Long-Term Deposits

On January 27, 2017, GenOn Mid-Atlantic entered into an agreement with Natixis Funding Corp., or Natixis, under which Natixis will procure payment and credit support for the payment of certain lease payments owed pursuant to the GenOn Mid-Atlantic operating leases for Morgantown and Dickerson, or the Natixis Agreement. GenOn Mid-Atlantic made a payment of $130 million plus fees of $1 million as consideration for Natixis applying for the issuance of, and obtaining, letters of credit from Natixis, New York Branch, the LC Provider, to support the lease payments. Natixis is solely responsible for (i) obtaining letters of credit from the LC Provider, (ii) causing the letters of credit to be issued to the lessors to support the lease payments on behalf of GenOn Mid-Atlantic, (iii) making lease payments and (iv) satisfying any reimbursement obligations payable to the LC Provider. The payment was accounted for as a long-term deposit on the Registrants' consolidated balance sheets prior to June 30, 2017, reflecting the deferred benefit to GenOn Mid-Atlantic of its contractual rights under the Natixis Agreement, including lease payments Natixis has agreed to make thereunder, and notwithstanding that GenOn Mid-Atlantic had made an irrevocable payment to Natixis.

In letters dated February 24, 2017, GenOn Mid-Atlantic received a series of notices from certain of the owner lessors under its operating leases of the Morgantown coal generation units, or Notices, alleging default. The Notices allege the existence of lease events of default as a result of, among other items, the purported failure by GenOn Mid-Atlantic to comply with a covenant requiring the maintenance of qualifying credit support. The Notices instructed the relevant trustees to draw on letters of credit under the secured intercompany revolving credit agreement between NRG and GenOn as further described in Note 10, Related Party Transactions, to support the GenOn Mid-Atlantic operating leases that were set to expire on February 28, 2017. On February 28, 2017, the trustees drew on the letters of credit under NRG's revolving credit facility, which resulted in borrowings of $125 million. Upon notification, GenOn became obligated under the Intercompany Revolver. In addition, a corresponding payable was recorded by GenOn Mid-Atlantic to GenOn, with the offset recorded as a long-term deposit on the Registrants' consolidated balance sheets as of March 31, 2017 under the related operating leases. GenOn requested GenOn Mid-Atlantic repay the related amount borrowed under the Intercompany Revolver. On May 5, 2017, GenOn Mid-Atlantic repaid $125 million to GenOn.

GenOn Mid-Atlantic disagrees with the owner lessors as to the existence of any lease events of default and/or any breaches by GenOn Mid-Atlantic of any terms and conditions of the operating leases and believes that the declaration of a lease event of default, the instruction to draw on the letters of credit, and the draws thereon constituted a violation by the owner lessors and the relevant trustees of the terms and conditions of the GenOn Mid-Atlantic operating leases. GenOn Mid‑Atlantic has been vigorously pursuing its rights and remedies in connection with these actions. On March 7, 2017, GenOn Mid-Atlantic filed a complaint in the Supreme Court for the State of New York against the owner lessors of the Morgantown and Dickerson facilities and U.S. Bank, N.A., or U.S. Bank, in its capacity as the indenture trustee, the GenOn Mid-Atlantic Complaint. The GenOn Mid-Atlantic Complaint seeks, inter alia, a declaratory judgment that no lease events of default exist and asserts counts for breach of contract, conversion, tortious interference, breach of the implied covenant of good faith and fair dealing, unjust enrichment, constructive trust, and injunctive relief. On June 8, 2017, the owner lessors filed a complaint in the Supreme Court for the State of New York against GenOn Mid‑Atlantic and certain of its affiliates, including GenOn and NRG, the Owner Lessor Complaint. The Owner Lessor Complaint asserts ten counts for various fraudulent transfer, contract, and other claims and seeks hundreds of millions of dollars in damages.

On June 28, 2017, GenOn Mid-Atlantic directed U.S. Bank in its capacity as the indenture trustee, to apply the $125 million that had been drawn on the letters of credit under NRG's revolving credit facility to the June 30 rent obligations related to the operating leases. In addition, GenOn Mid-Atlantic paid $2.7 million to the owner lessors, which, together with the $125 million, would satisfy the June 30 rent obligations. The owner lessors notified U.S. Bank that the $125 million was to be held pending the outcome of the GenOn Mid-Atlantic Complaint, and that GenOn Mid‑Atlantic must instead satisfy its rent obligations solely from available cash. In response, GenOn Mid-Atlantic again directed U.S. Bank to apply the same $125 million to the June 30 rent obligations. On June 30, 2017, U.S. Bank drew on the Natixis Agreement in the amount of $125 million in order to satisfy the remaining June 30 rent obligation. At such time, GenOn Mid-Atlantic transferred $125 million of the amount paid under the Natixis Agreement to prepaid rent - non-current in its consolidated balance sheet. GenOn Mid-Atlantic disputes that the draw on the Natixis Agreement was proper. The owner lessors dispute that the June 30 rent obligations were satisfied, stating that they have only received the $2.7 million.

On July 6 and 7, 2017, GenOn Mid-Atlantic received notices from certain owner lessors under its operating leases of the Dickerson coal generation units, or the Dickerson Notices. The Dickerson Notices allege the existence of lease events of default as a result of, among other items, the purported failure by GenOn Mid-Atlantic to comply with a covenant requiring the maintenance of qualifying credit support. GenOn Mid-Atlantic disputes that there is a lease event of default related to the Natixis Agreement. On July 31, 2017, and pursuant to an agreement reached between GenOn Mid-Atlantic, the owner lessors and certain holders of pass-through certificates, the proceeds of the draw on the Natixis Agreement were applied by the trustee to the June 30 rent payment and distributed to the holders of the pass through certificates of the Morgantown facility pursuant to the waterfall applicable in a “no default” scenario.

GenOn Mid-Atlantic entered into a limited waiver agreement with U.S. Bank as lease indenture trustee and pass through trustee, the owner lessors, the owner participants and certain consenting certificateholders under the Morgantown operating leases, pursuant to which all such parties agreed to waive the requirement that GenOn Mid-Atlantic reinstate the availability of any drawn qualifying credit support under any lease agreement for the Morgantown coal generation unit. The limited waiver agreement became effective on September 30, 2017 and will remain in effect until the earlier of (i) November 22, 2017 and (ii) 10 business days after a decision or order is issued in the Debtors’ Motion to Estimate the Owner Lessor Plaintiffs’ Claims and Expedited Motion to Establish Related Schedule [Docket No. 128], pending in the Chapter 11 Cases of the GenOn Entities in the United States Bankruptcy Court for the Southern District of Texas, jointly administered under the lead case caption In re GenOn Energy, Inc., Case No. 17-33695 (DRJ).

In connection with the letters of credit issued pursuant to the Natixis Agreement, the LC Provider delivered notices of termination, dated October 26, 2017, of its intent to terminate such letters of credit as of December 27, 2017. Pursuant to the operative documents governing the leases of the Morgantown and Dickerson coal generation units and the letters of credit, the issuer of the letters of credit may terminate such letters of credit by providing 60 days prior written notice to the holders thereof, among other parties. Pursuant to the same operative documents, GenOn Mid-Atlantic must provide alternative qualifying credit support no later than 30 days prior to the intended termination date of the letters of credit subject to termination. GenOn Mid-Atlantic intends to vigorously pursue all rights and claims available to it against any person in connection with the termination of the letters of credit by the LC Provider and the resulting replacement of qualifying credit support.

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Income Taxes (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Income Taxes (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

GenOn

GenOn’s income tax expense consisted of the following:

	Three months ended September 30,						Nine months ended September 30,
(In millions except otherwise noted)	2017			2016			2017			2016
Income before income taxes	$	72		$	284		$	49		$	268
Income tax expense	—			21			7			20
Effective tax rate	—		%	7.4		%	14.3		%	7.5		%

For the three months ended September 30,2017, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance.

For the nine months ended September 30, 2017, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance, partially offset by the impact of state income taxes.

For the three and nine months ended September 30, 2016, GenOn's overall effective tax rate was different than the statutory rate of 35% primarily due to a change in the valuation allowance, offset by the impact of state income taxes associated with the disposition of generating stations during the year.

GenOn Americas Generation

GenOn Americas Generation's allocated income taxes resulting from its operations for the three and nine months ended September 30,2017 and 2016 was zero. GenOn Americas Generation's pro forma income taxes resulting from its operations for the three and nine months ended September 30,2017 and 2016 was zero due to the valuation allowance recorded on its stand-alone financial results.

GenOn Mid-Atlantic

GenOn Mid-Atlantic’s allocated income taxes resulting from its operations for the three and nine months ended September 30,2017 and 2016 was zero. GenOn Mid-Atlantic’s pro forma income taxes resulting from its operations was zero and a tax expense of $23 million during the three months ended September 30, 2017 and 2016, respectively. The pro forma income tax provision attributable to income before taxes was zero and a tax expense of $25 million during the nine months ended September 30, 2017 and 2016, respectively.

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Related Party Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Related Party Transactions [Abstract]

Related Party Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Related Party Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Services Agreement with NRG

NRG provides GenOn with various management, personnel and other services, which include human resources, regulatory and public affairs, accounting, tax, legal, information systems, treasury, risk management, commercial operations, and asset management, as set forth in the services agreement with NRG, or the Services Agreement. The initial term of the Services Agreement was through December 31, 2013, with an automatic renewal absent a request for termination. The fee charged was determined based on a fixed amount as described in the Services Agreement and was calculated based on historical GenOn expenses prior to the NRG Merger. The annual fees under the Services Agreement were approximately $193 million. As described in Note 3, Chapter 11 Cases, in connection with the Restructuring Support Agreement, NRG agreed to provide shared services to GenOn under the Services Agreement for an adjusted annualized fee of $84 million through the pendency of the Chapter 11 Cases. Subsequent to the GenOn Entities’ emergence from bankruptcy, NRG will provide shared services for two months at no charge; after which GenOn has an additional two, one-month options to provide services at the annualized fee of $84 million. NRG charges these fees on a monthly basis, less amounts incurred directly by GenOn. For the three and nine months ended September 30, 2017, GenOn recorded costs related to these services of $14 million and $100 million, respectively, as general and administrative — affiliate. For the three and nine months ended September 30, 2016, GenOn recorded costs related to these services of $46 million and $139 million, respectively, as general and administrative — affiliate.

In addition, under the Restructuring Support Agreement, NRG has agreed to provide GenOn with a $28 million credit against amounts owed to NRG prior to the Petition Date under the current Services Agreement. As of June 30, 2017, GenOn recorded a receivable from NRG for this $28 million. Such amount was intended to reimburse GenOn for costs incurred in connection with the 2022 Notes that were not assumed. Accordingly, GenOn removed the previously deferred costs in the amount of $28 million and recorded a receivable from NRG for this amount. The receivable is reflected net in accounts payable - affiliate on the consolidated balance sheet as of September 30, 2017. In addition, the Restructuring Support Agreement provides that to the extent GenOn has paid for services during the bankruptcy proceedings and the aforementioned credit has not been applied in full, NRG shall, upon request by GenOn, reimburse such payments in cash up to the amount of any unused portion of the credit.

Under the Services Agreement, NRG also provides GenOn Americas Generation and GenOn Mid-Atlantic with various management, personnel and other services consistent with those set forth in the Services Agreement discussed above between NRG and GenOn. GenOn's costs incurred under the Services Agreement with NRG are allocated to its subsidiaries based on each operating subsidiary's planned operating expenses relative to all operating subsidiaries of GenOn. These allocations and charges are not necessarily indicative of what would have been incurred had GenOn Americas Generation and GenOn Mid-Atlantic been unaffiliated entities. Management has concluded that this method of charging overhead costs is reasonable.

The following costs were incurred under these arrangements:

GenOn Americas Generation

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017			2016
	(In millions)
Allocated costs:
Cost of operations — affiliate	$	—	$	—	$	(1	)	$	2
General and administrative — affiliate	9		21		53			62
Total	$	9	$	21	$	52		$	64

GenOn Mid-Atlantic

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017		2016
	(In millions)
Allocated costs:
Cost of operations — affiliate	$	1	$	1	$	2	$	2
General and administrative — affiliate	4		15		42		45
Total	$	5	$	16	$	44	$	47

Credit Agreement with NRG (GenOn)

GenOn and NRG Americas, Inc. are party to a secured intercompany revolving credit agreement with NRG, or the Intercompany Revolver.  The Intercompany Revolver provided for a $500 million revolving credit facility, all of which was available for revolving loans and letters of credit. At September 30, 2017 and December 31, 2016, $103 million and $272 million, respectively, of letters of credit were issued and outstanding under the NRG credit agreement for GenOn. Of this amount, $21 million and $199 million were issued on behalf of GenOn Americas Generation as of September 30, 2017 and December 31, 2016, respectively, which includes $1 million and $128 million issued on behalf of GenOn Mid-Atlantic as of September 30, 2017 and December 31, 2016, respectively. Additionally, as of September 30, 2017, there were $125 million loans outstanding under the Intercompany Revolver, which is recorded as long-term debt - affiliate on the balance sheet, as further described in Note 8, Debt and Capital Leases. As of December 31, 2016, no loans were outstanding under this Intercompany Revolver.  Certain of GenOn's subsidiaries, as guarantors, entered into a guarantee agreement pursuant to which these guarantors guaranteed amounts borrowed and obligations incurred under the credit agreement. The guarantors are restricted from incurring additional liens on certain of their assets. In addition, the Intercompany Revolver contains customary covenants and events of default. As of September 30, 2017, GenOn was in default under the Intercompany Revolver with NRG due to the filing of the Chapter 11 Cases.

As a result of the Chapter 11 Cases, no additional revolving loans or letters of credit are available to GenOn under the Intercompany Revolver. In addition, NRG agreed to provide GenOn with a letter of credit facility during the pendency of the Chapter 11 Cases, which could be utilized for required letters of credit in lieu of the Intercompany Revolver. The letter of credit facility provided availability of up to $330 million less amounts borrowed and letters of credit provided were required to be cash collateralized at 103% of the letter of credit amount. On July 27, 2017, this letter of credit facility was terminated as GenOn has obtained a separate letter of credit facility with a third party financial institution, as discussed in Note 8, Debt and Capital Leases. Effective with completion of the reorganization, GenOn must repay NRG for all revolving loans outstanding, with such amount to be netted against the settlement payment owed from NRG to GenOn. Interest continues to accrue during the pendency of the Chapter 11 Cases and borrowings remain secured obligations.

Intercompany Cash Management Program (GenOn Americas Generation)

GenOn Americas Generation and certain of its subsidiaries participate in separate intercompany cash management programs whereby cash balances at GenOn Americas Generation and the respective participating subsidiaries are transferred to central concentration accounts to fund working capital and other needs of the respective participants. The balances under this program are reflected as notes receivable — affiliate and accounts receivable — affiliate or notes payable — affiliate and accounts payable — affiliate, as appropriate. The balances are due on demand and notes receivable — affiliate andnotes payable — affiliateaccrue interest on the net position, which is payable quarterly, at a rate determined by GenOn Energy Holdings, a wholly owned subsidiary of GenOn. These arrangements have continued in the normal course of business through the pendency of the Chapter 11 Cases. At September 30, 2017 and December 31, 2016, GenOn Americas Generation had a net current note receivable — affiliate from GenOn Energy Holdings of $318 million and $315 million, respectively, related to its intercompany cash management program. For the nine months endedSeptember 30, 2017 and 2016, GenOn Americas Generation earned an insignificant amount of net interest income related to these notes. Additionally, at September 30, 2017 and December 31, 2016, GenOn Americas Generation had an accounts receivable — affiliate of $50 million and an accounts payable — affiliate of $43 million, respectively, with GenOn Energy Holdings related to the intercompany cash management programs.

Intercompany Hedging Agreements with NRG

Under intercompany agreements, NRG Power Marketing LLC may from time to time enter into physical and financial intercompany commodity and hedging transactions with GenOn and certain of its subsidiaries. Subject to applicable collateral thresholds, these arrangements may provide for the bilateral exchange of credit support based upon market exposure and potential market movements. The terms and conditions of the agreements are generally consistent with industry practices and other third party arrangements. As of September 30, 2017, GenOn has no net exposure under these arrangements.

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Commitments and Contingencies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Commitments and Contingencies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 14, Commitment and Contingencies, to the Registrants' 2016 Form 10-K.

Contingencies

The Registrants’ material legal proceedings are described below. The Registrants believe that they have valid defenses to these legal proceedings and intend to defend them vigorously. The Registrants record reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. As applicable, the Registrants believe they have established an adequate reserve for the matters discussed below. In addition, legal costs are expensed as incurred. Management has assessed each of the following matters based on current information and made a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. Unless specified below, the Registrants are unable to predict the outcome of these legal proceedings or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Registrants’ liabilities and contingencies could be at amounts that are different from their currently recorded reserves and that such difference could be material.

In addition to the legal proceedings noted below, the Registrants are parties to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect the Registrants’ respective consolidated financial position, results of operations, or cash flows.

GenOn Chapter 11 Cases (GenOn and GenOn Americas Generation) — On the Petition Date, the GenOn Entities filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code in the Bankruptcy Court. As a result of such bankruptcy filings, substantially all proceedings pending against the GenOn Entities have been stayed by operation of Section 362(a) of the Bankruptcy Code. Under the Restructuring Support Agreement to which the GenOn Entities, NRG and certain of GenOn's and GenOn Americas Generation's senior unsecured noteholders are parties, each of them has agreed to support Bankruptcy Court approval of the Plan. GenOn has a customary "fiduciary out" under the Restructuring Support Agreement. Moreover, the Bankruptcy Court may not approve the Plan. If the Plan is not approved and consummated, GenOn may not be entitled to the benefits of the Settlement Agreement provided under the Restructuring Support Agreement and it will remain subject to any claims of NRG and the noteholders, including claims relating to or arising out of any shared services and any other relationships or transactions between the companies. See Note 3, Chapter 11 Cases, for additional information. The GenOn Entities are in the process of evaluating claims submitted in connection with the Chapter 11 Cases to determine the validity of such claims but has not yet finished their assessment of valid claims and are currently unable to determine the amount of such claims.

Actions Pursued by MC Asset Recovery (GenOn) — With Mirant Corporation's emergence from bankruptcy protection in 2006, certain actions filed by GenOn Energy Holdings and some of its subsidiaries against third parties were transferred to MC Asset Recovery, a wholly owned subsidiary of GenOn Energy Holdings.  MC Asset Recovery is governed by a manager who is independent of NRG and GenOn.  MC Asset Recovery is a disregarded entity for income tax purposes. Under the remaining action transferred to MC Asset Recovery, MC Asset Recovery seeks to recover damages from Commerzbank AG and various other banks, or the Commerzbank Defendants, for alleged fraudulent transfers that occurred prior to Mirant's bankruptcy proceedings.  In December 2010, the U.S. District Court for the Northern District of Texas dismissed MC Asset Recovery's complaint against the Commerzbank Defendants.  In January 2011, MC Asset Recovery appealed the District Court's dismissal of its complaint against the Commerzbank Defendants to the U.S. Court of Appeals for the Fifth Circuit, or the Fifth Circuit.  In March 2012, the Fifth Circuit reversed the District Court's dismissal and reinstated MC Asset Recovery's amended complaint against the Commerzbank Defendants. On December 10, 2015, the District Court granted summary judgment in favor of the Commerzbank Defendants. On December 29, 2015, MC Asset Recovery filed a notice to appeal this judgment with the Fifth Circuit. On June 1, 2017, the Fifth Circuit affirmed the District Court's judgment. On June 12, 2017, MC Asset Recovery petitioned the Fifth Circuit for rehearing. The petition for rehearing was denied and a court order and judgment affirming the District Court's judgments was entered on July 17, 2017. On January 17, 2018, the bankruptcy court will hear a Motion for a Final Decree in the Mirant bankruptcy.

Natural Gas Litigation (GenOn)— GenOn is party to several lawsuits, certain of which are class action lawsuits, in state and federal courts in Kansas, Missouri, Nevada and Wisconsin. These lawsuits were filed in the aftermath of the California energy crisis in 2000 and 2001 and the resulting FERC investigations and relate to alleged conduct to increase natural gas prices in violation of state antitrust law and similar laws. The lawsuits seek treble or punitive damages, restitution and/or expenses. The lawsuits also name as parties a number of energy companies unaffiliated with NRG. In July 2011, the U.S. District Court for the District of Nevada, which was handling four of the five cases, granted the defendants' motion for summary judgment and dismissed all claims against GenOn in those cases. The plaintiffs appealed to the U.S. Court of Appeals for the Ninth Circuit, or the Ninth Circuit, which reversed the decision of the District Court. GenOn along with the other defendants in the lawsuit filed a petition for a writ of certiorari to the U.S. Supreme Court challenging the Ninth Circuit's decision and the U.S. Supreme Court granted the petition. On April 21, 2015, the U.S. Supreme Court affirmed the Ninth Circuit’s holding that plaintiffs’ state antitrust law claims are not field-preempted by the federal Natural Gas Act and the Supremacy Clause of the U.S. Constitution. The U.S. Supreme Court left open whether the claims were preempted on the basis of conflict preemption. The U.S. Supreme Court directed that the case be remanded to the U.S. District Court for the District of Nevada for further proceedings. On March 7, 2016, class plaintiffs filed their motions for class certification. Defendants filed their briefs in opposition to class plaintiffs' motions for class certification on June 24, 2016. On March 30, 2017, the court denied the plaintiffs' motions for class certification. On April 13, 2017, the plaintiffs petitioned the Ninth Circuit for interlocutory review of the court’s order denying class certification. On June 13, 2017, the Ninth Circuit granted plaintiffs' petition for interlocutory review.

In May 2016 in one of the Kansas cases, the U.S. District Court for the District of Nevada granted the defendants' motion for summary judgment. Subsequently in December 2016, the plaintiffs filed a notice of appeal with the Ninth Circuit. The appeal has been fully briefed by the parties. GenOn has agreed to indemnify CenterPoint against certain losses relating to these lawsuits.

In September 2012, the State of Nevada Supreme Court, which was handling the remaining case, affirmed dismissal by the Eighth Judicial District Court for Clark County, Nevada of all plaintiffs' claims against GenOn. In February 2013, the plaintiffs in the Nevada case filed a petition for a writ of certiorari to the U.S. Supreme Court. In June 2013, the U.S. Supreme Court denied the petition for a writ of certiorari, thereby ending one of the five lawsuits.

Mirant Chapter 11 Proceedings (GenOn and GenOn Americas Generation)— In July 2003, and various dates thereafter, the Mirant Debtors filed voluntary petitions in the U.S. Bankruptcy Court for the Northern District of Texas, Fort Worth Division, for relief under Chapter 11 of the Bankruptcy Code. GenOn Energy Holdings and most of the other Mirant Debtors emerged from bankruptcy on January 3, 2006, when the plan of reorganization that was approved in conjunction with Mirant Corporation's emergence from bankruptcy protection, or the Mirant Plan, became effective. The remaining Mirant Debtors emerged from bankruptcy on various dates in 2007. Approximately 461,000 of the shares of GenOn Energy Holdings common stock to be distributed under the Mirant Plan have not yet been distributed and have been reserved for distribution with respect to claims disputed by the Mirant Debtors that have not been resolved. Upon the Mirant/RRI Merger, those reserved shares converted into a reserve for approximately 1.3 million shares of GenOn common stock. Upon the NRG Merger, those reserved shares converted into a reserve for approximately 159,000 shares of NRG common stock. Under the terms of the Mirant Plan, upon the resolution of such a disputed claim, the claimant will receive the same pro rata distributions of common stock, cash, or both as previously allowed claims, regardless of the price at which the common stock is trading at the time the claim is resolved. If the aggregate amount of any such payouts results in the number of reserved shares being insufficient, additional shares of common stock may be issued to address the shortfall. On January 17, 2018, the bankruptcy court will hear a Motion for a Final Decree in the Mirant Bankruptcy.

Potomac River Environmental Investigation (GenOn Mid-Atlantic) — In March 2013, NRG Potomac River LLC, a subsidiary of GenOn Mid-Atlantic, received notice that the District of Columbia Department of Environment (now renamed the Department of Energy and Environment, or DOEE) was investigating potential discharges to the Potomac River originating from the Potomac River Generating facility site, a site where the generation facility is no longer in operation. In connection with that investigation, DOEE served a civil subpoena on NRG Potomac River LLC requesting information related to the site and potential discharges occurring from the site.  NRG Potomac River LLC provided various responsive materials.  In January 2016, DOEE advised NRG Potomac River LLC that DOEE believed various environmental violations had occurred as a result of discharges DOEE believes occurred to the Potomac River from the Potomac River Generating facility site and as a result of associated failures to accurately or sufficiently report such discharges.  DOEE has indicated it believes that penalties are appropriate in light of the violations.  NRG Potomac River LLC is currently reviewing the information provided by DOEE.

GenOn Noteholders' Lawsuit (GenOn and GenOn Americas Generation) —On December 13, 2016, certain indenture trustees for an ad hoc group of holders, or the Noteholders, of the GenOn Energy, Inc. 7.875% Senior Notes due 2017, 9.500% Notes due 2018, and 9.875% Notes due 2020, and the GenOn Americas Generation, LLC 8.50% Senior Notes due 2021 and 9.125% Senior Notes due 2031, along with certain of the Noteholders, filed a complaint in the Superior Court of the State of Delaware against NRG and GenOn alleging certain claims related to a services agreement between NRG and GenOn. Plaintiffs generally seek recovery of all monies paid under the services agreement and any other damages that the court deems appropriate. On February 3, 2017, the court entered an order approving a Standstill Agreement whereby the parties agreed to suspend all deadlines in the case until March 1, 2017. The Standstill Agreement terminated on March 1, 2017. On April 30, 2017, the Noteholders filed an amended complaint that asserts (i) additional fraudulent transfer claims in relation to GenOn’s sale of the Marsh Landing project to NRG Yield LLC, (ii) alleged breaches of fiduciary duty by certain current and former officers and directors of GenOn in relation to the management services agreement and the alleged usurpation of corporate opportunities concerning the Mandalay and Canal projects and (iii) claims against NRG for allegedly aiding and abetting such claimed breaches of fiduciary duties. In addition to NRG and GenOn, the amended complaint names NRG Yield LLC and certain current and former officers and directors of GenOn as defendants. The plaintiffs generally seek recovery of all monies paid under the services agreement and any other damages that the court deems appropriate. On March 31, 2017, NRG and GenOn filed separate motions to dismiss the complaint, but such motions are superseded by the amended complaint. Pursuant to the terms of the Restructuring Support Agreement, this matter should ultimately be resolved if the GenOn Entities' plan of reorganization is approved by the Bankruptcy Court.

Rice v. NRG — On April 14, 2017, plaintiffs filed a purported class action lawsuit in the U.S. District Court for the Western District of Pennsylvania against NRG, First Energy Corporation and Matt Canastrale Contracting, Inc.  Plaintiffs generally claim personal injury, trespass, nuisance and property damage related to the disposal of coal ash from GenOn's Elrama Power Plant and First Energy’s Mitchell and Hatfield Power Plants. Plaintiffs generally seek monetary damages, medical monitoring and remediation of their property. Plaintiffs filed an amended complaint on August 14, 2017.

Morgantown v. GenOn Mid-Atlantic — On June 8, 2017, Morgantown and Dickerson Owner Lessors filed a lawsuit against GenOn Mid-Atlantic, LLC, NRG North America LLC, GenOn Americas Generation, LLC, NRG Americas, Inc., GenOn Energy Holdings, Inc., GenOn Energy, Inc., and NRG Energy, Inc. in New York State Supreme Court. The plaintiffs allege that they were overcharged by defendants for certain services outlined in a Services Agreement and that defendants caused a Qualified Credit Support portion of a Participation Agreement, or QCS Agreement, to be violated by causing the transfer of certain monies outside the allowable confines set forth in the QCS Agreement. In addition, plaintiffs claim that the transfers were unfairly executed and done so in an effort to defraud plaintiffs and hinder their ability to continue to do business. As such, plaintiffs seek, among other things, the return of certain transferred funds and service charges paid and to bar defendants from executing additional transfers on plaintiffs’ behalf. A claims estimation ruling on this matter by the Bankruptcy Court could occur as early as November 7, 2017.

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Regulatory Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Regulated Operations [Abstract]

Regulatory Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Regulatory Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 15, Regulatory Matters, to the Registrants' 2016 Form 10-K.

The Registrants operate in a highly regulated industry and are subject to regulation by various federal and state agencies. As such, the Registrants are affected by regulatory developments at both the federal and state levels and in the regions in which they operate. In addition, the Registrants are subject to the market rules, procedures, and protocols of the various ISO and RTO markets in which they participate. These power markets are subject to ongoing legislative and regulatory changes that may impact the Registrants' wholesale business.

In addition to the regulatory proceedings noted below, the Registrants are parties to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect the Registrants’ respective consolidated financial position, results of operations, or cash flows.

National

Zero-Emission Credits for Nuclear Plants in Illinois — In 2016, Illinois enacted a Zero Emission Credit, or ZEC, program for selected nuclear units in Illinois. In total, the program directs over $2.5 billion over ten years to nuclear plants in Illinois that would otherwise retire. Pursuant to the legislation, the Illinois Power Agency, or IPA, conducts a competitive solicitation to procure ZECs, although both the Governor of Illinois and Exelon have already announced that the ZECs will be awarded to two Exelon-owned nuclear power plants in Illinois.  These ZECs are out-of-market subsidies that threaten to artificially suppress market prices and interfere with the wholesale power market. On February 14, 2017, NRG, along with other companies, filed a complaint in the U.S. District Court for the Northern District of Illinois alleging that the state program is preempted by federal law and in violation of the dormant commerce clause. Another plaintiff group filed a similar complaint on the same day.Subsequently, on March 31, 2017, NRG, along with other companies, filed a motion for preliminary injunction. On April 10, 2017, Exelon, as an intervenor defendant, and State defendants filed motions to dismiss. On July 14, 2017, Defendants' motions to dismiss were granted. On July 17, 2017, NRG, along with other companies, filed a notice of appeal to the U.S. Court of Appeals for the Seventh Circuit. On July 18, 2017, the Court of Appeals issued an order setting an expedited briefing schedule for the matter. Briefing is underway.

Zero-Emission Credits for Nuclear Plants in New York — On August 1, 2016, the NYSPSC issued its Clean Energy Standard, or CES, which provided for ZECs which would provide more than $7.6 billion over 12 years in out-of-market subsidy payments to certain selected nuclear generating units in the state. These ZECs are out-of-market subsidies that threaten to artificially suppress market prices and interfere with the wholesale power market. On October 19, 2016, NRG, along with other companies, filed a complaint in the U.S. District Court for the Southern District of New York, challenging the validity of the NYSPSC action and the ZEC program. On March 29, 2017, the U.S. District Court heard oral arguments on a motion to dismiss filed by defendants. On July 25, 2017, the defendants' motions to dismiss were granted. On August 24, 2017, NRG, along with other companies, filed a notice of appeal to the U.S. Court of Appeals for the Second Circuit. On September 9, 2017, the Court of Appeals issued a briefing schedule. Briefing is underway.

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Environmental Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

9 Months Ended

Sep. 30, 2017

Environmental Remediation Obligations [Abstract]

Environmental Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

Environmental Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 16, Environmental Matters, to the Registrants' 2016 Form 10-K.

The Registrants are subject to a wide range of environmental laws in the development, construction, ownership and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and during operation of power plants. The electric generation industry has been facing requirements regarding GHGs, combustion byproducts, water discharge and use, and threatened and endangered species that have been put in place in recent years. However, under the current U.S. presidential administration some of these rules are being reconsidered and reviewed. In general, future laws are expected to require the addition of emissions controls or other environmental controls or to impose certain restrictions on the operations of the Registrants' facilities, which could have a material effect on the Registrants' respective consolidated financial position, results of operations, or cash flows. Federal and state environmental laws generally have become more stringent over time, although this trend could slow or pause in the near term with respect to federal laws under the current U.S. presidential administration.

The EPA finalized CSAPR in 2011, which was intended to replace CAIR in January 2012, to address certain states' obligations to reduce emissions so that downwind states can achieve federal air quality standards. In December 2011, the D.C. Circuit stayed the implementation of CSAPR and then vacated CSAPR in August 2012 but kept CAIR in place until the EPA could replace it. In April 2014, the U.S. Supreme Court reversed and remanded the D.C. Circuit's decision. In October 2014, the D.C. Circuit lifted the stay of CSAPR. In response, the EPA in November 2014 amended the CSAPR compliance dates. Accordingly, CSAPR replaced CAIR on January 1, 2015. On July 28, 2015, the D.C. Circuit held that the EPA had exceeded its authority by requiring certain reductions that were not necessary for downwind states to achieve federal standards. Although the D.C. Circuit kept the rule in place, the court ordered the EPA to revise the Phase 2 (or 2017) (i) SO₂ budgets for four states and (ii) ozone-season NO_x budgets for 11 states including Maryland, New Jersey, New York, Ohio and Pennsylvania. On October 26, 2016, the EPA finalized the CSAPR Update Rule, which reduces future NOx allocations and discounts the current banked allowances to account for the more stringent 2008 Ozone NAAQS and to address the D.C. Circuit's July 2015 decision. This rule has been challenged in the D.C. Circuit. The Registrants believe their investment in pollution controls and cleaner technologies leave the fleet well-positioned for compliance.

In February 2012, the EPA promulgated standards (the MATS rule) to control emissions of HAPs from coal and oil-fired electric generating units. The rule established limits for mercury, non-mercury metals, certain organics and acid gases, which had to be met beginning in April 2015 (with some units getting a 1-year extension). In June 2015, the U.S. Supreme Court issued a decision in the case of Michigan v. EPA, and held that the EPA unreasonably refused to consider costs when it determined that it was "appropriate and necessary" to regulate HAPs emitted by electric generating units. The U.S. Supreme Court did not vacate the MATS rule but rather remanded it to the D.C. Circuit for further proceedings. In December 2015, the D.C. Circuit remanded the MATS rule to the EPA without vacatur. On April 25, 2016, the EPA released a supplemental finding that the benefits of this regulation outweigh the costs to address the U.S. Supreme Court's ruling that the EPA had not properly considered costs. This finding has been challenged in the D.C. Circuit. On April 18, 2017, the EPA asked the D.C. Circuit to postpone oral argument that had been scheduled for May 18, 2017 because the EPA is closely reviewing the supplemental finding to determine whether it should reconsider all or part of the rule. On April 27, 2017, the D.C. Circuit granted EPA’s request to postpone the oral argument and hold the case in abeyance. While the Registrants cannot predict the final outcome of this rulemaking, the Registrants believe that because they have already invested in pollution controls and cleaner technologies, their fleet is well-positioned to comply with the MATS rule.

Water

In August 2014,the EPA finalized the regulation regarding the use of water for once through cooling at existing facilities to address impingement and entrainment concerns. The Registrants anticipate that more stringent requirements will be incorporated into some of their water discharge permits over the next several years as NPDES permits are renewed.

Effluent Limitations Guidelines — In November 2015, the EPA revised the Effluent Limitations Guidelines for Steam Electric Generating Facilities, which would have imposed more stringent requirements (as individual permits were renewed) for wastewater streams from flue gas desulfurization, or FGD, fly ash, bottom ash, and flue gas mercury control.  In April 2017, the EPA granted two petitions to reconsider the rule and also administratively stayed some of the deadlines. On September 18, 2017, the EPA promulgated a final rule that (i) postpones the compliance dates to preserve the status quo for FGD wastewater and bottom ash transport water by two years to November 2020 until the EPA completes its next rulemaking and (ii) withdrew the April 2017 administrative stay.  The legal challenges have been suspended while the EPA reconsiders and likely modifies the rule. Accordingly, the Registrants have largely eliminated their estimate of the environmental capital expenditures that would have been required to comply with permits incorporating the revised guidelines. The Registrants will revisit these estimates after the rule is revised.  

Byproducts, Wastes, Hazardous Materials and Contamination

In April 2015, the EPA finalized the rule regulating byproducts of coal combustion (e.g., ash and gypsum) as solid wastes under the RCRA. On September 13, 2017, the EPA granted a petition for reconsideration that the Utility Solid Waste Activities Group filed in May 2017. The Registrants have evaluated the impact of the new rule on their results of operations, financial condition and cash flows and have accrued their environmental and asset retirement obligations under the rule based on current estimates as of September 30, 2017.

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Debtors' Financial Information (GenOn and GenOn Americas Generation)

9 Months Ended

Sep. 30, 2017

Reorganizations [Abstract]

Debtors' Financial Information (GenOn and GenOn Americas Generation)

Chapter 11 Cases(GenOn and GenOn Americas Generation)

Chapter 11 Cases

On June 14, 2017, or the Petition Date, the GenOn Entities filed the Chapter 11 Cases. GenOn Mid-Atlantic, as well as its consolidated subsidiaries, REMA, and certain other subsidiaries, did not file for relief under Chapter 11.

The GenOn Entities remain in possession of their property and continue their business operations in the ordinary course uninterrupted as "debtors-in-possession" under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court.

On June 29, 2017, the GenOn Entities filed the Plan and the Disclosure Statement with the Bankruptcy Court consistent with the Restructuring Support Agreement. On September 18, 2017 and October 2, 2017, the GenOn Entities filed the Amended Plan and Amended Disclosure Statement and Second Amended Plan and Second Amended Disclosure Statement, respectively, which primarily provided the GenOn Entities with the flexibility to complete sales of certain assets pursuant to the Amended Plan and removed the GenOn Entities' requirement to conduct a rights offering in connection with the GenOn Entities' exit financing.

On October 31, 2017, the GenOn Entities announced that they entered into a Consent Agreement with certain holders of GenOn’s Senior Notes and GenOn Americas Generation's Senior Notes, collectively, the Consenting Holders, whereby the GenOn Entities and the Consenting Holders have agreed to extend the milestones in the Restructuring Support Agreement, by which the Plan must become effective, or the Effective Date. Specifically, the Consent Agreement extends the Effective Date milestone to June 30, 2018 or September 30, 2018, if regulatory approvals are still pending, or the Extended Effective Dates. The Consenting Holders’ consent to the Extended Effective Dates is contingent upon entry of an order as described in the Consent Agreement.

In addition, the GenOn Entities announced that, over the course of the past several weeks, both the principals and advisors of NRG and GenOn have been engaged in lengthy in-person negotiations in an effort to settle certain items that remained open and unresolved after the pre-petition Restructuring Support Agreement negotiations. These arms-length discussions included key topics such as: (i) timeline and transition, (ii) cooperation and co-development matters, (iii) post-employment and retiree health and welfare benefits and pension benefits, (iv) tax matters, and (v) intercompany balances. The agreements reached on these topics will be incorporated into definitive documents for GenOn’s emergence from Chapter 11.

On October 30, 2017, the GenOn Entities filed the Plan Supplement Documents, consisting of, among other things, new organizational documents, new exit financing documents, a pension indemnity agreement, an employee matters agreement, schedules of assumed and rejected executory contracts and unexpired leases, and the Backstop Commitment Letter.  The Plan Supplement Documents are subject to ongoing review, revision, and further negotiation by the parties to the Restructuring Support Agreement including the GenOn Debtors, Consenting Holders and NRG, who have various consent rights over the final form of the Plan Supplement Documents, and may be amended, modified, supplemented, and revised in accordance with those ongoing negotiations.

Restructuring Support Agreement

Prior to filing the Chapter 11 Cases, the GenOn Entities entered into the Restructuring Support Agreement on June 12, 2017 that provides for a restructuring and recapitalization of the GenOn Entities through a prearranged plan of reorganization. Completion of the agreed upon terms is contingent upon certain milestones in the Restructuring Support Agreement. Certain principal terms of the Restructuring Support Agreement are detailed below:

1) Full releases from GenOn and GenOn Americas Generation in favor of NRG, including either a full release or indemnification in favor of NRG for any claims relating to GenOn Mid-Atlantic or REMA and the dismissal of all litigation against NRG.

2) GenOn will receive cash consideration from NRG of $261.3 million pursuant to a settlement executed in connection with the Plan, which will be received in cash less any amounts owed to NRG under the intercompany secured revolving credit facility, or the Intercompany Revolver. As of September 30, 2017, GenOn owed NRG approximately $125 million under the Intercompany Revolver. See Note 10, Related Party Transactions, for further discussion of the Intercompany Revolver.

3) NRG will consent to the cancellation of its interests in the equity of GenOn. The equity interests in the reorganized GenOn will be issued to the holders of the GenOn Senior Notes along with a cash payment from NRG equal to approximately $75 million, which is included in the $261.3 million mentioned above, and, subject to certain eligibility restrictions, rights to participate pro rata in a new secured notes offering, as further described below.

4) NRG will retain the pension liability, including payment of approximately $13 million of 2017 pension contributions, for GenOn employees for service provided prior to the completion of the reorganization, which was paid in September 2017 and was reflected as a capital contribution to GenOn. GenOn’s pension liability as of September 30, 2017 was approximately $106 million.

5) The shared services agreement between GenOn and NRG will be amended such that (i) GenOn will receive shared services from NRG at an annualized rate of $84 million during the pendency of the Chapter 11 Cases, (ii) if the settlement is approved by the bankruptcy court, GenOn will receive shared services from NRG at no charge for two months, and (iii) NRG will then provide an option for up to two, one-month extensions for shared services at an annualized rate of $84 million. See Note 10, Related Party Transactions, for further discussion of the shared services agreement.

6) GenOn will receive a credit of approximately $28 million from NRG to apply against amounts owed under the shared services agreement upon emergence from bankruptcy. Any unused amount can be paid in cash at GenOn's request. The credit is specifically equal to the amount of the 4% aggregate principal amount of the new senior secured first lien notes due 2022, or the 2022 Notes, plus accrued interest from the date of entry into the escrow agreement entered into in connection with the 2022 Notes and is intended to reimburse GenOn for its payment of such amount, as described below.

7) NRG agreed to provide GenOn with a letter of credit facility during the pendency of the Chapter 11 Cases, which could be utilized for required letters of credit in lieu of the Intercompany Revolver. GenOn can no longer utilize the Intercompany Revolver and, on July 27, 2017, the letter of credit facility was terminated, as GenOn had obtained a separate letter of credit facility with a third party financial institution. See Note 10, Related Party Transactions, for further discussion of the Intercompany Revolver and the letter of credit facility and Note 8, Debt and Capital Leases, for the letter of credit facility obtained in July 2017.

8) Certain holders of the Senior Notes, known as the Backstop Parties, have executed a letter of commitment, or the Backstop Commitment Letter, pursuant to which the Backstop Parties committed to backstop the exit financing obtained by GenOn to facilitate the payment of the obligations under the Plan and other working capital needs of the GenOn Entities upon their emergence from Chapter 11.

9) GenOn and NRG have agreed to cooperate in good faith to maximize the value of certain development projects.

In addition to the Restructuring Support Agreement, additional support and other agreements are being negotiated, including a transition services agreement.

The filing of the Chapter 11 Cases automatically stayed most actions against the GenOn Entities pursuant to Section 362(a) of the Bankruptcy Code. Absent an order from the Bankruptcy Court, the GenOn Entities' pre-petition liabilities are subject to settlement under the Plan.

The GenOn Entities have filed certain motions with the Bankruptcy Court that have been approved. The GenOn Entities expect to operate in the normal course of business throughout the reorganization process. The GenOn Entities have continued to make payments to certain vendors with respect to pre-petition liabilities as permitted by the Bankruptcy Court order, and vendors have been paid for goods and services provided after the Petition Date in the ordinary course of business.

GenOn Debt

As of September 30, 2017, the Intercompany Revolver, GenOn Senior Notes, and GenOn Americas Generation Senior Notes totaled approximately $2.6 billion. The filing of the Chapter 11 Cases constitutes an event of default under the following debt instruments, or collectively, the Debt Documents:

1) The Intercompany Revolver with NRG;

2) The indenture governing the GenOn 7.875% Senior Notes due 2017 (as amended or supplemented from time to time);

3) The indenture governing the GenOn 9.500% Notes due 2018 (as amended or supplemented from time to time);

4) The indenture governing the GenOn 9.875% Notes due 2020 (as amended or supplemented from time to time);

5) The indenture governing the GenOn Americas Generation 8.50% Senior Notes due 2021 (as amended or supplemented from time to time); and

6) The indenture governing the GenOn Americas Generation 9.125% Senior Notes due 2031 (as amended or supplemented from time to time).

The Debt Documents set forth in 1-4 above provide that as a result of the commencement of the Chapter 11 Cases the principal and accrued interest due thereunder was immediately due and payable. The Debt Documents set forth in 5-6 above provide that as a result of the commencement of the Chapter 11 Cases the applicable indenture trustee or certain holders of the notes may declare the principal and accrued interest due thereunder to be immediately due and payable.  Any efforts to enforce such payment obligations under the Debt Documents were automatically stayed as a result of the commencement of the Chapter 11 Cases, and the holders’ rights of enforcement in respect of the Debt Documents are subject to the applicable provisions of the Bankruptcy Code. The Chapter 11 Cases could also potentially give rise to counterparty rights and remedies under other documents. For further discussion, see Note 8, Debt and Capital Leases and Note 11, Commitments and Contingencies.

2022 Notes

On May 8, 2017, a remote special purpose limited liability company issued $550 million in principal amount of notes that bore interest at a rate of 10.5% with a maturity date of June 1, 2022. The proceeds were deposited into a separate and independently maintained escrow account along with 4% of the principal amount and accrued interest from May 8, 2017 through June 15, 2017 totaling $28 million. If certain conditions were satisfied, GenOn was expected to merge with the remote special purpose limited liability company and assume the obligation for the 2022 Notes, which were to be secured by certain of GenOn’s and its subsidiaries' assets. Based on the terms of the underlying transaction documents governing the 2022 Notes, on June 14, 2017, when GenOn filed the Chapter 11 Cases, the funds held in the escrow account were released to the holders of the 2022 Notes, which were simultaneously redeemed. In connection with the escrow release, GenOn expensed $18 million in fees incurred in connection with the 2022 Notes offering in other expense. These fees, along with the $28 million that will be reimbursed by NRG, as further described in Note 10, Related Party Transactions, for total of $46 million, are reflected as financing costs in the statement of cash flows.

Backstop Fee

The Restructuring Support Agreement also contemplates $900 million in aggregate principal amount of exit financing sought by GenOn primarily to refinance existing indebtedness and pay distributions under the Plan. Consistent with the terms of the Backstop Commitment Letter, GenOn paid $45 million in total (5% of the principal amount of the exit financing), or the Backstop Fee, to certain holders of notes issued by GenOn and GenOn Americas Generation, or the Backstop Parties, in exchange for the Backstop Parties’ joint commitment to fully subscribe the exit financing in the event that certain other parties do not fund the full commitments of the exit financing. On October 2, 2017, the GenOn Entities amended the backstop commitment letter to, among other things, remove the requirement to conduct a rights offering.

The Backstop Fee was considered earned by the Backstop Parties and was paid on June 13, 2017. This payment is effectively a discount (a reduction of the proceeds to be received by GenOn from the noteholders) and is reported in other non-current assets on GenOn’s consolidated balance sheet as of September 30, 2017. When the financing is in effect, it will be reported as a direct reduction from the carrying amount of the debt and amortized over the five-year term as interest expense. The Backstop Fee is reflected as financing costs in the statement of cash flows.

Accounting for Reorganization

As a result of the Chapter 11 Cases, realization of assets and satisfaction of liabilities are subject to a significant number of uncertainties. The consolidated financial statements for GenOn and GenOn Americas Generation were prepared in accordance with Accounting Standards Codification (ASC) 852, Reorganizations, for debtors-in-possession.

Based on the events leading up to the Chapter 11 Cases, including the most recent PJM auction results, the Registrants considered whether it was necessary to impair any of their long-lived assets and concluded that no impairment had occurred as of September 30, 2017. 

Liabilities Subject to Compromise

GenOn's and GenOn Americas Generation's condensed consolidated balance sheets as of September 30, 2017 include amounts classified as liabilities subject to compromise which include prepetition liabilities that were allowed or that are estimated would be allowed as claims in its Chapter 11 proceedings. If there is uncertainty about whether a claim will be impaired under the Plan, the entire amount of the claim is included in liabilities subject to compromise. The following table summarizes the components of liabilities subject to compromise included on the condensed consolidated balance sheets of GenOn and GenOn Americas Generation:

	As of September 30, 2017
	GenOn		GenOn Americas Generation
	(In millions)
Accounts payable and accrued expenses	$	46	$	9
Long-term debt, including current portion	2,616		695
Accrued interest	56		10
Pension and post-retirement liabilities	131		—
Other	13		7
	$	2,862	$	721

Interest Expense

GenOn and GenOn Americas Generation will not pay interest expense during bankruptcy and it is not expected to be an allowable claim. Therefore, GenOn and GenOn Americas Generation did not record interest on the GenOn Senior Notes or the GenOn Americas Generation Senior Notes in the amount of $49 million and $18 million, respectively, for the period from June 14, 2017 through September 30, 2017.

Reorganization Items

Reorganization items represent costs and income directly associated with the Chapter 11 proceedings. The below table represents the significant items in reorganization items for GenOn and GenOn Americas Generation:

	Three months ended September 30, 2017					Nine months ended September 30, 2017
	GenOn			GenOn Americas Generation		GenOn			GenOn Americas Generation
	(In millions)					(In millions)
Legal and other professional advisory fees	$	(29	)	$	—	$	(55	)	$	(1	)
Write-off of debt premiums and credit reserves	—			—		103			43
	$	(29	)	$	—	$	48		$	42

During the nine months ended September 30, 2017, $32 million of cash payments were made by GenOn for reorganization items.

Debtors' Financial Information (GenOn and GenOn Americas Generation)

The financial information below represents the Debtor Entities condensed combined financial statements for the three months ended September 30, 2017 and the period from June 14, 2017 through September 30, 2017. The following represent the entities included in the GenOn Entities, or the GenOn Energy, Inc. Debtors:

GenOn Americas Generation, LLC1	NRG Lovett LLC1
GenOn Americas Procurement, Inc.	NRG New York LLC1
GenOn Asset Management, LLC	NRG North America LLC1
GenOn Capital Inc.	NRG Northeast Generation, Inc.
GenOn Energy Holdings, Inc.	NRG Northeast Holdings, Inc.
GenOn Energy Management, LLC1	NRG Potrero LLC1
GenOn Energy Services, LLC	NRG Power Generation Assets LLC
GenOn Energy, Inc.	NRG Power Generation LLC
GenOn Fund 2001 LLC	NRG Power Midwest GP LLC
GenOn Mid-Atlantic Development, LLC	NRG Power Midwest LP
GenOn Power Operating Services MidWest, Inc.	NRG Sabine (Delaware), Inc.
GenOn Special Procurement, Inc.1	NRG Sabine (Texas), Inc.
Hudson Valley Gas Corporation1	NRG San Gabriel Power Generation LLC
Mirant Asia-Pacific Ventures, LLC	NRG Tank Farm LLC
Mirant Intellectual Asset Management and Marketing, LLC	NRG Wholesale Generation GP LLC
Mirant International Investments, Inc.	NRG Wholesale Generation LP
Mirant New York Services, LLC	NRG Willow Pass LLC
Mirant Power Purchase, LLC	Orion Power New York GP, Inc.
Mirant Wrightsville Investments, Inc.	Orion Power New York LP, LLC
Mirant Wrightsville Management, Inc.	Orion Power New York, L.P.
MNA Finance Corp.1	RRI Energy Broadband, Inc.
NRG Americas, Inc.	RRI Energy Channelview (Delaware) LLC
NRG Bowline LLC1	RRI Energy Channelview (Texas) LLC
NRG California North LLC1	RRI Energy Channelview LP
NRG California South GP LLC	RRI Energy Communications, Inc.
NRG California South LP	RRI Energy Services Channelview LLC
NRG Canal LLC1	RRI Energy Services Desert Basin, LLC
NRG Delta LLC1	RRI Energy Services, LLC
NRG Florida GP, LLC	RRI Energy Solutions East, LLC
NRG Florida LP	RRI Energy Trading Exchange, Inc.
NRG Lovett Development I LLC1	RRI Energy Ventures, Inc.

¹ Represent the GenOn Americas Generation debtor entities, or the GenOn Americas Generation Debtors.

Supplemental Condensed Combined Statement of Operations
(Unaudited)
	Three months ended September 30, 2017						Period from June 14, 2017 through September 30, 2017
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors			GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)						(In millions)
Total operating revenues	$	500		$	446		$	594		$	511
Total operating costs and expenses	396			408			462			471
Operating Income	104			38			132			40
Other Expense
Total other expense	(3		)	(5		)	(4		)	(6		)
Income Before Reorganization Items and Income Taxes	101			33			128			34
Reorganization items, net	(29		)	—			74			43
Income Before Income Taxes	72			33			202			77
Income tax expense	—			—			—			—
Net Income	$	72		$	33		$	202		$	77

The condensed combined comprehensive income for GenOn Energy, Inc. Debtors and the GenOn Americas Generation Debtors is equal to the condensed combined net income for the three months ended September 30, 2017 and the period from June 14, 2017 through September 30, 2017.

Supplemental Condensed Combined Balance Sheet
As of September 30, 2017
(Unaudited)
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)
ASSETS
Cash and cash equivalents	$	568		$	—
Restricted cash	1			—
Accounts receivable	117			110
Accounts receivable — affiliate	658			—
Notes receivable — affiliate	—			318
Prepaid rent and other current assets	898			274
Total current assets	2,242			702
Property, plant and equipment, net	1,235			155
Investment in subsidiaries	(269		)	1,117
Notes receivable — affiliate	544			—
Other non-current assets	144			68
Total Assets	$	3,896		$	2,042
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	$	42		$	20
Accounts payable — affiliate	—			26
Accrued expenses and other current liabilities	134			93
Total current liabilities	176			139
Liabilities subject to compromise	2,862			721
Long-term debt — affiliate	125			—
Other non-current liabilities	338			81
Total Liabilities	3,501			941
Stockholder's equity	395			1,101
Total Liabilities and Stockholder's Equity	$	3,896		$	2,042

Supplemental Condensed Combined Statement of Cash Flows
Period from June 14, 2017 through September 30, 2017
(Unaudited)
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)
Net cash provided by operating activities	$	97		$	4
Net cash used by investing activities	(9		)	(4		)
Net cash used by financing activities	(3		)	—
Net increase in cash, cash equivalents and restricted cash	85			—
Cash, cash equivalents and restricted cash at beginning of period	484			—
Cash, cash equivalents and restricted cash at end of period	$	569		$	—

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Summary of Significant Accounting Policies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Chapter 11 Cases

Chapter 11 Cases

As further described in Note 3, Chapter 11 Cases, on June 14, 2017, GenOn, along with GenOn Americas Generation and certain of their directly and indirectly-owned subsidiaries, or collectively the GenOn Entities, filed voluntary petitions for relief under Chapter 11, or the Chapter 11 Cases, of the United States Bankruptcy Code, or the Bankruptcy Code, in the United States Bankruptcy Court for the Southern District of Texas, Houston Division, or the Bankruptcy Court. GenOn Mid-Atlantic, as well as its consolidated subsidiaries, REMA and certain other subsidiaries, did not file for relief under Chapter 11.

The GenOn Entities remain in possession of their property and continue their business operations in the ordinary course uninterrupted as "debtors-in-possession" under jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court. The consolidated financial statements for GenOn and GenOn Americas Generation were prepared in accordance with Accounting Standards Codification (ASC) 852, Reorganizations, for debtors-in-possession.

Liquidity and Ability to Continue as a Going Concern

Liquidity and Ability to Continue as a Going Concern

As described above and in Note 3, Chapter 11 Cases, the GenOn Entities have submitted the Plan in connection with the Chapter 11 Cases. There is no assurance that such Plan will be approved by the requisite stakeholders, confirmed by the Bankruptcy Court, or successfully implemented thereafter. GenOn's and GenOn Americas Generation’s ability to continue as a going concern is dependent on many factors, including the successful confirmation of the Plan and emergence from bankruptcy. Given the uncertainty as to the outcome of these factors, there is substantial doubt about GenOn's and GenOn Americas Generation's ability to continue as a going concern.

The accompanying unaudited interim condensed consolidated financial statements have been prepared assuming GenOn will continue as a going concern, which contemplates continuity of operations, realization of assets and the satisfaction of liabilities in the normal course of business. As such, the accompanying unaudited interim condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of assets and their carrying amounts, or the amount and classification of liabilities that may result should GenOn be unable to continue as a going concern. Such adjustments could have a material adverse impact on GenOn's results of operations, cash flows and financial position.

With respect to GenOn Mid-Atlantic, a consolidated subsidiary of GenOn, management has determined that while it has sufficient cash on hand to fund current obligations including operating lease payments due under the GenOn Mid-Atlantic operating leases as of September 30, 2017, the potential significant adverse impact of financial stresses at GenOn Mid-Atlantic's parent companies and any adverse impact resulting from the notification by GenOn Mid-Atlantic's owner lessors alleging the existence of certain lease events of default as further described in Note 8, Debt and Capital Leases, has caused there to be substantial doubt about GenOn Mid-Atlantic's ability to continue as a going concern.

Basis of Presentation

Basis of Presentation

This is a combined quarterly report of the Registrants for the quarter ended September 30, 2017. The notes to the condensed consolidated financial statements apply to the Registrants as indicated parenthetically next to each corresponding disclosure. The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with the SEC's regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the financial statements in the Registrants' 2016 Form 10-K. Interim results are not necessarily indicative of results for a full year.

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

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

Reclassifications

Reclassifications

Certain prior year amounts have been reclassified for comparative purposes.  The reclassifications did not affect results from operations, net assets or cash flows. 

Recent Accounting Developments - Guidance Adopted in 2017 and Guidance Not Yet Adopted (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

Recent Accounting Developments — Guidance Adopted in 2017 (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

ASU 2016-18 — In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash, or ASU No. 2016-18. The amendments of ASU No. 2016-18 require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts on the statement of cash flows. For GenOn and GenOn Americas Generation, this includes amounts classified as funds deposited by counterparties. The amendments of ASU No. 2016-18 are effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods.  Early adoption is permitted and the adoption of ASU No. 2016-18 will be applied retrospectively. GenOn and GenOn Americas Generation adopted the guidance in ASU No. 2016-18 during the second quarter of 2017. In connection with the adoption of the standard, the Registrants have applied the guidance retrospectively which resulted in a decrease of the cash flows provided by operating activities of $41 million for the nine months ended September 30, 2016 for GenOn and GenOn Americas Generation. The adoption of ASU No. 2016-18 did not have an impact to GenOn Mid-Atlantic's statement of cash flows.

Recent Accounting Developments — Guidance Not Yet Adopted (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic)

ASU 2017-12 — In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities, or ASU No. 2017-12. The amendments of ASU No. 2017-12 were issued to simplify the application of hedge accounting guidance and more closely align financial reporting for hedging relationships with economic results of an entity's risk management activities. The issues addressed by ASU No. 2017-12 include but are not limited to alignment of risk management activities and financial reporting, risk component hedging, accounting for the hedged item in fair value hedges of interest rate risk, recognition and presentation of the effects of hedging instruments, amounts excluded from the assessment of hedge effectiveness, and other simplifications of hedge accounting guidance. The amendments of ASU No. 2017-12 are effective for fiscal years beginning after December 15, 2018, and interim periods therein.  Early adoption is permitted in any interim period and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The Registrants do not expect the adoption of ASU No. 2017-12 will have a material impact on their consolidated results of operations, cash flows, and statement of financial position.

ASU 2017-07 — In March 2017, the FASB issued ASU No. 2017-07, Compensation — Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, or ASU No. 2017-07.   Current GAAP does not indicate where the amount of net benefit cost should be presented in an entity’s income statement and does not require entities to disclose the amount of net benefit cost that is included in the income statement.  The amendments of ASU No. 2017-07 require an entity to report the service cost component of net benefit costs in the same line item as other compensation costs arising from services rendered by the related employees during the applicable service period.  The other components of net benefit cost are required to be presented separately from the service cost component and outside the subtotal of income from operations. Further, ASU No. 2017-07 prescribes that only the service cost component of net benefit costs is eligible for capitalization. The amendments of ASU No. 2017-07 are effective for fiscal years beginning after December 15, 2017, including interim periods therein.  Early adoption is permitted and must be applied on a retrospective basis, except for the amendments regarding the capitalization of the service cost component, which must be applied prospectively. GenOn is currently assessing the impact that the adoption of ASU No. 2017-07 will have on its results of operations, cash flows, and statement of financial position.

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

ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or Topic 606, which was further amended through various updates issued by the FASB thereafter. The amendments of Topic 606 completed the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. The guidance under Topic 606 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes a five step model to be applied by an entity in evaluating its contracts with customers. The Registrants expect to adopt the standard effective January 1, 2018 and apply the guidance retrospectively to contracts at the date of adoption. The Registrants will recognize the cumulative effect of applying Topic 606 at the date of initial application, as prescribed under the modified retrospective transition method. The Registrants also expect to elect the practical expedient available under Topic 606 for measuring progress toward complete satisfaction of a performance obligation and for disclosure requirements of remaining performance obligations. The practical expedient allows an entity to recognize revenue in the amount to which the entity has the right to invoice such that the entity has a right to the consideration in an amount that corresponds directly with the value to the customer for performance completed to date by the entity. In 2016, the Registrants continued to assess the new standard with a focus on identifying the performance obligations included within its revenue arrangements with customers and evaluating the Registrants' methods of estimating the amount and timing of variable consideration. While the impact remains subject to continued review, the Registrants do not believe the adoption of Topic 606 will have a material impact on their financial statements.

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Summary of Significant Accounting Policies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Schedule of accumulated depreciation and accumulated amortization

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

	Property, plant and equipment Accumulated depreciation				Intangible assets Accumulated amortization
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
GenOn	$	730	$	604	$	66	$	87
GenOn Americas Generation	329		275		66		87
GenOn Mid-Atlantic	284		237		33		29

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Chapter 11 Cases (GenOn and GenOn Americas Generation) (Tables)

9 Months Ended

Sep. 30, 2017

Reorganizations [Abstract]

Schedule of components of liabilities subject to compromise

The following table summarizes the components of liabilities subject to compromise included on the condensed consolidated balance sheets of GenOn and GenOn Americas Generation:

	As of September 30, 2017
	GenOn		GenOn Americas Generation
	(In millions)
Accounts payable and accrued expenses	$	46	$	9
Long-term debt, including current portion	2,616		695
Accrued interest	56		10
Pension and post-retirement liabilities	131		—
Other	13		7
	$	2,862	$	721

Schedule of reorganization items

The below table represents the significant items in reorganization items for GenOn and GenOn Americas Generation:

	Three months ended September 30, 2017					Nine months ended September 30, 2017
	GenOn			GenOn Americas Generation		GenOn			GenOn Americas Generation
	(In millions)					(In millions)
Legal and other professional advisory fees	$	(29	)	$	—	$	(55	)	$	(1	)
Write-off of debt premiums and credit reserves	—			—		103			43
	$	(29	)	$	—	$	48		$	42

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Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value of Financial Instruments

Assets and liabilities measured and recorded at fair value on the consolidated balance sheets on a recurring basis

GenOn

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn’s consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	56	$	—	$	56
Derivative liabilities:
Commodity contracts	$	—	$	36	$	5	$	41
Other assets (b)	$	8	$	—	$	—	$	8

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

(b) Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	122	$	2	$	124
Derivative liabilities:
Commodity contracts	$	—	$	119	$	3	$	122
Other assets (b)	$	10	$	—	$	—	$	10

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

(b) Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees.

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, 2017 and 2016, the beginning and ending balances for derivatives that are recognized at fair value in GenOn's consolidated financial statements at least annually using significant unobservable inputs:

	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	(2	)	$	(11	)	$	(1	)	$	(12	)
Total (losses)/gains included in earnings — realized/unrealized	(1		)	7			(2		)	6
Purchases	(2		)	(1		)	(2		)	1
Transfers out of Level 3 (b)	—			1			—			1
Ending balance	$	(5	)	$	(4	)	$	(5	)	$	(4	)
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	5		$	(3	)	$	(3	)

(a) Consists of derivative assets and liabilities, net.

(b) Transfers out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

Schedule of significant unobservable inputs used in developing the fair value of the Registrants' Level 3 positions

The following tables quantify the significant unobservable inputs used in developing the fair value of the Registrants' Level 3 positions as of September 30, 2017 and December 31, 2016:

GenOn

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
FTRs	$	—	$	5	Discounted Cash Flow	Auction Prices (per MWh)	$	(3	)	$	1	$	—
	$	—	$	5

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29		$	59	$	43
Coal Contracts	—		1		Discounted Cash Flow	Forward Market Price (per ton)	42			51		45
FTRs	1		2		Discounted Cash Flow	Auction Prices (per MWh)	(2		)	3		—
	$	2	$	3

Schedule of sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs

The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of September 30, 2017 and December 31, 2016:

Significant Unobservable Input	Position	Change In Input	Impact on Fair Value Measurement
Forward Market Price Power/Coal	Buy	Increase/(Decrease)	Higher/(Lower)
Forward Market Price Power/Coal	Sell	Increase/(Decrease)	Lower/(Higher)
FTR Prices	Buy	Increase/(Decrease)	Higher/(Lower)
FTR Prices	Sell	Increase/(Decrease)	Lower/(Higher)

Schedule of credit reserves for derivative contract assets

The Registrants' credit reserves were as follows:

	As of September 30, 2017		As of December 31, 2016
	(In millions)
GenOn	$	—	$	1
GenOn Americas Generation	—		1

Net counterparty credit exposure by industry sector and by counterparty credit quality

The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for the Registrants with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market, NPNS and non-derivative transactions. The exposure is shown net of collateral held and includes amounts net of receivables or payables.

	Net Exposure (a) (b) (% of Total)
Category by Industry Sector	GenOn		GenOn Americas Generation		GenOn Mid-Atlantic
Utilities, energy merchants, marketers and other	100	%	100	%	—	%
Total as of September 30, 2017	100	%	100	%	—	%

	Net Exposure (a) (b) (% of Total)
Category by Counterparty Credit Quality	GenOn		GenOn Americas Generation		GenOn Mid-Atlantic
Investment grade	96	%	96	%	—	%
Non-Investment grade/Non-rated	4		4		—
Total as of September 30, 2017	100	%	100	%	—	%

(a) Counterparty credit exposure excludes transportation contracts because of the unavailability of market prices.

(b) The figures in the tables above exclude potential counterparty credit exposure related to RTOs, ISOs, registered commodity exchanges and certain long term contracts.

GenOn Americas Generation

Fair Value of Financial Instruments

Assets and liabilities measured and recorded at fair value on the consolidated balance sheets on a recurring basis

GenOn Americas Generation

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn Americas Generation's consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	89	$	5	$	94
Derivative liabilities:
Commodity contracts	$	—	$	88	$	6	$	94

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	209	$	5	$	214
Derivative liabilities:
Commodity contracts	$	—	$	212	$	5	$	217

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

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, 2017 and 2016, the beginning and ending balances for GenOn Americas Generation's derivatives 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)
	Three months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	1		$	—		$	1
Total losses included in earnings — realized/unrealized	(1		)	—			(1		)	(1		)
Purchases	—			(1		)	—			—
Transfers out of Level 3 (b)	—			1			—			1
Ending balance	$	(1	)	$	1		$	(1	)	$	1
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	—		$	(1	)	$	—

(a) Consists of derivative assets and liabilities, net.

(b) Transfers out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

Schedule of significant unobservable inputs used in developing the fair value of the Registrants' Level 3 positions

GenOn Americas Generation

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
FTRs	$	5	$	6	Discounted Cash Flow	Auction Prices (per MWh)	$	(3	)	$	1	$	—
	$	5	$	6

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low			High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29		$	59	$	43
Coal Contracts	1		1		Discounted Cash Flow	Forward Market Price (per ton)	42			51		45
FTRs	3		4		Discounted Cash Flow	Auction Prices (per MWh)	(2		)	3		—
	$	5	$	5

GenOn Mid-Atlantic

Fair Value of Financial Instruments

Assets and liabilities measured and recorded at fair value on the consolidated balance sheets on a recurring basis

GenOn Mid-Atlantic

The following tables present assets and liabilities (including affiliate amounts) measured and recorded at fair value on GenOn Mid-Atlantic's consolidated balance sheet on a recurring basis and their level within the fair value hierarchy:

	As of September 30, 2017
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	12	$	—	$	12
Derivative liabilities:
Commodity contracts	$	—	$	13	$	1	$	14

(a) There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

	As of December 31, 2016
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	—	$	47	$	1	$	48
Derivative liabilities:
Commodity contracts	$	—	$	45	$	1	$	46

(a) There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

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, 2017 and 2016, the beginning and ending balances for GenOn Mid-Atlantic's derivatives 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)
	Three months ended September 30,					Nine months ended September 30,
	2017			2016		2017			2016
	Derivatives (a)					Derivatives (a)
	(In millions)
Beginning balance	$	—		$	1	$	—		$	2
Total losses included in earnings — realized/unrealized	(1		)	—		(1		)	(1		)
Ending balance	$	(1	)	$	1	$	(1	)	$	1
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	$	(1	)	$	—	$	(1	)	$	—

(a) Consists of derivative assets and liabilities, net.

Schedule of significant unobservable inputs used in developing the fair value of the Registrants' Level 3 positions

GenOn Mid-Atlantic

	Significant Unobservable Inputs
	September 30, 2017
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low		High		Weighted Average
	(In millions)
FTRs	$	—	$	1	Discounted Cash Flow	Auction Prices (per MWh)	$	—	$	1	$	—
	$	—	$	1

	Significant Unobservable Inputs
	December 31, 2016
	Fair Value						Input/Range
	Assets		Liabilities		Valuation Technique	Significant Unobservable Input	Low		High		Weighted Average
	(In millions)
Power Contracts	$	1	$	—	Discounted Cash Flow	Forward Market Price (per MWh)	$	29	$	59	$	43
FTRs	—		1		Discounted Cash Flow	Auction Prices (per MWh)	—		1		—
	$	1	$	1

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Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Tables)

9 Months Ended

Sep. 30, 2017

Accounting for Derivative Instruments and Hedging Activities

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

The following table summarizes the net notional volume buy/(sell) of the Registrants’ open derivative transactions broken out by commodity, excluding those derivatives that qualified for the NPNS exception, as of September 30, 2017 and December 31, 2016. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.

		GenOn			GenOn Americas Generation			GenOn Mid-Atlantic
		Total Volume			Total Volume			Total Volume
		As of September 30, 2017		As of December 31, 2016	As of September 30, 2017		As of December 31, 2016	As of September 30, 2017		As of December 31, 2016
Commodity	Units	(In millions)
Coal	Short Ton	2		5	1		4	1		4
Natural Gas	MMBtu	72		138	13		30	13		23
Power	MWh	(12	)	(35)	(3	)	(12)	(3	)	(11)

Fair value within the derivative instrument valuation on the balance sheets

The following tables summarize the fair value within the derivative instrument valuation on the balance sheet:

GenOn

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	39	$	108	$	35	$	105
Commodity contracts long-term	17		16		6		17
Total Derivatives Not Designated as Cash Flow Hedges	$	56	$	124	$	41	$	122

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

The following tables summarize the offsetting of derivatives by counterparty master agreement level and collateral received or paid:

GenOn

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets	$	45		$	(15	)	$	—	$	30
Derivative assets - affiliate	11			(11		)	—		—
Derivative liabilities	(28		)	15			2		(11		)
Derivative liabilities - affiliate	(13		)	11			2		—
Total derivative instruments	$	15		$	—		$	4	$	19

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets	$	70		$	(39	)	$	—	$	31
Derivative assets - affiliate	54			(54		)	—		—
Derivative liabilities	(56		)	39			1		(16		)
Derivative liabilities - affiliate	(66		)	54			12		—
Total derivative instruments	$	2		$	—		$	13	$	15

Pre-tax effects of economic hedges that have not been designated as cash flow hedges and trading activity on the statements of operations

The following tables summarize the pre-tax effects of economic hedges. These amounts are included within operating revenues and cost of operations.

GenOn

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	9		$	(29	)	$	7	$	(145	)
Net unrealized (losses)/gains on open positions related to economic hedges	(28		)	(68		)	9		(43		)
Total unrealized (losses)/gains	$	(19	)	$	(97	)	$	16	$	(188	)

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Revenue from operations — energy commodities	$	(23	)	$	(142	)	$	7	$	(233	)
Cost of operations	4			45			9		45
Total impact to statements of operations	$	(19	)	$	(97	)	$	16	$	(188	)

GenOn Americas Generation

Accounting for Derivative Instruments and Hedging Activities

Fair value within the derivative instrument valuation on the balance sheets

GenOn Americas Generation

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	69	$	180	$	71	$	185
Commodity contracts long-term	25		34		23		32
Total Derivatives Not Designated as Cash Flow Hedges	$	94	$	214	$	94	$	217

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

GenOn Americas Generation

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets	$	45		$	(15	)	$	—	$	30
Derivative assets - affiliate	49			(49		)	—		—
Derivative liabilities	(28		)	15			2		(11		)
Derivative liabilities - affiliate	(66		)	49			2		(15		)
Total derivative instruments	$	—		$	—		$	4	$	4

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets	$	70		$	(39	)	$	—	$	31
Derivative assets - affiliate	144			(144		)	—		—
Derivative liabilities	(56		)	39			1		(16		)
Derivative liabilities - affiliate	(161		)	144			12		(5		)
Total derivative instruments	$	(3	)	$	—		$	13	$	10

Pre-tax effects of economic hedges that have not been designated as cash flow hedges and trading activity on the statements of operations

GenOn Americas Generation

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017		2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	11		$	(46	)	$	2	$	(165	)
Net unrealized (losses)/gains on open positions related to economic hedges	(13		)	6			6		(23		)
Total unrealized (losses)/gains	$	(2	)	$	(40	)	$	8	$	(188	)

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Revenue from operations — energy commodities	$	(6	)	$	(75	)	$	(1	)	$	(228	)
Cost of operations	4			35			9			40
Total impact to statements of operations	$	(2	)	$	(40	)	$	8		$	(188	)

GenOn Mid-Atlantic

Accounting for Derivative Instruments and Hedging Activities

Fair value within the derivative instrument valuation on the balance sheets

GenOn Mid-Atlantic

	Fair Value
	Derivative Assets				Derivative Liabilities
	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	10	$	44	$	14	$	44
Commodity contracts long-term	2		4		—		2
Total Derivatives Not Designated as Cash Flow Hedges	$	12	$	48	$	14	$	46

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

GenOn Mid-Atlantic

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
September 30, 2017	(In millions)
Commodity contracts:
Derivative assets - affiliate	$	12		$	(12	)	$	—	$	—
Derivative liabilities - affiliate	(14		)	12			—		(2		)
Total derivative instruments	$	(2	)	$	—		$	—	$	(2	)

	Gross Amounts Not Offset in the Statement of Financial Position
Description	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted		Net Amount
December 31, 2016	(In millions)
Commodity contracts:
Derivative assets - affiliate	$	48		$	(46	)	$	—	$	2
Derivative liabilities - affiliate	(46		)	46			—		—
Total derivative instruments	$	2		$	—		$	—	$	2

Pre-tax effects of economic hedges that have not been designated as cash flow hedges and trading activity on the statements of operations

GenOn Mid-Atlantic

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	7		$	(47	)	$	(3	)	$	(146	)
Net unrealized (losses)/gains on open positions related to economic hedges	(12		)	4			1			(18		)
Total unrealized losses	$	(5	)	$	(43	)	$	(2	)	$	(164	)

	Three months ended September 30,						Nine months ended September 30,
(In millions)	2017			2016			2017			2016
Revenue from operations — energy commodities	$	(10	)	$	(83	)	$	(2	)	$	(203	)
Cost of operations	5			40			—			39
Total impact to statements of operations	$	(5	)	$	(43	)	$	(2	)	$	(164	)

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Debt and Capital Leases (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic) (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Components of long-term debt and capital leases

Long-term debt and capital leases consisted of the following:

(In millions, except rates)	September 30, 2017			December 31, 2016		September 30, 2017 interest rate %
GenOn Americas Generation:
GenOn Americas Generation Senior Notes, due 2021	$	366		$	366	8.500
GenOn Americas Generation Senior Notes, due 2031	329			329		9.125
Premiums (a)	—			50
Less: Liabilities subject to compromise	(695		)	—
Subtotal GenOn Americas Generation	—			745
GenOn Energy:
GenOn Senior Notes, due 2017	691			691		7.875
GenOn Senior Notes, due 2018	649			649		9.500
GenOn Senior Notes, due 2020	490			490		9.875
Other liabilities (b)	91			96
GenOn capital lease	2			2
Premiums (a)	—			81
Less: Liabilities subject to compromise	(1,921		)	—
Subtotal GenOn Energy	2			2,009
Subtotal	2			2,754
Less: current maturities	1			704
Total long-term debt and capital leases	$	1		$	2,050

(a)    Premiums were written-off at Petition Date in accordance with ASC 852, Reorganizations.

(b)    Debt financing liabilities associated with the Long Term Service Agreements for the Choctaw and Hunterstown facilities.

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Income Taxes (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Tables)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income tax (benefit)/provision

GenOn’s income tax expense consisted of the following:

	Three months ended September 30,						Nine months ended September 30,
(In millions except otherwise noted)	2017			2016			2017			2016
Income before income taxes	$	72		$	284		$	49		$	268
Income tax expense	—			21			7			20
Effective tax rate	—		%	7.4		%	14.3		%	7.5		%

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Related Party Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Tables)

9 Months Ended

Sep. 30, 2017

GenOn Americas Generation

Related Party Transaction

Summary of material related-party transactions with affiliates

The following costs were incurred under these arrangements:

GenOn Americas Generation

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017			2016
	(In millions)
Allocated costs:
Cost of operations — affiliate	$	—	$	—	$	(1	)	$	2
General and administrative — affiliate	9		21		53			62
Total	$	9	$	21	$	52		$	64

GenOn Mid-Atlantic

Related Party Transaction

Summary of material related-party transactions with affiliates

GenOn Mid-Atlantic

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017		2016
	(In millions)
Allocated costs:
Cost of operations — affiliate	$	1	$	1	$	2	$	2
General and administrative — affiliate	4		15		42		45
Total	$	5	$	16	$	44	$	47

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Debtors' Financial Information (GenOn and GenOn Americas Generation) (Tables)

9 Months Ended

Sep. 30, 2017

Reorganizations [Abstract]

Schedule of debtor entities

The following represent the entities included in the GenOn Entities, or the GenOn Energy, Inc. Debtors:

GenOn Americas Generation, LLC1	NRG Lovett LLC1
GenOn Americas Procurement, Inc.	NRG New York LLC1
GenOn Asset Management, LLC	NRG North America LLC1
GenOn Capital Inc.	NRG Northeast Generation, Inc.
GenOn Energy Holdings, Inc.	NRG Northeast Holdings, Inc.
GenOn Energy Management, LLC1	NRG Potrero LLC1
GenOn Energy Services, LLC	NRG Power Generation Assets LLC
GenOn Energy, Inc.	NRG Power Generation LLC
GenOn Fund 2001 LLC	NRG Power Midwest GP LLC
GenOn Mid-Atlantic Development, LLC	NRG Power Midwest LP
GenOn Power Operating Services MidWest, Inc.	NRG Sabine (Delaware), Inc.
GenOn Special Procurement, Inc.1	NRG Sabine (Texas), Inc.
Hudson Valley Gas Corporation1	NRG San Gabriel Power Generation LLC
Mirant Asia-Pacific Ventures, LLC	NRG Tank Farm LLC
Mirant Intellectual Asset Management and Marketing, LLC	NRG Wholesale Generation GP LLC
Mirant International Investments, Inc.	NRG Wholesale Generation LP
Mirant New York Services, LLC	NRG Willow Pass LLC
Mirant Power Purchase, LLC	Orion Power New York GP, Inc.
Mirant Wrightsville Investments, Inc.	Orion Power New York LP, LLC
Mirant Wrightsville Management, Inc.	Orion Power New York, L.P.
MNA Finance Corp.1	RRI Energy Broadband, Inc.
NRG Americas, Inc.	RRI Energy Channelview (Delaware) LLC
NRG Bowline LLC1	RRI Energy Channelview (Texas) LLC
NRG California North LLC1	RRI Energy Channelview LP
NRG California South GP LLC	RRI Energy Communications, Inc.
NRG California South LP	RRI Energy Services Channelview LLC
NRG Canal LLC1	RRI Energy Services Desert Basin, LLC
NRG Delta LLC1	RRI Energy Services, LLC
NRG Florida GP, LLC	RRI Energy Solutions East, LLC
NRG Florida LP	RRI Energy Trading Exchange, Inc.
NRG Lovett Development I LLC1	RRI Energy Ventures, Inc.

¹ Represent the GenOn Americas Generation debtor entities, or the GenOn Americas Generation Debtors.

Debtor condensed combined statement of operations

Supplemental Condensed Combined Statement of Operations
(Unaudited)
	Three months ended September 30, 2017						Period from June 14, 2017 through September 30, 2017
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors			GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)						(In millions)
Total operating revenues	$	500		$	446		$	594		$	511
Total operating costs and expenses	396			408			462			471
Operating Income	104			38			132			40
Other Expense
Total other expense	(3		)	(5		)	(4		)	(6		)
Income Before Reorganization Items and Income Taxes	101			33			128			34
Reorganization items, net	(29		)	—			74			43
Income Before Income Taxes	72			33			202			77
Income tax expense	—			—			—			—
Net Income	$	72		$	33		$	202		$	77

Debtor condensed combined balance sheet

Supplemental Condensed Combined Balance Sheet
As of September 30, 2017
(Unaudited)
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)
ASSETS
Cash and cash equivalents	$	568		$	—
Restricted cash	1			—
Accounts receivable	117			110
Accounts receivable — affiliate	658			—
Notes receivable — affiliate	—			318
Prepaid rent and other current assets	898			274
Total current assets	2,242			702
Property, plant and equipment, net	1,235			155
Investment in subsidiaries	(269		)	1,117
Notes receivable — affiliate	544			—
Other non-current assets	144			68
Total Assets	$	3,896		$	2,042
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	$	42		$	20
Accounts payable — affiliate	—			26
Accrued expenses and other current liabilities	134			93
Total current liabilities	176			139
Liabilities subject to compromise	2,862			721
Long-term debt — affiliate	125			—
Other non-current liabilities	338			81
Total Liabilities	3,501			941
Stockholder's equity	395			1,101
Total Liabilities and Stockholder's Equity	$	3,896		$	2,042

Debtor condensed combined statement of cash flows

Supplemental Condensed Combined Statement of Cash Flows
Period from June 14, 2017 through September 30, 2017
(Unaudited)
	GenOn Energy, Inc. Debtors			GenOn Americas Generation Debtors
	(In millions)
Net cash provided by operating activities	$	97		$	4
Net cash used by investing activities	(9		)	(4		)
Net cash used by financing activities	(3		)	—
Net increase in cash, cash equivalents and restricted cash	85			—
Cash, cash equivalents and restricted cash at beginning of period	484			—
Cash, cash equivalents and restricted cash at end of period	$	569		$	—

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Basis of Presentation (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Details) - MW	1 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Basis of Presentation
Generation capacity (in MW)		15,395
Senior Notes
Basis of Presentation
Percentage aggregate principal amount of borrowings outstanding threshold (greater than) (as percent)	93.00%
Pittsburg
Basis of Presentation
Generation capacity (in MW)			1,029
GenOn Americas Generation, LLC
Basis of Presentation
Generation capacity (in MW)		6,878
GenOn Americas Generation, LLC | Senior Notes
Basis of Presentation
Percentage aggregate principal amount of borrowings outstanding threshold (greater than) (as percent)	93.00%
GenOn Mid-Atlantic, LLC
Basis of Presentation
Generation capacity (in MW)		4,605

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Summary of Significant Accounting Policies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Property, plant and equipment Accumulated depreciation	$ 730	$ 604
Intangible assets Accumulated amortization	66	87
GenOn Americas Generation
Condensed Balance Sheet Statements, Captions [Line Items]
Property, plant and equipment Accumulated depreciation	329	275
Intangible assets Accumulated amortization	66	87
GenOn Mid-Atlantic
Condensed Balance Sheet Statements, Captions [Line Items]
Property, plant and equipment Accumulated depreciation	284	237
Intangible assets Accumulated amortization	$ 33	$ 29

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Summary of Significant Accounting Policies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Narrative (Details) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in cash flows provided by operating activities	$ 53	$ (190)
GenOn Americas Generation, LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in cash flows provided by operating activities	$ (10)	(153)
ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in cash flows provided by operating activities		41
ASU 2016-18 | GenOn Americas Generation, LLC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in cash flows provided by operating activities		$ 41

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Chapter 11 Cases (GenOn and GenOn Americas Generation) - Narrative (Details)		1 Months Ended	4 Months Ended	9 Months Ended
	Jun. 13, 2017 USD ($)	Jun. 15, 2017 USD ($)	Sep. 30, 2017 USD ($) extension	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	May 08, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 13, 2016
Debt Instrument [Line Items]
Pension liability			$ 131,000,000	$ 131,000,000
Total amount of debt			2,616,000,000	2,616,000,000
Fees incurred in connection with 2022 Notes offering				18,000,000	$ 0
Financing costs			46,000,000	94,000,000	0
Cash payments for reorganization items				32,000,000
GenOn Energy
Debt Instrument [Line Items]
Total amount of debt			1,921,000,000	1,921,000,000			$ 0
GenOn Americas Generation
Debt Instrument [Line Items]
Pension liability			0	0
Total amount of debt			695,000,000	695,000,000			$ 0
Financing costs				16,000,000	$ 0
Intercompany Revolver, GenOn Senior Notes, and GenOn Americas Generation Senior Notes [Member]
Debt Instrument [Line Items]
Total amount of debt			2,600,000,000	2,600,000,000
Pension plan
Debt Instrument [Line Items]
Pension liability			106,000,000	$ 106,000,000
Senior Notes
Debt Instrument [Line Items]
Interest expense not recorded due to bankruptcy			49,000,000
Senior Notes | GenOn Americas Generation
Debt Instrument [Line Items]
Interest expense not recorded due to bankruptcy			18,000,000
Senior Notes | Senior Secured First Lien Notes, due 2022
Debt Instrument [Line Items]
Percent of aggregate principal amount of 2022 Notes (as percent)		4.00%
Interest rate (as percent)						10.50%
Face amount						$ 550,000,000
Percent of aggregate principal amount of 2022 Notes plus accrued interest		$ 28,000,000
Fees incurred in connection with 2022 Notes offering			$ 18,000,000
Senior Notes | GenOn Senior Notes, due 2017 | GenOn Energy
Debt Instrument [Line Items]
Interest rate (as percent)			7.875%	7.875%				7.875%
Senior Notes | GenOn Senior Notes, due 2018 | GenOn Energy
Debt Instrument [Line Items]
Interest rate (as percent)			9.50%	9.50%				9.50%
Senior Notes | GenOn Senior Notes, due 2020 | GenOn Energy
Debt Instrument [Line Items]
Interest rate (as percent)			9.875%	9.875%				9.875%
Senior Notes | GenOn Americas Generation Senior Notes, due 2021 | GenOn Americas Generation
Debt Instrument [Line Items]
Interest rate (as percent)			8.50%	8.50%				8.50%
Senior Notes | GenOn Americas Generation Senior Notes, due 2031 | GenOn Americas Generation
Debt Instrument [Line Items]
Interest rate (as percent)			9.125%	9.125%				9.125%
Senior Notes | New Secured Notes
Debt Instrument [Line Items]
Amount of aggregate principal in debt financing sought			$ 900,000,000	$ 900,000,000
Backstop fee	$ 45,000,000
Backstop commitment fee (as percent)	5.00%
Term				5 years
Principal Owner | Letter of Credit | Intercompany Credit Agreement
Debt Instrument [Line Items]
Amount of borrowings			125,000,000	$ 125,000,000
NRG
Debt Instrument [Line Items]
Settlement cash consideration			261,300,000
Cancellation of equity interests, cash payment			75,000,000
2017 pension contributions				13,000,000
Transition services, annualized rate			$ 84,000,000
Transition services, period of services provided at no charge if settlement is approved			2 months
Transition services, number of optional extensions for services if settlement is approved | extension			2
Transition services, Period of optional extensions for services if settlement is approved			1 month
NRG | Senior Secured First Lien Notes, due 2022
Debt Instrument [Line Items]
Credit against amount owed under shared services agreement upon emergence from bankruptcy			$ 28,000,000	28,000,000
NRG | Senior Notes | Senior Secured First Lien Notes, due 2022
Debt Instrument [Line Items]
Percent of aggregate principal amount of 2022 Notes (as percent)			4.00%
NRG | Principal Owner | Restructuring Support Agreement, Credit Against Amounts Owed Prior to Petition Date Under Services Agreement
Debt Instrument [Line Items]
Receivable from related party			$ 28,000,000	$ 28,000,000

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Chapter 11 Cases (GenOn and GenOn Americas Generation) - Liabilities Subject to Compromise (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Reorganization [Line Items]
Accounts payable and accrued expenses	$ 46
Long-term debt, including current portion	2,616
Accrued interest	56
Pension and post-retirement liabilities	131
Other	13
Liabilities subject to compromise	2,862	$ 0
GenOn Americas Generation
Reorganization [Line Items]
Accounts payable and accrued expenses	9
Long-term debt, including current portion	695	0
Accrued interest	10
Pension and post-retirement liabilities	0
Other	7
Liabilities subject to compromise	$ 721	$ 0

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Chapter 11 Cases (GenOn and GenOn Americas Generation) - Reorganization Items (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reorganization [Line Items]
Legal and other professional advisory fees	$ (29)		$ (55)
Write-off of debt premiums and credit reserves	0		103
Reorganization items, net	(29)	$ 0	48	$ 0
GenOn Americas Generation
Reorganization [Line Items]
Legal and other professional advisory fees	0		(1)
Write-off of debt premiums and credit reserves	0		43
Reorganization items, net	$ 0	$ 0	$ 42	$ 0

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Dispositions (GenOn and GenOn Americas Generation) (Details) allowance in Millions, $ in Millions								3 Months Ended			9 Months Ended
	Sep. 26, 2016 USD ($)	Jul. 12, 2016 USD ($)	May 12, 2016 USD ($) MW	Mar. 01, 2016 USD ($)	Feb. 02, 2016 USD ($) installment	Nov. 24, 2015 USD ($) MW	Nov. 09, 2015 USD ($) MW	Mar. 31, 2017 USD ($) allowance	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($) MW	Sep. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of emission allowances											$ 0.0	$ 36.0
Proceeds from disposition											$ 0.0	563.0
Generation capacity (in MW) | MW											15,395
Potrero LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition	$ 86.0
Closing costs	8.0
Escrow	4.0
Potrero LLC | Cash
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition	$ 74.0
Aurora Generating Station
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition		$ 369.0	$ 365.0
Gain on disposition									$ 188.0
Generation capacity (in MW) | MW			878
Adjustments primarily for base residual auction results and estimated working capital		$ 4.0
Aurora Generating Station | RA Generation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cap on guaranty payment			$ 365.0
Aurora Generating Station | RA Generation | 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cap on guaranty payment											$ 183.0
Aurora Generating Station | RA Generation | 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cap on guaranty payment											91.0
Seward Generating Station
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition					$ 75.0	$ 75.0					1.0
Generation capacity (in MW) | MW						525
Cash on hand transferred to buyer					3.0
Amount of payments after disposal					$ 5.0
Number of annual installments | installment					5
Seward Generating Station | Robindale Energy Services, Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Commitment of future inventory purchases					$ 13.0
Seward Generating Station | Environmental Testing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of payments after disposal					2.5
Seward Generating Station | Annual
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of payments after disposal					$ 1.0
Shelby County Energy Center, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition				$ 46.0			$ 46.0
Gain on disposition										$ 29.0
Generation capacity (in MW) | MW							352
Future revenue rights										$ 10.0
GenOn Americas Generation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition											$ 0.0	$ 76.0
Generation capacity (in MW) | MW											6,878
GenOn Americas Generation | Potrero LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition									$ 74.0
NRG Power Marketing LLC | GenOn Energy Management
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Emission credit allowances | allowance								1.3
Proceeds from sale of emission allowances								$ 18.0
Gain on sale of emission allowances								$ 1.0

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Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - CV and FV of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Carrying Amount | GenOn Americas Generation
Fair Value of Financial Instruments
Long-term debt, including current portion		$ 745
Fair Value | Level 2 | GenOn Americas Generation
Fair Value of Financial Instruments
Long-term debt, including current portion		570
Non-affiliated Entity | Carrying Amount
Fair Value of Financial Instruments
Long-term debt, including current portion		2,752
Non-affiliated Entity | Fair Value
Fair Value of Financial Instruments
Long-term debt, including current portion		1,946
Non-affiliated Entity | Fair Value | Level 2
Fair Value of Financial Instruments
Long-term debt, including current portion		1,850
Non-affiliated Entity | Fair Value | Level 3
Fair Value of Financial Instruments
Long-term debt, including current portion		$ 96
Affiliated Entity | Carrying Amount
Fair Value of Financial Instruments
Long-term debt, including current portion	$ 125
Affiliated Entity | Fair Value | Level 3
Fair Value of Financial Instruments
Long-term debt, including current portion	$ 125

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Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Recurring FV (Details) - USD ($)		3 Months Ended			9 Months Ended			12 Months Ended
		Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from Level 1 to Level 2		$ 0			$ 0			$ 0
Transfers from Level 2 to Level 1		0			0			0
GenOn Americas Generation
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from Level 1 to Level 2		0			0			0
Transfers from Level 2 to Level 1		0			0			0
GenOn Mid-Atlantic
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from Level 1 to Level 2		0			0			0
Transfers from Level 2 to Level 1		0			0			0
Level 3 | Derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	[1]	(2,000,000)		$ (11,000,000)	(1,000,000)		$ (12,000,000)	(12,000,000)
Total (losses)/gains included in earnings — realized/unrealized	[1]	(1,000,000)		7,000,000	(2,000,000)		6,000,000
Purchases	[1]	(2,000,000)		(1,000,000)	(2,000,000)		1,000,000
Transfers out of Level 3	[1],[2]	0		1,000,000	0		1,000,000
Ending balance	[1]	(5,000,000)		(4,000,000)	(5,000,000)		(4,000,000)	(1,000,000)
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	[1]	(1,000,000)		5,000,000	(3,000,000)		(3,000,000)
Level 3 | GenOn Americas Generation | Derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	[3]	0		1,000,000	0		1,000,000	1,000,000
Total (losses)/gains included in earnings — realized/unrealized	[3]	(1,000,000)		0	(1,000,000)		(1,000,000)
Purchases	[3]	0		(1,000,000)	0		0
Transfers out of Level 3	[3]	0		1,000,000	0		1,000,000
Ending balance	[3]	(1,000,000)		1,000,000	(1,000,000)		1,000,000	0
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	[1]	(1,000,000)		0	(1,000,000)		0
Level 3 | GenOn Mid-Atlantic | Derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	[4]	0		1,000,000	0		2,000,000	2,000,000
Total (losses)/gains included in earnings — realized/unrealized	[4]	(1,000,000)		0	(1,000,000)		(1,000,000)
Ending balance	[4]	(1,000,000)		1,000,000	(1,000,000)		1,000,000	0
(Losses)/gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of September 30	[1]	(1,000,000)		$ 0	(1,000,000)		$ 0
Fair Value, Measurements, Recurring
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		8,000,000	[5]		8,000,000	[5]		10,000,000	[6]
Fair Value, Measurements, Recurring | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		56,000,000			56,000,000			124,000,000
Derivative liabilities		41,000,000			41,000,000			122,000,000
Fair Value, Measurements, Recurring | Commodity contracts | GenOn Americas Generation
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		94,000,000			94,000,000			214,000,000
Derivative liabilities		94,000,000			94,000,000			217,000,000
Fair Value, Measurements, Recurring | Commodity contracts | GenOn Mid-Atlantic
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		12,000,000			12,000,000			48,000,000
Derivative liabilities		14,000,000			14,000,000			46,000,000
Fair Value, Measurements, Recurring | Level 1
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		8,000,000	[5],[7]		8,000,000	[5],[7]		10,000,000	[6],[8]
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	[7]		0	[7]		0	[8]
Derivative liabilities		0	[7]		0	[7]		0	[8]
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts | GenOn Americas Generation
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	[9]		0	[9]		0	[10]
Derivative liabilities		0	[9]		0	[9]		0	[10]
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts | GenOn Mid-Atlantic
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	[11]		0	[11]		0	[12]
Derivative liabilities		0	[11]		0	[11]		0	[12]
Fair Value, Measurements, Recurring | Level 2
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		0	[5],[7]		0	[5],[7]		0	[6],[8]
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		56,000,000	[7]		56,000,000	[7]		122,000,000	[8]
Derivative liabilities		36,000,000	[7]		36,000,000	[7]		119,000,000	[8]
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts | GenOn Americas Generation
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		89,000,000	[9]		89,000,000	[9]		209,000,000	[10]
Derivative liabilities		88,000,000	[9]		88,000,000	[9]		212,000,000	[10]
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts | GenOn Mid-Atlantic
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		12,000,000	[11]		12,000,000	[11]		47,000,000	[12]
Derivative liabilities		13,000,000	[11]		13,000,000	[11]		45,000,000	[12]
Fair Value, Measurements, Recurring | Level 3
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets		0	[5]		0	[5]		0	[6]
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0			0			2,000,000
Derivative liabilities		5,000,000			5,000,000			3,000,000
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts | GenOn Americas Generation
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		5,000,000			5,000,000			5,000,000
Derivative liabilities		6,000,000			6,000,000			5,000,000
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts | GenOn Mid-Atlantic
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0			0			1,000,000
Derivative liabilities		$ 1,000,000			$ 1,000,000			$ 1,000,000

[1] Consists of derivative assets and liabilities, net.

[2] Transfers out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

[3] Consists of derivative assets and liabilities, net.

[4] Consists of derivative assets and liabilities, net.

[5] Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees.

[6] Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees.

[7] There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

[8] There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

[9] There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

[10] There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

[11] There were no transfers between Levels 1 and 2 during the three and nine months ended September 30, 2017.

[12] There were no transfers between Levels 1 and 2 during the year ended December 31, 2016.

XML

Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Derivative FV (Details)	Sep. 30, 2017 USD ($) $ / MWh	Dec. 31, 2016 USD ($) $ / T $ / MWh
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Contracts valued with prices provided by models and other valuation techniques, percent of derivative assets	0.00%
Contracts valued with prices provided by models and other valuation techniques, percent of derivative liability	12.00%
Credit reserve balance	$ 0	$ 1,000,000
Cash collateral paid	72,000,000
NRG
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cash collateral paid	25,000,000
Commodity contracts | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	56,000,000	124,000,000
Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	0	2,000,000
Derivative liabilities	5,000,000	3,000,000
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets		1,000,000
Derivative liabilities		$ 0
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Low | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		29
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | High | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		59
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Weighted Average | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		43
Coal Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets		$ 0
Derivative liabilities		$ 1,000,000
Coal Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Low | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / T		42
Coal Contracts | Commodity contracts | Fair Value, Measurements, Recurring | High | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / T		51
Coal Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Weighted Average | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / T		45
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	0	$ 1,000,000
Derivative liabilities	$ 5,000,000	$ 2,000,000
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Low | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	(3)	(2)
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | High | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	1	3
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Weighted Average | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	0	0
GenOn Americas Generation
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Contracts valued with prices provided by models and other valuation techniques, percent of derivative assets	5.00%
Contracts valued with prices provided by models and other valuation techniques, percent of derivative liability	6.00%
Credit reserve balance	$ 0	$ 1,000,000
Cash collateral paid	70,000,000
GenOn Americas Generation | NRG
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Cash collateral paid	25,000,000
GenOn Americas Generation | Commodity contracts | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	94,000,000	214,000,000
GenOn Americas Generation | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	5,000,000	5,000,000
Derivative liabilities	6,000,000	5,000,000
GenOn Americas Generation | Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets		1,000,000
Derivative liabilities		$ 0
GenOn Americas Generation | Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Low | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		29
GenOn Americas Generation | Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | High | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		59
GenOn Americas Generation | Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Weighted Average | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		43
GenOn Americas Generation | Coal Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets		$ 1,000,000
Derivative liabilities		$ 1,000,000
GenOn Americas Generation | Coal Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Low | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / T		42
GenOn Americas Generation | Coal Contracts | Commodity contracts | Fair Value, Measurements, Recurring | High | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / T		51
GenOn Americas Generation | Coal Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Weighted Average | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / T		45
GenOn Americas Generation | FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	5,000,000	$ 3,000,000
Derivative liabilities	$ 6,000,000	$ 4,000,000
GenOn Americas Generation | FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Low | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	(3)	(2)
GenOn Americas Generation | FTRs | Commodity contracts | Fair Value, Measurements, Recurring | High | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	1	3
GenOn Americas Generation | FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Weighted Average | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	0	0
GenOn Mid-Atlantic
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Contracts valued with prices provided by models and other valuation techniques, percent of derivative assets	0.00%
Contracts valued with prices provided by models and other valuation techniques, percent of derivative liability	7.00%
Cash collateral paid	$ 0
Cash collateral received in support of energy risk management activities	0
GenOn Mid-Atlantic | Commodity contracts | Fair Value, Measurements, Recurring
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	12,000,000	$ 48,000,000
GenOn Mid-Atlantic | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	0	1,000,000
Derivative liabilities	1,000,000	1,000,000
GenOn Mid-Atlantic | Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	0	1,000,000
Derivative liabilities	0	$ 0
GenOn Mid-Atlantic | Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Low | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		29
GenOn Mid-Atlantic | Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | High | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		59
GenOn Mid-Atlantic | Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Weighted Average | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Forward market price | $ / MWh		43
GenOn Mid-Atlantic | FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative assets	0	$ 0
Derivative liabilities	$ 1,000,000	$ 1,000,000
GenOn Mid-Atlantic | FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Low | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	0	0
GenOn Mid-Atlantic | FTRs | Commodity contracts | Fair Value, Measurements, Recurring | High | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	1	1
GenOn Mid-Atlantic | FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Weighted Average | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Auction prices | $ / MWh	0	0

XML

Fair Value of Financial Instruments (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Credit Risk (Details)	9 Months Ended
	Sep. 30, 2017 USD ($)
Concentration of credit risk
Counterparty credit exposure	$ 47,000,000
Collateral held (cash and letters of credit) against counterparty credit exposure	0
Counterparty credit exposure, net	$ 47,000,000
Counterparty credit exposure before collateral expected to roll off by the end of 2014 (as a percent)	94.00%
Net exposure (as a percent)	100.00%	[1],[2]
Counterparty credit risk exposure percentage (more than)	10.00%
Aggregate counterparty credit risk exposure for counterparties representing exposure above threshold percentage	$ 41,000,000
Investment grade
Concentration of credit risk
Net exposure (as a percent)	96.00%	[1],[2]
Non-Investment grade/Non-rated
Concentration of credit risk
Net exposure (as a percent)	4.00%	[1],[2]
Utilities, energy merchants, marketers and other
Concentration of credit risk
Net exposure (as a percent)	100.00%	[1],[2]
GenOn Americas Generation
Concentration of credit risk
Counterparty credit exposure	$ 47,000,000
Collateral held (cash and letters of credit) against counterparty credit exposure	0
Counterparty credit exposure, net	$ 47,000,000
Counterparty credit exposure before collateral expected to roll off by the end of 2014 (as a percent)	94.00%
Net exposure (as a percent)	100.00%	[1],[2]
Aggregate counterparty credit risk exposure for counterparties representing exposure above threshold percentage	$ 41,000,000
GenOn Americas Generation | Investment grade
Concentration of credit risk
Net exposure (as a percent)	96.00%	[1],[2]
GenOn Americas Generation | Non-Investment grade/Non-rated
Concentration of credit risk
Net exposure (as a percent)	4.00%	[1],[2]
GenOn Americas Generation | Utilities, energy merchants, marketers and other
Concentration of credit risk
Net exposure (as a percent)	100.00%	[1],[2]
GenOn Mid-Atlantic
Concentration of credit risk
Counterparty credit exposure	$ 0
Net exposure (as a percent)	0.00%	[1],[2]
Aggregate counterparty credit risk exposure for counterparties representing exposure above threshold percentage	$ 0
GenOn Mid-Atlantic | Investment grade
Concentration of credit risk
Net exposure (as a percent)	0.00%	[1],[2]
GenOn Mid-Atlantic | Non-Investment grade/Non-rated
Concentration of credit risk
Net exposure (as a percent)	0.00%	[1],[2]
GenOn Mid-Atlantic | Utilities, energy merchants, marketers and other
Concentration of credit risk
Net exposure (as a percent)	0.00%	[1],[2]

[1] Counterparty credit exposure excludes transportation contracts because of the unavailability of market prices.

[2] The figures in the tables above exclude potential counterparty credit exposure related to RTOs, ISOs, registered commodity exchanges and certain long term contracts.

XML

Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Underlying Derivative (Details) T in Millions, MWh in Millions, MMBTU in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017 MWh MMBTU T	Dec. 31, 2016 MWh MMBTU T
Long | Coal | Short Ton
Derivative
Total Volume, mass | T	2	5
Long | Coal | Short Ton | GenOn Americas Generation
Derivative
Total Volume, mass | T	1	4
Long | Coal | Short Ton | GenOn Mid-Atlantic
Derivative
Total Volume, mass | T	1	4
Long | Natural Gas | MMBtu
Derivative
Net notional volume, buy (sell) | MMBTU	72	138
Long | Natural Gas | MMBtu | GenOn Americas Generation
Derivative
Net notional volume, buy (sell) | MMBTU	13	30
Long | Natural Gas | MMBtu | GenOn Mid-Atlantic
Derivative
Net notional volume, buy (sell) | MMBTU	13	23
Short | Power | MWh
Derivative
Net notional volume, buy (sell) | MWh	12	35
Short | Power | MWh | GenOn Americas Generation
Derivative
Net notional volume, buy (sell) | MWh	3	12
Short | Power | MWh | GenOn Mid-Atlantic
Derivative
Net notional volume, buy (sell) | MWh	3	11

XML

Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - FV of Derivatives (Details) - Derivatives Not Designated as Cash Flow Hedges - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative
Derivative assets	$ 56	$ 124
Derivative liabilities	41	122
GenOn Americas Generation
Derivative
Derivative assets	94	214
Derivative liabilities	94	217
GenOn Mid-Atlantic
Derivative
Derivative assets	12	48
Derivative liabilities	14	46
Commodity contracts current
Derivative
Derivative assets	39	108
Derivative liabilities	35	105
Commodity contracts current | GenOn Americas Generation
Derivative
Derivative assets	69	180
Derivative liabilities	71	185
Commodity contracts current | GenOn Mid-Atlantic
Derivative
Derivative assets	10	44
Derivative liabilities	14	44
Commodity contracts long-term
Derivative
Derivative assets	17	16
Derivative liabilities	6	17
Commodity contracts long-term | GenOn Americas Generation
Derivative
Derivative assets	25	34
Derivative liabilities	23	32
Commodity contracts long-term | GenOn Mid-Atlantic
Derivative
Derivative assets	2	4
Derivative liabilities	$ 0	$ 2

XML

Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Offsetting Derivatives (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Derivative liabilities
Cash Collateral (Held) / Posted	$ 72,000,000
Commodity contracts
Total derivative instruments
Gross Amounts of Recognized Assets / Liabilities	15,000,000	$ 2,000,000
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(4,000,000)	(13,000,000)
Net Amount	19,000,000	15,000,000
GenOn Americas Generation
Derivative liabilities
Cash Collateral (Held) / Posted	70,000,000
GenOn Americas Generation | Commodity contracts
Total derivative instruments
Gross Amounts of Recognized Assets / Liabilities	0	(3,000,000)
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	(4,000,000)	(13,000,000)
Net Amount	4,000,000	10,000,000
GenOn Mid-Atlantic
Derivative assets
Cash Collateral (Held) / Posted	0
Derivative liabilities
Cash Collateral (Held) / Posted	0
GenOn Mid-Atlantic | Commodity contracts
Total derivative instruments
Gross Amounts of Recognized Assets / Liabilities	(2,000,000)	2,000,000
Derivative Instruments	0	0
Cash Collateral (Held) / Posted	0	0
Net Amount	(2,000,000)	2,000,000
Non-affiliated Entity
Derivative liabilities
Cash Collateral (Held) / Posted	47,000,000	53,000,000
Non-affiliated Entity | Commodity contracts
Derivative assets
Gross Amounts of Recognized Assets / Liabilities	45,000,000	70,000,000
Derivative Instruments	(15,000,000)	(39,000,000)
Cash Collateral (Held) / Posted	0	0
Net Amount	30,000,000	31,000,000
Derivative liabilities
Gross Amounts of Recognized Assets / Liabilities	(28,000,000)	(56,000,000)
Derivative Instruments	15,000,000	39,000,000
Cash Collateral (Held) / Posted	2,000,000	1,000,000
Net Amount	(11,000,000)	(16,000,000)
Non-affiliated Entity | GenOn Americas Generation
Derivative liabilities
Cash Collateral (Held) / Posted	45,000,000	51,000,000
Non-affiliated Entity | GenOn Americas Generation | Commodity contracts
Derivative assets
Gross Amounts of Recognized Assets / Liabilities	45,000,000	70,000,000
Derivative Instruments	(15,000,000)	(39,000,000)
Cash Collateral (Held) / Posted	0	0
Net Amount	30,000,000	31,000,000
Derivative liabilities
Gross Amounts of Recognized Assets / Liabilities	(28,000,000)	(56,000,000)
Derivative Instruments	15,000,000	39,000,000
Cash Collateral (Held) / Posted	2,000,000	1,000,000
Net Amount	(11,000,000)	(16,000,000)
Affiliated Entity
Derivative liabilities
Cash Collateral (Held) / Posted	25,000,000	79,000,000
Affiliated Entity | Commodity contracts
Derivative assets
Gross Amounts of Recognized Assets / Liabilities	11,000,000	54,000,000
Derivative Instruments	(11,000,000)	(54,000,000)
Cash Collateral (Held) / Posted	0	0
Net Amount	0	0
Derivative liabilities
Gross Amounts of Recognized Assets / Liabilities	(13,000,000)	(66,000,000)
Derivative Instruments	11,000,000	54,000,000
Cash Collateral (Held) / Posted	2,000,000	12,000,000
Net Amount	0	0
Affiliated Entity | GenOn Americas Generation
Derivative liabilities
Cash Collateral (Held) / Posted	25,000,000	79,000,000
Affiliated Entity | GenOn Americas Generation | Commodity contracts
Derivative assets
Gross Amounts of Recognized Assets / Liabilities	49,000,000	144,000,000
Derivative Instruments	(49,000,000)	(144,000,000)
Cash Collateral (Held) / Posted	0	0
Net Amount	0	0
Derivative liabilities
Gross Amounts of Recognized Assets / Liabilities	(66,000,000)	(161,000,000)
Derivative Instruments	49,000,000	144,000,000
Cash Collateral (Held) / Posted	2,000,000	12,000,000
Net Amount	(15,000,000)	(5,000,000)
Affiliated Entity | GenOn Mid-Atlantic | Commodity contracts
Derivative assets
Gross Amounts of Recognized Assets / Liabilities	12,000,000	48,000,000
Derivative Instruments	(12,000,000)	(46,000,000)
Cash Collateral (Held) / Posted	0	0
Net Amount	0	2,000,000
Derivative liabilities
Gross Amounts of Recognized Assets / Liabilities	(14,000,000)	(46,000,000)
Derivative Instruments	12,000,000	46,000,000
Cash Collateral (Held) / Posted	0	0
Net Amount	$ (2,000,000)	$ 0

XML

Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Mark to Market (Details) - USD ($)	1 Months Ended	3 Months Ended				9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges		$ 9,000,000		$ (29,000,000)		$ 7,000,000	$ (145,000,000)
Net unrealized (losses)/gains on open positions related to economic hedges		(28,000,000)		(68,000,000)		9,000,000	(43,000,000)
Total impact to statements of operations		(19,000,000)		(97,000,000)		16,000,000	(188,000,000)
Impact of derivative instruments to statement of operations
Total impact to statements of operations		(19,000,000)		(97,000,000)		16,000,000	(188,000,000)
Exchange clearing account, initial collateral posted	$ 20,000,000
Credit Risk Related Contingent Features
Collateral required for contracts with adequate assurance clauses in net liability positions		1,000,000				1,000,000
Collateral required for contracts with credit rating contingent features in net liability position		0				0
Collateral due on net liability position that has not been called by a certain marginable agreement counterparty		0				0
GenOn Americas Generation
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges		11,000,000		(46,000,000)		2,000,000	(165,000,000)
Net unrealized (losses)/gains on open positions related to economic hedges		(13,000,000)		6,000,000		6,000,000	(23,000,000)
Total impact to statements of operations		(2,000,000)		(40,000,000)		8,000,000	(188,000,000)
Impact of derivative instruments to statement of operations
Total impact to statements of operations		(2,000,000)		(40,000,000)		8,000,000	(188,000,000)
Credit Risk Related Contingent Features
Collateral required for contracts with adequate assurance clauses in net liability positions		1,000,000				1,000,000
Collateral required for contracts with credit rating contingent features in net liability position		0				0
Collateral due on net liability position that has not been called by a certain marginable agreement counterparty		0				0
GenOn Mid-Atlantic
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges		7,000,000		(47,000,000)		(3,000,000)	(146,000,000)
Net unrealized (losses)/gains on open positions related to economic hedges		(12,000,000)		4,000,000		1,000,000	(18,000,000)
Total impact to statements of operations		(5,000,000)		(43,000,000)		(2,000,000)	(164,000,000)
Impact of derivative instruments to statement of operations
Total impact to statements of operations		(5,000,000)		(43,000,000)		(2,000,000)	(164,000,000)
Revenue from operations — energy commodities
Unrealized mark-to-market results
Total impact to statements of operations		(23,000,000)		(142,000,000)		7,000,000	(233,000,000)
Impact of derivative instruments to statement of operations
Total impact to statements of operations		(23,000,000)		(142,000,000)		7,000,000	(233,000,000)
Revenue from operations — energy commodities | GenOn Americas Generation
Unrealized mark-to-market results
Total impact to statements of operations		(6,000,000)		(75,000,000)		(1,000,000)	(228,000,000)
Impact of derivative instruments to statement of operations
Total impact to statements of operations		(6,000,000)		(75,000,000)		(1,000,000)	(228,000,000)
Revenue from operations — energy commodities | GenOn Mid-Atlantic
Unrealized mark-to-market results
Total impact to statements of operations		(10,000,000)		(83,000,000)		(2,000,000)	(203,000,000)
Impact of derivative instruments to statement of operations
Total impact to statements of operations		(10,000,000)		(83,000,000)		(2,000,000)	(203,000,000)
Cost of operations
Unrealized mark-to-market results
Total impact to statements of operations		4,000,000		45,000,000		9,000,000	45,000,000
Impact of derivative instruments to statement of operations
Total impact to statements of operations		4,000,000		45,000,000		9,000,000	45,000,000
Cost of operations | GenOn Americas Generation
Unrealized mark-to-market results
Total impact to statements of operations		4,000,000		35,000,000		9,000,000	40,000,000
Impact of derivative instruments to statement of operations
Total impact to statements of operations		4,000,000		35,000,000		9,000,000	40,000,000
Cost of operations | GenOn Mid-Atlantic
Unrealized mark-to-market results
Total impact to statements of operations		5,000,000		40,000,000		0	39,000,000
Impact of derivative instruments to statement of operations
Total impact to statements of operations		$ 5,000,000		40,000,000		$ 0	$ 39,000,000
Realized Gain
Impact of derivative instruments to statement of operations
Amount realized			$ 5,000,000	98,000,000	$ 38,000,000
Realized Gain | GenOn Americas Generation
Impact of derivative instruments to statement of operations
Amount realized			5,000,000	50,000,000	35,000,000
Realized Gain | GenOn Mid-Atlantic
Impact of derivative instruments to statement of operations
Amount realized			5,000,000	50,000,000	35,000,000
Realized Gain | 2016
Impact of derivative instruments to statement of operations
Amount realized				82,000,000	18,000,000
Realized Gain | 2016 | GenOn Americas Generation
Impact of derivative instruments to statement of operations
Amount realized					16,000,000
Realized Gain | 2016 | GenOn Mid-Atlantic
Impact of derivative instruments to statement of operations
Amount realized					16,000,000
Realized Gain | 2017
Impact of derivative instruments to statement of operations
Amount realized			4,000,000	13,000,000	19,000,000
Realized Gain | 2017 | GenOn Americas Generation
Impact of derivative instruments to statement of operations
Amount realized			4,000,000	46,000,000	19,000,000
Realized Gain | 2017 | GenOn Mid-Atlantic
Impact of derivative instruments to statement of operations
Amount realized			4,000,000	46,000,000	19,000,000
Realized Gain | 2018
Impact of derivative instruments to statement of operations
Amount realized			1,000,000	3,000,000	$ 1,000,000
Realized Gain | 2018 | GenOn Americas Generation
Impact of derivative instruments to statement of operations
Amount realized			1,000,000	4,000,000
Realized Gain | 2018 | GenOn Mid-Atlantic
Impact of derivative instruments to statement of operations
Amount realized			$ 1,000,000	$ 4,000,000

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Impairments (GenOn) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Impairment losses	$ 0	$ 0		$ 0	$ 59
Mandalay operating unit
Property, Plant and Equipment [Line Items]
Impairment losses			$ 16
Ormond Beach operating unit
Property, Plant and Equipment [Line Items]
Impairment losses			$ 43

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Debt and Capital Leases (GenOn, GenOn Americas Generation, and GenOn Mid-Atlantic) (Details) - USD ($)						9 Months Ended
		Oct. 27, 2017	Jul. 14, 2017	Jun. 28, 2017	May 05, 2017	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Feb. 28, 2017	Jan. 27, 2017	Dec. 31, 2016	Dec. 13, 2016
Debt Instrument [Line Items]
Debt and capital leases						$ 2,000,000					$ 2,754,000,000
Less: Liabilities subject to compromise						(2,616,000,000)
Less: current maturities						1,000,000					704,000,000
Total long-term debt and capital leases						1,000,000					2,050,000,000
Line of credit payment						130,000,000	$ 0
Prepaid rent — non-current						352,000,000					245,000,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 300,000,000
Percent of letters of credit provided required to be cash collateralized (as percent)			101.00%
Letters of credit						6,000,000
Intercompany Credit Agreement | NRG Energy
Debt Instrument [Line Items]
Maximum borrowing capacity						500,000,000
Intercompany Credit Agreement | Letter of Credit | NRG Energy
Debt Instrument [Line Items]
Letters of credit						103,000,000					272,000,000
GenOn Americas Generation
Debt Instrument [Line Items]
Debt and capital leases						0					745,000,000
Premiums	[1]					0					50,000,000
Less: Liabilities subject to compromise						(695,000,000)					0
Total long-term debt and capital leases						0					745,000,000
Line of credit payment						130,000,000	0
Payment for intercompany revolver						125,000,000	0
Prepaid rent — non-current						278,000,000					204,000,000
GenOn Americas Generation | Senior Notes | GenOn Americas Generation Senior Notes, due 2021
Debt Instrument [Line Items]
Debt and capital leases						$ 366,000,000					366,000,000
Interest rate (as percent)						8.50%						8.50%
GenOn Americas Generation | Senior Notes | GenOn Americas Generation Senior Notes, due 2031
Debt Instrument [Line Items]
Debt and capital leases						$ 329,000,000					329,000,000
Interest rate (as percent)						9.125%						9.125%
GenOn Americas Generation | Intercompany Credit Agreement | Letter of Credit | NRG Energy
Debt Instrument [Line Items]
Letters of credit						$ 21,000,000					199,000,000
GenOn Energy
Debt Instrument [Line Items]
Debt and capital leases						2,000,000					2,009,000,000
Premiums	[1]					0					81,000,000
Less: Liabilities subject to compromise						(1,921,000,000)					0
GenOn Energy | Senior Notes | GenOn Senior Notes, due 2017
Debt Instrument [Line Items]
Debt and capital leases						$ 691,000,000					691,000,000
Interest rate (as percent)						7.875%						7.875%
GenOn Energy | Senior Notes | GenOn Senior Notes, due 2018
Debt Instrument [Line Items]
Debt and capital leases						$ 649,000,000					649,000,000
Interest rate (as percent)						9.50%						9.50%
GenOn Energy | Senior Notes | GenOn Senior Notes, due 2020
Debt Instrument [Line Items]
Debt and capital leases						$ 490,000,000					490,000,000
Interest rate (as percent)						9.875%						9.875%
GenOn Energy | Other liabilities
Debt Instrument [Line Items]
Debt and capital leases	[2]					$ 91,000,000					96,000,000
GenOn Energy | GenOn capital lease
Debt Instrument [Line Items]
Debt and capital leases						2,000,000					2,000,000
GenOn Mid-Atlantic
Debt Instrument [Line Items]
Line of credit payment						130,000,000	0
Fees										$ 1,000,000
Payment for intercompany revolver						125,000,000	$ 0
Prepaid rent — non-current						280,000,000					204,000,000
GenOn Mid-Atlantic | Intercompany Credit Agreement | Subsequent event
Debt Instrument [Line Items]
Written notice period for termination of letters of credit		60 days
Period prior to termination date of letters of credit to provide alternative qualifying credit support		30 days
GenOn Mid-Atlantic | Intercompany Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Payment for intercompany revolver				$ 125,000,000
Payment to owner lessors				$ 2,700,000
Prepaid rent — non-current								$ 125,000,000
GenOn Mid-Atlantic | Intercompany Credit Agreement | Letter of Credit | NRG Energy
Debt Instrument [Line Items]
Letters of credit						$ 1,000,000					$ 128,000,000
Amount of borrowings									$ 125,000,000
GenOn Mid-Atlantic | Intercompany Credit Agreement | Letter of Credit | GenOn Energy
Debt Instrument [Line Items]
Payment for intercompany revolver					$ 125,000,000

[1] Premiums were written-off at Petition Date in accordance with ASC 852, Reorganizations.

[2] Debt financing liabilities associated with the Long Term Service Agreements for the Choctaw and Hunterstown facilities.

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Income Taxes (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income tax provision
Income before income taxes	$ 72,000,000	$ 284,000,000	$ 49,000,000	$ 268,000,000
Income tax expense	$ 0	$ 21,000,000	$ 7,000,000	$ 20,000,000
Effective tax rate	0.00%	7.40%	14.30%	7.50%
Statutory tax rate (as a percent)	35.00%	35.00%	35.00%	35.00%
GenOn Americas Generation
Income tax provision
Income before income taxes	$ 32,000,000	$ 132,000,000	$ 48,000,000	$ 149,000,000
Income tax expense	0	0	0	0
GenOn Americas Generation | Pro Forma
Income tax provision
Income tax expense	0	0	0	0
GenOn Mid-Atlantic
Income tax provision
Income before income taxes	(6,000,000)	51,000,000	(33,000,000)	57,000,000
Income tax expense	0	0	0	0
GenOn Mid-Atlantic | Pro Forma
Income tax provision
Income tax expense	$ 0	$ 23,000,000	$ 0	$ 25,000,000

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Related Party Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Narrative (Details)	3 Months Ended		4 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) extension	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transaction
Net exposure under agreements	$ 47,000,000		$ 47,000,000	$ 47,000,000
NRG
Related Party Transaction
Transition services, annualized rate			$ 84,000,000
Transition services, period of services provided at no charge if settlement is approved			2 months
Transition services, number of optional extensions for services if settlement is approved | extension			2
Transition services, Period of optional extensions for services if settlement is approved			1 month
NRG | Senior Secured First Lien Notes, due 2022
Related Party Transaction
Credit against amount owed under shared services agreement upon emergence from bankruptcy	28,000,000		$ 28,000,000	28,000,000
GenOn Americas Generation
Related Party Transaction
Net exposure under agreements	47,000,000		47,000,000	47,000,000
NRG
Related Party Transaction
Annual fees under Services Agreement				193,000,000
Net exposure under agreements	0		0	0
NRG | Intercompany Credit Agreement
Related Party Transaction
Maximum borrowing capacity	500,000,000		500,000,000	500,000,000
NRG | Letter of Credit | Intercompany Credit Agreement
Related Party Transaction
Letters of credit	103,000,000		103,000,000	103,000,000			$ 272,000,000
NRG | Letter of Credit | Restructuring Support Agreement, Letter of Credit Credit Facility
Related Party Transaction
Maximum borrowing capacity	330,000,000		$ 330,000,000	330,000,000
Percent of letters of credit provided required to be cash collateralized (as percent)			103.00%
NRG | Restructuring Support Agreement, Credit Against Amounts Owed Prior to Petition Date Under Services Agreement
Related Party Transaction
Receivable from related party	28,000,000		$ 28,000,000	28,000,000		$ 28,000,000
NRG | GenOn Americas Generation | Letter of Credit | Intercompany Credit Agreement
Related Party Transaction
Letters of credit	21,000,000		21,000,000	21,000,000			199,000,000
NRG | GenOn Mid-Atlantic | Letter of Credit | Intercompany Credit Agreement
Related Party Transaction
Letters of credit	1,000,000		1,000,000	1,000,000			128,000,000
Loans outstanding	125,000,000		125,000,000	125,000,000			0
Affiliated Entity
Related Party Transaction
General and administrative	14,000,000	$ 46,000,000		100,000,000	$ 139,000,000
Affiliated Entity | GenOn Americas Generation
Related Party Transaction
General and administrative	9,000,000	21,000,000		53,000,000	62,000,000
Note receivable	318,000,000		318,000,000	318,000,000			315,000,000
Affiliated Entity | GenOn Mid-Atlantic
Related Party Transaction
General and administrative	4,000,000	$ 15,000,000		42,000,000	45,000,000
GenOn Energy Holdings | GenOn Americas Generation
Related Party Transaction
Net interest income				0	$ 0
Accounts receivable - affiliate	50,000,000		50,000,000	50,000,000			77,000,000
Accounts payable - affiliate	$ 43,000,000		$ 43,000,000	$ 43,000,000			$ 43,000,000

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Related Party Transactions (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) - Schedule of Costs Incurred (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Affiliated Entity
Related Party Transaction
General and administrative	$ 14	$ 46	$ 100	$ 139
GenOn Americas Generation | Genon
Related Party Transaction
Total allocated costs	9	21	52	64
GenOn Americas Generation | Affiliated Entity
Related Party Transaction
General and administrative	9	21	53	62
GenOn Americas Generation | Allocated cost of operations | Genon
Related Party Transaction
Total allocated costs	0	0	(1)	2
GenOn Mid-Atlantic | Genon
Related Party Transaction
Total allocated costs	5	16	44	47
GenOn Mid-Atlantic | Affiliated Entity
Related Party Transaction
General and administrative	4	15	42	45
GenOn Mid-Atlantic | Allocated cost of operations | Genon
Related Party Transaction
Total allocated costs	$ 1	$ 1	$ 2	$ 2

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Commitments and Contingencies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Details) shares in Thousands	1 Months Ended
	Jun. 30, 2013 case	Sep. 30, 2017 shares	Dec. 13, 2016	May 31, 2016 case	Jul. 31, 2011 case
GenOn Energy | Senior Notes | GenOn Senior Notes, due 2017
Chapter Eleven Proceedings
Interest rate (as percent)		7.875%	7.875%
GenOn Energy | Senior Notes | GenOn Senior Notes, due 2018
Chapter Eleven Proceedings
Interest rate (as percent)		9.50%	9.50%
GenOn Energy | Senior Notes | GenOn Senior Notes, due 2020
Chapter Eleven Proceedings
Interest rate (as percent)		9.875%	9.875%
GenOn Americas Generation | Senior Notes | GenOn Americas Generation Senior Notes, due 2021
Chapter Eleven Proceedings
Interest rate (as percent)		8.50%	8.50%
GenOn Americas Generation | Senior Notes | GenOn Americas Generation Senior Notes, due 2031
Chapter Eleven Proceedings
Interest rate (as percent)		9.125%	9.125%
Natural Gas Litigation
Loss Contingencies [Line Items]
Number of cases	5				5
Natural Gas Litigation | Nevada
Loss Contingencies [Line Items]
Number of cases					4
Number of cases ended due to petition for writ of certiorari being denied	1
Natural Gas Litigation | Kansas
Loss Contingencies [Line Items]
Number of cases				1
Bankruptcy | Chapter Eleven Proceedings
Chapter Eleven Proceedings
GenOn Energy Holdings common stock shares reserved for unresolved claims (in shares) | shares		461
Number of reserved shares for disputed Chapter 11 claims converted into reserved of GenOn common stock (in shares) | shares		1,300
Number of reserved shares for disputed Chapter 11 claims converted into reserved of NRG common stock (in shares) | shares		159

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Regulatory Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Details) $ in Billions		9 Months Ended	12 Months Ended
	Aug. 01, 2016 USD ($)	Sep. 30, 2017 power_plant	Dec. 31, 2016 USD ($)
Regulated Operations [Abstract]
Regulatory payments sought			$ 2.5
Regulatory payments term			10 years
Public Utilities, General Disclosures [Line Items]
Out-of-market subsidy payments	$ 7.6
Out-of-market subsidy payment term	12 years
Illinois
Public Utilities, General Disclosures [Line Items]
Number of Exelon-owned nuclear power plants awarded ZECs | power_plant		2

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Environmental Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Details)		1 Months Ended
	Jul. 28, 2015 state	Apr. 30, 2017 petition
Site Contingency [Line Items]
Number of petitions granted by EPA to reconsider the rule | petition		2
Sulfur Dioxide Budgets
Site Contingency [Line Items]
Number of states required to revise budgets	4
Nitrogen Oxides Budget
Site Contingency [Line Items]
Number of states required to revise budgets	11

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Debtors' Financial Information (GenOn and GenOn Americas Generation) - Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Total operating revenues	$ 484	$ 532		$ 1,231	$ 1,509
Total operating costs and expenses	382	468		1,130	1,409
Operating (Loss)/Income	102	326		101	394
Other Expense
Total other expense	(1)	(42)		(100)	(126)
Income Before Reorganization Items and Income Taxes	101	284		1	268
Reorganization items, net	(29)	0		48	0
(Loss)/Income Before Income Taxes	72	284		49	268
Income tax expense	0	21		7	20
Net (Loss)/Income	72	$ 263		$ 42	$ 248
GenOn Energy, Inc. Debtors
Condensed Financial Statements, Captions [Line Items]
Total operating revenues	500		$ 594
Total operating costs and expenses	396		462
Operating (Loss)/Income	104		132
Other Expense
Total other expense	(3)		(4)
Income Before Reorganization Items and Income Taxes	101		128
Reorganization items, net	(29)		74
(Loss)/Income Before Income Taxes	72		202
Income tax expense	0		0
Net (Loss)/Income	72		202
GenOn Americas Generation Debtors
Condensed Financial Statements, Captions [Line Items]
Total operating revenues	446		511
Total operating costs and expenses	408		471
Operating (Loss)/Income	38		40
Other Expense
Total other expense	(5)		(6)
Income Before Reorganization Items and Income Taxes	33		34
Reorganization items, net	0		43
(Loss)/Income Before Income Taxes	33		77
Income tax expense	0		0
Net (Loss)/Income	$ 33		$ 77

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Debtors' Financial Information (GenOn and GenOn Americas Generation) - Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 810	$ 1,034
Restricted cash	1	0
Accounts receivable	124	109
Prepaid rent and other current assets	151	128
Total current assets	1,572	1,900
Property, plant and equipment, net	2,468	2,543
Other non-current assets	136	94
Total Assets	4,701	4,860
LIABILITIES AND STOCKHOLDER'S EQUITY
Accrued expenses and other current liabilities	128	191
Total current liabilities	270	1,191
Liabilities subject to compromise	2,862	0
Long-term debt	1	2,050
Other non-current liabilities	289	451
Total Liabilities	4,306	4,520
Stockholder's equity	395	340
Total Liabilities and Stockholder's Equity	4,701	4,860
Non-affiliated Entity
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	79	113
Long-term debt	1	2,050
Affiliated Entity
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	27	78
Long-term debt	125	$ 0
GenOn Energy, Inc. Debtors
ASSETS
Cash and cash equivalents	568
Restricted cash	1
Prepaid rent and other current assets	898
Total current assets	2,242
Property, plant and equipment, net	1,235
Investment in subsidiaries	(269)
Other non-current assets	144
Total Assets	3,896
LIABILITIES AND STOCKHOLDER'S EQUITY
Accrued expenses and other current liabilities	134
Total current liabilities	176
Liabilities subject to compromise	2,862
Other non-current liabilities	338
Total Liabilities	3,501
Stockholder's equity	395
Total Liabilities and Stockholder's Equity	3,896
GenOn Energy, Inc. Debtors | Non-affiliated Entity
ASSETS
Accounts receivable	117
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	42
GenOn Energy, Inc. Debtors | Affiliated Entity
ASSETS
Accounts receivable	658
Note receivable	0
Notes receivable	544
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	0
Long-term debt	125
GenOn Americas Generation Debtors
ASSETS
Cash and cash equivalents	0
Restricted cash	0
Prepaid rent and other current assets	274
Total current assets	702
Property, plant and equipment, net	155
Investment in subsidiaries	1,117
Other non-current assets	68
Total Assets	2,042
LIABILITIES AND STOCKHOLDER'S EQUITY
Accrued expenses and other current liabilities	93
Total current liabilities	139
Liabilities subject to compromise	721
Other non-current liabilities	81
Total Liabilities	941
Stockholder's equity	1,101
Total Liabilities and Stockholder's Equity	2,042
GenOn Americas Generation Debtors | Non-affiliated Entity
ASSETS
Accounts receivable	110
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	20
GenOn Americas Generation Debtors | Affiliated Entity
ASSETS
Accounts receivable	0
Note receivable	318
Notes receivable	0
LIABILITIES AND STOCKHOLDER'S EQUITY
Accounts payable	26
Long-term debt	$ 0

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Debtors' Financial Information (GenOn and GenOn Americas Generation) - Statement of Cash Flows (Details) - USD ($) $ in Millions	4 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities		$ (53)	$ 190
Net cash used by investing activities		(69)	326
Net cash used by financing activities		(101)	(4)
Net (Decrease)/Increase in Cash, Cash Equivalents and Funds Deposited by Counterparties		(223)	512
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at Beginning of Period		1,034	716
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at End of Period	$ 811	811	$ 1,228
GenOn Energy, Inc. Debtors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	97
Net cash used by investing activities	(9)
Net cash used by financing activities	(3)
Net (Decrease)/Increase in Cash, Cash Equivalents and Funds Deposited by Counterparties	85
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at Beginning of Period	484
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at End of Period	569	569
GenOn Americas Generation Debtors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	4
Net cash used by investing activities	(4)
Net cash used by financing activities	0
Net (Decrease)/Increase in Cash, Cash Equivalents and Funds Deposited by Counterparties	0
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at Beginning of Period	0
Cash, Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties at End of Period	$ 0	$ 0