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: June 30, 2014
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)

75-0655566 (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)
211 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, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

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

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 ENERGY, INC., GENON AMERICAS GENERATION, LLC AND GENON MID-ATLANTIC, LLC MEET 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).

TABLE OF CONTENTS

CAUTIONARY STATEMENT REGARDING FORWARD LOOKING INFORMATON		2
GLOSSARY OF TERMS		3
PART I — FINANCIAL INFORMATION		5
	Item 1 — CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND NOTES	5
	Item 2 — MANAGEMENT'S NARRATIVE ANALYSIS OF THE RESULTS OF OPERATIONS AND FINANCIAL CONDITION	33
	Item 3 —QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	49
	Item 4 — CONTROLS AND PROCEDURES	49
PART II — OTHER INFORMATION		50
	Item 1 — LEGAL PROCEEDINGS	50
	Item 1A — RISK FACTORS	50
	Item 2 — UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	50
	Item 3 — DEFAULTS UPON SENIOR SECURITIES	50
	Item 4 — MINE SAFETY DISCLOSURES	50
	Item 5 — OTHER INFORMATION	50
	Item 6 — EXHIBITS	51
	SIGNATURES	52

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 "believes," "projects," "anticipates," "plans," "expects," "intends," "estimates" 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, Item 1A of the Registrants' Annual Report on Form 10-K for the year ended December 31, 2013, including, but not limited to, the following:

• 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;

• The collateral demands of counterparties and other factors affecting the Registrants' liquidity position and financial condition;

• 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 and increased regulation of carbon dioxide and other greenhouse gas emissions;

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

• 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;

• 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;

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.

2

GLOSSARY OF TERMS

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

2013 Form 10-K	The Registrants' Annual Report on Form 10-K for the year ended December 31, 2013
Ancillary Services	Services that ensure reliability and support the transmission of electricity from generation sites to customer loads. Such services include regulation service, reserves and voltage support.
ASC	The FASB Accounting Standards Codification, which the FASB established as the source of authoritative U.S. GAAP
ASU	Accounting Standards Updates which reflect updates to the ASC
Bankruptcy Court	United States Bankruptcy Court for the Northern District of Texas, Fort Worth Division
CAIR	Clean Air Interstate Rule
Clean Water Act	Federal Water Pollution Control Act
CO2	Carbon dioxide
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
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 Energy Holdings	GenOn Energy Holdings, Inc. and, except where the context indicates otherwise, its subsidiaries
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 facilities under operating leases
ISO	Independent System Operator, also referred to as Regional Transmission Organization, or RTO
LIBOR	London Inter-Bank Offered Rate
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	Megawatt
MWh	Saleable megawatt hours net of internal/parasitic load megawatt-hours
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
NOL	Net Operating Loss
NOV	Notice of violation
NOx	Nitrogen oxide
NPDES	National pollutant discharge elimination system
NPNS	Normal Purchase Normal Sale
NRG	NRG Energy, Inc. and, except where the context indicates otherwise, its subsidiaries
NRG Americas	NRG Americas, Inc. (formerly known as GenOn Americas, Inc.)

3

NRG Merger	The merger completed on December 14, 2012, whereby GenOn became a wholly-owned subsidiary of NRG
NYISO	New York Independent System Operator
NYSPSC	New York State Public Service Commission
OCI	Other comprehensive income
PADEP	Pennsylvania Department of Environmental Protection
PJM	PJM Interconnection, LLC
PJM market	The wholesale and retail electric market operated by PJM primarily in all or parts of Delaware, the District of Columbia, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia and West Virginia
Registrants	GenOn, GenOn Americas Generation and GenOn Mid-Atlantic, collectively
Securities Act	The Securities Act of 1933, as amended
SO2	Sulfur dioxide
U.S.	United States of America
U.S. GAAP	Accounting principles generally accepted in the United States

4

PART I - FINANCIAL INFORMATION

ITEM 1 - CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND NOTES

GENON ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended June 30,						Six months ended June 30,
	2014			2013			2014			2013
	(In millions)
Operating Revenues
Operating revenues	$	561		$	716		$	1,587		$	1,140
Operating revenues — affiliate	(3		)	9			21			15
Total operating revenues	558			725			1,608			1,155
Operating Costs and Expenses
Cost of operations	381			285			1,003			635
Cost of operations — affiliate	36			170			291			310
Depreciation and amortization	58			71			120			137
Selling, general and administrative	23			21			41			54
Selling, general and administrative — affiliate	33			19			66			36
Acquisition-related transaction and integration costs	1			22			2			41
Total operating costs and expenses	532			588			1,523			1,213
Loss on sale of assets	—			—			(6		)	—
Operating Income/(Loss)	26			137			79			(58		)
Other Expense
Other income, net	1			—			2			2
Interest expense	(47		)	(53		)	(94		)	(97		)
Interest expense - affiliate	(4		)	(3		)	(7		)	(6		)
Loss on debt extinguishment	—			(11		)	—			(11		)
Total other expense	(50		)	(67		)	(99		)	(112		)
(Loss)/Income Before Income Taxes	(24		)	70			(20		)	(170		)
Income tax expense/(benefit)	1			(6		)	2			(6		)
Net (Loss)/Income	$	(25	)	$	76		$	(22	)	$	(164	)

See accompanying notes to condensed consolidated financial statements.

5

GENON ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME

(Unaudited)

	Three months ended June 30,					Six months ended June 30,
	2014			2013		2014			2013
	(In millions)
Net (Loss)/Income	$	(25	)	$	76	$	(22	)	$	(164	)
Other comprehensive income net of reclassifications, net of tax of $0:
Unrealized gain on derivatives	—			16		—			17
Defined benefit plans	8			29		8			30
Other comprehensive income	8			45		8			47
Comprehensive (Loss)/Income	$	(17	)	$	121	$	(14	)	$	(117	)

See accompanying notes to condensed consolidated financial statements.

6

GENON ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

	June 30, 2014			December 31, 2013
	(unaudited)
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	708		$	760
Funds deposited by counterparties	—			56
Accounts receivable — trade	121			178
Inventory	409			443
Derivative instruments	586			464
Derivative instruments — affiliate	8			5
Cash collateral paid in support of energy risk management activities	223			62
Prepayments and other current assets	202			194
Total current assets	2,257			2,162
Property, plant and equipment, net of accumulated depreciation of $365 and $248	3,121			3,176
Other Assets
Intangible assets, net of accumulated amortization of $54 and $34	68			65
Derivative instruments	170			181
Derivative instruments — affiliate	2			1
Other non-current assets	208			149
Total other assets	448			396
Total Assets	$	5,826		$	5,734
LIABILITIES AND STOCKHOLDER'S EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	7		$	5
Accounts payable	146			187
Accounts payable — affiliate	5			72
Derivative instruments	532			160
Derivative instruments — affiliate	15			3
Cash collateral received in support of energy risk management activities	—			56
Accrued expenses and other current liabilities	219			266
Total current liabilities	924			749
Other Liabilities
Long-term debt and capital leases	3,135			3,128
Derivative instruments	75			18
Derivative instruments — affiliate	1			—
Out-of-market contracts	1,008			1,045
Other non-current liabilities	382			481
Total non-current liabilities	4,601			4,672
Total Liabilities	5,525			5,421
Commitments and Contingencies
Stockholder's Equity
Common stock: $0.001 par value, 1 share authorized and issued at June 30, 2014 and December 31, 2013	—			—
Additional paid-in capital	325			325
Accumulated deficit	(134		)	(114		)
Accumulated other comprehensive income	110			102
Total Stockholder's Equity	301			313
Total Liabilities and Stockholder's Equity	$	5,826		$	5,734

See accompanying notes to condensed consolidated financial statements.

7

GENON ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Six months ended June 30,
	2014			2013
	(In millions)
Cash Flows from Operating Activities
Net loss	$	(22	)	$	(164	)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	120			137
Amortization of financing costs and debt discount/premiums	(29		)	(43		)
Amortization of out-of-market contracts and emission allowances	(17		)	(36		)
Amortization of unearned equity compensation	—			7
Adjustment to loss on debt extinguishment	—			(28		)
Loss on sale of asset	6			1
Changes in derivative instruments	327			159
Changes in collateral deposits supporting energy risk management activities	(161		)	99
Changes in other working capital	(234		)	(22		)
Net Cash Provided by Operating Activities	(10		)	110
Cash Flows from Investing Activities
Capital expenditures	(97		)	(190		)
Decrease in restricted cash, net	—			(16		)
Purchase of emission allowances, net of proceeds	—			(14		)
Proceeds from sale of assets, net of cash disposed of	50			1
Other	5			—
Net Cash Used by Investing Activities	(42		)	(219		)
Cash Flows from Financing Activities
Proceeds from issuance of long-term debt	—			110
Payments for short and long-term debt	—			(578		)
Net Cash Used by Financing Activities	—			(468		)
Net Decrease in Cash and Cash Equivalents	(52		)	(577		)
Cash and Cash Equivalents at Beginning of Period	760			825
Cash and Cash Equivalents at End of Period	$	708		$	248

See accompanying notes to condensed consolidated financial statements.

8

GENON AMERICAS GENERATION, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended June 30,						Six months ended June 30,
	2014			2013			2014			2013
	(In millions)
Operating Revenues
Operating revenues	$	499		$	666		$	1,456		$	1,065
Operating revenues — affiliate	27			(28		)	135			105
Total operating revenues	526			638			1,591			1,170
Operating Costs and Expenses
Cost of operations	184			160			555			379
Cost of operations — affiliate	284			376			846			704
Depreciation and amortization	27			26			49			53
Selling, general and administrative	3			1			5			2
Selling, general and administrative — affiliate	24			22			42			42
Total operating costs and expenses	522			585			1,497			1,180
Loss on sale of assets	—			—			(6		)	—
Operating Income/(Loss)	4			53			88			(10		)
Other Expense
Interest expense	(16		)	(17		)	(33		)	(33		)
Interest expense — affiliate	(2		)	(1		)	(4		)	(3		)
Total other expense	(18		)	(18		)	(37		)	(36		)
(Loss)/Income Before Income Taxes	(14		)	35			51			(46		)
Income tax	—			—			—			—
Net (Loss)/Income	$	(14	)	$	35		$	51		$	(46	)

See accompanying notes to condensed consolidated financial statements.

9

GENON AMERICAS GENERATION, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

	June 30, 2014		December 31, 2013
	(unaudited)
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	34	$	63
Accounts receivable — trade	103		151
Note receivable — affiliate	189		299
Inventory	229		270
Derivative instruments	586		462
Derivative instruments — affiliate	409		84
Cash collateral paid in support of energy risk management activities	212		50
Prepayments and other current assets	150		105
Total current assets	1,912		1,484
Property, plant and equipment, net of accumulated depreciation of $141 and $96	1,107		1,194
Other Assets
Intangible assets, net of accumulated amortization of $53 and $34	68		64
Derivative instruments	170		181
Derivative instruments — affiliate	62		8
Other non-current assets	103		32
Total other assets	403		285
Total Assets	$	3,422	$	2,963
LIABILITIES AND MEMBER'S EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	5	$	5
Accounts payable	52		90
Accounts payable — affiliate	120		86
Derivative instruments	532		160
Derivative instruments — affiliate	358		107
Cash collateral received in support of energy risk management activities	—		56
Accrued expenses and other current liabilities	99		93
Total current liabilities	1,166		597
Other Liabilities
Long-term debt and capital leases	935		943
Derivative instruments	75		18
Derivative instruments — affiliate	59		23
Out-of-market contracts	561		575
Other non-current liabilities	103		116
Total non-current liabilities	1,733		1,675
Total Liabilities	2,899		2,272
Commitments and Contingencies
Member’s Equity
Member’s interest	523		691
Total Member’s Equity	523		691
Total Liabilities and Member’s Equity	$	3,422	$	2,963

See accompanying notes to condensed consolidated financial statements.

10

GENON AMERICAS GENERATION, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Six months ended June 30,
	2014			2013
	(In millions)
Cash Flows from Operating Activities
Net income/(loss)	$	51		$	(46	)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	49			53
Amortization of debt premiums	(4		)	(4		)
Amortization of out-of-market contracts and emission allowances	(3		)	(12		)
Loss on disposals and sales of assets	6			4
Changes in derivative instruments	224			122
Changes in collateral deposits supporting energy risk management activities	(218		)	48
Changes in other working capital	43			(51		)
Net Cash Provided by Operating Activities	148			114
Cash Flows from Investing Activities
Capital expenditures	(17		)	(35		)
Decrease in note receivable — affiliate	110			(103		)
Purchase of emission allowances, net of proceeds	—			(14		)
Proceeds from sale of assets, net of cash disposed of	50			—
Net Cash Provided/(Used) by Investing Activities	143			(152		)
Cash Flows from Financing Activities
Payments for short and long-term debt	—			(2		)
Capital contributions	—			37
Distributions to member	(320		)	(70		)
Net Cash Used by Financing Activities	(320		)	(35		)
Net Decrease in Cash and Cash Equivalents	(29		)	(73		)
Cash and Cash Equivalents at Beginning of Period	63			148
Cash and Cash Equivalents at End of Period	$	34		$	75

See accompanying notes to condensed consolidated financial statements.

11

GENON MID-ATLANTIC, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended June 30,						Six months ended June 30,
	2014			2013			2014			2013
	(In millions)
Operating Revenues
Operating revenues	$	(5	)	$	46		$	(156	)	$	6
Operating revenues — affiliate	201			197			679			335
Total operating revenues	196			243			523			341
Operating Costs and Expenses
Cost of operations	160			57			394			108
Cost of operations — affiliate	(14		)	90			1			177
Depreciation and amortization	24			19			43			38
Selling, general and administrative — affiliate	20			17			35			33
Total operating costs and expenses	190			183			473			356
Operating Income/(Loss)	6			60			50			(15		)
Other Expense
Interest expense	(1		)	—			(1		)	—
Interest expense — affiliate	(1		)	(1		)	(2		)	(2		)
Total other expense	(2		)	(1		)	(3		)	(2		)
Income/(Loss) Before Income Taxes	4			59			47			(17		)
Income tax	—			—			—			—
Net Income/(Loss)	$	4		$	59		$	47		$	(17	)

See accompanying notes to condensed consolidated financial statements.

12

GENON MID-ATLANTIC, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

	June 30, 2014		December 31, 2013
	(unaudited)
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	35	$	64
Accounts receivable — trade	2		4
Accounts receivable — affiliate	3		35
Inventory	129		158
Derivative instruments	165		298
Derivative instruments — affiliate	74		53
Prepayments and other current assets	71		81
Total current assets	479		693
Property, plant and equipment, net of accumulated depreciation of $119 and $77	950		987
Other Assets
Intangible assets, net of accumulated amortization of $1 and $0	10		11
Derivative instruments	30		60
Derivative instruments — affiliate	83		96
Other non-current assets	95		25
Total other assets	218		192
Total Assets	$	1,647	$	1,872
LIABILITIES AND MEMBER'S EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	5	$	5
Accounts payable	15		16
Derivative instruments	22		—
Derivative instruments — affiliate	108		64
Accrued expenses and other current liabilities	55		49
Total current liabilities	205		134
Other Liabilities
Long-term debt and capital leases	2		5
Derivative instruments — affiliate	16		9
Out-of-market contracts	560		575
Other non-current liabilities	58		71
Total non-current liabilities	636		660
Total Liabilities	841		794
Commitments and Contingencies
Member’s Equity
Member’s interest	806		1,078
Total Member’s Equity	806		1,078
Total Liabilities and Member’s Equity	$	1,647	$	1,872

See accompanying notes to condensed consolidated financial statements.

13

GENON MID-ATLANTIC, LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Six months ended June 30,
	2014			2013
	(In millions)
Cash Flows from Operating Activities
Net income/(loss)	$	47		$	(17	)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	43			38
Amortization of out-of-market contracts and emission allowances	(6		)	(12		)
Loss on disposals and sales of assets	—			4
Changes in derivative instruments	228			121
Changes in collateral deposits supporting energy risk management activities	—			18
Changes in other working capital	(12		)	(112		)
Net Cash Provided by Operating Activities	300			40
Cash Flows from Investing Activities
Capital expenditures	(9		)	(30		)
Net Cash Used by Investing Activities	(9		)	(30		)
Cash Flows from Financing Activities
Payments for short and long-term debt	—			(2		)
Issuance of notes payable - affiliate	—			2
Distributions to member	(320		)	(70		)
Net Cash Used by Financing Activities	(320		)	(70		)
Net Decrease in Cash and Cash Equivalents	(29		)	(60		)
Cash and Cash Equivalents at Beginning of Period	64			135
Cash and Cash Equivalents at End of Period	$	35		$	75

See accompanying notes to condensed consolidated financial statements.

14

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 approximately 19,583 MW of net electric generating capacity located in the U.S.

GenOn Americas Generation is a wholesale power generator with approximately 7,596 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 19,583 MW of net electric generating capacity of GenOn.

GenOn Mid-Atlantic operates and owns or leases 4,683 MW of net electric generating capacity in Maryland near Washington, D.C. GenOn Mid-Atlantic’s electric generating capacity is part of the 7,596 MW of net electric generating capacity of GenOn Americas Generation. GenOn Mid-Atlantic’s generating facilities 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 a wholly-owned subsidiary of NRG North America and 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.

On December 14, 2012, NRG completed the acquisition of GenOn, referred to herein as the NRG Merger.

This is a combined quarterly report of the Registrants for the quarter ended June 30, 2014. 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 U.S. GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the Registrants' financial statements set forth in the 2013 Form 10-K. Interim results are not necessarily indicative of results for a full year.

In the opinion of management, the accompanying unaudited interim 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 June 30, 2014, the results of operations, comprehensive income/(loss) and cash flows for the three months and six months ended June 30, 2014 and 2013.

Use of Estimates

The preparation of financial statements in conformity with U.S. 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. Certain prior period depreciation amounts have been recast to revise provisional purchase accounting estimates for the NRG Merger.

Reclassifications

Certain prior-year amounts have been reclassified for comparative purposes.  The reclassification did not affect results from operations. 

15

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

Recent Accounting Developments

ASU 2014-09 - In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU No. 2014-09. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Registrants are currently evaluating the impact of the standard on the Registrants' results of operations, cash flows and financial position.

ASU 2013-11 - In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740) Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, or ASU No. 2013-11.  The amendments of ASU No. 2013-11, which were adopted on January 1, 2014, require an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction of a deferred tax asset for a net operating loss, or NOL, a similar tax loss or tax credit carryforward rather than a liability when the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and the entity intends to use the deferred tax asset for that purpose. The adoption of this standard did not impact the Registrants' results of operations or cash flows.

Note 3 — 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' 2013 Form 10-K.

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

The estimated carrying amounts and fair values of GenOn and GenOn Americas Generation’s debt are as follows:

GenOn

	As of June 30, 2014				As of December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Long and short-term debt	$	3,132	$	3,015	$	3,120	$	3,058

The fair value of long and short-term debt that is estimated using reported market prices for instruments that are publicly traded is classified as Level 2 within the fair value hierarchy.

GenOn Americas Generation

	As of June 30, 2014				As of December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Long and short-term debt	$	933	$	874	$	938	$	883

The fair value of long and short-term debt is estimated using reported market prices for instruments that are publicly traded and is classified as Level 2 within the fair value hierarchy.

16

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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	108	$	646	$	12	$	766
Derivative liabilities:
Commodity contracts	$	19	$	548	$	56	$	623
Other assets (b)	$	21	$	—	$	—	$	21

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

(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, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	141	$	507	$	3	$	651
Derivative liabilities:
Commodity contracts	$	25	$	149	$	7	$	181
Other assets (b)	$	37	$	—	$	—	$	37

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

(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 tables reconcile, for the three and six months ended June 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	(2	)	$	(6	)	$	(4	)	$	17
Total (losses)/gains included in earnings — realized/unrealized	(2		)	4			2			1
Purchases	(41		)	6			(41		)	2
Settlements	—			(1		)	—			(17		)
Transfers into Level 3 (b)	1			—			(1		)	—
Ending balance	$	(44	)	$	3		$	(44	)	$	3
(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 June 30	$	(1	)	$	14		$	(1	)	$	1

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

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

17

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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	117	$	1,088	$	22	$	1,227
Derivative liabilities:
Commodity contracts	$	51	$	910	$	63	$	1,024

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

	As of December 31, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	153	$	575	$	7	$	735
Derivative liabilities:
Commodity contracts	$	74	$	226	$	8	$	308

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

The following tables reconcile, for the three and six months ended June 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	(6	)	$	(1	)	$	17
Total (losses)/gains included in earnings — realized/unrealized	(2		)	3			—			(16		)
Purchases	(40		)	6			(40		)	2
Transfers into Level 3 (b)	1			—			—
Ending balance	$	(41	)	$	3		$	(41	)	$	3
(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 June 30	$	(1	)	$	14		$	(1	)	$	1

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

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

18

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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	74	$	276	$	2	$	352
Derivative liabilities:
Commodity contracts	$	9	$	94	$	43	$	146

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

	As of December 31, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	87	$	420	$	—	$	507
Derivative liabilities:
Commodity contracts	$	13	$	60	$	—	$	73

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

The following tables reconcile, for the three and six months endedJune 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	(6	)	$	—		$	7
Total (losses)/gains included in earnings — realized/unrealized	(1		)	2			(1		)	(7		)
Purchases	(40		)	6			(40		)	2
Ending balance	$	(41	)	$	2		$	(41	)	$	2
(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 June 30	$	(1	)	$	8		$	(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 June 30, 2014, contracts valued with prices provided by models and other valuation techniques make up 2% of GenOn's derivative assets and 9% of GenOn's derivative liabilities, 2% of GenOn Americas Generation’s derivative assets and 6% of GenOn Americas Generation's derivative liabilities and 1% of GenOn Mid-Atlantic’s derivative assets and 29% of GenOn Mid-Atlantic's derivative liabilities.

19

The fair value of each contract is discounted using a risk free interest rate. In addition, the Registrants apply a credit reserve to reflect credit risk which is calculated based on published default probabilities. The Registrants' credit reserves were as follows:

	As of June 30, 2014		As of December 31, 2013
	(In millions)
GenOn	$	1	$	1
GenOn Americas Generation	1		1
GenOn Mid-Atlantic	1		3

Concentration of Credit Risk

In addition to the credit risk discussion as disclosed in Note 2, Summary of Significant Accounting Policies, to the Registrants' 2013 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 2013 Form 10-K. As of June 30, 2014, GenOn's counterparty credit exposure was $338 million and GenOn held collateral (cash and letters of credit) against those positions of $1 million, resulting in a net exposure of $338 million. Approximately 86% of GenOn's exposure before collateral is expected to roll off by the end of 2015. As of June 30, 2014, GenOn Americas Generation’s counterparty credit exposure was $338 million and GenOn Americas Generation held collateral (cash and letters of credit) against those positions of $1 million, resulting in a net exposure of $338 million. Approximately 86% of GenOn Americas Generation’s exposure before collateral is expected to roll off by the end of 2015. As of June 30, 2014, GenOn Mid-Atlantic’s counterparty credit exposure was $174 million and GenOn Mid-Atlantic held no collateral (cash and letters or credit) against those positions, resulting in a net exposure of $174 million. Approximately 100% of GenOn Mid-Atlantic’s exposure before collateral is expected to roll off by the end of 2015. 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.

GenOn

Category	Net Exposure (a) (% of Total)
Financial institutions	53	%
Utilities, energy merchants, marketers and other	20
ISOs	24
Coal	3
Total as of June 30, 2014	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	98	%
Non-rated	2
Total as of June 30, 2014	100	%

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

GenOn has counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of the total net exposure discussed above. The aggregate of such counterparties' exposure was $280 million. 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, GenOn does not anticipate a material impact on its financial position or results of operations from nonperformance by any of its counterparties.

20

GenOn Americas Generation

Category	Net Exposure (a) (% of Total)
Financial institutions	53	%
Utilities, energy merchants, marketers and other	20
ISOs	24
Coal	3
Total as of June 30, 2014	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	98	%
Non-rated	2
Total as of June 30, 2014	100	%

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

GenOn Americas Generation has counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of the total net exposure discussed above. The aggregate of such counterparties' exposure was $280 million. 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, GenOn Americas Generation does not anticipate a material impact on its financial position or results of operations from nonperformance by any of its counterparties.

GenOn Mid-Atlantic

Category	Net Exposure (a) (% of Total)
Financial institutions	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	100	%

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

GenOn Mid-Atlantic has counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of the total net exposure discussed above. The aggregate of such counterparties' exposure was $163 million. 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, GenOn Mid-Atlantic does not anticipate a material impact on its financial position or results of operations from nonperformance by any of its counterparties.

21

Note 4 — 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' 2013 Form 10-K.

Energy-Related Commodities(GenOn)

As of June 30, 2014, GenOn had energy-related derivative financial instruments extending through 2017.

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 June 30, 2014 and December 31, 2013. 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 June 30, 2014		As of December 31, 2013	As of June 30, 2014		As of December 31, 2013	As of June 30, 2014		As of December 31, 2013
Commodity	Units	(In millions)
Coal	Short Ton	11		6	9		4	9		4
Natural Gas	MMBtu	(83	)	(111)	(89	)	(113)	(94	)	(119)
Power	MWh	(36	)	(26)	(18	)	(14)	(17	)	(14)

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
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	594	$	469	$	547	$	163
Commodity contracts long-term	172		182		76		18
Total Derivatives Not Designated as Cash Flow Hedges	$	766	$	651	$	623	$	181

GenOn Americas Generation

	Fair Value
	Derivative Assets				Derivative Liabilities
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	995	$	546	$	890	$	267
Commodity contracts long-term	232		189		134		41
Total Derivatives Not Designated as Cash Flow Hedges	$	1,227	$	735	$	1,024	$	308

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GenOn Mid-Atlantic

	Fair Value
	Derivative Assets				Derivative Liabilities
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	239	$	351	$	130	$	64
Commodity contracts long-term	113		156		16		9
Total Derivatives Not Designated as Cash Flow Hedges	$	352	$	507	$	146	$	73

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	756		$	(557	)	$	—	$	199
Derivative assets - affiliate	10			(10		)	—		—
Derivative liabilities	(607		)	557			40		(10		)
Derivative liabilities - affiliate	(16		)	10			—		(6		)
Total derivative instruments	$	143		$	—		$	40	$	183

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	756		$	(557	)	$	—	$	199
Derivative assets - affiliate	471			(417		)	—		54
Derivative liabilities	(607		)	557			40		(10		)
Derivative liabilities - affiliate	(417		)	417			—		—
Total derivative instruments	$	203		$	—		$	40	$	243

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	195		$	(20	)	$	—	$	175
Derivative assets - affiliate	157			(124		)	—		33
Derivative liabilities	(22		)	20			—		(2		)
Derivative liabilities - affiliate	(124		)	124			—		—
Total derivative instruments	$	206		$	—		$	—	$	206

23

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	645		$	(154	)	$	(56	)	$	435
Derivative assets - affiliate	6			(3		)	—			3
Derivative liabilities	(178		)	154			—			(24		)
Derivative liabilities - affiliate	(3		)	3			—			—
Total derivative instruments	$	470		$	—		$	(56	)	$	414

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	643		$	(154	)	$	(56	)	$	433
Derivative assets - affiliate	92			(92		)	—			—
Derivative liabilities	(178		)	154			—			(24		)
Derivative liabilities - affiliate	(130		)	92			—			(38		)
Total derivative instruments	$	427		$	—		$	(56	)	$	371

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	358		$	—		$	—	$	358
Derivative assets - affiliate	149			(73		)	—		76
Derivative liabilities	—			—			—		—
Derivative liabilities - affiliate	(73		)	73			—		—
Total derivative instruments	$	434		$	—		$	—	$	434

Accumulated Other Comprehensive Income (GenOn)

The following table summarizes the effects on GenOn's accumulated OCI balance attributable to cash flow hedge derivatives:

	Three months ended June 30,					Six months ended June 30,
(In millions)	2014		2013			2014		2013
Accumulated OCI balance, beginning of period	$	—	$	2		$	—	$	1
Recognized in OCI on interest rate derivatives	—		17			—		19
Reclassified from accumulated OCI into earnings(a)(b)	—		(1		)	—		(2		)
Accumulated OCI balance, end of period	$	—	$	18		$	—	$	18

(a) Amounts reclassified from accumulated OCI into income and amounts recognized in income from the ineffective portion of cash flow hedges are recorded in interest expense.

(b) All of the forecasted transactions (future interest payments) were deemed probable of occurring; therefore, no cash flow hedges were discontinued and no amount was recognized in GenOn’s results of operations as a result of discontinued cash flow hedges.

24

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 not accounted for as cash flow hedges are reflected in current period earnings.

The following tables summarize the pre-tax effects of economic hedges that have not been designated as cash flow hedges and trading activity on the Registrants’ statements of operations. These amounts are included within operating revenues and cost of operations.

GenOn

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(91	)	$	(99	)	$	(151	)	$	(197	)
Net unrealized gains/(losses) on open positions related to economic hedges	2			161			(169		)	38
Total unrealized mark-to-market (losses)/gains for economic hedging activities	(89		)	62			(320		)	(159		)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity	—			1			(1		)	(2		)
Net unrealized gains on open positions related to trading activity	—			—			—			2
Total unrealized mark-to-market gains/(losses) for trading activity	—			1			(1		)	—
Total unrealized (losses)/gains	$	(89	)	$	63		$	(321	)	$	(159	)

	Three months ended June 30,					Six months ended June 30,
(In millions)	2014			2013		2014			2013
Revenue from operations — energy commodities	$	(119	)	$	45	$	(344	)	$	(190	)
Cost of operations	30			18		23			31
Total impact to statements of operations	$	(89	)	$	63	$	(321	)	$	(159	)

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GenOn Americas Generation

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(79	)	$	(75	)	$	(136	)	$	(149	)
Net unrealized gains/(losses) on open positions related to economic hedges	8			86			(85		)	26
Total unrealized mark-to-market (losses)/gains for economic hedging activities	(71		)	11			(221		)	(123		)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity	—			1			(1		)	(2		)
Net unrealized gains on open positions related to trading activity	—			—			—			2
Total unrealized mark-to-market gains/(losses) for trading activity	—			1			(1		)	—
Total unrealized (losses)/gains	$	(71	)	$	12		$	(222	)	$	(123	)

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Revenue from operations — energy commodities	$	(94	)	$	(2	)	$	(239	)	$	(153	)
Cost of operations	23			14			17			30
Total impact to statements of operations	$	(71	)	$	12		$	(222	)	$	(123	)

GenOn Mid-Atlantic

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(77	)	$	(76	)	$	(140	)	$	(150	)
Net unrealized gains/(losses) on open positions related to economic hedges	7			86			(85		)	28
Total unrealized (losses)/gains	$	(70	)	$	10		$	(225	)	$	(122	)

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Revenue from operations — energy commodities	$	(93	)	$	(4	)	$	(243	)	$	(152	)
Cost of operations	23			14			18			30
Total impact to statements of operations	$	(70	)	$	10		$	(225	)	$	(122	)

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 June 30, 2014 was $18 million for GenOn and GenOn Americas Generation. The collateral required for contracts with credit rating contingent features that are in a net liability position as of June 30, 2014, was $2 million for GenOn and GenOn Americas Generation. In addition, GenOn and GenOn Americas Generation are parties to certain marginable agreements under which they have net liability positions, but the counterparties have not called for collateral due, which is approximately $3 million for GenOn and GenOn Americas Generation as of June 30, 2014. As of June 30, 2014, GenOn Mid-Atlantic is party to certain marginable agreements under which they have net liability positions, but the counterparties have not called for collateral due, which is approximately $2 million for GenOn Mid-Atlantic.

See Note 3, Fair Value of Financial Instruments, for discussion regarding concentration of credit risk.

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Note 5 —  Income Taxes (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

GenOn

GenOn’s income tax expense/(benefit) consisted of the following:

	Three months ended June 30,						Six months ended June 30,
(In millions except otherwise noted)	2014			2013			2014			2013
(Loss)/income before income taxes	$	(24	)	$	70		$	(20	)	$	(170	)
Income tax expense/(benefit)	1			(6		)	2			(6		)
Effective tax rate	(4.2		)%	(8.6		)%	(10.0		)%	3.5		%

GenOn

For the three and six months ended June 30, 2014, GenOn's overall effective tax rate was lower than the statutory rate of 35% primarily due to a change in the valuation allowance and the impact of state income taxes. For the three and six months ended June 30, 2013, GenOn's overall effective tax rate was lower than the statutory rate of 35% primarily due to a change in the valuation allowance. Through June 30, 2014, GenOn recorded income tax expense relating to state income tax payments.

GenOn Americas Generation

GenOn Americas Generation's allocated income taxes resulting from its operations for the three and six months ended June 30,2014 and 2013 were $0 as the income tax expense relates to state income tax payments attributable to its parent, GenOn. GenOn Americas Generation's pro forma income taxes resulting from its operations for the three and six months ended June 30,2014 and 2013 are $0 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 are $0 for the three and six months ended June 30,2014 and 2013 as the income tax expense relates to state income tax payments attributable to its parent, GenOn. The pro forma income tax provision attributable to income before taxes is a tax expense of $2 million and tax expense of $23 million during the three months ended June 30, 2014 and 2013, respectively. The pro forma income tax provision attributable to income before taxes is a tax expense of $17 million during the six months ended June 30, 2014. The pro forma income tax provision attributable to losses before taxes is a tax benefit of $4 million during the six months ended June 30, 2013. The balance of GenOn Mid-Atlantic's pro forma deferred income taxes is a net deferred tax asset of $125 million and $141 million as of June 30, 2014 and December 31, 2013, respectively.    

Note 6 — 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 its 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 is 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 are approximately $193 million. NRG charges these fees on a monthly basis, less amounts incurred directly by GenOn. Management has concluded that this method of charging overhead costs is reasonable. For the three and six months endedJune 30, 2014, GenOn recorded costs related to these services of $33 million and $66 million, respectively, as selling, general and administrative — affiliate. For the three and six months endedJune 30, 2013, GenOn recorded costs related to these services of $19 million and $36 million, respectively, as selling, general and administrative — affiliate.

Under the Service 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.

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The following costs were incurred under these arrangements:

GenOn Americas Generation

	Three months ended June 30,					Six months ended June 30,
	2014			2013		2014		2013
	(In millions)
Allocated costs:
Cost of operations — affiliate	$	(1	)	$	1	$	1	$	5
Selling, general and administrative — affiliate	24			22		42		42
Total	$	23		$	23	$	43	$	47

GenOn Mid-Atlantic

	Three months ended June 30,					Six months ended June 30,
	2014			2013		2014		2013
	(In millions)
Allocated costs:
Cost of operations — affiliate	$	(1	)	$	—	$	—	$	3
Selling, general and administrative — affiliate	20			17		35		33
Total	$	19		$	17	$	35	$	36

Credit Agreement with NRG (GenOn)

In connection with the closing of the NRG Merger, GenOn and GenOn Americas entered into a secured intercompany revolving credit agreement with NRG.  This credit agreement provides for a $500 million revolving credit facility, all of which is available for revolving loans and letters of credit. At June 30, 2014 and December 31, 2013, $281 million and $349 million of letters of credit were issued and outstanding under the NRG credit agreement, of which $217 million and $258 million were issued on behalf of GenOn Americas Generation. At June 30, 2014 and December 31, 2013, no loans were outstanding under this credit agreement.  In connection with the executio0n of the agreement, 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 credit agreement has a three year maturity and is payable at maturity, subject to certain exceptions primarily related to asset sales not in the ordinary course of business and borrowings of debt. In addition, the guarantors are restricted from incurring additional liens on their assets. At GenOn's election, the interest rate per year applicable to the loans under the credit agreement will be determined by reference to either (i) the base rate plus 2.50% per year or (ii) the LIBOR rate plus 3.50% per year. In addition, the credit agreement contains customary covenants and events of default.

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 or notes payable — affiliate, as appropriate. The notes are due on demand and accrue interest on the net position, which is payable quarterly, at a rate determined by GenOn Energy Holdings, a wholly-owned subsidiary of GenOn. At June 30, 2014 and December 31, 2013, GenOn Americas Generation had a net current note receivable from GenOn Energy Holdings of $189 million and $299 million, respectively, related to its intercompany cash management program. For the six months endedJune 30, 2014 and 2013, GenOn Americas Generation earned an insignificant amount of net interest income related to these notes.

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

In May 2014, GenOn Mid-Atlantic made a distribution of $320 million to its parent, NRG North America LLC, who in turn made a distribution of $320 million to its parent, GenOn Americas Generation. GenOn Americas Generation subsequently made a distribution to GenOn in the same amount, through its parent companies NRG Americas, Inc. and GenOn Energy Holdings, Inc.

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Note 7 — Commitments and Contingencies (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 18, Commitments and Contingencies, to the Registrants' 2013 Form 10-K.

Contingencies

Set forth below is a description of the Registrants’ material legal proceedings. 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. 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 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.

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.  In March 2012, the Court of Appeals reversed the District Court's dismissal and reinstated MC Asset Recovery's amended complaint against the Commerzbank Defendants.  If MC Asset Recovery succeeds in obtaining any recoveries from the Commerzbank Defendants, the Commerzbank Defendants have asserted that they will seek to file claims in Mirant's bankruptcy proceedings for the amount of those recoveries.  GenOn Energy Holdings would vigorously contest the allowance of any such claims. If the Commerzbank Defendants were to receive an allowed claim as a result of a recovery by MC Asset Recovery on its claims against them, GenOn Energy Holdings would retain from the net amount recovered by MC Asset Recovery an amount equal to the dollar amount of the resulting allowed claim.

Pending 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 antitrust 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 is 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. The Court of Appeals reversed the decision of the District Court. On August 26, 2013, 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 Court of Appeal's decision. On July 1, 2014, the U.S. Supreme Court granted the petition for a writ of certiorari.

In September 2012, the State of Nevada Supreme Court, which is 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. GenOn has agreed to indemnify CenterPoint against certain losses relating to these lawsuits.

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Cheswick Class Action Complaint (GenOn)

In April 2012, a putative class action lawsuit was filed against GenOn in the Court of Common Pleas of Allegheny County, Pennsylvania alleging that emissions from the Cheswick generating facility have damaged the property of neighboring residents.  GenOn disputes these allegations.  Plaintiffs have brought nuisance, negligence, trespass and strict liability claims seeking both damages and injunctive relief.  Plaintiffs seek to certify a class that consists of people who own property or live within one mile of the plant. In July 2012, GenOn removed the lawsuit to the U.S. District Court for the Western District of Pennsylvania. In October 2012, the court granted GenOn’s motion to dismiss, which Plaintiffs appealed to the U.S. Court of Appeals for the Third Circuit. On August 20, 2013, the Court of Appeals reversed the decision of the District Court. On September 3, 2013, GenOn filed a petition for rehearing with the Court of Appeals which was subsequently denied. In February 2014, NRG filed a petition for a writ of certiorari to the U.S. Supreme Court seeking review and reversal of the Court of Appeals decision. On June 2, 2014, the U.S. Supreme Court denied the petition for a writ of certiorari. The case is proceeding in the U.S. District Court for the Western District of Pennsylvania.

Cheswick Monarch Mine NOV(GenOn)

In 2008, the PADEP issued an NOV related to the Monarch mine located near the Cheswick generating facility. It has not been mined for many years. GenOn uses the Monarch mine for disposal of low-volume wastewater from the Cheswick generating facility and for disposal of leachate collected from ash disposal facilities. The NOV addresses the alleged requirement to maintain a minimum pumping volume from the mine. The PADEP indicated it will seek a civil penalty of approximately $200,000. GenOn contests the allegations in the NOV and has not agreed to such penalty. GenOn is currently planning capital expenditures in connection with wastewater from Cheswick and leachate from ash disposal facilities.

Maryland Department of the Environment v. GenOn Chalk Point and GenOn Mid-Atlantic

On January 25, 2013, Food & Water Watch, the Patuxent Riverkeeper and the Potomac Riverkeeper (together, the Citizens Group) sent GenOn Mid-Atlantic a letter alleging that the Chalk Point, Dickerson and Morgantown generating facilities were violating the terms of the National Pollution Discharge Elimination System permits by discharging nitrogen and phosphorous in excess of the limits in each permit. On March 21, 2013, the MDE sent GenOn Mid-Atlantic a similar letter with respect to the Chalk Point and Dickerson facilities, threatening to sue within 60 days if the facilities were not brought into compliance. On June 11, 2013, the Maryland Attorney General on behalf of the MDE filed a complaint in the U.S. District Court for the District of Maryland alleging violations of the Clean Water Act and Maryland environmental laws related to water. The lawsuit is ongoing and seeks injunctive relief and civil penalties in excess of $100,000.

Chapter 11 Proceedings (GenOn and GenOn Americas Generation)

In July 2003, and various dates thereafter, the Mirant Debtors filed voluntary petitions in the Bankruptcy Court for relief under Chapter 11 of the U.S. Bankruptcy Code. GenOn Energy Holdings and most of the other Mirant Debtors emerged from bankruptcy on January 3, 2006, when the 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 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 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.

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Note 8 — Regulatory Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 19, Regulatory Matters, to the Registrants' 2013 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

Court Rejects FERC’s Jurisdiction Over Demand Response — On May 23, 2014, the U.S. Court of Appeals for the District of Columbia Circuit vacated FERC’s rules (known as Order No. 745) that allow demand response resources to participate in the FERC-jurisdictional energy markets. The Court of Appeals held that the Federal Power Act does not authorize FERC to exercise jurisdiction over demand response and that instead demand response is part of the retail market over which the states have jurisdiction. The specific order being challenged related solely to energy market participation, but this ruling also calls into question whether demand response will be permitted to participate in the capacity markets in the future. FERC has asked the U.S. Court of Appeals for the District of Columbia Circuit to rehear en banc the decision. The eventual outcome of this proceeding could result in refunds of payments made for non-jurisdictional services and resettlement of wholesale markets but it is not possible to estimate the impact on the Registrants at this time.

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Note 9 — Environmental Matters (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic)

This footnote should be read in conjunction with the complete description under Note 20, Environmental Matters, to the Registrants' 2013 Form 10-K.

The Registrants are subject to a wide range of environmental laws in the development, ownership, construction and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and during operation of power plants. Environmental laws have become increasingly stringent and the Registrants expect this trend to continue. The electric generation industry is likely to face new requirements to address various emissions, including greenhouse gases, as well as combustion byproducts, water discharge and use, and threatened and endangered species. 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' operations.

The EPA released CSAPR in 2011, which was scheduled to replace CAIR in January 2012. In December 2011, the U.S. Court of Appeals for the District of Columbia Circuit stayed the implementation of CSAPR and then issued an opinion in August 2012 vacating CSAPR and keeping CAIR in place until the EPA can replace it. On April 29, 2014, the U.S. Supreme Court reversed and remanded the D.C. Circuit's opinion. The Registrants expect further proceedings in the Court of Appeals over the next few months. While the Registrants are unable to predict the final outcome of the ongoing litigation, the Registrants believe their investment in pollution controls and cleaner technologies coupled with planned plant retirements should leave the fleet well positioned for compliance.

In January 2014, EPA re-proposed the NSPS for CO₂ emissions from new fossil-fuel-fired electric generating units that had been previously proposed in April 2012. The re-proposed standards are 1,000 pounds of CO₂ per MWh for large gas units and 1,100 pounds of CO₂ per MWh for coal units and small gas units. Proposed standards are in effect until a final rule is published or another rule is re-proposed. On June 18, 2014, the EPA proposed a rule that would require states to develop CO₂ emission standards that would apply to existing fossil-fueled generating facilities. Specifically, the EPA proposed state-specific rate-based standards for CO₂ emissions, as well as guidelines for states to follow in developing plans to achieve the state-specific standards. The EPA anticipates finalizing this rule in June 2015.

Water

In May 2014,the EPA released a prepublication version of the final regulation regarding once through cooling from 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.

East Region

The MDE has announced that it intends to promulgate more stringent regulations regarding SO₂ and NO_x emissions, which could negatively affect certain of the Registrants' coal facilities located in Maryland.

Environmental Capital Expenditures

Based on current rules, technology and preliminary plans based on some proposed rules, GenOn estimates that environmental capital expenditures from 2014 through 2018 required to comply with regulatory environmental laws will be approximately $123 million for GenOn, which includes $13 million for GenOn Americas Generation, which was adjusted for the sale of Kendall on January 31, 2014. The amount for GenOn Americas Generation includes $8 million for GenOn Mid-Atlantic.

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Item 2 — MANAGEMENT'S NARRATIVE ANALYSIS OF THE RESULTS OF OPERATIONS AND FINANCIAL CONDITION (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 six months endedJune 30, 2014 and 2013. Also, refer to the Registrants' 2013 Form 10-K, which includes detailed discussions of various items impacting the Registrants' business, results of operations and financial condition.

Overview

The following tables summarize the Registrants' generation portfolio as of June 30, 2014, by operating segment which includes forty-one, fossil fuel plants owned or leased by GenOn, of which seven are owned or leased by GenOn Americas Generation, and three are owned or leased by GenOn Mid-Atlantic. On January 31, 2014, GenOn, through a subsidiary of GenOn Americas Generation, completed the sale of Kendall, a 256 MW natural gas and oil facility in Cambridge, MA. 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:

The following table summarizes GenOn's generation portfolio as of June 30, 2014.

	(In MW)
Generation Type	South Central	East (a)(b)(c)(d)(e)	West	Total
Natural gas	1,198	6,151	4,435	11,784
Coal	—	5,740	—	5,740
Oil	—	2,059	—	2,059
Total generation capacity	1,198	13,950	4,435	19,583

(a) GenOn notified PJM that it no longer intends to deactivate Portland Units 1 and 2 (401 MW), but instead mothballed those units effective June 1, 2014, with an expected return to service no later than June 1, 2016 using ultra-low sulfur diesel.

(b) GenOn notified PJM that it no longer intends to place the coal-fired Units 1, 2, 3, and 4 at Shawville generating facility (597 MW) in long term protective layup. Instead those Units will be mothballed beginning on April 16, 2015, with an expected return to service no later than June 1, 2016 using natural gas.

(c) GenOn notified PJM that it no longer intends to deactivate Chalk Point Units 1 and 2 (667 MW) on May 31, 2017, but instead has changed that deactivation date to May 31, 2018.

(d) GenOn notified PJM that it no longer intends to deactivate Dickerson Units 1, 2 and 3 (537 MW) on May 31, 2017, but instead has changed that deactivation date May 31, 2018.

(e) GenOn intends to continue operations at Avon Lake Units 7 and 9 and New Castle Units 3, 4, and 5, which are currently operating coal units that had been scheduled for deactivation in April 2015. GenOn intends to add natural gas capabilities at these units by summer of 2016.

The following table summarizes GenOn Americas Generation's generation portfolio as of June 30, 2014.

	(In MW)
Generation Type	East (a)(b)	West	Total
Natural gas	2,700	1,029	3,729
Coal	2,433	—	2,433
Oil	1,434	—	1,434
Total generation capacity	6,567	1,029	7,596

(a) GenOn notified PJM that it no longer intends to deactivate Chalk Point Units 1 and 2 (667 MW) on May 31, 2017, but instead has changed that deactivation date to May 31, 2018.

(b) GenOn notified PJM that it no longer intends to deactivate Dickerson Units 1, 2 and 3 (537 MW) on May 31, 2017, but instead has changed that deactivation date to May 31, 2018.

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The following table summarizes GenOn Mid-Atlantic's generation portfolio as of June 30, 2014.

	(In MW)
Generation Type	East (a)(b)
Natural gas	1,942
Coal	2,433
Oil	308
Total generation capacity	4,683

(a) GenOn notified PJM that it no longer intends to deactivate Chalk Point Units 1 and 2 (667 MW) on May 31, 2017, but instead has changed that deactivation date to May 31, 2018.

(b) GenOn notified PJM that it no longer intends to deactivate Dickerson Units 1, 2 and 3 (537 MW) on May 31, 2017, but instead has changed that deactivation date to May 31, 2018.

Environmental Matters

The Registrants are subject to a wide range of environmental laws in the development, ownership, construction and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and during operation of power plants. Environmental laws have become increasingly stringent and the Registrants expect this trend to continue. The electric generation industry is likely to face new requirements to address various emissions, including greenhouse gases, as well as combustion byproducts, water discharge and use, and threatened and endangered species. In general, future laws are expected to require the addition of emissions controls or other environmental quality equipment or the imposition of certain 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 relative certainty of the requirements, an evaluation of compliance options, and the expected economic returns on capital. See Note 7, Commitments and Contingencies, and Note 9,Environmental Matters, to the Condensed Consolidated Financial Statements of this Form 10-Q for further discussion.

Regulatory Matters

As operators of power plants and participants in wholesale energy markets, certain of the Registrants' entities are subject to regulation by various federal and state government agencies. These include the Commodities Futures Trading Commission 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.

National

Court Rejects FERC’s Jurisdiction Over Demand Response — On May 23, 2014, the U.S. Court of Appeals for the District of Columbia Circuit vacated FERC’s rules (known as Order No. 745) that allow demand response resources to participate in the FERC-jurisdictional energy markets. The Court of Appeals held that the Federal Power Act does not authorize FERC to exercise jurisdiction over demand response and that instead demand response is part of the retail market over which the states have jurisdiction. The specific order being challenged related solely to energy market participation, but this ruling also calls into question whether demand response will be permitted to participate in the capacity markets in the future. FERC has asked the U.S. Court of Appeals for the District of Columbia Circuit to rehear en banc the decision. The outcome of this proceeding could result in refunds of payments made for non-jurisdictional services and resettlement of wholesale markets but it is not possible to estimate the impact on the Registrants at this time.

34

East Region

PJM

New Jersey and Maryland’s Generator Contracting Programs — The New Jersey Board of Public Utilities and the Maryland Public Service Commission awarded long-term power purchase contracts to generation developers to encourage the construction of new generation capacity in the respective States.  The constitutionality of the long-term contracts was challenged and the U.S. District Court for the District of New Jersey (in an October 25, 2013 decision) and the U.S. District Court for the District of Maryland (in an October 24, 2013 decision) found that the respective contracts violated the Supremacy Clause of the U.S. Constitution and were preempted.  On June 30, 2014, the U.S. Court of Appeals for the Fourth Circuit affirmed the Maryland District Court's decision. The appeal of the New Jersey decision is still pending before the U.S. Court of Appeals for the Third Circuit. These decisions may affect future capacity prices in PJM.

Capacity Replacement — On March 10, 2014, PJM filed at FERC to limit speculation in the annual capacity auction. Specifically, PJM proposed tariff changes that will restore incentives to submit offers for only capacity resources that are reasonably expected to be provided as a physical resource by the start of the delivery year. These changes include the addition of a replacement capacity adjustment charge that is intended to remove the incentive to profit from replacing capacity commitments, an increase in deficiency penalties for non-performance, and a reduction in the number of Incremental Auctions from three to one. On May 9, 2014, FERC rejected PJM’s proposed changes to address replacement capacity and incremental auction design, but established a Section 206 proceeding and technical conference to find a just-and-reasonable outcome. The date for this hearing has not yet been set. The Section 206 proceeding and technical conference could have a material impact on future PJM capacity prices.

Capacity Import Limits — On April 22, 2014, FERC approved PJM’s proposal to add a limit on the amount of capacity from external resources that PJM can reliably import into the PJM market. The capacity import limit will be in effect for the 2017/18 Base Residual Auction, may decrease the amount of capacity imports allowed into PJM as compared to recent auctions, and could have a material impact on future PJM capacity prices. The matter is pending rehearing at FERC.

Demand Response Operability — On May 9, 2014, FERC largely accepted PJM’s proposed changes on Demand Response Operability in an attempt to enhance the operational flexibility of demand response resources during the operating day. The approval of these changes will likely limit the amount of demand response resources eligible to participate in the PJM capacity market. The matter is pending rehearing at FERC.

New England (GenOn and GenOn Americas Generation)

Performance Incentive Proposal — On January 17, 2014, ISO-NE filed at FERC to fundamentally revamp its forward capacity market, or FCM, by making a resource’s forward capacity market compensation dependent on resource output during short intervals of operating reserve scarcity.  The ISO-NE proposal would replace the existing shortage event penalty structure with a new performance incentive, or PI, mechanism, resulting in capacity payments to resources that would be the combination of two components: (1) a base capacity payment and (2) a performance payment or charge.  The performance payment or charge would be entirely dependent upon the resource’s delivery of energy or operating reserves during scarcity conditions and could be larger than the base payment. 

NEPOOL, the ISO-NE stakeholder group, filed an alternative proposal to ISO-NE’s PI proposal at FERC, under which the market rules would be revised to maintain the FCM capacity product as a tool to ensure resource adequacy and would place real-time performance incentive-related improvements directly into the energy and reserve markets.  The Registrants supported the NEPOOL alternative. 

On May 30, 2014, FERC rejected both proposals, but found that most of the provisions in the ISO-NE proposal, with modifications, together with an increase to the reserve constraint penalty factors from the NEPOOL proposal, provided a just and reasonable structure. FERC adopted these aspects of the ISO-NE and NEPOOL proposals. FERC instituted a proceeding for further hearings and required ISO-NE to make a compliance filing to modify its proposal and adopt the increases to the reserve constraint penalty factors in NEPOOL’s proposal.  The matter is pending rehearing at FERC.

Sloped Demand Curve Filing — On May 30, 2014, FERC accepted the proposed tariff revisions discussed in the April 1, 2014, ISO-NE filing at FERC regarding the establishment of a sloped demand curve for use in the ISO-NE Forward Capacity Market. The accepted tariff changes include extending the period during which a market participant can lock-in the capacity price for a new resource from five to seven years, establishing a limited exemption for the buyer-side market mitigation rules for a set amount of renewable resources, and eliminating the administrative pricing rules. The shift away from the current vertical demand curve and accompanying proposed changes could have a material impact on the capacity prices in future auctions. The matter is still subject to rehearing at FERC.

35

New York

NYSPSC Order Rescinding Danskammer Retirement—On October 28, 2013, the NYSPSC took emergency action to rescind its approval for the 530 MW Danskammer facility to retire on October 30, 2013.  The NYSPSC’s stated goal was to allow the facility to return to service in order to constrain rate increases in New York.  The NYPSC approved the emergency order and granted an extension until March 17, 2014 for Helios Capital LLC to file its plan to operate or retire the unit.  On March 28, 2014, the NYPSC adopted the October 28, 2013 order as permanent rule.  The return to service of this facility may affect capacity prices received by the Registrants for their resources in the Rest-of-State capacity zone and the Lower Hudson Valley capacity zone.

Demand Curve Reset and the Lower Hudson Valley Zone — On May 27, 2014, FERC denied rehearing and phase-in requests regarding its August 13, 2013 order on the creation of the Lower Hudson Valley Capacity Zone. The NYISO had previously approved the creation of a new Lower Hudson Valley Capacity Zone in New York, as part of the NYISO’s triennial adjustment of its capacity market parameters for the 2014-2017 periods. The State of New York, NYSPSC and Central Hudson Gas & Electric Corp. have challenged the FERC order before the U.S. Court of Appeals for the Second Circuit.

Gulf Coast Region

MISO (GenOn)

On July 5, 2013, AmerenEnergy Resources Generating Company, or Ameren, filed a complaint against MISO pertaining to the compensation for generators asked by MISO to provide service past their retirement date due to reliability concerns, or RMR Generators.  Ameren asked FERC to require MISO to provide such generators their full cost of service as compensation and not merely cover the generator's incremental costs of operation going-forward costs.  The Registrants supported the Complaint.  On July 22, 2014, FERC issued an Order denying the complaint in part and granting it in part.  FERC found that the Tariff was unjust and unreasonable because it did not allow RMR Generators to obtain compensation for their fixed costs, which are recovered as depreciation expense, return on rate base and associated taxes. 

New and On-going Company Initiatives

Fuel Conversions

The Registrants will continue operations at the Avon Lake facility Units 7 and 9 and the New Castle facility Units 3, 4, and 5, which are currently operating coal units that had been scheduled for deactivation in April 2015. The Registrants intend to add natural gas capabilities at these units, which additions are expected to be completed by the summer of 2016. In late April 2014, the Registrants notified PJM that they no longer intend to place coal-fired Units 1, 2, 3, and 4 at Shawville generating facility (597 MW) in long term protective layup, but instead will mothball those units beginning on April 16, 2015, and then return those units to service no later than June 1, 2016 using natural gas.

In late April 2014, the Registrants notified PJM that they no longer intend to deactivate Portland Units 1 and 2 (401 MW), but instead mothballed those units effective June 1, 2014, and will return those units to service no later than June 1, 2016 using ultra-low sulfur diesel.

Changes in Accounting Standards

See Note 2, Summary of Significant Accounting Policies, for a discussion of recent accounting developments.

36

Consolidated Results of Operations

GenOn

The following table provides selected financial information for GenOn:

	Three months ended June 30,								Six months ended June 30,
(In millions except otherwise noted)	2014			2013			Change %		2014			2013			Change %
Operating Revenues
Energy revenue (a)	$	416		$	424		(2	)%	$	1,410		$	908		55	%
Capacity revenue (a)	253			247			2		509			409			24
Mark-to-market for economic hedging activities	(119		)	44			N/M		(343		)	(190		)	(81	)
Other revenues (b)	8			10			(20	)	32			28			14
Total operating revenues	558			725			(23	)	1,608			1,155			39
Operating Costs and Expenses
Generation cost of sales (a)	259			274			(5	)	937			559			68
Mark-to-market for economic hedging activities	(30		)	(18		)	(67	)	(23		)	(31		)	26
Contract and emissions credit amortization	(9		)	(18		)	50		(6		)	(19		)	68
Other cost of operations	197			217			(9	)	386			436			(11	)
Total cost of operations	417			455			(8	)	1,294			945			37
Depreciation and amortization	58			71			(18	)	120			137			(12	)
Selling, general and administrative	23			21			N/M		41			54			(24	)
Selling, general and administrative - affiliate	33			19			N/M		66			36			83
Acquisition-related transaction and integration costs	1			22			(95	)	2			41			(95	)
Total operating costs and expenses	532			588			(10	)	1,523			1,213			26
Loss on sale of assets	—			—					(6		)	—
Operating Income/(Loss)	26			137			(81	)	79			(58		)	236
Other Income/(Expense)
Other income, net	1			—			N/M		2			2			—
Interest expense	(51		)	(56		)	(9	)	(101		)	(103		)	(2	)
Loss on debt extinguishment	—			(11		)	N/M		—			(11		)	N/M
Total other expense	(50		)	(67		)	(25	)	(99		)	(112		)	(12	)
(Loss)/Income Before Income Taxes	(24		)	70			(134	)	(20		)	(170		)	88
Income tax expense/(benefit)	1			(6		)	N/M		2			(6		)	133
Net (Loss)/Income	$	(25	)	$	76		(133	)	$	(22	)	$	(164	)	87
Business Metrics
Average natural gas price — Henry Hub ($/MMBtu)	$	4.67		$	4.09		14	%	$	4.80		$	3.71		29	%
MWh sold (in thousands)	6,933			6,828			2		17,970			14,579			23
MWh generated (in thousands)	7,433			7,425			—		19,073			15,592			22

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

(b) Includes unrealized trading gains and losses.

37

Generation Gross Margin

	Three months ended June 30,				Six months ended June 30,
(In millions)	2014		2013		2014		2013
Energy revenue	$	416	$	424	$	1,410	$	908
Capacity revenue	253		247		509		409
Other revenues	8		10		32		28
Generation revenue	677		681		1,951		1,345
Generation cost of sales	259		274		937		559
Generation gross margin	$	418	$	407	$	1,014	$	786

Generation gross marginincreased by $11 million for the three months ended June 30, 2014, compared to the same period in 2013 due to:

	(In millions)
Higher gross margin due to a 12% increase in PJM hedged capacity prices as well as the creation of the Hudson Valley Load Zone	$	38
Lower gross margin due to a 5% decrease in realized energy prices, partially offset by an 8% decrease in coal prices	(7		)
Other	(20		)
	$	11

Generation gross marginincreased by $228 million for the six months ended June 30, 2014 compared to the same period in 2013 due to:

	(In millions)
Higher gross margin due to a 24% increase in PJM hedged capacity prices as well as the creation of the Hudson Valley Load Zone	$	116
Higher gross margin due to a 25% increase in generation due to weather conditions in the East as well as fewer outage hours during 2014, partially offset by an increase in natural gas prices	99
Higher gross margin due to the addition of a capacity contract for Bowline, offset in part by the deactivation of Contra Costa	13
	$	228

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 operating revenues and operating costs and expenses are as follows:

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Mark-to-market results in operating revenues
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(96	)	$	(111	)	$	(162	)	$	(224	)
Net unrealized (losses)/gains on open positions related to economic hedges	(23		)	155			(181		)	34
Total mark-to-market (losses)/gains in operating revenues	$	(119	)	$	44		$	(343	)	$	(190	)
Mark-to-market results in operating costs and expenses
Reversal of previously recognized unrealized losses on settled positions related to economic hedges	5			12			11			27
Net unrealized gains on open positions related to economic hedges	25			6			12			4
Total mark-to-market gains in operating costs and expenses	$	30		$	18		$	23		$	31

Mark-to-market results consist of unrealized gains and losses. The settlement of these transactions is reflected in the same caption as the items being hedged.

38

For the three months ended June 30, 2014, the $119 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period and a decrease in the value of forward sales of electricity contracts as a result of increases in forward power prices. The $30 million gain in operating costs and expenses from economic hedge positions was driven by an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices and the reversal of previously recognized unrealized losses from fuel contracts that settled during the period. 

For the three months ended June 30, 2013, the $44 million gain in operating revenues from economic hedge positions was driven by an increase in the value of forward sales of electricity and natural gas contracts as a result of decreases in forward power and natural gas prices partially offset by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period. The $18 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period.

For the six months ended June 30, 2014, the $343 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period and a decrease in the value of forward sales of electricity and natural gas contracts as a result of increases in forward power and natural gas prices. The $23 million gain in operating costs and expenses from economic hedge positions was driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period and an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices. 

For the six months ended June 30, 2013, the $190 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period slightly offset by an increase in the value of forward sales of electricity and natural gas contracts as a result of decreases in forward power and natural gas prices. The $31 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period.

In accordance with ASC 815, the following table represents the results of GenOn's financial and physical trading of energy commodities. The realized and unrealized financial and physical trading results are included in other operating revenues. GenOn's trading activities are subject to limits within the risk management policy. GenOn had no trading gains or losses for the three months ended June 30, 2014.

	Three months ended June 30,				Six months ended June 30,
(In millions)	2014		2013		2014			2013
Trading gains/(losses)
Realized	$	—	$	2	$	2		$	2
Unrealized	—		1		(1		)	—
Total trading gains	$	—	$	3	$	1		$	2

39

Other Cost of Operations

Other cost of operations decreased by $20 million for the three months ended June 30, 2014 compared to the same period in 2013 due to:

	(In millions)
Lower operations and maintenance expense due to the deferral of maintenance work, offset in part by increased variable costs, both resulting from increased run time, and the major outage at Morgantown in 2013	$	29
Other	(9		)
	$	20

Other cost of operations decreased by $50 million for the six months ended June 30, 2014 compared to the same period in 2013 due to:

	(In millions)
Lower operating costs due to decreased maintenance and project expenses, specifically at Morgantown where there was a major outage in 2013 with none occurring in 2014, offset in part by increased variable costs resulting from increased run time	$	38
Decrease in property tax expense associated with the decrease in the property tax assessment for Bowline	7
Other	5
	$	50

Depreciation and Amortization

Depreciation and amortization expense decreased by $13 million and $17 million for the three and six months endedJune 30, 2014 compared to the same periods in 2013.

40

GenOn Americas Generation

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

	Three months ended June 30,								Six months ended June 30,
(In millions except otherwise noted)	2014			2013			Change %		2014			2013			Change %
Operating Revenues
Energy revenue (a)	$	367		$	419		(12	)%	$	1,305		$	892		46	%
Capacity revenue (a)	246			212			16		494			361			37
Mark-to-market for economic hedging activities	(94		)	(3		)	N/M		(238		)	(153		)	(56	)
Other revenues (b)	7			10			(30	)	30			70			(57	)
Total operating revenues	526			638			(18	)	1,591			1,170			36
Operating Costs and Expenses
Generation cost of sales (a)	401			441			(9	)	1,237			892			39
Mark-to-market for economic hedging activities	(23		)	(14		)	(64	)	(17		)	(30		)	43
Contract and emissions credit amortization	2			3			(33	)	11			9			22
Other cost of operations	88			106			(17	)	170			212			(20	)
Total cost of operations	468			536			(13	)	1,401			1,083			29
Depreciation and amortization	27			26			4		49			53			(8	)
Selling, general and administrative	27			23			17		47			44			7
Total operating costs and expenses	522			585			(11	)	1,497			1,180			27
Loss on sale of assets	—			—					(6		)	—
Operating Income/(Loss)	4			53			(92	)	88			(10		)	N/M
Other Expense
Interest expense	(18		)	(18		)	—		(37		)	(36		)	3
Total other expense	(18		)	(18		)	—		(37		)	(36		)	3
Income/(Loss) Before Income Taxes	(14		)	35			(140	)	51			(46		)	211
Income taxes	—			—			—		—			—			N/M
Net Income/(Loss)	$	(14	)	$	35		(140	)	$	51		$	(46	)	211
Business Metrics
Average natural gas price — Henry Hub ($/MMBtu)	$	4.67		$	4.09		14	%	$	4.80		$	3.71		29	%
MWh sold (in thousands)	2,917			1,957			49		7,546			4,598			64
MWh generated (in thousands)	2,949			2,016			46		7,587			4,708			61

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

(b)    Includes unrealized trading gains and losses

41

Generation Gross Margin

	Three months ended June 30,				Six months ended June 30,
(In millions)	2014		2013		2014		2013
Energy revenue	$	367	$	419	$	1,305	$	892
Capacity revenue	246		212		494		361
Other revenues	7		10		30		70
Generation revenue	620		641		1,829		1,323
Generation cost of sales	401		441		1,237		892
Generation gross margin	$	219	$	200	$	592	$	431

Generation gross margin increased by $19 million for the three months ended June 30, 2014, compared to the same period in 2013 due to:

	(In millions)
Higher gross margin due to a 62% increase in generation at GenOn Mid-Atlantic due to fewer outage hours in 2014	$	72
Lower gross margin due to a 29% decrease in realized energy prices and partially offset by a 16% decrease in coal prices	(67		)
Higher gross margin due to a 15% increase in PJM hedged capacity prices as well as the creation of the Hudson Valley Load Zone	16
Higher gross margin due to the addition of a new capacity contract for Bowline	1
Other	(3		)
	$	19

Generation gross margin increased by $161 million for the six months ended June 30, 2014, compared to the same period in 2013 due to:

	(In millions)
Higher gross margin due to a 76% increase in generation at GenOn Mid-Atlantic due to weather conditions in the East as well as fewer outage hours in 2014	$	156
Lower gross margin due to a 10% decrease in realized energy prices at GenOn Mid-Atlantic, partially offset by a 6% decrease in coal prices	(62		)
Higher gross margin due to a 30% increase in PJM hedged capacity prices as well as the creation of the Hudson Valley Load Zone	48
Higher gross margin due to the addition of a new capacity contract for Bowline offset in part by the deactivation of Contra Costa in 2013	9
Other	10
	$	161

42

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 operating revenues and operating costs and expenses are as follows:

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Mark-to-market results in operating revenues
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(83	)	$	(86	)	$	(144	)	$	(175	)
Net unrealized (losses)/gains on open positions related to economic hedges	(11		)	83			(94		)	22
Total mark-to-market losses in operating revenues	(94		)	(3		)	(238		)	(153		)
Mark-to-market results in operating costs and expenses
Reversal of previously recognized unrealized losses on settled positions related to economic hedges	4			11			8			26
Net unrealized gains on open positions related to economic hedges	19			3			9			4
Total mark-to-market gains in operating costs and expenses	$	23		$	14		$	17		$	30

Mark-to-market results consist of unrealized gains and losses. The settlement of these transactions is reflected in the same caption as the items being hedged.

For the three months ended June 30, 2014, the $94 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period and a decrease in the value of forward sales of electricity contracts as a result of increases in forward power prices. The $23 million gain in operating costs and expenses from economic hedge positions was driven by an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices and the reversal of previously recognized unrealized losses from fuel contracts that settled during the period. 

For the three months ended June 30, 2013, the $3 million loss in operating revenues from economic hedge positions was 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 electricity and natural gas contracts as a result of decreases in forward power and natural gas prices. The $14 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period.

For the six months ended June 30, 2014, the $238 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period and a decrease in the value of forward sales of electricity and natural gas contracts as a result of increases in forward power and natural gas prices. The $17 million gain in operating costs and expenses from economic hedge positions was driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period and by an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices. 

For the six months ended June 30, 2013, the $153 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period partially offset by an increase in the value of forward sales of electricity and natural gas contracts as a result of decreases in forward power and natural gas prices. The $30 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period.

43

In accordance with ASC 815, the following table represents the results of GenOn Americas Generation's financial and physical trading of energy commodities. The realized and unrealized financial and physical trading results are included in other operating revenues. GenOn Americas Generation's trading activities are subject to limits within the risk management policy. GenOn Americas Generation had no trading gains or losses for the three months ended June 30, 2014.

	Three months ended June 30,				Six months ended June 30,
(In millions)	2014		2013		2014			2013
Trading gains/(losses)
Realized	$	—	$	2	$	2		$	2
Unrealized	—		1		(1		)	—
Total trading gains	$	—	$	3	$	1		$	2

Other Cost of Operations

Other cost of operations decreased by $18 million for the three months ended June 30, 2014, compared to the same period in 2013 due to:

	(In millions)
Lower operating costs due to decreased maintenance and project expenses, specifically at Morgantown where there was a major outage in 2013 with none occurring in 2014	$	21
Other	(3		)
	$	18

Other cost of operations decreased by $42 million for the six months ended June 30, 2014, compared to the same period in 2013 due to:

	(In millions)
Lower operating costs due to decreased maintenance and project expenses, specifically at Morgantown where there was a major outage in 2013 with none occurring in 2014	$	33
Decrease in property tax expense associated with the decrease in property tax assessment for Bowline	7
Other	2
	$	42

44

GenOn Mid-Atlantic

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

	Three months ended June 30,								Six months ended June 30,
(In millions except otherwise noted)	2014			2013			Change %		2014			2013			Change %
Operating Revenues
Energy revenue (a)	$	207		$	180		15	%	$	588		$	372		58	%
Capacity revenue (a)	79			67			18		168			121			39
Mark-to-market for economic hedging activities	(93		)	(4		)	N/M		(243		)	(152		)	(60	)
Other revenues	3			—			100		10			—			100
Total operating revenues	196			243			(19	)	523			341			53
Operating Costs and Expenses
Generation cost of sales (a)	107			77			39		279			150			86
Mark-to-market for economic hedging activities	(23		)	(14		)	(64	)	(18		)	(30		)	40
Contract and emissions credit amortization	2			4			(50	)	9			9			—
Other cost of operations	60			80			(25	)	125			156			(20	)
Total cost of operations	146			147			(1	)	395			285			39
Depreciation and amortization	24			19			26		$	43		38			13
Selling, general and administrative	20			17			18		$	35		33			6
Total operating costs and expenses	190			183			4		473			356			33
Operating Income/(Loss)	6			60			(90	)	50			(15		)	N/M
Other Expense
Interest expense	(2		)	(1		)	(100	)	(3		)	(2		)	50
Total other expense	(2		)	(1		)	100		(3		)	(2		)	50
Income/(Loss) Before Income Taxes	4			59			(93	)	47			(17		)	N/M
Income taxes	—			—			—		—			—			N/M
Net Income/(Loss)	$	4		$	59		(93	)	$	47		$	(17	)	N/M
Business Metrics
Average natural gas price — Henry Hub ($/MMBtu)	$	4.67		$	4.09		14	%	$	4.80		$	3.71		29	%
MWh sold (in thousands)	2,734			1,690			62		6,335			3,596			76
MWh generated (in thousands)	2,734			1,690			62		6,335			3,596			76

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

45

Generation Gross Margin

	Three months ended June 30,				Six months ended June 30,
(In millions)	2014		2013		2014		2013
Energy revenue	$	207	$	180	$	588	$	372
Capacity revenue	79		67		168		121
Other revenues	3		—		10		—
Generation revenue	289		247		766		493
Generation cost of sales	107		77		279		150
Generation gross margin	$	182	$	170	$	487	$	343

Generation gross margin increased by $12 million for the three months ended June 30, 2014, compared to the same period in 2013 due to:

	(In millions)
Higher gross margin due to a 62% increase in generation due to fewer outage hours in 2014	$	72
Lower gross margin due to a 29% decrease in realized energy prices partially offset by a 16% decrease in coal prices	(67		)
Higher gross margin due to a 15% increase in hedged capacity prices	12
Other	(5		)
	$	12

Generation gross margin increased by $144 million for the six months ended June 30, 2014, compared to the same period in 2013 due to:

	(In millions)
Higher gross margin due to a 76% increase in generation due to weather conditions in the East as well as fewer outage hours during 2014	$	156
Lower gross margin due to a 10% decrease in realized energy prices partially offset by a 6% decrease in coal prices	(62		)
Higher gross margin due to a 30% increase in hedged capacity prices	46
Other	4
	$	144

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 operating revenues and operating costs and expenses are as follows:

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Mark-to-market results in operating revenues
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(81	)	$	(87	)	$	(149	)	$	(176	)
Net unrealized (losses)/gains on open positions related to economic hedges	(12		)	83			(94		)	24
Total mark-to-market losses in operating revenues	(93		)	(4		)	(243		)	(152		)
Mark-to-market results in operating costs and expenses
Reversal of previously recognized unrealized losses on settled positions related to economic hedges	4			11			9			26
Net unrealized gains on open positions related to economic hedges	19			3			9			4
Total mark-to-market gains in operating costs and expenses	$	23		$	14		$	18		$	30

Mark-to-market results consist of unrealized gains and losses. The settlement of these transactions is reflected in the same caption as the items being hedged.

46

For the three months ended June 30, 2014, the $93 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period and a decrease in the value of forward sales of electricity contracts as a result of increases in forward power prices. The $23 million gain in operating costs and expenses from economic hedge positions was driven by an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices and the reversal of previously recognized unrealized losses from fuel contracts that settled during the period. 

For the three months ended June 30, 2013, the $4 million loss in operating revenues from economic hedge positions was 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 electricity and natural gas contracts as a result of decreases in forward power and natural gas prices. The $14 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period.

For the six months ended June 30, 2014, the $243 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period and a decrease in the value of forward sales of electricity and natural gas contracts as a result of increases in forward power and natural gas prices. The $18 million gain in operating costs and expenses from economic hedge positions was driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period and by an increase in the value of forward purchases of fuel contracts as a result of increases in forward coal prices. 

For the six months ended June 30, 2013, the $152 million loss in operating revenues from economic hedge positions was driven by the reversal of previously recognized unrealized gains from electricity and natural gas contracts that settled during the period partially offset by an increase in the value of forward sales of electricity and natural gas contracts as a result of decreases in forward power and natural gas prices. The $30 million gain in operating costs and expenses from economic hedge positions was primarily driven by the reversal of previously recognized unrealized losses from fuel contracts that settled during the period.

Other Cost of Operations

Other cost of operations decreased by $20 million for the three months ended June 30, 2014, compared to the same period in 2013 due to lower operations and maintenance expense due to deferral of maintenance work combined with less operating and maintenance expenses at Morgantown which experienced a major outage in 2013.

Other cost of operations decreased by $31 million for the six months ended June 30, 2014, compared to the same period in 2013 due to lower operations and maintenance expense due to deferral of maintenance work combined with less operating and maintenance expenses at Morgantown, which experienced a major outage in 2013, and deactivation costs for Potomac River in 2013.

Liquidity and Capital Resources

Liquidity Position

As of June 30, 2014 and December 31, 2013, the Registrants' liquidity was comprised of the following:

	June 30, 2014		December 31, 2013
	(In millions)
Cash and cash equivalents (GenOn excluding GenOn Mid-Atlantic and REMA)	$	318	$	566
Cash and cash equivalents (GenOn Mid-Atlantic) (a)	35		64
Cash and cash equivalents (REMA) (a)	355		130
Total	708		760
Credit facility availability	219		151
Total liquidity	$	927	$	911

(a) At June 30, 2014, 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.

For the six months endedJune 30, 2014, total liquidity increased $16 million.

Management believes that the Registrants' liquidity position and cash flows from operations will be adequate to finance operating, maintenance and capital expenditures, to fund debt service obligations and other liquidity commitments. Management continues to regularly monitor the Registrants' ability to finance the needs of its operating, financing and investing activity within the dictates of prudent balance sheet management.

47

Restricted Payments Tests

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 Gen-On 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, REMA must be in compliance with the requirement to provide credit support to the owner lessors securing its obligation to pay scheduled rent under its 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 June 30, 2014, 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.

To the extent GenOn Mid-Atlantic or REMA are able to pay dividends to GenOn, the GenOn Senior Notes due 2018 and 2020 and the related indentures restrict the ability of GenOn to incur additional liens and make certain restricted payments, including dividends. In the event of a default or if restricted payment tests are not satisfied, GenOn would not be able to distribute cash to its parent, NRG. At June 30, 2014, GenOn met the consolidated debt ratio component of the restricted payments test.

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

In May 2014, GenOn Mid-Atlantic made a distribution of $320 million to its parent, NRG North America LLC, who in turn made a distribution of $320 million to its parent, GenOn Americas Generation. GenOn Americas Generation subsequently made a distribution to GenOn in the same amount, through its parent companies NRG Americas, Inc. and GenOn Energy Holdings, Inc.

Credit Ratings

On January 24, 2014, Moody's placed GenOn's rating under review for downgrade. On April 14, 2014, the GenOn Americas Generation Senior unsecured notes due 2021 and 2031 were downgraded by Moody's to Caa1 and the GenOn Senior unsecured notes due 2014, 2017, 2018, and 2020 were downgraded to B3. The outlook for both the GenOn Americas Generation Senior unsecured notes and the GenOn Senior unsecured notes was moved to stable.

Source 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 and cash flows from operations. 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.

48

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

Item 3 has been omitted from this report pursuant to the reduced disclosure format permitted by General Instruction H(2) to Form 10-Q.

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 report on Form 10-Q.

Changes in Internal Control over Financial Reporting

The Registrants continue to integrate certain business operations, information systems, processes and related internal control over financial reporting as a result of business acquisitions.  The Registrants will continue to assess the effectiveness of internal control over financial reporting as integration activities continue.

49

PART II

OTHER INFORMATION

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

For a discussion of material legal proceedings in which the Registrants were involved through June 30, 2014, see Note 7, Commitments and Contingencies, to 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' 2013 Form 10-K. There have been no material changes in the Registrants' risk factors since those reported in its 2013 Form 10-K.

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

Item 2 has been omitted from this report for the Registrants pursuant to the reduced disclosure format permitted by General Instruction H(2) to Form 10-Q.

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

Item 3 has been omitted from this report for the Registrants pursuant to the reduced disclosure format permitted by General Instruction H(2) to Form 10-Q.

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.

50

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

GenOn Energy, Inc. Exhibit Index

Number	Description	Method of Filing
31.1A1	Rule 13a-14(a)/15d-14(a) certification of David Crane	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 Ronald B. Stark	Filed herewith
32.A1	Section 1350 Certification	Filed 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 Americas Generation, LLC Exhibit Index

Number	Description	Method of Filing
31.1A2	Rule 13a-14(a)/15d-14(a) certification of David Crane	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 Ronald B. Stark	Filed herewith
32.A2	Section 1350 Certification	Filed 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
31.1A3	Rule 13a-14(a)/15d-14(a) certification of David Crane	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 Ronald B. Stark	Filed herewith
32.A3	Section 1350 Certification	Filed 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

51

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/ DAVID CRANE
	David Crane Chief Executive Officer
	(Principal Executive Officer)
	/s/ KIRKLAND B. ANDREWS
	Kirkland B. Andrews Chief Financial Officer
	(Principal Financial Officer)
	/s/ RONALD B. STARK
	Ronald B. Stark Chief Accounting Officer
	(Principal Accounting Officer)

Date: August 7, 2014

52

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/ DAVID CRANE
	David Crane Chief Executive Officer
	(Principal Executive Officer)
	/s/ KIRKLAND B. ANDREWS
	Kirkland B. Andrews Chief Financial Officer
	(Principal Financial Officer)
	/s/ RONALD B. STARK
	Ronald B. Stark Chief Accounting Officer
	(Principal Accounting Officer)

Date: August 7, 2014

53

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/ DAVID CRANE
	David Crane Chief Executive Officer
	(Principal Executive Officer)
	/s/ KIRKLAND B. ANDREWS
	Kirkland B. Andrews Chief Financial Officer
	(Principal Financial Officer)
	/s/ RONALD B. STARK
	Ronald B. Stark Chief Accounting Officer
	(Principal Accounting Officer)

Date: August 7, 2014

54

EX-31.1A1

EXHIBIT 31.1 A1

CERTIFICATION

I, David Crane, 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 CRANE

David Crane

Chief Executive Officer

(Principal Executive Officer)

Date: August 7, 2014

EX-31.1A2

EXHIBIT 31.1 A2

CERTIFICATION

I, David Crane, 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 CRANE

David Crane

Chief Executive Officer

(Principal Executive Officer)

Date: August 7, 2014

EX-31.1A3

EXHIBIT 31.1 A3

CERTIFICATION

I, David Crane, 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 CRANE

David Crane

Chief Executive Officer

(Principal Executive Officer)

Date: August 7, 2014

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: August 7, 2014

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: August 7, 2014

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: August 7, 2014

EX-31.3A1

EXHIBIT 31.3 A1

CERTIFICATION

I, Ronald B. Stark, 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/ RONALD B. STARK

Ronald B. Stark

Chief Accounting Officer

(Principal Accounting Officer)

Date: August 7, 2014

EX-31.3A2

EXHIBIT 31.3 A2

CERTIFICATION

I, Ronald B. Stark, 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/ RONALD B. STARK

Ronald B. Stark

Chief Accounting Officer

(Principal Accounting Officer)

Date: August 7, 2014

EX-31.3A3

EXHIBIT 31.3 A3

CERTIFICATION

I, Ronald B. Stark, 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/ RONALD B. STARK

Ronald B. Stark

Chief Accounting Officer

(Principal Accounting Officer)

Date: August 7, 2014

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 June 30, 2014, 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: August 7, 2014

/s/ DAVID CRANE  

David Crane

Chief Executive Officer

(Principal Executive Officer)

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

/s/ RONALD B. STARK  

Ronald B. Stark

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 June 30, 2014, 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: August 7, 2014

/s/ DAVID CRANE  

David Crane

Chief Executive Officer

(Principal Executive Officer)

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

/s/ RONALD B. STARK  

Ronald B. Stark

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 June 30, 2014, 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: August 7, 2014

/s/ DAVID CRANE  

David Crane

Chief Executive Officer

(Principal Executive Officer)

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

/s/ RONALD B. STARK  

Ronald B. Stark

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

Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified							3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended			6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended						6 Months Ended					6 Months Ended	3 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 GenOn Americas Generation	Dec. 31, 2013 GenOn Americas Generation	Jun. 30, 2014 GenOn Americas Generation GenOn Energy Holdings	Dec. 31, 2013 GenOn Americas Generation GenOn Energy Holdings	Jun. 30, 2014 GenOn Americas Generation NRG Energy	Jun. 30, 2014 GenOn Americas Generation NRG Energy	Jun. 30, 2013 GenOn Americas Generation GenOn	Jun. 30, 2013 GenOn Americas Generation GenOn	Jun. 30, 2014 GenOn Mid-Atlantic	Dec. 31, 2013 GenOn Mid-Atlantic	Jun. 30, 2014 GenOn Mid-Atlantic NRG Energy	Jun. 30, 2014 GenOn Mid-Atlantic NRG Energy	Jun. 30, 2013 GenOn Mid-Atlantic GenOn	Jun. 30, 2013 GenOn Mid-Atlantic GenOn	Jun. 30, 2014 Direct cost of operations GenOn Americas Generation GenOn	Jun. 30, 2013 Direct cost of operations GenOn Americas Generation GenOn	Jun. 30, 2014 Allocated cost of operations GenOn Americas Generation NRG Energy	Jun. 30, 2014 Allocated cost of operations GenOn Americas Generation NRG Energy	Jun. 30, 2013 Allocated cost of operations GenOn Americas Generation GenOn	Jun. 30, 2013 Allocated cost of operations GenOn Americas Generation GenOn	Jun. 30, 2014 Allocated cost of operations GenOn Mid-Atlantic NRG Energy	Jun. 30, 2014 Allocated cost of operations GenOn Mid-Atlantic NRG Energy	Jun. 30, 2013 Allocated cost of operations GenOn Mid-Atlantic GenOn	Jun. 30, 2013 Allocated cost of operations GenOn Mid-Atlantic GenOn	Jun. 30, 2014 Allocated selling, general and administrative GenOn Americas Generation NRG Energy	Jun. 30, 2014 Allocated selling, general and administrative GenOn Americas Generation NRG Energy	Jun. 30, 2013 Allocated selling, general and administrative GenOn Americas Generation GenOn	Jun. 30, 2013 Allocated selling, general and administrative GenOn Americas Generation GenOn	Jun. 30, 2014 Allocated selling, general and administrative GenOn Mid-Atlantic NRG Energy	Jun. 30, 2014 Allocated selling, general and administrative GenOn Mid-Atlantic NRG Energy	Jun. 30, 2013 Allocated selling, general and administrative GenOn Mid-Atlantic GenOn	Jun. 30, 2013 Allocated selling, general and administrative GenOn Mid-Atlantic GenOn	Jun. 30, 2014 Predecessor Direct cost of operations GenOn Americas Generation GenOn	Jun. 30, 2013 Predecessor Direct cost of operations GenOn Americas Generation GenOn	Jun. 30, 2014 Intercompany Credit Agreement	Dec. 31, 2013 Intercompany Credit Agreement	Dec. 14, 2012 Intercompany Credit Agreement	Jun. 30, 2014 Letter of Credit Intercompany Credit Agreement NRG Energy	Jun. 30, 2014 Letter of Credit Intercompany Credit Agreement GenOn Americas Generation NRG Energy	Dec. 31, 2013 Letter of Credit Intercompany Credit Agreement GenOn Americas Generation NRG Energy	Jun. 30, 2014 Letter of Credit Intercompany Credit Agreement GenOn Mid-Atlantic NRG Energy	Dec. 31, 2013 Letter of Credit Intercompany Credit Agreement GenOn Mid-Atlantic NRG Energy	Jun. 30, 2014 Annual [Domain] NRG Energy	Jun. 30, 2014 GenOn Americas Generation [Member] GenOn North America [Domain]	Jun. 30, 2014 GenOn North America [Domain] GenOn Mid-Atlantic
Related Party Transaction
Line of Credit Facility, Maximum Borrowing Capacity																																							$ 500
Line of Credit Facility, Maximum Borrowing Capacity																																					0	0
Service Management Costs																																													193
Affiliate cost recorded in selling, general and administrative																											24	42	22	42	20	35	17	33
Affiliate cost recorded in cost of operations							23	43	23	47			19	35	17	36	33	19	(1)	1	1	5	(1)	0	0	3									66	36
Letters of credit issued and oustanding on behalf of entity by affiliate																																									217	258	281	349
Term of Facility																																								3 years
Debt instrument, interest rate over variable rate (as a percent)																																								2.50%
Basis points added to interest under LIBOR rate loans (as a percent)																																								3.50%
Current note receivable from affiliate					189	299
Sale of NRG Marsh Landing Holdings LLC to NRG Yield LLC [Abstract]
Property, plant and equipment	3,121	3,176	1,107	1,194							950	987
Total assets	5,826	5,734	3,422	2,963							1,644	1,872
Total liabilities	5,525	5,421	2,899	2,272							838	794
Dividends																																														$ 320	$ 320

XML

Fair Value of Financial Instruments (Details 2) (Fair Value, Measurements, Recurring, USD $)	Jun. 30, 2014		Dec. 31, 2013
Level 1
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	$ 21,000,000	[1],[2]	$ 37,000,000	[2],[3]
Level 1 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	108,000,000	[1]	141,000,000	[3]
Derivative liabilities	19,000,000	[1]	25,000,000	[3]
Level 2
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	0	[1],[2]	0	[2],[3]
Level 2 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	646,000,000	[1]	507,000,000	[3]
Derivative liabilities	548,000,000	[1]	149,000,000	[3]
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	12,000,000		3,000,000
Derivative liabilities	56,000,000		7,000,000
Fair Value
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	21,000,000	[2]	37,000,000	[2]
Fair Value | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	766,000,000		651,000,000
Derivative liabilities	623,000,000		181,000,000
GenOn Americas Generation | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	1,024,000,000		308,000,000
GenOn Americas Generation | Level 1 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	117,000,000	[1]	153,000,000	[3]
Derivative liabilities	51,000,000	[1]	74,000,000	[3]
GenOn Americas Generation | Level 2 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,088,000,000	[1]	575,000,000	[3]
Derivative liabilities	910,000,000	[1]	226,000,000	[3]
GenOn Americas Generation | Fair Value, Inputs, Level 3 [Member] | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	22,000,000		7,000,000
Derivative liabilities	63,000,000		8,000,000
GenOn Americas Generation | Fair Value | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,227,000,000		735,000,000
GenOn Mid-Atlantic | Level 1 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	74,000,000	[1]	87,000,000	[3]
Derivative liabilities	9,000,000	[1]	13,000,000	[3]
GenOn Mid-Atlantic | Level 2 | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	276,000,000	[1]	420,000,000	[3]
Derivative liabilities	94,000,000	[1]	60,000,000	[3]
GenOn Mid-Atlantic | Fair Value, Inputs, Level 3 [Member] | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,000,000		0
Derivative liabilities	43,000,000		0
GenOn Mid-Atlantic | Fair Value | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	352,000,000		507,000,000
Derivative liabilities	$ 146,000,000		$ 73,000,000

[1] There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

[2] Relates to mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees

[3] There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

XML

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2014

Significant 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)

Recent Accounting Developments

ASU 2014-09 - In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU No. 2014-09. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Registrants are currently evaluating the impact of the standard on the Registrants' results of operations, cash flows and financial position.

ASU 2013-11 - In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740) Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, or ASU No. 2013-11.  The amendments of ASU No. 2013-11, which were adopted on January 1, 2014, require an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction of a deferred tax asset for a net operating loss, or NOL, a similar tax loss or tax credit carryforward rather than a liability when the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and the entity intends to use the deferred tax asset for that purpose. The adoption of this standard did not impact the Registrants' results of operations or cash flows.

XML

Accounting for Derivative Instruments and Hedging Activities (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Effects GenOn's Accumulated OCI Balance Attributable to Cash Flow Hedge Derivatives
Accumulated OCI balance, beginning of period	$ 0	$ 2	$ 0	$ 1
Recognized in OCI on interest rate derivatives	0	17	0	19
Reclassified from accumulated OCI into earnings(a)(b)	(25)	76	(22)	(164)
Accumulated OCI balance, end of period	$ 0	$ 18	$ 0	$ 18

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Accounting for Derivative Instruments and Hedging Activities (Details) (USD $)	3 Months Ended				6 Months Ended																											6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013	Jun. 30, 2014 Derivatives Not Designated as Cash Flow Hedges	Dec. 31, 2013 Derivatives Not Designated as Cash Flow Hedges	Jun. 30, 2014 Derivatives Not Designated as Cash Flow Hedges Commodity contracts current	Dec. 31, 2013 Derivatives Not Designated as Cash Flow Hedges Commodity contracts current	Jun. 30, 2014 Derivatives Not Designated as Cash Flow Hedges Commodity contracts long-term	Dec. 31, 2013 Derivatives Not Designated as Cash Flow Hedges Commodity contracts long-term	Jun. 30, 2014 GenOn Americas Generation	Dec. 31, 2013 GenOn Americas Generation	Jun. 30, 2014 GenOn Americas Generation Derivatives Not Designated as Cash Flow Hedges	Dec. 31, 2013 GenOn Americas Generation Derivatives Not Designated as Cash Flow Hedges	Jun. 30, 2014 GenOn Americas Generation Derivatives Not Designated as Cash Flow Hedges Commodity contracts current	Dec. 31, 2013 GenOn Americas Generation Derivatives Not Designated as Cash Flow Hedges Commodity contracts current	Jun. 30, 2014 GenOn Americas Generation Derivatives Not Designated as Cash Flow Hedges Commodity contracts long-term	Dec. 31, 2013 GenOn Americas Generation Derivatives Not Designated as Cash Flow Hedges Commodity contracts long-term	Jun. 30, 2014 GenOn Mid-Atlantic	Dec. 31, 2013 GenOn Mid-Atlantic	Jun. 30, 2014 GenOn Mid-Atlantic Derivatives Not Designated as Cash Flow Hedges	Dec. 31, 2013 GenOn Mid-Atlantic Derivatives Not Designated as Cash Flow Hedges	Jun. 30, 2014 GenOn Mid-Atlantic Derivatives Not Designated as Cash Flow Hedges Commodity contracts current	Dec. 31, 2013 GenOn Mid-Atlantic Derivatives Not Designated as Cash Flow Hedges Commodity contracts current	Jun. 30, 2014 GenOn Mid-Atlantic Derivatives Not Designated as Cash Flow Hedges Commodity contracts long-term	Dec. 31, 2013 GenOn Mid-Atlantic Derivatives Not Designated as Cash Flow Hedges Commodity contracts long-term	Jun. 30, 2014 Short Ton Coal T	Dec. 31, 2013 Short Ton Coal T	Jun. 30, 2014 Short Ton GenOn Americas Generation Coal T	Dec. 31, 2013 Short Ton GenOn Americas Generation Coal T	Jun. 30, 2014 Short Ton GenOn Mid-Atlantic Coal T	Dec. 31, 2013 Short Ton GenOn Mid-Atlantic Coal T	Jun. 30, 2014 MMbtu Natural Gas	Dec. 31, 2013 MMbtu Natural Gas	Jun. 30, 2014 MMbtu GenOn Americas Generation Natural Gas	Dec. 31, 2013 MMbtu GenOn Americas Generation Natural Gas	Jun. 30, 2014 MMbtu GenOn Mid-Atlantic Natural Gas	Dec. 31, 2013 MMbtu GenOn Mid-Atlantic Natural Gas	Jun. 30, 2014 MWh Power	Dec. 31, 2013 MWh Power	Jun. 30, 2014 MWh GenOn Americas Generation Power	Dec. 31, 2013 MWh GenOn Americas Generation Power	Jun. 30, 2014 MWh GenOn Mid-Atlantic Power	Dec. 31, 2013 MWh GenOn Mid-Atlantic Power	Jun. 30, 2014 Non-affiliate Commodity contracts	Dec. 31, 2013 Non-affiliate Commodity contracts	Jun. 30, 2014 Non-affiliate GenOn Americas Generation Commodity contracts	Dec. 31, 2013 Non-affiliate GenOn Americas Generation Commodity contracts	Jun. 30, 2014 Non-affiliate GenOn Mid-Atlantic Commodity contracts	Dec. 31, 2013 Non-affiliate GenOn Mid-Atlantic Commodity contracts	Jun. 30, 2014 Affiliate Commodity contracts	Dec. 31, 2013 Affiliate Commodity contracts	Jun. 30, 2014 Affiliate GenOn Americas Generation Commodity contracts	Dec. 31, 2013 Affiliate GenOn Americas Generation Commodity contracts	Jun. 30, 2014 Affiliate GenOn Mid-Atlantic Commodity contracts	Dec. 31, 2013 Affiliate GenOn Mid-Atlantic Commodity contracts
Volumetric Underlying Derivative Transactions
Derivative, Nonmonetary Notional Amount, Mass																																11,000,000	6,000,000	9,000,000	4,000,000	9,000,000	4,000,000
Derivative, Nonmonetary Notional Amount, Energy Measure																																						(83,000,000)	(111,000,000)	(89,000,000)	(113,000,000)	(94,000,000)	(119,000,000)	(36,000,000)	(26,000,000)	(18,000,000)	(14,000,000)	(17,000,000)	(14,000,000)
Fair Value of Derivative Instruments/Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Gross Amount of Recognized Derivative Assets										$ 766,000,000	$ 651,000,000	$ 594,000,000	$ 469,000,000	$ 172,000,000	$ 182,000,000			$ 1,227,000,000	$ 735,000,000	$ 995,000,000	$ 546,000,000	$ 232,000,000	$ 189,000,000			$ 352,000,000	$ 507,000,000	$ 239,000,000	$ 351,000,000	$ 113,000,000	$ 156,000,000																			$ 756,000,000	$ 645,000,000	$ 756,000,000	$ 643,000,000	$ 195,000,000	$ 358,000,000	$ 10,000,000	$ 6,000,000	$ 471,000,000	$ 92,000,000	$ 157,000,000	$ 149,000,000
Gross Amounts of Recognized Derivative Liabilities										623,000,000	181,000,000	547,000,000	163,000,000	76,000,000	18,000,000			1,024,000,000	308,000,000	890,000,000	267,000,000	134,000,000	41,000,000			146,000,000	73,000,000	130,000,000	64,000,000	16,000,000	9,000,000																			(607,000,000)	(178,000,000)	(607,000,000)	(178,000,000)	(22,000,000)	0	(16,000,000)	(3,000,000)	(417,000,000)	(130,000,000)	(124,000,000)	(73,000,000)
Derivative Instruments																																																		(557,000,000)	(154,000,000)	(557,000,000)	(154,000,000)	(20,000,000)	0	(10,000,000)	(3,000,000)	(417,000,000)	(92,000,000)	(124,000,000)	(73,000,000)
Derivative Instruments																																																		557,000,000	154,000,000	557,000,000	154,000,000	20,000,000	0	10,000,000	3,000,000	417,000,000	92,000,000	124,000,000	73,000,000
Cash Collateral (Held)	0				0				(56,000,000)							0	(56,000,000)																																	0	(56,000,000)	0	(56,000,000)	0	0	0	0	0	0	0	0
Cash Collateral Posted	(223,000,000)				(223,000,000)				(62,000,000)							(212,000,000)	(50,000,000)																																	40,000,000	0	40,000,000	0	0	0	0	0	0	0	0	0
Net Amount																																																		199,000,000	435,000,000	199,000,000	433,000,000	175,000,000	358,000,000	0	3,000,000	54,000,000	0	33,000,000	76,000,000
Net Amount																																																		(10,000,000)	(24,000,000)	(10,000,000)	(24,000,000)	(2,000,000)	0	(6,000,000)	0	0	(38,000,000)	0	0
Gross Amounts of Recognized Assets / Liabilities	143,000,000				143,000,000				470,000,000							203,000,000	427,000,000							206,000,000	434,000,000
Derivative Instruments	0				0				0							0	0							0	0
Cash Collateral (Held) / Posted	40,000,000				40,000,000				(56,000,000)							40,000,000	(56,000,000)							0	0
Net Amount	183,000,000				183,000,000				414,000,000							243,000,000	371,000,000							206,000,000	434,000,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 0	[1],[2]	$ (1,000,000)	[1],[2]	$ 0	[1],[2]	$ (2,000,000)	[1],[2]

[1] Amounts reclassified from accumulated OCI into income and amounts recognized in income from the ineffective portion of cash flow hedges are recorded in interest expense.

[2] All of the forecasted transactions (future interest payments) were deemed probable of occurring; therefore, no cash flow hedges were discontinued and no amount was recognized in GenOn’s results of operations as a result of discontinued cash flow hedges.

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Accounting for Derivative Instruments and Hedging Activities (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	$ 0	$ 17	$ 0	$ 19
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	91	99	151	197
Net unrealized gains/(losses) on open positions related to economic hedges	2	161	(169)	38
Total unrealized mark-to-market gains/(losses) for economic hedging activities	(89)	62	(320)	(159)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity	0	(1)	1	2
Net unrealized gains/(losses) on open positions related to trading activity	0	0		2
Total unrealized mark-to-market gains/(losses) for trading activity	0	1	(1)	0
Total unrealized gains/(losses)	(89)	63	(321)	(159)
Impact of derivative instruments to statement of operations
Total impact to statement of operations	(89)	63	(321)	(159)
Credit Risk Related Contingent Features
Collateral required for contracts with adequate assurance clauses in net liability positions	18		18
Collateral required for contracts with credit rating contingent features in net liability position	2		2
Collateral due on net liability position that has not been called by a certain marginable agreement counterparty	3		3
Gains (losses) included in operating revenues
Unrealized mark-to-market results
Total unrealized gains/(losses)	119	(45)	344	190
Impact of derivative instruments to statement of operations
Total impact to statement of operations	119	(45)	344	190
Gains (losses) included in cost of operations
Unrealized mark-to-market results
Total unrealized gains/(losses)	(30)	(18)	(23)	(31)
Impact of derivative instruments to statement of operations
Total impact to statement of operations	(30)	(18)	(23)	(31)
GenOn Americas Generation
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	79	75	136	149
Net unrealized gains/(losses) on open positions related to economic hedges	8	86	(85)	26
Total unrealized mark-to-market gains/(losses) for economic hedging activities	(71)	11	(221)	(123)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity	0	(1)	1	2
Net unrealized gains/(losses) on open positions related to trading activity	0	0	0	2
Total unrealized mark-to-market gains/(losses) for trading activity	0	1	(1)	0
Total unrealized gains/(losses)	(71)	12	(222)	(123)
Impact of derivative instruments to statement of operations
Total impact to statement of operations	(71)	12	(222)	(123)
GenOn Americas Generation | Gains (losses) included in operating revenues
Unrealized mark-to-market results
Total unrealized gains/(losses)	94	2	239	153
Impact of derivative instruments to statement of operations
Total impact to statement of operations	94	2	239	153
GenOn Americas Generation | Gains (losses) included in cost of operations
Unrealized mark-to-market results
Total unrealized gains/(losses)	(23)	(14)	(17)	(30)
Impact of derivative instruments to statement of operations
Total impact to statement of operations	(23)	(14)	(17)	(30)
GenOn Mid-Atlantic
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	77	76	140	150
Net unrealized gains/(losses) on open positions related to economic hedges	7	(86)	85	(28)
Total unrealized gains/(losses)	(70)	10	(225)	(122)
Impact of derivative instruments to statement of operations
Total impact to statement of operations	(70)	10	(225)	(122)
GenOn Mid-Atlantic | Gains (losses) included in operating revenues
Unrealized mark-to-market results
Total unrealized gains/(losses)	93	4	243	152
Impact of derivative instruments to statement of operations
Total impact to statement of operations	93	4	243	152
GenOn Mid-Atlantic | Gains (losses) included in cost of operations
Unrealized mark-to-market results
Total unrealized gains/(losses)	(23)	(14)	(18)	(30)
Impact of derivative instruments to statement of operations
Total impact to statement of operations	(23)	(14)	(18)	(30)
GenOn Mid-Atlantic [Member]
Credit Risk Related Contingent Features
Collateral due on net liability position that has not been called by a certain marginable agreement counterparty	$ 2		$ 2

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Segment Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information
Operating revenues	$ 558	$ 725	$ 1,608	$ 1,155
Depreciation and amortization	58	71	120	137
Income/(loss) before income taxes	(24)	70	(20)	(170)
Net income/(loss)	(25)	76	(22)	(164)
Total assets	5,826		5,826		5,734
GenOn Americas Generation
Segment Reporting Information
Operating revenues	526	638	1,591	1,170
Depreciation and amortization	27	26	49	53
Income/(loss) before income taxes	(14)	35	51	(46)
Net income/(loss)	(14)	35	51	(46)
Total assets	3,422		3,422		2,963
Non-affiliate
Segment Reporting Information
Operating revenues	561	716	1,587	1,140
Non-affiliate | GenOn Americas Generation
Segment Reporting Information
Operating revenues	499	666	1,456	1,065
Affiliate
Segment Reporting Information
Operating revenues	(3)	9	21	15
Affiliate | GenOn Americas Generation
Segment Reporting Information
Operating revenues	$ 27	$ (28)	$ 135	$ 105

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Basis of Presentation

6 Months Ended

Jun. 30, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation (GenOn, GenOn Americas Generation, 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 approximately 19,583 MW of net electric generating capacity located in the U.S.

GenOn Americas Generation is a wholesale power generator with approximately 7,596 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 19,583 MW of net electric generating capacity of GenOn.

GenOn Mid-Atlantic operates and owns or leases 4,683 MW of net electric generating capacity in Maryland near Washington, D.C. GenOn Mid-Atlantic’s electric generating capacity is part of the 7,596 MW of net electric generating capacity of GenOn Americas Generation. GenOn Mid-Atlantic’s generating facilities 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 a wholly-owned subsidiary of NRG North America and 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.

On December 14, 2012, NRG completed the acquisition of GenOn, referred to herein as the NRG Merger.

This is a combined quarterly report of the Registrants for the quarter ended June 30, 2014. 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 U.S. GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the Registrants' financial statements set forth in the 2013 Form 10-K. Interim results are not necessarily indicative of results for a full year.

In the opinion of management, the accompanying unaudited interim 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 June 30, 2014, the results of operations, comprehensive income/(loss) and cash flows for the three months and six months ended June 30, 2014 and 2013.

Use of Estimates

The preparation of financial statements in conformity with U.S. 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. Certain prior period depreciation amounts have been recast to revise provisional purchase accounting estimates for the NRG Merger.

Reclassifications

Certain prior-year amounts have been reclassified for comparative purposes.  The reclassification did not affect results from operations.

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income tax provision
Income/(loss) before income taxes	$ (24)	$ 70	$ (20)	$ (170)
Income tax (benefit)/expense	1	(6)	2	(6)
Effective tax rate (as a percent)	(4.00%)	(8.57%)	0.00%	3.53%
Statutory tax rate (as a percent)	35.00%	35.00%	35.00%	35.00%
GenOn Americas Generation [Member]
Income tax provision
Income tax (benefit)/expense	0	0	0	0
GenOn Mid-Atlantic
Income tax provision
Income/(loss) before income taxes	4	59	47	(17)
Income tax (benefit)/expense	0	0	0	0
GenOn Americas Generation
Income tax provision
Income/(loss) before income taxes	(14)	35	51	(46)
Income tax (benefit)/expense	0	0	0	0
Pro Forma | GenOn Americas Generation [Member]
Income tax provision
Income tax (benefit)/expense	0	0		0
Pro Forma | GenOn Mid-Atlantic
Income tax provision
Income tax (benefit)/expense	2	23	17	4
Deferred income taxes	$ 125		$ 125		$ 141

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating Revenues
Total operating revenues	$ 558	$ 725	$ 1,608	$ 1,155
Operating Costs and Expenses
Depreciation and amortization	58	71	120	137
Acquisition-related transaction and integration costs	1	22	2	41
Total operating costs and expenses	532	588	1,523	1,213
Gain (loss) on sale of assets	0	0	(6)	0
Operating Income/(Loss)	26	137	79	(58)
Other Income/(Expense)
Other income/(expense), net	1	0	2	2
Gains (Losses) on Extinguishment of Debt	0	(11)	0	(11)
Total other income (expense), net	(50)	(67)	(99)	(112)
Income/(Loss) Before Income Taxes	(24)	70	(20)	(170)
Income tax expense/(benefit)	1	(6)	2	(6)
Net Income/(Loss)	(25)	76	(22)	(164)
GenOn Americas Generation
Operating Revenues
Total operating revenues	526	638	1,591	1,170
Operating Costs and Expenses
Depreciation and amortization	27	26	49	53
Total operating costs and expenses	522	585	1,497	1,180
Gain (loss) on sale of assets	0	0	(6)	0
Operating Income/(Loss)	4	53	88	(10)
Other Income/(Expense)
Total other income (expense), net	(18)	(18)	(37)	(36)
Income/(Loss) Before Income Taxes	(14)	35	51	(46)
Income tax expense/(benefit)	0	0	0	0
Net Income/(Loss)	(14)	35	51	(46)
GenOn Mid-Atlantic
Operating Revenues
Total operating revenues	196	243	523	341
Operating Costs and Expenses
Depreciation and amortization	24	19	43	38
Total operating costs and expenses	190	183	473	356
Operating Income/(Loss)	6	60	50	(15)
Other Income/(Expense)
Total other income (expense), net	(2)	(1)	(3)	(2)
Income/(Loss) Before Income Taxes	4	59	47	(17)
Income tax expense/(benefit)	0	0	0	0
Net Income/(Loss)	4	59	47	(17)
Non-affiliate
Operating Revenues
Total operating revenues	561	716	1,587	1,140
Operating Costs and Expenses
Cost of operations	381	285	1,003	635
Selling, general and administrative	23	21	41	54
Other Income/(Expense)
Interest expense	(47)	53	(94)	97
Non-affiliate | GenOn Americas Generation
Operating Revenues
Total operating revenues	499	666	1,456	1,065
Operating Costs and Expenses
Cost of operations	184	160	555	379
Selling, general and administrative	3	1	5	2
Other Income/(Expense)
Interest expense	(16)	17	(33)	33
Non-affiliate | GenOn Mid-Atlantic
Operating Revenues
Total operating revenues	(5)	46	(156)	6
Operating Costs and Expenses
Cost of operations	160	57	394	108
Other Income/(Expense)
Interest expense	(1)	0	1	0
Affiliate
Operating Revenues
Total operating revenues	(3)	9	21	15
Operating Costs and Expenses
Cost of operations	36	170	291	310
Selling, general and administrative	33	19	66	36
Other Income/(Expense)
Interest expense	(4)	3	(7)	6
Affiliate | GenOn Americas Generation
Operating Revenues
Total operating revenues	27	(28)	135	105
Operating Costs and Expenses
Cost of operations	284	376	846	704
Selling, general and administrative	24	22	42	42
Other Income/(Expense)
Interest expense	(2)	1	(4)	3
Affiliate | GenOn Mid-Atlantic
Operating Revenues
Total operating revenues	201	197	679	335
Operating Costs and Expenses
Cost of operations	(14)	90	1	177
Selling, general and administrative	20	17	35	33
Other Income/(Expense)
Interest expense	$ (1)	$ 1	$ 2	$ 2

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, plant and equipment, accumulated depreciation	$ 365	$ 248
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
Intangible assets, accumulated amortization	45	34
GenOn Americas Generation
Property, plant and equipment, accumulated depreciation	0	96
Intangible assets, accumulated amortization	23	34
GenOn Mid-Atlantic
Property, plant and equipment, accumulated depreciation	0	77
Intangible assets, accumulated amortization	$ 0	$ 0

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Environmental Matters (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Environmental Matters Disclosure
Estimated environmental capital expenditures from 2013 through 2017	$ 123
GenOn Americas Generation
Environmental Matters Disclosure
Estimated environmental capital expenditures from 2013 through 2017	13
GenOn Mid-Atlantic
Environmental Matters Disclosure
Estimated environmental capital expenditures from 2013 through 2017	$ 8

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Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2014

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 June 30,					Six months ended June 30,
	2014			2013		2014		2013
	(In millions)
Allocated costs:
Cost of operations — affiliate	(1		)	1		1		5
Selling, general and administrative — affiliate	24			22		42		42
Total	$	23		$	23	$	43	$	47

GenOn Mid-Atlantic

Related Party Transaction

Summary of material related-party transactions with affiliates

GenOn Mid-Atlantic

	Three months ended June 30,					Six months ended June 30,
	2014			2013		2014		2013
	(In millions)
Allocated costs:
Cost of operations — affiliate	(1		)	—		—		3
Selling, general and administrative — affiliate	20			17		35		33
Total	$	19		$	17	$	35	$	36

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Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Carrying Amount
Fair Value of Financial Instruments
Long-term debt	$ 3,132	$ 3,120
Fair Value
Fair Value of Financial Instruments
Long-term debt	3,015	3,058
GenOn Americas Generation | Carrying Amount
Fair Value of Financial Instruments
Long-term debt	933	938
GenOn Americas Generation | Fair Value
Fair Value of Financial Instruments
Long-term debt	$ 874	$ 883

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities
Net income/(loss)	$ (22)	$ (164)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	120	137
Amortization of Financing Costs and Discounts	(29)	(43)
Amortization of out-of-market contracts and emission allowances	(17)	(36)
Share-based Compensation		7
Gains Losses on Extinguishment of Debt, Non Cash Portion		(28)
Loss on sale of asset	6	1
Changes in derivative instruments	327	159
Changes in collateral deposits supporting energy risk management activities	161	(99)
Changes in other working capital	(234)	(22)
Net Cash Provided by Operating Activities	(10)	110
Cash Flows from Investing Activities:
Capital expenditures	(97)	(190)
Decrease in restricted cash, net		(16)
Purchase of emission allowances, net of proceeds	0	(14)
Proceeds from sale of assets, net of cash disposed of	50	1
Payments for (Proceeds from) Other Investing Activities	5	0
Net Cash Provided/(Used) by Investing Activities	(42)	(219)
Cash Flows from Financing Activities
Proceeds from issuance of long-term debt	0	110
Payments for short and long-term debt	0	(578)
Net Cash Provided by Financing Activities		(468)
Net Increase in Cash and Cash Equivalents	(52)	(577)
Cash and Cash Equivalents at Beginning of Period	760	825
Cash and Cash Equivalents at Beginning of Period	708	248
GenOn Americas Generation
Cash Flows from Operating Activities
Net income/(loss)	51	(46)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	49	53
Amortization of Debt Discount (Premium)	(4)	(4)
Amortization of out-of-market contracts and emission allowances	(3)	(12)
Loss on sale of asset	6	4
Changes in derivative instruments	224	122
Changes in collateral deposits supporting energy risk management activities	218	(48)
Changes in other working capital	43	(51)
Net Cash Provided by Operating Activities	148	114
Cash Flows from Investing Activities:
Capital expenditures	(17)	(35)
Purchase of emission allowances, net of proceeds		(14)
Proceeds from sale of assets, net of cash disposed of	50	0
Net Cash Provided/(Used) by Investing Activities	143	(152)
Cash Flows from Financing Activities
Payments for short and long-term debt		(2)
Net Cash Provided by Financing Activities	(320)	(35)
Net Increase in Cash and Cash Equivalents	(29)	(73)
Cash and Cash Equivalents at Beginning of Period	63	148
Cash and Cash Equivalents at Beginning of Period	34	75
GenOn Mid-Atlantic
Cash Flows from Operating Activities
Net income/(loss)	47	(17)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	43	38
Amortization of out-of-market contracts and emission allowances	(6)	(12)
Loss on sale of asset		4
Changes in derivative instruments	228	121
Changes in collateral deposits supporting energy risk management activities		(18)
Changes in other working capital	(12)	(112)
Net Cash Provided by Operating Activities	300	40
Cash Flows from Investing Activities:
Capital expenditures	(9)	(30)
Net Cash Provided/(Used) by Investing Activities	(9)	(30)
Cash Flows from Financing Activities
Payments for short and long-term debt		(2)
Net Cash Provided by Financing Activities	(320)	(70)
Net Increase in Cash and Cash Equivalents	(29)	(60)
Cash and Cash Equivalents at Beginning of Period	64	135
Cash and Cash Equivalents at Beginning of Period	35	75
Affiliate | GenOn Americas Generation
Cash Flows from Investing Activities:
Decrease in note receivable — affiliate	110	(103)
Cash Flows from Financing Activities
Proceeds from Contributions from Affiliates		37
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid	(320)	(70)
Affiliate | GenOn Mid-Atlantic
Cash Flows from Financing Activities
Proceeds from Contributions from Affiliates	0	2
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid	$ (320)	$ (70)

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income/(loss)	$ (25)	$ 76	$ (22)	$ (164)
Other comprehensive income net of reclassifications, net of tax of $0:
Unrealized gain/(loss) on derivatives	0	16	0	17
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	8	29	8	30
Other comprehensive income/(loss)	8	45	8	47
Comprehensive income/(loss)	$ (17)	$ 121	$ (14)	$ (117)

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Basis of Presentation Reclassification (Policies)

6 Months Ended

Jun. 30, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Reclassification, Policy [Policy Text Block]

Reclassifications

Certain prior-year amounts have been reclassified for comparative purposes.  The reclassification did not affect results from operations.

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Document and Entity Information	6 Months Ended
	Jun. 30, 2014
Document and Entity Information [Line Items]
Entity Registrant Name	GenOn Energy, Inc.
Entity Central Index Key	0001126294
Document Type	10-Q
Document Period End Date	Jun. 30, 2014
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding	1
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes
GenOn Americas Generation
Document and Entity Information [Line Items]
Entity Registrant Name	GenOn Americas Generation, LCC
Entity Central Index Key	0001140761
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding	0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes
GenOn Mid-Atlantic
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	2014
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding	0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes

XML

Basis of Presentation Use of Estimates (Policies)

6 Months Ended

Jun. 30, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

The preparation of financial statements in conformity with U.S. 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. Certain prior period depreciation amounts have been recast to revise provisional purchase accounting estimates for the NRG Merger.

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other comprehensive income/(loss), tax	$ 0	$ 0	$ 0	$ 0

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Income Taxes

6 Months Ended

Jun. 30, 2014

Income Tax Disclosure [Abstract]

Income Taxes (GenOn, GenOn Americas Generation, GenOn Mid-Atlantic)

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

GenOn

GenOn’s income tax expense/(benefit) consisted of the following:

	Three months ended June 30,				Six months ended June 30,
(In millions except otherwise noted)	2014		2013		2014		2013
(Loss)/income before income taxes	(24	)	70		(20	)	(170	)
Income tax expense/(benefit)	1		(6	)	2		(6	)
Effective tax rate	(4.2	)%	(8.6	)%	(10.0	)%	3.5	%

GenOn

For the three and six months ended June 30, 2014, GenOn's overall effective tax rate was lower than the statutory rate of 35% primarily due to a change in the valuation allowance and the impact of state income taxes. For the three and six months ended June 30, 2013, GenOn's overall effective tax rate was lower than the statutory rate of 35% primarily due to a change in the valuation allowance. Through June 30, 2014, GenOn recorded income tax expense relating to state income tax payments.

GenOn Americas Generation

GenOn Americas Generation's allocated income taxes resulting from its operations for the three and six months ended June 30,2014 and 2013 were $0 as the income tax expense relates to state income tax payments attributable to its parent, GenOn. GenOn Americas Generation's pro forma income taxes resulting from its operations for the three and six months ended June 30,2014 and 2013 are $0 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 are $0 for the three and six months ended June 30,2014 and 2013 as the income tax expense relates to state income tax payments attributable to its parent, GenOn. The pro forma income tax provision attributable to income before taxes is a tax expense of $2 million and tax expense of $23 million during the three months ended June 30, 2014 and 2013, respectively. The pro forma income tax provision attributable to income before taxes is a tax expense of $17 million during the six months ended June 30, 2014. The pro forma income tax provision attributable to losses before taxes is a tax benefit of $4 million during the six months ended June 30, 2013. The balance of GenOn Mid-Atlantic's pro forma deferred income taxes is a net deferred tax asset of $125 million and $141 million as of June 30, 2014 and December 31, 2013, respectively.

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Accounting for Derivative Instruments and Hedging Activities

6 Months Ended

Jun. 30, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Accounting for Derivative Instruments and Hedging Activities (GenOn, GenOn Americas Generation, 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' 2013 Form 10-K.

Energy-Related Commodities(GenOn)

As of June 30, 2014, GenOn had energy-related derivative financial instruments extending through 2017.

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 June 30, 2014 and December 31, 2013. 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 June 30, 2014		As of December 31, 2013	As of June 30, 2014		As of December 31, 2013	As of June 30, 2014		As of December 31, 2013
Commodity	Units	(In millions)
Coal	Short Ton	11		6	9		4	9		4
Natural Gas	MMBtu	(83	)	(111)	(89	)	(113)	(94	)	(119)
Power	MWh	(36	)	(26)	(18	)	(14)	(17	)	(14)

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
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	594	$	469	$	547	$	163
Commodity contracts long-term	172		182		76		18
Total Derivatives Not Designated as Cash Flow Hedges	$	766	$	651	$	623	$	181

GenOn Americas Generation

	Fair Value
	Derivative Assets				Derivative Liabilities
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	995	$	546	$	890	$	267
Commodity contracts long-term	232		189		134		41
Total Derivatives Not Designated as Cash Flow Hedges	$	1,227	$	735	$	1,024	$	308

GenOn Mid-Atlantic

	Fair Value
	Derivative Assets				Derivative Liabilities
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	239	$	351	$	130	$	64
Commodity contracts long-term	113		156		16		9
Total Derivatives Not Designated as Cash Flow Hedges	$	352	$	507	$	146	$	73

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	756		$	(557	)	$	—	$	199
Derivative assets - affiliate	10			(10		)	—		—
Derivative liabilities	(607		)	557			40		(10		)
Derivative liabilities - affiliate	(16		)	10			—		(6		)
Total derivative instruments	$	143		$	—		$	40	$	183

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	756		$	(557	)	$	—	$	199
Derivative assets - affiliate	471			(417		)	—		54
Derivative liabilities	(607		)	557			40		(10		)
Derivative liabilities - affiliate	(417		)	417			—		—
Total derivative instruments	$	203		$	—		$	40	$	243

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	195		$	(20	)	$	—	$	175
Derivative assets - affiliate	157			(124		)	—		33
Derivative liabilities	(22		)	20			—		(2		)
Derivative liabilities - affiliate	(124		)	124			—		—
Total derivative instruments	$	206		$	—		$	—	$	206

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	645		$	(154	)	$	(56	)	$	435
Derivative assets - affiliate	6			(3		)	—			3
Derivative liabilities	(178		)	154			—			(24		)
Derivative liabilities - affiliate	(3		)	3			—			—
Total derivative instruments	$	470		$	—		$	(56	)	$	414

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	643		$	(154	)	$	(56	)	$	433
Derivative assets - affiliate	92			(92		)	—			—
Derivative liabilities	(178		)	154			—			(24		)
Derivative liabilities - affiliate	(130		)	92			—			(38		)
Total derivative instruments	$	427		$	—		$	(56	)	$	371

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	358		$	—		$	—	$	358
Derivative assets - affiliate	149			(73		)	—		76
Derivative liabilities	—			—			—		—
Derivative liabilities - affiliate	(73		)	73			—		—
Total derivative instruments	$	434		$	—		$	—	$	434

Accumulated Other Comprehensive Income (GenOn)

The following table summarizes the effects on GenOn's accumulated OCI balance attributable to cash flow hedge derivatives:

	Three months ended June 30,					Six months ended June 30,
(In millions)	2014		2013			2014		2013
Accumulated OCI balance, beginning of period	$	—	$	2		$	—	$	1
Recognized in OCI on interest rate derivatives	—		17			—		19
Reclassified from accumulated OCI into earnings(a)(b)	—		(1		)	—		(2		)
Accumulated OCI balance, end of period	$	—	$	18		$	—	$	18

(a) Amounts reclassified from accumulated OCI into income and amounts recognized in income from the ineffective portion of cash flow hedges are recorded in interest expense.

(b) All of the forecasted transactions (future interest payments) were deemed probable of occurring; therefore, no cash flow hedges were discontinued and no amount was recognized in GenOn’s results of operations as a result of discontinued cash flow hedges.

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 not accounted for as cash flow hedges are reflected in current period earnings.

The following tables summarize the pre-tax effects of economic hedges that have not been designated as cash flow hedges and trading activity on the Registrants’ statements of operations. These amounts are included within operating revenues and cost of operations.

GenOn

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(91	)	$	(99	)	$	(151	)	$	(197	)
Net unrealized gains/(losses) on open positions related to economic hedges	2			161			(169		)	38
Total unrealized mark-to-market (losses)/gains for economic hedging activities	(89		)	62			(320		)	(159		)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity	—			1			(1		)	(2		)
Net unrealized gains on open positions related to trading activity	—			—			—			2
Total unrealized mark-to-market gains/(losses) for trading activity	—			1			(1		)	—
Total unrealized (losses)/gains	$	(89	)	$	63		$	(321	)	$	(159	)

	Three months ended June 30,					Six months ended June 30,
(In millions)	2014			2013		2014			2013
Revenue from operations — energy commodities	$	(119	)	$	45	$	(344	)	$	(190	)
Cost of operations	30			18		23			31
Total impact to statements of operations	$	(89	)	$	63	$	(321	)	$	(159	)

GenOn Americas Generation

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(79	)	$	(75	)	$	(136	)	$	(149	)
Net unrealized gains/(losses) on open positions related to economic hedges	8			86			(85		)	26
Total unrealized mark-to-market (losses)/gains for economic hedging activities	(71		)	11			(221		)	(123		)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity	—			1			(1		)	(2		)
Net unrealized gains on open positions related to trading activity	—			—			—			2
Total unrealized mark-to-market gains/(losses) for trading activity	—			1			(1		)	—
Total unrealized (losses)/gains	$	(71	)	$	12		$	(222	)	$	(123	)

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Revenue from operations — energy commodities	$	(94	)	$	(2	)	$	(239	)	$	(153	)
Cost of operations	23			14			17			30
Total impact to statements of operations	$	(71	)	$	12		$	(222	)	$	(123	)

GenOn Mid-Atlantic

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(77	)	$	(76	)	$	(140	)	$	(150	)
Net unrealized gains/(losses) on open positions related to economic hedges	7			86			(85		)	28
Total unrealized (losses)/gains	$	(70	)	$	10		$	(225	)	$	(122	)

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Revenue from operations — energy commodities	$	(93	)	$	(4	)	$	(243	)	$	(152	)
Cost of operations	23			14			18			30
Total impact to statements of operations	$	(70	)	$	10		$	(225	)	$	(122	)

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 June 30, 2014 was $18 million for GenOn and GenOn Americas Generation. The collateral required for contracts with credit rating contingent features that are in a net liability position as of June 30, 2014, was $2 million for GenOn and GenOn Americas Generation. In addition, GenOn and GenOn Americas Generation are parties to certain marginable agreements under which they have net liability positions, but the counterparties have not called for collateral due, which is approximately $3 million for GenOn and GenOn Americas Generation as of June 30, 2014. As of June 30, 2014, GenOn Mid-Atlantic is party to certain marginable agreements under which they have net liability positions, but the counterparties have not called for collateral due, which is approximately $2 million for GenOn Mid-Atlantic.

See Note 3, Fair Value of Financial Instruments, for discussion regarding concentration of credit risk.

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Basis of Presentation (Details)	Jun. 30, 2014 MW
Basis of Presentation
Generation capacity (in MW)	19,583
GenOn Mid-Atlantic
Basis of Presentation
Generation capacity (in MW)	4,683
GenOn Americas Generation
Basis of Presentation
Generation capacity (in MW)	7,596

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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value of Financial Instruments

Estimated carrying amounts and fair values of recorded financial instruments not carried at fair market value

GenOn

	As of June 30, 2014				As of December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Long and short-term debt	$	3,132	$	3,015	$	3,120	$	3,058

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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	108	$	646	$	12	$	766
Derivative liabilities:
Commodity contracts	$	19	$	548	$	56	$	623
Other assets (b)	$	21	$	—	$	—	$	21

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

(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, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	141	$	507	$	3	$	651
Derivative liabilities:
Commodity contracts	$	25	$	149	$	7	$	181
Other assets (b)	$	37	$	—	$	—	$	37

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

(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 tables reconcile, for the three and six months ended June 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	(2	)	$	(6	)	$	(4	)	$	17
Total (losses)/gains included in earnings — realized/unrealized	(2		)	4			2			1
Purchases	(41		)	6			(41		)	2
Settlements	—			(1		)	—			(17		)
Transfers into Level 3 (b)	1			—			(1		)	—
Ending balance	$	(44	)	$	3		$	(44	)	$	3
(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 June 30	$	(1	)	$	14		$	(1	)	$	1

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

(b)    Transfers in/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 credit reserves for derivative contract assets

The Registrants' credit reserves were as follows:

	As of June 30, 2014		As of December 31, 2013
	(In millions)
GenOn	$	1	$	1
GenOn Americas Generation	1		1
GenOn Mid-Atlantic	$	1	$	3

Net counterparty credit exposure by industry sector and by counterparty credit quality

GenOn

Category	Net Exposure (a) (% of Total)
Financial institutions	53	%
Utilities, energy merchants, marketers and other	20	%
ISOs	24	%
Coal	3	%
Total as of June 30, 2014	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	98	%
Non-rated	2	%
Total as of June 30, 2014	100	%

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

GenOn Americas Generation

Fair Value of Financial Instruments

Estimated carrying amounts and fair values of recorded financial instruments not carried at fair market value

GenOn Americas Generation

	As of June 30, 2014				As of December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Long and short-term debt	$	933	$	874	$	938	$	883

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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	117	$	1,088	$	22	$	1,227
Derivative liabilities:
Commodity contracts	$	51	$	910	$	63	$	1,024

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

	As of December 31, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	153	$	575	$	7	$	735
Derivative liabilities:
Commodity contracts	$	74	$	226	$	8	$	308

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

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 tables reconcile, for the three and six months ended June 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	(6	)	$	(1	)	$	17
Total (losses)/gains included in earnings — realized/unrealized	(2		)	3			—			(16		)
Purchases	(40		)	6			(40		)	2
Settlements	—			—			—			—
Transfers into Level 3 (b)	1			—			—
Ending balance	$	(41	)	$	3		$	(41	)	$	3
(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 June 30	$	(1	)	$	14		$	(1	)	$	1

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

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

Net counterparty credit exposure by industry sector and by counterparty credit quality

GenOn Americas Generation

Category	Net Exposure (a) (% of Total)
Financial institutions	53	%
Utilities, energy merchants, marketers and other	20	%
ISOs	24	%
Coal	3	%
Total as of June 30, 2014	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	98	%
Non-rated	2	%
Total as of June 30, 2014	100	%

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

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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	74	$	276	$	2	$	352
Derivative liabilities:
Commodity contracts	$	9	$	94	$	43	$	146

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

	As of December 31, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	87	$	420	$	—	$	507
Derivative liabilities:
Commodity contracts	$	13	$	60	$	—	$	73

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

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 tables reconcile, for the three and six months endedJune 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	(6	)	$	—		$	7
Total (losses)/gains included in earnings — realized/unrealized	(1		)	2			(1		)	(7		)
Purchases	(40		)	6			(40		)	2
Ending balance	$	(41	)	$	2		$	(41	)	$	2
(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 June 30	$	(1	)	$	8		$	(1	)	$	1

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

Net counterparty credit exposure by industry sector and by counterparty credit quality

GenOn Mid-Atlantic

Category	Net Exposure (a) (% of Total)
Financial institutions	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	100	%

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

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Regulatory Matters

6 Months Ended

Jun. 30, 2014

Regulatory Matters Disclosure [Abstract]

Regulatory Matters (GenOn, GenOn Americas Generation, 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 19, Regulatory Matters, to the Registrants' 2013 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

Court Rejects FERC’s Jurisdiction Over Demand Response — On May 23, 2014, the U.S. Court of Appeals for the District of Columbia Circuit vacated FERC’s rules (known as Order No. 745) that allow demand response resources to participate in the FERC-jurisdictional energy markets. The Court of Appeals held that the Federal Power Act does not authorize FERC to exercise jurisdiction over demand response and that instead demand response is part of the retail market over which the states have jurisdiction. The specific order being challenged related solely to energy market participation, but this ruling also calls into question whether demand response will be permitted to participate in the capacity markets in the future. FERC has asked the U.S. Court of Appeals for the District of Columbia Circuit to rehear en banc the decision. The eventual outcome of this proceeding could result in refunds of payments made for non-jurisdictional services and resettlement of wholesale markets but it is not possible to estimate the impact on the Registrants at this time.

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Related Party Transactions

6 Months Ended

Jun. 30, 2014

Related Party Transactions [Abstract]

Related Party Transactions (GenOn, GenOn Americas Generaiton, 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 its 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 is 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 are approximately $193 million. NRG charges these fees on a monthly basis, less amounts incurred directly by GenOn. Management has concluded that this method of charging overhead costs is reasonable. For the three and six months endedJune 30, 2014, GenOn recorded costs related to these services of $33 million and $66 million, respectively, as selling, general and administrative — affiliate. For the three and six months endedJune 30, 2013, GenOn recorded costs related to these services of $19 million and $36 million, respectively, as selling, general and administrative — affiliate.

Under the Service 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 June 30,					Six months ended June 30,
	2014			2013		2014		2013
	(In millions)
Allocated costs:
Cost of operations — affiliate	(1		)	1		1		5
Selling, general and administrative — affiliate	24			22		42		42
Total	$	23		$	23	$	43	$	47

GenOn Mid-Atlantic

	Three months ended June 30,					Six months ended June 30,
	2014			2013		2014		2013
	(In millions)
Allocated costs:
Cost of operations — affiliate	(1		)	—		—		3
Selling, general and administrative — affiliate	20			17		35		33
Total	$	19		$	17	$	35	$	36

Credit Agreement with NRG (GenOn)

In connection with the closing of the NRG Merger, GenOn and GenOn Americas entered into a secured intercompany revolving credit agreement with NRG.  This credit agreement provides for a $500 million revolving credit facility, all of which is available for revolving loans and letters of credit. At June 30, 2014 and December 31, 2013, $281 million and $349 million of letters of credit were issued and outstanding under the NRG credit agreement, of which $217 million and $258 million were issued on behalf of GenOn Americas Generation. At June 30, 2014 and December 31, 2013, no loans were outstanding under this credit agreement.  In connection with the executio0n of the agreement, 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 credit agreement has a three year maturity and is payable at maturity, subject to certain exceptions primarily related to asset sales not in the ordinary course of business and borrowings of debt. In addition, the guarantors are restricted from incurring additional liens on their assets. At GenOn's election, the interest rate per year applicable to the loans under the credit agreement will be determined by reference to either (i) the base rate plus 2.50% per year or (ii) the LIBOR rate plus 3.50% per year. In addition, the credit agreement contains customary covenants and events of default.

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 or notes payable — affiliate, as appropriate. The notes are due on demand and accrue interest on the net position, which is payable quarterly, at a rate determined by GenOn Energy Holdings, a wholly-owned subsidiary of GenOn. At June 30, 2014 and December 31, 2013, GenOn Americas Generation had a net current note receivable from GenOn Energy Holdings of $189 million and $299 million, respectively, related to its intercompany cash management program. For the six months endedJune 30, 2014 and 2013, GenOn Americas Generation earned an insignificant amount of net interest income related to these notes.

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

In May 2014, GenOn Mid-Atlantic made a distribution of $320 million to its parent, NRG North America LLC, who in turn made a distribution of $320 million to its parent, GenOn Americas Generation. GenOn Americas Generation subsequently made a distribution to GenOn in the same amount, through its parent companies NRG Americas, Inc. and GenOn Energy Holdings, Inc.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies (GenOn, GenOn Americas Generation, 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 18, Commitments and Contingencies, to the Registrants' 2013 Form 10-K.

Contingencies

Set forth below is a description of the Registrants’ material legal proceedings. 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. 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 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.

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.  In March 2012, the Court of Appeals reversed the District Court's dismissal and reinstated MC Asset Recovery's amended complaint against the Commerzbank Defendants.  If MC Asset Recovery succeeds in obtaining any recoveries from the Commerzbank Defendants, the Commerzbank Defendants have asserted that they will seek to file claims in Mirant's bankruptcy proceedings for the amount of those recoveries.  GenOn Energy Holdings would vigorously contest the allowance of any such claims. If the Commerzbank Defendants were to receive an allowed claim as a result of a recovery by MC Asset Recovery on its claims against them, GenOn Energy Holdings would retain from the net amount recovered by MC Asset Recovery an amount equal to the dollar amount of the resulting allowed claim.

Pending 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 antitrust 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 is 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. The Court of Appeals reversed the decision of the District Court. On August 26, 2013, 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 Court of Appeal's decision. On July 1, 2014, the U.S. Supreme Court granted the petition for a writ of certiorari.

In September 2012, the State of Nevada Supreme Court, which is 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. GenOn has agreed to indemnify CenterPoint against certain losses relating to these lawsuits.

Cheswick Class Action Complaint (GenOn)

In April 2012, a putative class action lawsuit was filed against GenOn in the Court of Common Pleas of Allegheny County, Pennsylvania alleging that emissions from the Cheswick generating facility have damaged the property of neighboring residents.  GenOn disputes these allegations.  Plaintiffs have brought nuisance, negligence, trespass and strict liability claims seeking both damages and injunctive relief.  Plaintiffs seek to certify a class that consists of people who own property or live within one mile of the plant. In July 2012, GenOn removed the lawsuit to the U.S. District Court for the Western District of Pennsylvania. In October 2012, the court granted GenOn’s motion to dismiss, which Plaintiffs appealed to the U.S. Court of Appeals for the Third Circuit. On August 20, 2013, the Court of Appeals reversed the decision of the District Court. On September 3, 2013, GenOn filed a petition for rehearing with the Court of Appeals which was subsequently denied. In February 2014, NRG filed a petition for a writ of certiorari to the U.S. Supreme Court seeking review and reversal of the Court of Appeals decision. On June 2, 2014, the U.S. Supreme Court denied the petition for a writ of certiorari. The case is proceeding in the U.S. District Court for the Western District of Pennsylvania.

Cheswick Monarch Mine NOV(GenOn)

In 2008, the PADEP issued an NOV related to the Monarch mine located near the Cheswick generating facility. It has not been mined for many years. GenOn uses the Monarch mine for disposal of low-volume wastewater from the Cheswick generating facility and for disposal of leachate collected from ash disposal facilities. The NOV addresses the alleged requirement to maintain a minimum pumping volume from the mine. The PADEP indicated it will seek a civil penalty of approximately $200,000. GenOn contests the allegations in the NOV and has not agreed to such penalty. GenOn is currently planning capital expenditures in connection with wastewater from Cheswick and leachate from ash disposal facilities.

Maryland Department of the Environment v. GenOn Chalk Point and GenOn Mid-Atlantic

On January 25, 2013, Food & Water Watch, the Patuxent Riverkeeper and the Potomac Riverkeeper (together, the Citizens Group) sent GenOn Mid-Atlantic a letter alleging that the Chalk Point, Dickerson and Morgantown generating facilities were violating the terms of the National Pollution Discharge Elimination System permits by discharging nitrogen and phosphorous in excess of the limits in each permit. On March 21, 2013, the MDE sent GenOn Mid-Atlantic a similar letter with respect to the Chalk Point and Dickerson facilities, threatening to sue within 60 days if the facilities were not brought into compliance. On June 11, 2013, the Maryland Attorney General on behalf of the MDE filed a complaint in the U.S. District Court for the District of Maryland alleging violations of the Clean Water Act and Maryland environmental laws related to water. The lawsuit is ongoing and seeks injunctive relief and civil penalties in excess of $100,000.

Chapter 11 Proceedings (GenOn and GenOn Americas Generation)

In July 2003, and various dates thereafter, the Mirant Debtors filed voluntary petitions in the Bankruptcy Court for relief under Chapter 11 of the U.S. Bankruptcy Code. GenOn Energy Holdings and most of the other Mirant Debtors emerged from bankruptcy on January 3, 2006, when the 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 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 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.

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Environmental Matters

6 Months Ended

Jun. 30, 2014

Environmental Matters Disclosure [Abstract]

Environmental Matters (GenOn, GenOn Americas Generation, 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 20, Environmental Matters, to the Registrants' 2013 Form 10-K.

The Registrants are subject to a wide range of environmental laws in the development, ownership, construction and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and during operation of power plants. Environmental laws have become increasingly stringent and the Registrants expect this trend to continue. The electric generation industry is likely to face new requirements to address various emissions, including greenhouse gases, as well as combustion byproducts, water discharge and use, and threatened and endangered species. 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' operations.

The EPA released CSAPR in 2011, which was scheduled to replace CAIR in January 2012. In December 2011, the U.S. Court of Appeals for the District of Columbia Circuit stayed the implementation of CSAPR and then issued an opinion in August 2012 vacating CSAPR and keeping CAIR in place until the EPA can replace it. On April 29, 2014, the U.S. Supreme Court reversed and remanded the D.C. Circuit's opinion. The Company expects further proceedings in the Court of Appeals over the next few months. While NRG is unable to predict the final outcome of the ongoing litigation, the Company believes its investment in pollution controls and cleaner technologies coupled with planned plant retirements should leave the fleet well positioned for compliance. [Update for D.C. Circuit proceedings end of July 2014.]

In January 2014, EPA re-proposed the NSPS for CO₂ emissions from new fossil-fuel-fired electric generating units that had been previously proposed in April 2012. The re-proposed standards are 1,000 pounds of CO₂ per MWh for large gas units and 1,100 pounds of CO₂ per MWh for coal units and small gas units. Proposed standards are in effect until a final rule is published or another rule is re-proposed. On June 18, 2014, the EPA proposed a rule that would require states to develop CO₂ emission standards that would apply to existing fossil-fueled generating facilities. Specifically, the EPA proposed state-specific rate-based standards for CO₂ emissions, as well as guidelines for states to follow in developing plans to achieve the state-specific standards. The EPA anticipates finalizing this rule in June 2015.

Water

On [July XX, 2014,] [HAS NOT YET BEEN PUBLISHED IN FEDERAL REGISTER] the EPA finalized regulations regarding once through cooling from existing facilities to address impingement and entrainment concerns. The Registrants anticipate that more stringent requirements will be incorporated into their water discharge permits over the next several years.

East Region

The MDE has announced that it intends to promulgate more stringent regulations regarding SO₂ and NO_x emissions, which could negatively affect certain of the Registrants' coal facilities located in Maryland.

Environmental Capital Expenditures

Based on current rules, technology and preliminary plans based on some proposed rules, GenOn estimates that environmental capital expenditures from 2014 through 2018 required to comply with regulatory environmental laws will be approximately $123 million for GenOn, which includes $13 million for GenOn Americas Generation, which was adjusted for the sale of Kendall on January 31, 2014. The amount for GenOn Americas Generation includes $8 million for GenOn Mid-Atlantic.

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Commitments and Contingencies (Details) (USD $)	1 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Jun. 30, 2013 GenOn Energy [Member] legal_cases	Jun. 30, 2014 GenOn Energy [Member] lawsuit	Apr. 30, 2012 Cheswick Class Action Complaint Environmental Matters	Dec. 31, 2008 Cheswick Monarch Mine NOV Environmental Matters	Jan. 31, 2013 MDE v. GenOn Chalk Point and GenOn Mid-Atlantic GenOn Mid-Atlantic Environmental Matters	Dec. 31, 2008 MDE v. GenOn Chalk Point and GenOn Mid-Atlantic GenOn Mid-Atlantic Environmental Matters	Mar. 31, 2014 Chapter Eleven Proceedings GenOn Americas Generation Bankruptcy	Dec. 14, 2012 Chapter Eleven Proceedings GenOn Americas Generation Bankruptcy	Dec. 02, 2010 Chapter Eleven Proceedings GenOn Americas Generation Bankruptcy	Jun. 30, 2014 U.S. District Court for the District of Nevada [Member] GenOn Energy [Member] Lawsuits
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		5								4
Loss Contingency, Claims Settled and Dismissed, Number	1
Cheswick Class Action Complaint
Maximum Distance from Plant Class Action Plaintiffs Live Work			1
Loss Contingency, Damages Sought, Value				$ 200,000		$ 100,000
Maryland Department of the Environment v. GenOn Chalk Point and GenOn Mid-Atlantic
Days to Comply					60 days
Chapter Eleven Proceedings
GenOn Energy Holdings common stock shares reserved for unresolved claims							461,000
Number of reserved shares for disputed Chapter 11 claims converted into reserved of GenOn common stock									1,300,000
Number of reserved shares for disputed Chapter 11 claims converted into reserved of NRG common stock								159,000

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2014

Income Tax Disclosure [Abstract]

Income tax (benefit)/provision

GenOn’s income tax expense/(benefit) consisted of the following:

	Three months ended June 30,				Six months ended June 30,
(In millions except otherwise noted)	2014		2013		2014		2013
(Loss)/income before income taxes	(24	)	70		(20	)	(170	)
Income tax expense/(benefit)	1		(6	)	2		(6	)
Effective tax rate	(4.2	)%	(8.6	)%	(10.0	)%	3.5	%

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Fair Value of Financial Instruments (Details 3) (Fair Value, Inputs, Level 3 [Member], Derivative [Member], USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013		Dec. 31, 2012
Fair Value Asset and Liabilities, Measured on Recurring Basis, Unobservable Input Changes
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability Transfers into Level 3	$ 1	[1],[2]	$ 0	[1],[2]	$ (1)	[1],[2]	$ 0	[1],[2]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(1)	[2]	14	[2]	(1)	[2]	1	[2]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	(44)	[2]	3	[2]	(44)	[2]	3	[2]	(2)	[2]	(4)	[2]	(6)	[2]	17	[2]
Reconciliation of the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements
Total gains and losses (realized/unrealized) included in earnings	(2)	[2]	4	[2]	2	[2]	1	[2]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	(41)	[2]	6	[2]	(41)	[2]	2	[2]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements	0	[2]	(1)	[2]	0	[2]	(17)	[2]
GenOn Americas Generation
Fair Value Asset and Liabilities, Measured on Recurring Basis, Unobservable Input Changes
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability Transfers into Level 3	1	[2],[3]	0	[2],[3]	0	[2],[3]		[2],[3]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(1)	[2]	14	[2]	(1)	[2]	1	[2]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	(41)	[2]	3	[2]	(41)	[2]	3	[2]	0	[2]	(1)	[2]	(6)	[2]	17	[2]
Reconciliation of the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements
Total gains and losses (realized/unrealized) included in earnings	(2)	[2]	3	[2]	0	[2]	(16)	[2]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	(40)	[2]	6	[2]	(40)	[2]	2	[2]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements	0	[2]	0	[2]	0	[2]	0	[2]
GenOn Mid-Atlantic
Fair Value Asset and Liabilities, Measured on Recurring Basis, Unobservable Input Changes
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(1)	[4]	8	[4]	(1)	[4]	1	[4]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	(41)	[4]	2	[4]	(41)	[4]	2	[4]	0	[4]	0	[4]	(6)	[4]	7	[4]
Reconciliation of the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements
Total gains and losses (realized/unrealized) included in earnings	(1)	[4]	2	[4]	(1)	[4]	(7)	[4]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases	$ (40)	[4]	$ 6	[4]	$ (40)	[4]	$ 2	[4]

[1] Transfers in/out of level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

[2] Consists of derivative assets and liabilities, net.

[3] (b) Transfers in/out of level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period.

[4] Consists of derivative assets and liabilities, net

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 708	$ 760
Funds deposited by counterparties	0	56
Accounts receivable — trade	121	178
Inventory	409	443
Cash collateral paid in support of energy risk management activities	223	62
Prepayments and other current assets	202	194
Total current assets	2,257	2,162
Property, Plant and Equipment
Property, plant and equipment	3,121	3,176
Other Assets
Intangible assets, net of accumulated amortization	68	65
Other non-current assets	208	149
Assets, Noncurrent	448	396
Total Assets	5,826	5,734
Current Liabilities
Current portion of long-term debt and capital leases	7	5
Cash collateral received in support of energy risk management activities	0	56
Other Accrued Liabilities, Current	219	266
Total current liabilities	924	749
Other Liabilities
Long-term debt and capital leases	3,135	3,128
Out-of-market contracts	1,008	1,045
Other non-current liabilities	382	481
Total non-current liabilities	4,601	4,672
Total Liabilities	5,525	5,421
Commitments and Contingencies
Stockholder's Equity
Common stock: $0.001 par value, 1 share authorized and issued at June 30, 2013 and December 31, 2012	0	0
Additional paid-in capital	325	325
Accumulated deficit	(134)	(114)
Accumulated other comprehensive income	110	102
Total Stockholder's Equity	301	313
Total Liabilities and Stockholder's Equity	5,826	5,734
GenOn Mid-Atlantic
Current Assets
Cash and cash equivalents	35	64
Inventory	129	158
Prepayments and other current assets	71	81
Total current assets	476	693
Property, Plant and Equipment
Property, plant and equipment	950	987
Other Assets
Intangible assets, net of accumulated amortization	10	11
Other non-current assets	95	25
Assets, Noncurrent	218	192
Total Assets	1,644	1,872
Current Liabilities
Current portion of long-term debt and capital leases	5	5
Other Accrued Liabilities, Current	55	49
Total current liabilities	202	134
Other Liabilities
Long-term debt and capital leases	2	5
Out-of-market contracts	560	575
Other non-current liabilities	58	71
Total non-current liabilities	636	660
Total Liabilities	838	794
Commitments and Contingencies
Stockholder's Equity
Total Liabilities and Stockholder's Equity	1,644	1,872
Member's Equity
Members' interest	806	1,078
GenOn Americas Generation
Current Assets
Cash and cash equivalents	34	63
Accounts receivable — trade	103	151
Inventory	229	270
Cash collateral paid in support of energy risk management activities	212	50
Prepayments and other current assets	150	105
Total current assets	1,912	1,484
Property, Plant and Equipment
Property, plant and equipment	1,107	1,194
Other Assets
Intangible assets, net of accumulated amortization	68	64
Other non-current assets	103	32
Assets, Noncurrent	403	285
Total Assets	3,422	2,963
Current Liabilities
Current portion of long-term debt and capital leases	5	5
Cash collateral received in support of energy risk management activities	0	56
Other Accrued Liabilities, Current	99	93
Total current liabilities	1,166	597
Other Liabilities
Long-term debt and capital leases	935	943
Out-of-market contracts	561	575
Other non-current liabilities	103	116
Total non-current liabilities	1,733	1,675
Total Liabilities	2,899	2,272
Commitments and Contingencies
Stockholder's Equity
Total Liabilities and Stockholder's Equity	3,422	2,963
Member's Equity
Members' interest	523	691
Non-affiliate
Current Assets
Derivative instruments	586	464
Other Assets
Derivative instruments	170	181
Current Liabilities
Accounts payable	146	187
Derivative instruments	532	160
Other Liabilities
Derivative instruments	75	18
Non-affiliate | GenOn Mid-Atlantic
Current Assets
Accounts receivable — trade	2	4
Derivative instruments	165	298
Other Assets
Derivative instruments	30	60
Current Liabilities
Accounts payable	15	16
Derivative instruments	22	0
Non-affiliate | GenOn Americas Generation
Current Assets
Derivative instruments	586	462
Other Assets
Derivative instruments	170	181
Current Liabilities
Accounts payable	52	90
Derivative instruments	532	160
Other Liabilities
Derivative instruments	75	18
Affiliate
Current Assets
Derivative instruments	8	5
Other Assets
Derivative instruments	2	1
Current Liabilities
Accounts payable	5	72
Derivative instruments	15	3
Other Liabilities
Derivative instruments	1	0
Affiliate | GenOn Mid-Atlantic
Current Assets
Accounts receivable — trade	0	35
Derivative instruments	74	53
Other Assets
Derivative instruments	83	96
Current Liabilities
Accounts payable	(3)	0
Derivative instruments	108	64
Other Liabilities
Derivative instruments	16	9
Affiliate | GenOn Americas Generation
Current Assets
Notes Receivable, Related Parties, Current	189	299
Derivative instruments	409	84
Other Assets
Derivative instruments	62	8
Current Liabilities
Accounts payable	120	86
Derivative instruments	358	107
Other Liabilities
Derivative instruments	$ 59	$ 23

XML

Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments (GenOn, GenOn Americas Generation, 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' 2013 Form 10-K.

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

The estimated carrying amounts and fair values of GenOn and GenOn Americas Generation’s debt are as follows:

GenOn

	As of June 30, 2014				As of December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Long and short-term debt	$	3,132	$	3,015	$	3,120	$	3,058

The fair value of long and short-term debt that is estimated using reported market prices for instruments that are publicly traded is classified as Level 2 within the fair value hierarchy.

GenOn Americas Generation

	As of June 30, 2014				As of December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Long and short-term debt	$	933	$	874	$	938	$	883

The fair value of long and short-term debt is estimated using reported market prices for instruments that are publicly traded and is classified as Level 2 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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	108	$	646	$	12	$	766
Derivative liabilities:
Commodity contracts	$	19	$	548	$	56	$	623
Other assets (b)	$	21	$	—	$	—	$	21

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

(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, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	141	$	507	$	3	$	651
Derivative liabilities:
Commodity contracts	$	25	$	149	$	7	$	181
Other assets (b)	$	37	$	—	$	—	$	37

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

(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 tables reconcile, for the three and six months ended June 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	(2	)	$	(6	)	$	(4	)	$	17
Total (losses)/gains included in earnings — realized/unrealized	(2		)	4			2			1
Purchases	(41		)	6			(41		)	2
Settlements	—			(1		)	—			(17		)
Transfers into Level 3 (b)	1			—			(1		)	—
Ending balance	$	(44	)	$	3		$	(44	)	$	3
(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 June 30	$	(1	)	$	14		$	(1	)	$	1

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

(b)    Transfers in/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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	117	$	1,088	$	22	$	1,227
Derivative liabilities:
Commodity contracts	$	51	$	910	$	63	$	1,024

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

	As of December 31, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	153	$	575	$	7	$	735
Derivative liabilities:
Commodity contracts	$	74	$	226	$	8	$	308

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

The following tables reconcile, for the three and six months ended June 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	(6	)	$	(1	)	$	17
Total (losses)/gains included in earnings — realized/unrealized	(2		)	3			—			(16		)
Purchases	(40		)	6			(40		)	2
Settlements	—			—			—			—
Transfers into Level 3 (b)	1			—			—
Ending balance	$	(41	)	$	3		$	(41	)	$	3
(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 June 30	$	(1	)	$	14		$	(1	)	$	1

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

(b)    Transfers in/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 June 30, 2014
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	74	$	276	$	2	$	352
Derivative liabilities:
Commodity contracts	$	9	$	94	$	43	$	146

(a) There were no transfers during the three and six months ended June 30, 2014 between Levels 1 and 2.

	As of December 31, 2013
	Fair Value
	Level 1 (a)		Level 2 (a)		Level 3		Total
	(In millions)
Derivative assets:
Commodity contracts	$	87	$	420	$	—	$	507
Derivative liabilities:
Commodity contracts	$	13	$	60	$	—	$	73

(a) There were no transfers during the year ended December 31, 2013 between Levels 1 and 2.

The following tables reconcile, for the three and six months endedJune 30, 2014 and 2013, 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 June 30,						Six months ended June 30,
	2014			2013			2014			2013
	Derivatives (a)						Derivatives (a)
	(In millions)
Beginning balance	$	—		$	(6	)	$	—		$	7
Total (losses)/gains included in earnings — realized/unrealized	(1		)	2			(1		)	(7		)
Purchases	(40		)	6			(40		)	2
Ending balance	$	(41	)	$	2		$	(41	)	$	2
(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 June 30	$	(1	)	$	8		$	(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 June 30, 2014, contracts valued with prices provided by models and other valuation techniques make up 2% of GenOn's derivative assets and 9% of GenOn's derivative liabilities, 2% of GenOn Americas Generation’s derivative assets and 6% of GenOn Americas Generation's derivative liabilities and 1% of GenOn Mid-Atlantic’s derivative assets and 29% of GenOn Mid-Atlantic's derivative liabilities.

The fair value of each contract is discounted using a risk free interest rate. In addition, the Registrants apply a credit reserve to reflect credit risk which is calculated based on published default probabilities. The Registrants' credit reserves were as follows:

	As of June 30, 2014		As of December 31, 2013
	(In millions)
GenOn	$	1	$	1
GenOn Americas Generation	1		1
GenOn Mid-Atlantic	$	1	$	3

Concentration of Credit Risk

In addition to the credit risk discussion as disclosed in Note 2, Summary of Significant Accounting Policies, to the Registrants' 2013 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 2013 Form 10-K. As of June 30, 2014, GenOn's counterparty credit exposure was $338 million and GenOn held collateral (cash and letters of credit) against those positions of $1 million, resulting in a net exposure of $338 million. Approximately 86% of GenOn's exposure before collateral is expected to roll off by the end of 2015. As of June 30, 2014, GenOn Americas Generation’s counterparty credit exposure was $338 million and GenOn Americas Generation held collateral (cash and letters of credit) against those positions of $1 million, resulting in a net exposure of $338 million. Approximately 86% of GenOn Americas Generation’s exposure before collateral is expected to roll off by the end of 2015. As of June 30, 2014, GenOn Mid-Atlantic’s counterparty credit exposure was $174 million and GenOn Mid-Atlantic held no collateral (cash and letters or credit) against those positions, resulting in a net exposure of $174 million. Approximately 100% of GenOn Mid-Atlantic’s exposure before collateral is expected to roll off by the end of 2015. 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.

GenOn

Category	Net Exposure (a) (% of Total)
Financial institutions	53	%
Utilities, energy merchants, marketers and other	20	%
ISOs	24	%
Coal	3	%
Total as of June 30, 2014	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	98	%
Non-rated	2	%
Total as of June 30, 2014	100	%

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

GenOn has counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of the total net exposure discussed above. The aggregate of such counterparties' exposure was $280 million. 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, GenOn does not anticipate a material impact on its financial position or results of operations from nonperformance by any of its counterparties.

GenOn Americas Generation

Category	Net Exposure (a) (% of Total)
Financial institutions	53	%
Utilities, energy merchants, marketers and other	20	%
ISOs	24	%
Coal	3	%
Total as of June 30, 2014	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	98	%
Non-rated	2	%
Total as of June 30, 2014	100	%

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

GenOn Americas Generation has counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of the total net exposure discussed above. The aggregate of such counterparties' exposure was $280 million. 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, GenOn Americas Generation does not anticipate a material impact on its financial position or results of operations from nonperformance by any of its counterparties.

GenOn Mid-Atlantic

Category	Net Exposure (a) (% of Total)
Financial institutions	100	%

Category	Net Exposure (a) (% of Total)
Investment grade	100	%

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

GenOn Mid-Atlantic has counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of the total net exposure discussed above. The aggregate of such counterparties' exposure was $163 million. 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, GenOn Mid-Atlantic does not anticipate a material impact on its financial position or results of operations from nonperformance by any of its counterparties.

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Fair Value of Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013
Derivative Fair Value Measurements and Concentration of Credit Risk
Fair Value Inputs, Counterparty Credit Risk	10.00%
Derivative fair value measurements
Total derivative assets valued with prices provied by models and other valuation techniques (as a percent)	2.00%
Total derivative liabilities valued with prices provied by models and other valuation techniques (as a percent)	9.00%
Credit reserve balance	$ 1		$ 1
Concentration of credit risk
Counterparty credit exposure	338
Collateral held (cash and letters of credit) against counterparty credit exposure	1
Counterparty credit exposure, net	338
Counterparty credit exposure before collateral expected to roll off by the end of 2014 (as a percent)	86.00%
Net exposure (as a percent)	100.00%	[1]
Aggregate counterparty credit risk exposure for counterparties representing exposure above threshold percentage	280
Investment grade
Concentration of credit risk
Net exposure (as a percent)	98.00%	[1]
Non-rated
Concentration of credit risk
Net exposure (as a percent)	2.00%	[1]
Financial institutions
Concentration of credit risk
Net exposure (as a percent)	53.00%	[1]
Utilities, energy merchants, marketers and other
Concentration of credit risk
Net exposure (as a percent)	20.00%	[1]
ISOs
Concentration of credit risk
Net exposure (as a percent)	24.00%	[1]
Coal
Concentration of credit risk
Net exposure (as a percent)	3.00%	[1]
GenOn Americas Generation
Derivative Fair Value Measurements and Concentration of Credit Risk
Fair Value Inputs, Counterparty Credit Risk	10.00%
Derivative fair value measurements
Total derivative assets valued with prices provied by models and other valuation techniques (as a percent)	2.00%
Total derivative liabilities valued with prices provied by models and other valuation techniques (as a percent)	6.00%
Credit reserve balance	1		1
Concentration of credit risk
Counterparty credit exposure	338
Collateral held (cash and letters of credit) against counterparty credit exposure	1
Counterparty credit exposure, net	338
Counterparty credit exposure before collateral expected to roll off by the end of 2014 (as a percent)	86.00%
Net exposure (as a percent)	100.00%	[1]
Aggregate counterparty credit risk exposure for counterparties representing exposure above threshold percentage	280
GenOn Americas Generation | Investment grade
Concentration of credit risk
Net exposure (as a percent)	98.00%	[1]
GenOn Americas Generation | Non-rated
Concentration of credit risk
Net exposure (as a percent)	2.00%	[1]
GenOn Americas Generation | Financial institutions
Concentration of credit risk
Net exposure (as a percent)	53.00%	[1]
GenOn Americas Generation | Utilities, energy merchants, marketers and other
Concentration of credit risk
Net exposure (as a percent)	20.00%	[1]
GenOn Americas Generation | ISOs
Concentration of credit risk
Net exposure (as a percent)	24.00%	[1]
GenOn Americas Generation | Coal
Concentration of credit risk
Net exposure (as a percent)	3.00%	[1]
GenOn Mid-Atlantic
Derivative Fair Value Measurements and Concentration of Credit Risk
Fair Value Inputs, Counterparty Credit Risk	10.00%
Derivative fair value measurements
Total derivative assets valued with prices provied by models and other valuation techniques (as a percent)	1.00%
Total derivative liabilities valued with prices provied by models and other valuation techniques (as a percent)	29.00%
Credit reserve balance	1		3
Concentration of credit risk
Counterparty credit exposure	174
Collateral held (cash and letters of credit) against counterparty credit exposure	0
Counterparty credit exposure, net	174
Counterparty credit exposure before collateral expected to roll off by the end of 2014 (as a percent)	100.00%
Aggregate counterparty credit risk exposure for counterparties representing exposure above threshold percentage	$ 163
GenOn Mid-Atlantic | Investment grade
Concentration of credit risk
Net exposure (as a percent)	100.00%	[1]
GenOn Mid-Atlantic | Financial institutions
Concentration of credit risk
Net exposure (as a percent)	100.00%	[1]

[1] Counterparty credit exposure excludes transportation contracts because of the unavailability of market prices.

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Accounting for Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2014

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 June 30, 2014 and December 31, 2013. 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 June 30, 2014		As of December 31, 2013	As of June 30, 2014		As of December 31, 2013	As of June 30, 2014		As of December 31, 2013
Commodity	Units	(In millions)
Coal	Short Ton	11		6	9		4	9		4
Natural Gas	MMBtu	(83	)	(111)	(89	)	(113)	(94	)	(119)
Power	MWh	(36	)	(26)	(18	)	(14)	(17	)	(14)

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
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	594	$	469	$	547	$	163
Commodity contracts long-term	172		182		76		18
Total Derivatives Not Designated as Cash Flow Hedges	$	766	$	651	$	623	$	181

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	756		$	(557	)	$	—	$	199
Derivative assets - affiliate	10			(10		)	—		—
Derivative liabilities	(607		)	557			40		(10		)
Derivative liabilities - affiliate	(16		)	10			—		(6		)
Total derivative instruments	$	143		$	—		$	40	$	183

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	645		$	(154	)	$	(56	)	$	435
Derivative assets - affiliate	6			(3		)	—			3
Derivative liabilities	(178		)	154			—			(24		)
Derivative liabilities - affiliate	(3		)	3			—			—
Total derivative instruments	$	470		$	—		$	(56	)	$	414

Effects of ASC 815 on accumulated OCI balance attributable to cash flow hedge derivatives, net of tax

The following table summarizes the effects on GenOn's accumulated OCI balance attributable to cash flow hedge derivatives:

	Three months ended June 30,					Six months ended June 30,
(In millions)	2014		2013			2014		2013
Accumulated OCI balance, beginning of period	$	—	$	2		$	—	$	1
Recognized in OCI on interest rate derivatives	—		17			—		19
Reclassified from accumulated OCI into earnings(a)(b)	—		(1		)	—		(2		)
Accumulated OCI balance, end of period	$	—	$	18		$	—	$	18

(a) Amounts reclassified from accumulated OCI into income and amounts recognized in income from the ineffective portion of cash flow hedges are recorded in interest expense.

(b) All of the forecasted transactions (future interest payments) were deemed probable of occurring; therefore, no cash flow hedges were discontinued and no amount was recognized in GenOn’s results of operations as a result of discontinued cash flow hedges

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 that have not been designated as cash flow hedges and trading activity on the Registrants’ statements of operations. These amounts are included within operating revenues and cost of operations.

GenOn

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(91	)	$	(99	)	$	(151	)	$	(197	)
Net unrealized gains/(losses) on open positions related to economic hedges	2			161			(169		)	38
Total unrealized mark-to-market (losses)/gains for economic hedging activities	(89		)	62			(320		)	(159		)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity	—			1			(1		)	(2		)
Net unrealized gains on open positions related to trading activity	—			—			—			2
Total unrealized mark-to-market gains/(losses) for trading activity	—			1			(1		)	—
Total unrealized (losses)/gains	$	(89	)	$	63		$	(321	)	$	(159	)

	Three months ended June 30,					Six months ended June 30,
(In millions)	2014			2013		2014			2013
Revenue from operations — energy commodities	$	(119	)	$	45	$	(344	)	$	(190	)
Cost of operations	30			18		23			31
Total impact to statements of operations	$	(89	)	$	63	$	(321	)	$	(159	)

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
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	995	$	546	$	890	$	267
Commodity contracts long-term	232		189		134		41
Total Derivatives Not Designated as Cash Flow Hedges	$	1,227	$	735	$	1,024	$	308

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	756		$	(557	)	$	—	$	199
Derivative assets - affiliate	471			(417		)	—		54
Derivative liabilities	(607		)	557			40		(10		)
Derivative liabilities - affiliate	(417		)	417			—		—
Total derivative instruments	$	203		$	—		$	40	$	243

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	643		$	(154	)	$	(56	)	$	433
Derivative assets - affiliate	92			(92		)	—			—
Derivative liabilities	(178		)	154			—			(24		)
Derivative liabilities - affiliate	(130		)	92			—			(38		)
Total derivative instruments	$	427		$	—		$	(56	)	$	371

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 June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(79	)	$	(75	)	$	(136	)	$	(149	)
Net unrealized gains/(losses) on open positions related to economic hedges	8			86			(85		)	26
Total unrealized mark-to-market (losses)/gains for economic hedging activities	(71		)	11			(221		)	(123		)
Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity	—			1			(1		)	(2		)
Net unrealized gains on open positions related to trading activity	—			—			—			2
Total unrealized mark-to-market gains/(losses) for trading activity	—			1			(1		)	—
Total unrealized (losses)/gains	$	(71	)	$	12		$	(222	)	$	(123	)

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Revenue from operations — energy commodities	$	(94	)	$	(2	)	$	(239	)	$	(153	)
Cost of operations	23			14			17			30
Total impact to statements of operations	$	(71	)	$	12		$	(222	)	$	(123	)

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
	June 30, 2014		December 31, 2013		June 30, 2014		December 31, 2013
	(In millions)
Derivatives Not Designated as Cash Flow Hedges:
Commodity contracts current	$	239	$	351	$	130	$	64
Commodity contracts long-term	113		156		16		9
Total Derivatives Not Designated as Cash Flow Hedges	$	352	$	507	$	146	$	73

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
June 30, 2014	(In millions)
Commodity contracts:
Derivative assets	$	195		$	(20	)	$	—	$	175
Derivative assets - affiliate	157			(124		)	—		33
Derivative liabilities	(22		)	20			—		(2		)
Derivative liabilities - affiliate	(124		)	124			—		—
Total derivative instruments	$	206		$	—		$	—	$	206

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
December 31, 2013	(In millions)
Commodity contracts:
Derivative assets	$	358		$	—		$	—	$	358
Derivative assets - affiliate	149			(73		)	—		76
Derivative liabilities	—			—			—		—
Derivative liabilities - affiliate	(73		)	73			—		—
Total derivative instruments	$	434		$	—		$	—	$	434

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 June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Unrealized mark-to-market results
Reversal of previously recognized unrealized gains on settled positions related to economic hedges	$	(77	)	$	(76	)	$	(140	)	$	(150	)
Net unrealized gains/(losses) on open positions related to economic hedges	7			86			(85		)	28
Total unrealized (losses)/gains	$	(70	)	$	10		$	(225	)	$	(122	)

	Three months ended June 30,						Six months ended June 30,
(In millions)	2014			2013			2014			2013
Revenue from operations — energy commodities	$	(93	)	$	(4	)	$	(243	)	$	(152	)
Cost of operations	23			14			18			30
Total impact to statements of operations	$	(70	)	$	10		$	(225	)	$	(122	)