Exhibit 99.1

NRG Energy, Inc. Reports Third Quarter and Year-to-Date Results and

Updated Guidance

Financial Highlights

·                  $458 million of adjusted EBITDA in the third quarter of 2011

·                  $1,430 million of adjusted EBITDA in the first nine months of 2011

·                  $1,919 million of total liquidity with $1,568 million in cash

2011 Capital Allocation — Return of Capital to Stakeholders

·                  $378 million worth of common shares repurchased year-to-date (17.5 million shares), leaving $52 million to be completed by year end

·                  $577 million of corporate debt paid down and $7.1 billion of debt refinanced

2011 Capital Allocation - Growth Investments

·                  Acquisition and financial closing of the 250-megawatt (MW) California Valley Solar Ranch (CVSR) project and the 290 MW Agua Caliente project which received, in aggregate, $2.2 billion of Department of Energy (DOE) loan guarantees

·                  Launch of a distributed rooftop solar program through a joint venture with Prologis, which is supported by a DOE commitment to guarantee up to 80% of a $1.4 billion long-term debt facility

·                  Commercial operation achieved on the 45 MW Avenal and the 20 MW Roadrunner solar facilities in California and New Mexico, respectively

·                  Acquisition of Energy Plus Holdings, a retail electricity provider with 180,000 customers, a Northeast concentration and a unique sales channel involving exclusive loyalty and affinity program partnerships

·                  Financial closing of the non-recourse debt facility on the 550 MW El Segundo Repowering Project

Guidance — Narrowed 2011 and Initiated 2012

·                  $1,800-$1,850 million adjusted EBITDA guidance for 2011, with free cash flow before growth investments at a range of $800-$850 million

·                  $1,825-$2,000 million adjusted EBITDA guidance for 2012, with free cash flow before growth investments at a range of $800-$1,000 million

PRINCETON, NJ; November 3, 2011—NRG Energy, Inc. (NYSE: NRG) today reported third quarter 2011 adjusted EBITDA of $458 million split between our wholesale generation business, which contributed $323 million and our NRG retail subsidiary, Reliant Energy, which contributed $135 million. NRG also reported a third quarter 2011 net loss of $55 million, or $0.24 per diluted common share compared to net income of $223 million, or $0.87 per diluted common share, for the third quarter last year. Third quarter net income was impacted by a $160 million impairment charge related to the Company’s acid rain program sulfur dioxide emission allowances following the release of the EPA’s final Cross-State Air Pollution Rule, as well as the challenging Texas market conditions in August, as previously disclosed by NRG.

Adjusted EBITDA for the nine months ended September 30, 2011, was $1,430 million and cash flow from operations was $668 million. Reliant contributed $462 million of adjusted EBITDA while wholesale adjusted EBITDA was $968 million. Year-to-date free cash flow generation, before growth, was $414 million. Net income for the first nine months of 2011 was $306 million, or $1.22 per diluted common share compared to net income of $491 million, or $1.90 per diluted common share, for the first nine months of 2010.

“Both our wholesale and retail businesses got back on track in September, closing out the quarter with year-to-date results which have us approaching the midpoint of our original 2011 guidance,” commented David Crane, NRG’s President and Chief Executive Officer. “And we continued to experience great success during the quarter, and since the end of the quarter, in deploying the Company’s free cash flow and excess cash both in value-enhancing renewable and repowering investments and in repurchasing common shares far in excess of our initial repurchase plan.”

Regional Segment Results

Table 1: Adjusted EBITDA

(1)    2011 results exclude the write-off of fixed assets and an impairment charge related to the Company’s acid rain program SO2 emission allowances

(2)    Corporate includes the results of Green Mountain Energy and profit elimination on intercompany revenue; 2011 nine-month results exclude impairment charges, 2010 nine-month results includes the gain on sale related to Padoma Wind

(3)    Detailed adjustments by region are shown in Appendix A

Table 2: Net Income/(Loss)

(1)    2011 results include the write-off of fixed assets and an impairment charge related to the Company’s acid rain program SO2 emission allowances

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(2)    Corporate includes the results of Green Mountain Energy and profit elimination on intercompany revenue; 2011 nine-month results include the NINA impairment charge and the resolution of a federal tax audit

(3)    Detailed adjustments by region are shown in Appendix A

Reliant: Third quarter adjusted EBITDA was $135 million, $74 million lower than the third quarter 2010 adjusted EBITDA of $209 million. The results were driven by lower gross margins of $101 million as unit margins declined due to a combination of competitive offerings and increased energy costs. The increase in energy costs was the result of price spikes during the August heat wave. Partially offsetting the decline, however, were increased volumes resulting from an average 9,000 increase in Mass customers year-over-year. Also, for the third straight quarter, customer count experienced an increase with 34,000 new customers added since year-end 2010.

Texas: Adjusted EBITDA for the third quarter of 2011 was $183 million compared to the third quarter of 2010 adjusted EBITDA of $388 million. The year-over-year results were driven by lower realized energy margins of $240 million due to a combination of lower baseload hedge prices and 2011 operations losses incurred due to the hedging and trading optimization strategy. Partially offsetting the decline was a 1.2 terawatt-hour, or 10%, improvement in generation which contributed $27 million as the gas and coal output was higher by 37% and 5%, respectively.

Northeast: Adjusted EBITDA for the third quarter was $47 million, $58 million lower than the third quarter of 2010. Energy margins declined $50 million primarily due to an overall decrease in realized energy prices in addition to a 24% decline in generation, primarily related to the coal fleet as the plants dispatched less frequently due to the lower energy prices. Furthermore, capacity revenues declined $28 million as lower capacity prices were experienced across the region. Partially offsetting these decreases were lower operating expenses of $17 million and increased equity earnings of $4 million as GenConn’s Middletown and Devon facilities were both operational in Q3 2011.

South Central: Adjusted EBITDA for the third quarter was $44 million, up $5 million from the $39 million reported in the same quarter in 2010. Gross margin increased as a result of 9% higher co-op and contract energy and capacity sales, as well as merchant sales that were up nearly 2.0 terawatt-hours. This was offset by operating expenses at Cottonwood which were not incurred during the same period last year prior to NRG’s acquiring the plant.

West: Adjusted EBITDA for the third quarter of 2011 was $35 million, up $11 million from the third quarter of 2010 due to increased capacity sales at El Segundo and Encina coupled with lower operating expenses.

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Liquidity and Capital Resources

Table 3: Corporate Liquidity

Note: On July 1, 2011, NRG replaced its Term Loan and revolving credit facilities with a new senior secured facility, or the 2011 Senior (Revolving) Credit Facility

In comparison to December 31, 2010, total liquidity decreased $2,333 million to $1,919 million driven largely by a $1,824 million decrease in cash and cash equivalents. This change in cash and cash equivalents is largely a result of the following:

·                  $577 million of debt pay-downs associated with refinancing activities and term-loan payments;

·                  $186 million of cash paid for maintenance and environmental capital expenditures (net of financing);

·                  $879 million for solar and repowering growth projects (net of financing);

·                  $193 million for the Energy Plus acquisition;

·                  $110 million of corporate debt issuance costs; and

·                  $378 million of share repurchases;

Providing a partial offset to the items listed above was $607 million of adjusted cash from operations.

Growth Initiatives and Developments

The Company made substantial progress since our previous quarterly earnings call on a considerable number of growth investments, the most significant of which were as follows:

·                  Agua Caliente — On August 5th, NRG completed the acquisition of the 290 MW facility from First Solar, Inc. In connection with the acquisition, the U.S. DOE provided a loan guarantee for up to $967 million to fund the solar facility construction. Once the project is operational in 2014, the output will be sold under a 25-year power purchase agreement with Pacific Gas and Electric Co. (PG&E).

·                  Avenal — On August 7th, NRG began commercial operations at Avenal, a 45 MW solar facility. Avenal is the largest solar photovoltaic (PV) generating facility currently operating in California and its output is sold to Pacific Gas & Electric under a 20-year power purchase agreement.

·                  El Segundo — On August 23rd, NRG entered into a credit agreement that established a loan facility in respect of the 550-megawatt El Segundo Repowering project. The Company expects commercial operations at El Segundo to begin in the third quarter of 2013. The El Segundo Energy Center will sell power under a 10-year purchase power agreement with Southern California Edison.

·                  Roadrunner — NRG’s 20 MW Roadrunner facility achieved commercial operation on August 31st. Roadrunner is the second-largest photovoltaic (PV) project in the state

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of New Mexico. The power generated is sold to El Paso Electric under a 20-year power purchase agreement.

·                  Prologis Partnership — NRG entered into a partnership agreement with ProLogis, Inc., on September 28th, to develop a distributed solar rooftop generation program of up to 733 MW, initially in southern California and subsequently in up to 28 states supported by a U.S. DOE loan commitment to guarantee up to 80% of a $1.4 billion long-term debt facility over a four-year period. As part of the DOE loan covenants, all projects are required to have a long-term off-take agreement with an investment grade load serving entity.

·                  Energy Plus Holdings — On September 30th, NRG acquired Energy Plus, a retail provider that serves more than 180,000 customers primarily in the Northeast, whose business is driven by its unique rewards program offered to its customers through its network of almost 100 industry-leading partners and associations.

·                  California Valley Solar Ranch (CVSR) — On September 30th, NRG completed the acquisition of the 250 MW California Valley Solar Ranch, or CVSR, from SunPower Corporation. NRG has entered into an EPC Agreement with SunPower to construct the solar photovoltaic project. CVSR, which commenced construction in the third quarter of 2011, has received a $1.2 billion loan guarantee from the U.S. DOE and will be fully operational in 2013. Once operational the output will be sold to PG&E through a 25-year power purchase agreement.

Outlook for 2011

2011 Share Repurchase Program

Year-to-date NRG has completed share repurchases totaling $378 million, or 17.5 million shares. During the third quarter the Company repurchased $190 million of shares through an accelerated share repurchase agreement totaling approximately 8.6 million shares at a volume weighted average cost of $21.97 per share. Another $58 million, or 2.7 million shares, were repurchased in the open market leaving $52 million of authorized share repurchases in order to achieve the share repurchase objectives announced earlier in the year. The Company’s share repurchase program consists of the original $180 million 2011 capital allocation plan and the $250 million additional plan, announced in August on the second quarter earnings call. This additional plan represents an acceleration of a portion of the 2012 capital allocation plan which will be determined after the Company has addressed the repurchase and refinancing of the Company’s 2017 bonds.

Guidance Update

NRG is narrowing its October 3rd 2011 adjusted EBITDA guidance range to $1,800-1,850 million from $1,775-1,850 million provided on October 3rd. The Company is also narrowing its guidance range for 2011 free cash flow before growth investments to $800-850 million from $875-950 million.

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Table 4: 2011 Reconciliation of Adjusted EBITDA Guidance

Note: Subtotals and totals are rounded

Outlook for 2012

While natural gas prices have continued to decline and capacity prices in the Northeast remain weak, an increase in Texas heat rates and the contribution from NRG’s new businesses and development assets enable NRG to initiate adjusted EBITDA guidance of $1,825-$2,000 million, an increase over current 2011 guidance. Key components of 2012 guidance include Wholesale contributing $1,200-$1,300 million and Retail businesses contributing $625-$700 million. Free cash flow before growth investment is expected to be $800-$1,000 million.

Table 5: 2012 Reconciliation of Adjusted EBITDA Guidance

Note: All amounts have been rounded

Earnings Conference Call

On November 3, 2011, NRG will host a conference call at 9:00 a.m. eastern to discuss these results. Investors, the news media and others may access the live webcast of the conference call and accompanying presentation materials by logging on to NRG’s website at http://www.nrgenergy.com and clicking on “Investors.” The webcast will be archived on the site for those unable to listen in real time.

About NRG

NRG is at the forefront of changing how people think about and use energy. A Fortune 500 company, NRG is a pioneer in developing cleaner and smarter energy choices for our customers: whether as one of the largest solar power developers in the country, or by building the first privately funded electric vehicle charging infrastructure or by giving customers the latest smart energy solutions to better manage their energy use. Our power generating facilities can support over 20 million homes and our retail electricity

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providers—Reliant, Green Mountain Energy Company and Energy Plus—serve more than two million customers. More information is available at nrgenergy.com.

Safe Harbor Disclosure

This news release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Such forward-looking statements are subject to certain risks, uncertainties and assumptions and include our adjusted EBITDA, free cash flow guidance, expected earnings, future growth, financial performance, capital allocation, environmental capital expenditures, and development projects, and typically can be identified by the use of words such as “will,” “expect,” “estimate,” “anticipate,” “forecast,” “plan,” “believe” and similar terms. Although NRG believes that its expectations are reasonable, it can give no assurance that these expectations will prove to have been correct, and actual results may vary materially. Factors that could cause actual results to differ materially from those contemplated above include, among others, general economic conditions, hazards customary in the power industry, weather conditions, successful partnering relationships, government loan guarantees, competition in wholesale and retail power markets, the volatility of energy and fuel prices, failure of customers to perform under contracts, changes in the wholesale power markets, changes in government regulation of markets and of environmental emissions, our ability to utilize tax incentives, the condition of capital markets generally, our ability to access capital markets, unanticipated outages at our generation facilities, adverse results in current and future litigation, our inability to implement value enhancing improvements to plant operations and companywide processes, our ability to maintain retail customers, our ability to achieve the expected benefits and timing of development projects, and the 2011 Capital Allocation Plan, and share repurchase under the Capital Allocation Plan may be made from time to time subject to market conditions and other factors, including as permitted by United States securities laws.

NRG undertakes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. The adjusted EBITDA guidance and free cash flows are estimates as of today’s date, November 3, 2011 and are based on assumptions believed to be reasonable as of this date. NRG expressly disclaims any current intention to update such guidance. The foregoing review of factors that could cause NRG’s actual results to differ materially from those contemplated in the forward-looking statements included in this news release should be considered in connection with information regarding risks and uncertainties that may affect NRG’s future results included in NRG’s filings with the Securities and Exchange Commission at www.sec.gov.

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Contacts:

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NRG ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

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NRG ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

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NRG ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED CASH FLOW STATEMENTS

(Unaudited)

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Appendix Table A-1: Third Quarter 2011 Regional Adjusted EBITDA Reconciliation

The following table summarizes the calculation of adjusted EBITDA and provides a reconciliation to net income/(loss)

Appendix Table A-2: Third Quarter 2010 Regional Adjusted EBITDA Reconciliation

The following table summarizes the calculation of adjusted EBITDA and provides a reconciliation to net income/(loss)

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Appendix Table A-3: YTD Third Quarter 2011 Regional Adjusted EBITDA Reconciliation

The following table summarizes the calculation of adjusted EBITDA and provides a reconciliation to net income/(loss)