Exhibit 99.1

NRG Energy, Inc. Reports Full-Year and Fourth Quarter Results; Exceeds 2013 Guidance, Announces Dividend Increase and Reaffirms 2014 Guidance

Full-Year 2013 Financial Highlights

·                  $2,636 million of Adjusted EBITDA; including $1,778 million delivered by NRG’s wholesale business, $614 million delivered by NRG retail business and $244 million delivered by NRG Yield;

·                  $1,282 million of Free Cash Flow (FCF) before Growth investments for the full-year of 2013 and $386 million in the fourth quarter;

·                  $3,695 million of total liquidity as of December 31, 2013

2014 Guidance(1)

·                  Reaffirming 2014 Guidance as follows:

·                  Adjusted EBITDA of $2,700-$2,900 million

·                  FCF before Growth investments of $950-$1,150 million

Business and Operational Highlights

·                  Successful integration of GenOn resulting in $484 million in Free Cash Flow before Growth benefits, an increase of $184 million from the original announcement;

·                  Completed the IPO of NRG Yield, receiving net proceeds of approximately $462 million from the offering;

·                  Achieved commercial operations of over 2 GW of solar and conventional generation projects, driving over $500 million of projected annualized Adjusted EBITDA;

·                  Retail customer count increased by about 65,000 during 2013;

·                  Acquired Energy Curtailment Specialists (ECS), one of the largest demand response providers in North America;

·                  Acquired the 388 MW, 160 MWt Gregory cogeneration plant in Texas

Capital Allocation

·                  Increasing annual common stock dividend by additional 17% from $0.48 to $0.56 per share, a total increase of 56% from the initial $0.36 per share in 2012; and

·                  Agreed to acquire substantially all of Edison Mission Energy’s (EME) assets for $2,635 million, including $1,063 million of acquired cash — funded with $800 million of cash on hand and $700 million from recently issued 2022 Senior Notes

PRINCETON, NJ; February 28, 2014 — NRG Energy, Inc. (NYSE: NRG) today reported 2013 full-year Adjusted EBITDA of $2,636 million with Wholesale contributing $1,778 million, Retail contributing $614 million and NRG Yield contributing $244 million. Full-year adjusted cash flow from operations totaled $1,725 million. Net loss for 2013 was ($386) million, or ($1.22) per diluted common share compared to net income of $295 million, or $1.22 per diluted common share for 2012, driven by fourth quarter 2013 impairment losses totaling $558 million primarily

(1)  Guidance for NRG Standalone, excluding any impact from pending EME transaction

from the Indian River facility and Gladstone investment versus fourth quarter 2012 bargain purchase gain of $296 million related to the GenOn acquisition.

Fourth quarter Adjusted EBITDA was $669 million and adjusted cash flow from operations was $550 million. Wholesale contributed $412 million of fourth quarter Adjusted EBITDA, Retail contributed $191 million and NRG Yield contributed $66 million. Net loss for the fourth quarter of 2013 totaled ($290) million, or ($0.90) per diluted common share, compared to a 2012 net income of $252 million or $1.02 per diluted common share, driven by the fourth quarter 2013 impairment losses and fourth quarter 2012 bargain purchase gain referenced in the previous paragraph.

Full-year 2013 FCF was $1,282 million, exceeding guidance by $107 million, driven by the strong fourth quarter results and reduced capital expenditures as NRG continued to execute on operational improvements.

“The core commodity-side of our business demonstrated remarkable strength in the fourth quarter which has continued into 2014, giving us a running start on a good year,” said David Crane, NRG President and Chief Executive Officer. “We have strong momentum in all three segments of our business: Wholesale, retail and clean energy.”

NRG had another year of strong safety and operating performance in 2013. The OSHA recordable rate of 0.77 was significantly better than top quartile performance and the coal generation fleet performed particularly well during peak price periods.  In addition, significant operational synergies were realized from the successful integration of 22 GW of generation from the GenOn transaction.

Segment Results

Table 1: Adjusted EBITDA

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

(2)         Revised to reflect new EBITDA methodology

2

Table 2: Net Income/(Loss)

(1)         Results include $558 million in impairment losses

(2)         Results include $296 million bargain purchase gain related to GenOn Merger

Retail: Full-Year 2013 Adjusted EBITDA was $614 million; $42 million lower than in 2012. Declining C&I sales and margin together with unseasonably mild weather in the second quarter were the primary drivers for lower Adjusted EBITDA. This was partially offset by higher volumes in the fourth quarter from colder than normal weather, continued growth in customer count and improved operating efficiencies.

Fourth quarter Adjusted EBITDA was $191 million; $39 million higher than the fourth quarter 2012. Favorable weather in November and December contributed to higher Adjusted EBITDA.  Retail also experienced continued customer growth and improved operating costs.

Wholesale:

Gulf Coast - Texas: Full-year 2013 Adjusted EBITDA was $502 million; $378 million lower than in 2012. Gross Margin declined by $392 million, driven by lower realized energy prices and higher fuel costs partially offset by higher sales volumes.  This year-over-year decrease in realized energy margin was largely attributable to a combination of lower economic hedges and wholesale prices. This reduction was partially offset by the acquisition of the Gregory Cogeneration facility (Gregory) in August 2013, increased revenue from bilateral agreements, improved fleet availability and decreases in operation and maintenance costs.

Fourth quarter Adjusted EBITDA was $91 million; $99 million lower than the fourth quarter 2012 despite an 11% increase in MWh generated. Higher fuel costs and lower hedged energy prices reduced gross margin by $96 million. This reduction was partially offset by the acquisition of Gregory, increased revenue from bilateral agreements and lower property taxes.

Gulf Coast - South Central: Full-year 2013 Adjusted EBITDA was $43 million; $58 million lower than in 2012. The unfavorable results were driven by a $51 million decline in gross margin due in part to lower sales volumes of 5% as improved contract sales volumes of 3% were more than offset by lower merchant sales activity of 15%. South Central entered into the MISO market on December 19, 2013.

Fourth quarter Adjusted EBITDA was $18 million lower than the fourth quarter of 2012. Gross margin was lower by $10 million despite a 13% increase in overall sales volumes as the increase was more than offset by a 31% decline in realized margins.

East: Full-year 2013 Adjusted EBITDA was $1,004 million; $902 million higher than in 2012 driven by the addition of assets from the GenOn transaction which contributed $781 million. The balance of the improvement in Adjusted EBITDA was driven by the Dunkirk reliability support services agreement and an increase in New York and PJM capacity prices.

3

Fourth quarter Adjusted EBITDA was $264 million; $233 million higher than the fourth quarter 2012 driven by the addition of assets from the GenOn transaction, a 34% increase in generation at the coal plants, the Dunkirk reliability support services agreement and an increase in New York and PJM capacity prices.

West: Full-year 2013 Adjusted EBITDA was $167 million; $79 million higher than in 2012 driven by the addition of assets from the GenOn transaction which contributed $92 million. Meanwhile, the region benefited from five months of contribution from the successful development of the El Segundo Energy Center, which achieved commercial operations in August 2013. However, this benefit was offset by increased costs related to California emission programs and a 50% decline in generation as the region was impacted by milder weather and increase in supply from new renewable and thermal generation.

Fourth quarter Adjusted EBITDA was $49 million; $30 million higher than the fourth quarter of 2012. This was driven by the addition of assets from the GenOn transaction, contributing $19 million, with the remainder driven by contributions from new and existing NRG assets including capacity revenues from the new El Segundo Energy Center.

NRG Yield: Full-year 2013 Adjusted EBITDA was $244 million; $143 million higher than in 2012. The performance was the result of new assets that achieved commercial operations.

Fourth quarter Adjusted EBITDA was $66 million; $44 million higher than the fourth quarter 2012. The performance was the result of new assets that achieved commercial operations.

Alternative Energy: Full-year 2013 Adjusted EBITDA was $91 million; $44 million higher than in 2012. Solar gross margin was $195 million, a $96 million increase from the prior year driven by the addition of new phases to the Company’s Agua Caliente and CVSR facilities as well as the acquisition of the High Desert and Kansas South projects. The improved margin was partially offset by NRG’s costs relating to continued development efforts for solar and new business.

Fourth quarter Adjusted EBITDA was $16 million; no change from the fourth quarter of 2012.  Solar gross margin was $43 million, a $19 million increase from the prior year driven by the addition of new phases to the Company’s Agua Caliente and CVSR facilities as well as the acquisition of the High Desert and Kansas South projects. The improved margin was offset by NRG’s costs relating to continued development efforts for solar and new businesses.

Liquidity and Capital Resources

Table 3: Corporate Liquidity

Total liquidity as of December 31, 2013 was $3,695 million, an increase of $333 million from December 31, 2012. The increase includes $115 million in total credit facility availability and $218 million in cash consisting of the following items:

·                  $2,187 million of cash inflows through December 2013, consisting of the following items:

4

·                  $1,725 million of adjusted cash flow from operations; and

·                  $462 million of proceeds from NRG Yield IPO; and

·                  Partially offset by $1,969 million of cash outflows through December 2013, consisting of the following items:

·                  $494 million for acquisitions, net of cash acquired;

·                  $485 million net debt payments consisting of $775 million repurchase of Senior Notes and $160 million repayments of debt; partially offset by $450 million in proceeds from the Term Loan B issuance;

·                  $429 million of maintenance and environmental capital expenditures, net;

·                  $179 million return to shareholders consisting of $154 million of common and preferred stock dividends and $25 million share repurchases;

·                  $173 million of merger and integration expenses;

·                  $143 million of solar and conventional growth investments (excluding solar acquisitions and cash grant debt repayments), net of debt proceeds, third party funding and cash grant proceeds net of debt repayments;

·                  $66 million of other investing and financing, net

Growth Initiatives and Strategic Developments

NRG continued to enhance its competitiveness and strategic positioning through a wide range of growth initiatives, including:

Acquisition of Edison Mission Energy

On October 18, 2013, the Company entered into an agreement with EME, certain of its owners and other stakeholders to acquire substantially all of EME’s assets for $2,635 million, including $1,063 million of cash on hand. Upon closing, this transaction would add approximately 8,000 MW of generation assets, including 1,600 MW of long-term, fully-contracted assets eligible for future drop-down to NRG Yield. The transaction is subject to approvals and, assuming all conditions are met, the transaction is expected to close in the first quarter of 2014.

IPO of NRG Yield

On July 22, 2013, the Company successfully completed the IPO of NRG Yield creating a best-in-class total return investment vehicle and providing a key source of equity capital to fuel the continued success of NRG’s growing platform of contracted generation. NRG received proceeds of approximately $462 million from the offering enhancing capital for allocation.

Conventional

·                  Marsh Landing — On May 1, 2013, the Company achieved commercial operations at its Marsh Landing Generating station, a 720 MW fast-start, gas-fired peaking facility near Antioch, California. The facility is contracted with Pacific Gas and Electric Co. (PG&E) under a 10-year PPA.

·                  El Segundo — On August 1, 2013, the Company achieved commercial operations at its El Segundo Energy Center, a 550 MW fast-start, gas-fired combined cycle generating facility in El Segundo, California. The facility is contracted with Southern California Edison (SCE) under a 10-year PPA.

5

·                  Gregory - On August 7, 2013, the Company closed on the acquisition of the 388 MW, 160 MWt Gregory Cogeneration plant in Corpus Christi, Texas, for $244 million (after working capital adjustments), expanding its growing cogeneration fleet as it provides NRG with additional cost-effective baseload power in ERCOT. This acquisition was funded by $120 million of Term Loan proceeds and NRG equity.

Solar

·                  Agua Caliente — As of December 31, 2013, achieved commercial operations of 290 MW of generation capacity of Agua Caliente, making it the largest operating solar PV project in the world. Construction is several months ahead of schedule and is currently expected to reach full completion in early 2014. Power generated by Agua Caliente is being sold under a 25-year PPA to PG&E. NRG owns a 51% interest in the project.

·                  CVSR — On October 31, 2013, achieved full and on-time commercial operations of the 250 MW CVSR project. Power from this project is being sold to PG&E under 25-year PPAs.

·                  Ivanpah — On December 31, 2013, achieved commercial operations of the 378 MW Ivanpah project, now the world’s largest solar thermal power project, generating enough electricity to power 140,000 California homes. Power from Units 1 and 3 is being sold to PG&E via two 25-year PPAs, and power from Unit 2 is being sold to SCE under a 20-year PPA.

Outlook for 2014

NRG is reaffirming its Adjusted EBITDA and FCF before Growth investments guidance for 2014.

Table 4: 2014 Adjusted EBITDA and FCF before Growth investments Guidance(1)

Notes - subtotals and totals are rounded

(1) Guidance for NRG standalone, excluding any impact from pending EME transaction

(2) Excludes interest payments from $700 million of debt proceeds to be used to acquire EME

6

2014 Capital Allocation Program

The Company hereby announces an increase in its annual common stock dividend by an additional 17% from $0.48 to $0.56 per share, a total increase of 56% from $0.36 per share in 2012, beginning with next scheduled payment.

On January 27, 2014, NRG closed an offering of $1,100 million of Senior Notes due 2022. The notes are senior unsecured obligations of NRG and are guaranteed by certain of its subsidiaries. On February 10, 2014, NRG tendered offer to repurchase $400 million Senior Notes due in 2019 and intends to use the proceeds from the rest of offering to fund the Edison Mission Energy (“EME”) acquisition. If the EME acquisition is not closed, NRG intends to use the proceeds from the offering to repay existing debts and to pay related fees and expenses. All remaining amounts, if any, will be used for general corporate purposes.

The Company’s common stock dividend and debt reduction are subject to available capital, market conditions and compliance with associated laws and regulations.

Drop-Down of Assets to NRG Yield:

In the first quarter of 2014, NRG Energy, Inc. has commenced discussion with NRG Yield, Inc. on the following NRG ROFO Assets:

·                  TA High Desert — 20 MW solar facility located in LA County, CA

·                  RE Kansas South — 20 MW solar facility located in Kings County, CA

·                  El Segundo Energy Center — 550 MW fast-start, gas-fired facility located in LA County, CA

The cash proceeds from these drop-downs would increase NRG’s capital available for allocation.

On February 11, 2014, NRG Yield announced an offering of $300 million, 3.5% convertible Senior Notes due 2019. NRG Yield intends to use the proceeds for working capital and general corporate purposes, including the acquisition of assets from NRG or other third parties. In addition, the underwriters exercised their greenshoe option to purchase an additional $45 million in aggregate principal amount of the NRG Yield Senior Notes. NRG Yield, Inc. expects to receive the related proceeds in early March.

Earnings Conference Call

On February 28, 2014, NRG will host a conference call at 9:00 am 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.

Additional Information

NRG has filed a registration statement (including a prospectus) with the SEC for the offering of NRG common stock to which this communication relates. The NRG common stock may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. This press release shall not constitute an offer to sell or a solicitation of an offer to buy, nor shall there be any sale of NRG common stock in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. You should read the prospectus in that registration statement and other documents NRG has filed with the SEC for more complete information about NRG and

7

this offering before making any investment decision. You may obtain these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the Company will arrange to send you the prospectus if you request it by calling 609-524-4500 or emailing investor.relations@nrgenergy.com.

About NRG

NRG is leading a customer-driven change in the U.S. energy industry by delivering cleaner and smarter energy choices, while building on the strength of the nation’s largest and most diverse competitive power portfolio. A Fortune 500 company, we create value through reliable and efficient conventional generation while driving innovation in solar and renewable power, electric vehicle ecosystems, carbon capture technology and customer-centric energy solutions. Our retail electricity providers — Reliant, Green Mountain Energy, Energy Plus and NRG Residential Solutions — serve more than 2 million residential and commercial customers throughout the country. More information is available at www.nrgenergy.com. Connect with NRG Energy on Facebook and follow us on Twitter @nrgenergy.

Safe Harbor Disclosure

This news release includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Exchange Act. These statements involve estimates, expectations, projections, goals, assumptions, known and unknown risks and uncertainties and can typically be identified by terminology such as “may,” “should,” “could,” “objective,” “projection,” “forecast,” “goal,” “guidance,” “outlook,” “expect,” “intend,” “seek,” “plan,” “think,” “anticipate,” “estimate,” “predict,” “target,” “potential” or “continue” or the negative of these terms or other comparable terminology. Such forward-looking statements include, but are not limited to, statements about the Company’s future revenues, income, indebtedness, capital structure, plans, expectations, objectives, projected financial performance and/or business results and other future events, and views of economic and market conditions.

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, competition in wholesale 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, 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, failure to identify or successfully implement acquisitions and repowerings, our ability to implement value enhancing improvements to plant operations and companywide processes, our ability to obtain federal loan guarantees, the inability to maintain or create successful partnering relationships, our ability to operate our businesses efficiently including NRG Yield, our ability to retain retail customers, our ability to realize value through our commercial operations strategy and the creation of NRG Yield, the ability to successfully integrate acquired businesses, the ability to realize anticipated benefits of these transactions (including expected cost savings and other synergies) or the risk that anticipated benefits may take longer to realize than expected, our ability to close the proposed EME transaction 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. Furthermore, any common stock dividend is subject to available capital and market conditions.

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, February 28, 2014 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. In addition, NRG makes available free of charge at www.nrgenergy.com (in the “Investors” section), copies of materials it files with, or furnish to, the SEC.

8

Contacts:

9

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

10

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME/(LOSS)

(Unaudited)

11

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

12

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

13

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

14

Appendix Table A-1: Fourth Quarter 2013 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: Fourth Quarter 2012 Regional Adjusted EBITDA Reconciliation

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