Exhibit 99.1

NRG Energy, Inc. Reports Record 2015 Adjusted EBITDA Results,

Reaffirms 2016 Financial Guidance, Announces

Retirement of $691 Million of Debt, and Realigns Dividend

2015 Results and Financial Highlights

·                  Record Adjusted EBITDA(1) of $3,340 million, including best ever results from NRG Home Retail since 2009 acquisition — a validation of NRG’s leading integrated competitive power platform

·                  $1,127 million of Free Cash Flow (FCF) before growth investments

·                  Over $1.3 billion of capital returned to stakeholders

·            $691 million of debt retired(2); approximately $54 million in annual interest savings

·            $628 million returned to shareholders in 2015

·                  $786 million of NRG Yield dropdown proceeds in 2015

·                  $5.1 billion and $3.0 billion non-cash one-time charges for impairments and income tax valuation allowance expense, respectively, primarily driven by the extended low commodity price cycle for the Texas wholesale generation

Operational and Strategic Update

·                  Allocating $925 million of additional 2016 capital to incremental NRG-level debt reduction

·                  GreenCo strategic process: Reintegrating NRG Renew into the NRG platform; expect resolution for NRG Home Solar and EVgo in the second quarter 2016

·                  Asset sales completed or pending represent 877 MWs and $138 million of $500 million 2016 asset sales target

·                  Reducing annual dividend to $0.12 per share to enhance flexibility on capital allocation, reallocating approximately $145 million annually

2016 Financial Guidance

·                  2016 Guidance is reaffirmed, and now includes GreenCo’s NRG Renew

·                  Adjusted EBITDA of $3,000-$3,200 million

·                  FCF before growth investments of $1,000-$1,200 million

PRINCETON, NJ — February 29, 2016 — NRG Energy, Inc. (NYSE: NRG) today reported record full-year Adjusted EBITDA of $3,340 million. Adjusted cash flow from operations totaled $1,945 million for 2015. Net loss for the twelve months of 2015 was $6,436 million, including non-cash charges of $3,306 million(3) and $3,039 million for asset impairments net of taxes and income tax valuation allowance expense, respectively.  These non-cash charges were primarily driven by the low commodity cycle and its impact on the Texas wholesale business. This resulted in a $19.46 loss per diluted common share in 2015 compared to net income of $132 million, or $0.23 per diluted common share in 2014.  Excluding the impact of the impairments and tax valuation allowance, the Company’s net loss would have been $91 million or $0.34 loss per diluted common share for the twelve months of 2015.

“Amid a continued weak commodity price environment, NRG’s integrated competitive power platform once again delivered strong financial results, demonstrating that we have the right portfolio and the right platform to succeed,” said Mauricio Gutierrez, NRG President and Chief Executive Officer. “Today we are reintegrating our successful business renewables solutions back into NRG as an important part of our diversified platform. With the further

(1)  Excludes negative contribution from NRG Home Solar of $173 million.

(2)  Represents total discretionary debt retirements from November 2015 through February 2016 (excludes $405 million of non-discretionary debt amortization in 2015)

(3)  Total impairments of $5,086 million net of taxes of $1,780 million.

strengthening of our balance sheet and increased flexibility from recalibrating our dividend, we will be in a stronger position to benefit from market opportunities.”

NRG continued its strong track record of safety performance with a top quartile recordable rate of 0.71 for the full year 2015(4).  Overall generation was down 3% from 2014, with coal and nuclear availability at 83.8% improving 2.4% over 2014.

Today, NRG also announces the reintegration of business renewables (formerly GreenCo’s NRG Renew) back into NRG. This move supports NRG’s advantaged position to participate in the changing landscape of the power industry and serve customers, especially with on- and offsite solar and distributed generation in the commercial and industrial space.

Segment Results

Table 1: Adjusted EBITDA

(a)   In accordance with GAAP, 2015 and 2014 results have been restated to include the full impact of the NRG Yield drop down transactions which closed on November 3, 2015, January 2, 2015 and June 30, 2014.

(b)   See Appendices A-6 through A-9 for NRG Business regional details.

(c)    See Appendices A-1 through A-4 for Operating Segment Reg G reconciliations; excludes negative Adjusted EBITDA from NRG Home Solar

Table 2: Net (Loss)/Income

(a)         In accordance with GAAP, 2014 results have been restated to include full impact of the assets in the NRG Yield drop down transactions which closed on November 3, 2015, January 2, 2015 and June 30, 2014

(b)         Includes non-cash impairment charges of $4,823 million and $5,086 million for the three and twelve months ended December 31, 2015, respectively

(c)          Includes non-cash income tax expense of $1,385 million and $1,342 million for the three and twelve months ended December 31, 2015, respectively

(d)         Includes mark-to-market gains and losses of economic hedges

NRG Business: Full year 2015 Adjusted EBITDA was $1,798 million; $38 million lower than 2014 primarily driven by:

·                  Gulf Coast Region: $201 million increase due to higher average realized prices in Texas reflecting ERCOT hedge gains plus higher realized energy margins and capacity revenues in South Central offsetting lower coal generation across the region

·                  East Region: $187 million lower due to declining energy margins from the absence of extreme weather which benefited first quarter 2014, lower capacity volumes following plant deactivations in PJM, partially offset by lower operating costs from reduced outages and decreased run times across the fleet, and the benefit of the full year impact of the coal assets acquired on April 1, 2014 from Edison Mission Energy

(4)  Excludes Goal Zero, NRG Home Services and NRG Home Solar

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Fourth quarter Adjusted EBITDA was $308 million, $6 million higher than the fourth quarter 2014 primarily driven by:

·                  Gulf Coast Region: $54 million increase due to higher average realized prices in Texas reflecting ERCOT hedge gains plus higher realized energy margins and capacity revenues in South Central, all offsetting lower coal and nuclear generation in Texas driven by outages and lower market prices

·                  East Region: $45 million lower due to lower energy margins from milder weather, declines in gas prices and dark spreads, partially offset by increased contract margins attributable to new load contracts and lower supply costs, and lower operating costs from reduced outages, plant deactivations, and decreased run times across the fleet

NRG Home Retail: Full year 2015 Adjusted EBITDA was $739 million, $135 million higher than 2014 driven primarily by favorable supply costs and weather as well as continued effective customer operations and margin management across the portfolio.

Fourth quarter Adjusted EBITDA was $144 million, $21 million lower than the fourth quarter 2014 primarily due to lower volume driven by milder weather.

NRG Renew: Full year 2015 Adjusted EBITDA was $171 million, $1 million lower than 2014 primarily due to higher development costs, offset by increased production at Ivanpah.

Fourth quarter Adjusted EBITDA was $22 million, $9 million lower than the fourth quarter 2014 primarily due to higher development costs.

NRG Yield: Full year 2015 Adjusted EBITDA was $720 million, $138 million higher than  2014 primarily due to the Desert Sunlight and Alta Wind acquisitions.

Fourth quarter Adjusted EBITDA was $183 million, $24 million higher than the fourth quarter 2014 primarily due to the Desert Sunlight acquisition.

Asset Impairments and Valuation Allowance Tax Expense

NRG recorded total non-cash impairment charges of $5,086 million for the full year 2015; $3,549 million related to asset impairments and $1,537 million related to goodwill impairments.  The majority of the asset impairment charges were related to the Company’s Limestone and W.A. Parish coal fired facilities located in Texas, and for three coal fired facilities in the Company’s East region.  The annual goodwill impairment assessment resulted in non-cash charges to write down the Company’s investments in Texas Genco (acquired 2006) and the NRG Home Solar reporting units. The asset and goodwill impairments were primarily driven by the extended low commodity price environment, while the NRG Home Solar goodwill impairment was due to the lower than expected performance of the business.

The low commodity price environment and resulting impairments also lead to $3.0 billion in non-cash income tax expense related to a valuation allowance offsetting the Company’s net deferred tax assets. This allowance was necessary as the impairments impacted the Company’s cumulative and forecasted book earnings; however, the valuation allowance does not affect the Company’s ability to utilize its NOLs against future taxable income.

Dividend Reduction — Alignment

NRG’s Board of Directors has approved a reduction in the annual dividend to $0.12 per share from $0.58 per share. The reduction will allow NRG to reallocate approximately $145 million annually and provides additional flexibility to create shareholder value through all commodity, credit, and development cycles and seize market opportunities.

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Liquidity and Capital Resources

Table 3: Corporate Liquidity

NRG-level cash as of December 31, 2015, was $693 million, an increase of $32 million over the end of 2014, and $1,373 million was available under the Company’s credit facilities at the end of 2015. Total liquidity was $3,305 million including restricted cash and cash at non-guarantor subsidiaries (primarily GenOn and NRG Yield)(5).

NRG Strategic Developments

NRG Yield

The Company has amended its partnership agreements with NRG Yield in order to reallocate $50 million of NRG Yield’s previously committed cash equity from the residential solar partnership to the business renewables partnership. This amendment reinforces NRG Energy’s relationship with NRG Yield by ensuring NRG Yield’s investment capital is more closely aligned with NRG Energy’s focus on renewable energy.

This amendment does not impact the existing ROFO agreement.

NRG Business

NRG Business’s multi-year capital investment program includes both generation additions and fuel conversions totaling approximately 4,659 MWs of generation capacity across the Company’s geographic footprint. This enables the Company to bid generation assets in regional forward capacity markets while also meeting key environmental compliance goals. Assets that completed or are undergoing planned fuel conversions or additions include Bowline 2 (COD second quarter 2015), Joliet Units 6-8 (expected COD second quarter 2016), New Castle Units 3-5 (expected COD second quarter 2016), and Shawville 1-4 (expected COD third quarter 2016). In Illinois, NRG completed the installation of environmental control upgrades at its 689 MW Waukegan coal facility (COD second quarter 2015) and environmental control upgrades continue at its 1,538 MW Powerton coal facility.  When combined with the fuel conversion at Joliet and the retirement of the 251 MW Will County Unit 3 in second quarter 2015, these actions are expected to result in significant emissions improvement in Illinois.

In 2015, NRG completed a gas conversion at the Big Cajun II Unit 2, enhanced environmental controls at Sayreville, Gilbert and W.A. Parish facilities. NRG is on track to successfully complete Avon Lake Unit 9 environmental enhancements by the middle of 2016.

(5)  See Appendix A-10 for the Full Year 2015 Sources and Uses of Liquidity detail.

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Construction of the 360 MW Cielo Lindo peaker facility (formerly P.H. Robinson facility), preparations for the Company’s 527 MW Carlsbad peaker project, and the 262 MW Puente simple-cycle generation facility in Oxnard, CA remain on track.

2016 Guidance

NRG is reaffirming its guidance range for 2016 with respect to both Adjusted EBITDA and FCF before growth investments. The Company’s 2016 guidance now includes GreenCo’s NRG Renew.

Table 4: 2016 Adjusted EBITDA and FCF before Growth Investments Guidance

(a)         Reduced by $50 million versus prior guidance to reflect $691 million of debt retirement completed since third quarter 2015 earnings conference call

(b)         Increase of $50 million versus prior guidance to reflect timing of spend between 2015 into 2016

Capital Allocation Update

Through February 29, 2016, the Company utilized $385 million ($417 million par) of the $500 million of capital allocated to debt reduction at the NRG Corporate-level announced on its third quarter 2015 earnings conference call.  NRG intends to complete the remaining debt repurchases under the previously announced program and is allocating an additional $925 million towards additional NRG debt repurchases in 2016 for a total of $1.3 billion of incremental debt reduction.

When combined with 2016 repurchases already completed and approximately $370 million in non-discretionary amortization primarily associated with project financings, debt reduction represents nearly 75% of total NRG capital allocated in 2016.

In 2015, NRG’s GenOn subsidiaries retired $119 million of GenOn Energy, Inc. Senior Notes and $155 million of GenOn Americas Generation, LLC Senior Notes through open market purchases.

On January 18, 2016, NRG declared a quarterly dividend on the Company’s common stock of $0.145 per share, payable February 16, 2016, to stockholders of record as of February 1, 2016. Going forward and in line with today’s announcement, NRG’s dividend will be $0.03 per share, on a quarterly basis.

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

Earnings Conference Call

On February 29, 2016, NRG will host a conference call at 7:30 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.nrg.com and clicking on “Investors.” The webcast will be archived on the site for those unable to listen in real time.

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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 200 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 serve almost 3 million residential and commercial customers throughout the country. More information is available at www.nrg.com. Connect with NRG Energy on Facebook and follow us on Twitter @nrgenergy.

Safe Harbor Disclosure

In addition to historical information, the information presented in this communication 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 be 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 with NRG Yield and other third parties, 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 the businesses of acquired companies,  the ability to realize anticipated benefits of acquisitions (including expected cost savings and other synergies) and  the ability to sell assets to NRG Yield, Inc. or the risk that anticipated benefits may take longer to realize than expected and our ability to pay dividends and initiate share or debt repurchases under our capital allocation plan, which 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 or debt repurchases are 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, except as required by law. The adjusted EBITDA and free cash flow guidance are estimates as of February 29, 2016. These estimates are based on assumptions the company believed to be reasonable as of that date. NRG disclaims any current intention to update such guidance, except as required by law. The foregoing review of factors that could cause NRG’s actual results to differ materially from

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those contemplated in the forward-looking statements included in this Earnings Presentation 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.

Contacts:

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NRG ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

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NRG ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME

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NRG ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

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NRG ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (Continued)

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NRG ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

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Appendix Table A-1: Fourth Quarter 2015 Adjusted EBITDA Reconciliation by Operating Segment

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

Appendix Table A-2: Fourth Quarter 2014 Adjusted EBITDA Reconciliation by Operating Segment

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

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Appendix Table A-3: Full Year 2015 Adjusted EBITDA Reconciliation by Operating Segment

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