NRG · Nrg Energy, Inc.

This transaction was executed in multiple trades. The price reported reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 8, 2025.

This transaction was executed in multiple trades. The price reported reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 8, 2025.

The Conversion Price is $0.00

On June 5, 2023, the Reporting Person was issued 4,982 RSUs by NRG under the NRG Energy, Inc. Long-Term Incentive Plan. On June 5, 2026, 1,664 shares vested. The Reporting Person elected to satisfy their tax obligation upon the exchange of Common Stock for RSUs having a value on the date of the exchange equal to the withholding obligation. This form reflects the surrender of 697 shares of Common Stock to satisfy the Reporting Person's tax withholding obligation. In connection with the vesting of the RSUs, 105 DERs vested, resulting in the Reporting Person holding 167 DERs in the aggregate.

In connection with the vesting of the RPSUs described above, an incremental 1,007 Dividend Equivalent Rights vested. Each DER is the economic equivalent of one share of Common Stock.

The Reporting Person was issued 15,948 Relative Performance Stock Units by NRG Energy, Inc. under NRG's Long-Term Incentive Plan that vested subject to certain performance conditions on June 5, 2026.

Unit Price is $0.00

In connection with the vesting of the RPSUs described above, an incremental 1,410 Dividend Equivalent Rights vested. Each DER is the economic equivalent of one share of Common Stock.

The Reporting Person was issued 22,328 Relative Performance Stock Units by NRG Energy, Inc. under NRG's Long-Term Incentive Plan that vested subject to certain performance conditions on June 5, 2026.

The Reporting Person elected to satisfy their tax withholding obligation upon the exchange of Common Stock for RPSUs having a value on the date of the exchange equal to the withholding obligation. This form reflects the surrender of 12,142 shares of Common Stock to satisfy the Reporting Person's tax withholding obligation.

On June 5, 2023, the Reporting Person was issued 6,975 RSUs by NRG under the NRG Energy, Inc. Long-Term Incentive Plan. On June 5, 2026, 2,330 shares vested. The Reporting Person elected to satisfy their tax obligation upon the exchange of Common Stock for RSUs having a value on the date of the exchange equal to the withholding obligation. This form reflects the surrender of 1,267 shares of Common Stock to satisfy the Reporting Person's tax withholding obligation. In connection with the vesting of the RSUs, 147 DERs vested, resulting in the Reporting Person holding 378 DERs in the aggregate.

The Reporting Person elected to satisfy their tax withholding obligation upon the exchange of Common Stock for RPSUs having a value on the date of the exchange equal to the withholding obligation. This form reflects the surrender of 6,672 shares of Common Stock to satisfy the Reporting Person's tax withholding obligation.

Represents 1,499 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit is equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. The Reporting Person will receive from NRG Energy, Inc. one such share of Common Stock for each Deferred Stock Unit they own upon termination of their service on NRG Energy, Inc.'s Board of Directors.

Includes 5,383 Dividend Equivalent Rights.

Represents 2,619 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit is equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. The Reporting Person will receive from NRG Energy, Inc. one such share of Common Stock for each Deferred Stock Unit they own upon termination of their service on NRG Energy, Inc.'s Board of Directors.

Includes 283 Dividend Equivalent Rights.

Represents 1,422 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit was equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. On June 1, 2026, the Reporting Person received from NRG Energy, Inc. one such share of Common Stock in exchange for each Deferred Stock Unit they were issued on that same date.

Represents 2,464 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit is equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. The Reporting Person will receive from NRG Energy, Inc. one such share of Common Stock for each Deferred Stock Unit they own upon termination of their service on NRG Energy, Inc.'s Board of Directors.

Includes 4 Dividend Equivalent Rights.

Represents 1,557 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit is equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. The Reporting Person will receive from NRG Energy, Inc. one such share of Common Stock for each Deferred Stock Unit they own upon termination of their service on NRG Energy, Inc.'s Board of Directors.

Includes 3,370 Dividend Equivalent Rights.

Represents 1,499 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit was equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. On June 1, 2026, the Reporting Person received from NRG Energy, Inc. one such share of Common Stock in exchange for each Deferred Stock Unit they were issued on that same date.

Includes 2,390 Dividend Equivalent Rights.

Represents 1,422 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit was equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. On June 1, 2026, the Reporting Person received from NRG Energy, Inc. one such share of Common Stock in exchange for each Deferred Stock Unit they were issued on that same date.

Includes 1,745 Dividend Equivalent Rights.

Represents 1,422 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit was equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. On June 1, 2026, the Reporting Person received from NRG Energy, Inc. one such share of Common Stock in exchange for each Deferred Stock Unit they were issued on that same date.

Represents 1,422 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit is equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. The Reporting Person will receive from NRG Energy, Inc. one such share of Common Stock for each Deferred Stock Unit they own upon termination of their service on NRG Energy, Inc.'s Board of Directors.

Includes 239 Dividend Equivalent Rights.

Represents 2,318 Deferred Stock Units issued to the Reporting Person under NRG Energy, Inc.'s Long-Term Incentive Plan. Each Deferred Stock Unit was equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. On June 1, 2026, the Reporting Person received from NRG Energy, Inc. one such share of Common Stock in exchange for each Deferred Stock Unit they were issued on that same date.

Includes 1,562 Dividend Equivalent Rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 2,390 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 1,562 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 4 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred stock units and or restricted stock units, which become exercisable proportionately with the underlying units to which they are related and may only be settled in NRG common stock. Each dividend right is the economic equivalent of one share of NRG common stock. Includes 272 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred stock units and or restricted stock units, which become exercisable proportionately with the underlying units to which they are related and may only be settled in NRG common stock. Each dividend right is the economic equivalent of one share of NRG common stock. Includes 297 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 3,370 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 2,491 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred stock units and or restricted stock units, which become exercisable proportionately with the underlying units to which they are related and may only be settled in NRG common stock. Each dividend right is the economic equivalent of one share of NRG common stock. Includes 525 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 283 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 239 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred stock units and or restricted stock units, which become exercisable proportionately with the underlying units to which they are related and may only be settled in NRG common stock. Each dividend right is the economic equivalent of one share of NRG common stock. Includes 151 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred stock units and or restricted stock units, which become exercisable proportionately with the underlying units to which they are related and may only be settled in NRG common stock. Each dividend right is the economic equivalent of one share of NRG common stock. Includes 272 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred stock units and or restricted stock units, which become exercisable proportionately with the underlying units to which they are related and may only be settled in NRG common stock. Each dividend right is the economic equivalent of one share of NRG common stock. Includes 112 dividend equivalent rights and 108 shares acquired under NRG's Employee Stock Purchase Plan since the Reporting Person's last filing.

Represents dividend equivalent rights accrued on the Reporting Person's deferred stock units and or restricted stock units which become exercisable proportionately with the underlying units to which they are related and may only be settled in NRG common stock. Each dividend right is the economic equivalent of one share of NRG common stock. Includes 345 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 5,383 dividend equivalent rights.

On April 30, 2026, the Reporting Person was issued 32,602 RPSUs by NRG under the Company's Long Term Incentive Plan that vest on April 30, 2029, subject to certain performance conditions.

On April 30, 2026, the Reporting Person was issued 13,423 RPSUs by NRG under the Company's Long Term Incentive Plan that vest on April 30, 2029, subject to certain performance conditions.

This transaction was executed in multiple trades. The price reported reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. The sales reported in the Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 8, 2025.

Also on March 4, 2026, the Selling Stockholders sold shares of the Issuer's Common Stock at a price of $164 to the Issuer pursuant to a Stock Repurchase Agreement dated as of February 27, 2026.

3,782,093, 799,282, and 239,356 shares are held directly by Lightning Power Holdings, LLC, Thunder Generation LLC, and CCS Power Holdings, LLC, respectively. The reporting person is the investment advisor to the LS Power entities who may be deemed to beneficially own the securities held by the Selling Stockholders is LS Power Equity Advisors, LLC (LSP Advisors).

The reporting person, through its position, relationship and/or affiliation with the LS Power entities, may have shared voting and investment power with respect to the shares beneficially owned by the LS Power entities. As such, the reporting person may be deemed to have or share beneficial ownership of the shares beneficially owned by the LS Power entities.

Also on March 4, 2026, the Selling Stockholders sold shares of the Issuer's Common Stock at a price of $164 to the Issuer pursuant to a Stock Repurchase Agreement dated as of February 27, 2026.

3,782,093, 799,282, and 239,356 shares are held directly by Lightning Power Holdings, LLC, Thunder Generation LLC, and CCS Power Holdings, LLC, respectively. The investment advisor to the LS Power entities who may be deemed to beneficially own the securities held by the Selling Stockholders is LS Power Equity Advisors, LLC (LSP Advisors). The reporting person is the President of LSP Advisors.

The reporting person, through his position, relationship and/or affiliation with the LS Power entities, may have shared voting and investment power with respect to the shares beneficially owned by the LS Power entities. As such, the reporting person may be deemed to have or share beneficial ownership of the shares beneficially owned by the LS Power entities. The reporting person disclaims beneficial ownership of such shares.

These shares were sold by Lightning Power Holdings, LLC, Thunder Generation LLC, and CCS Power Holdings, LLC (the Selling Stockholders) pursuant to an underwriting agreement dated March 2. 2026, among the Selling Stockholders, the Issuer, Barclays Capital Inc. and Citibank Global Markets Inc., at a price per share of $164, before underwriting discounts and commissions (the Secondary Offering). The Secondary Offering closed on March 4, 2026.

3,782,093, 799,282, and 239,356 shares are held directly by Lightning Power Holdings, LLC, Thunder Generation LLC, and CCS Power Holdings, LLC, respectively. The investment advisor to the LS Power entities who may be deemed to beneficially own the securities held by the Selling Stockholders is LS Power Equity Advisors, LLC (LSP Advisors). The reporting person is the President of LSP Advisors.

The reporting person, through his position, relationship and/or affiliation with the LS Power entities, may have shared voting and investment power with respect to the shares beneficially owned by the LS Power entities. As such, the reporting person may be deemed to have or share beneficial ownership of the shares beneficially owned by the LS Power entities. The reporting person disclaims beneficial ownership of such shares.

These shares were sold by Lightning Power Holdings, LLC, Thunder Generation LLC, and CCS Power Holdings, LLC (the Selling Stockholders) pursuant to an underwriting agreement dated March 2. 2026, among the Selling Stockholders, the Issuer, Barclays Capital Inc. and Citibank Global Markets Inc., at a price per share of $164, before underwriting discounts and commissions (the Secondary Offering). The Secondary Offering closed on March 4, 2026.

3,782,093, 799,282, and 239,356 shares are held directly by Lightning Power Holdings, LLC, Thunder Generation LLC, and CCS Power Holdings, LLC, respectively. The reporting person is the investment advisor to the LS Power entities who may be deemed to beneficially own the securities held by the Selling Stockholders is LS Power Equity Advisors, LLC (LSP Advisors).

The reporting person, through its position, relationship and/or affiliation with the LS Power entities, may have shared voting and investment power with respect to the shares beneficially owned by the LS Power entities. As such, the reporting person may be deemed to have or share beneficial ownership of the shares beneficially owned by the LS Power entities.

Represents 1,453 Deferred Stock Units issued to the reporting person under NRG Energy, Inc.'s Amended and Long Term Incentive Plan.

Each Deferred Stock Unit is equivalent in value to one share of NRG Energy, Inc.'s Common Stock, par value $.01 per share. The Reporting Person will receive from NRG Energy, Inc. one such share of Common Stock for each Deferred Stock Unit he owns upon termination of his service on NRG Energy, Inc.'s Board of Directors.

Represents dividend equivalent rights accrued on the Reporting Person's deferred stock units and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 21,159 dividend equivalent rights.

Represents dividend equivalent rights accrued on the Reporting Person's deferred and or restricted stock units, which become exercisable proportionately with the underlying units to which they relate and may only be settled in NRG common stock. Each dividend equivalent right is the economic equivalent of one share of NRG common stock. Includes 2,317 dividend equivalent rights.