Tax Receivable Agreement Liability	6 Months Ended
Jun. 30, 2026
Tax Receivable Agreement Liability [Abstract]
Tax Receivable Agreement Liability	Tax Receivable Agreement Liability In connection with the CRIS Business Combination, EVgo entered into a tax receivable agreement (the “Tax Receivable Agreement”) with EVgo Holdings (along with permitted assigns, the “TRA Holders”) and LS Power Equity Advisors, LLC, as agent. The Tax Receivable Agreement generally provides for payment by the Company, Thunder Sub or any of their subsidiaries other than EVgo OpCo and its subsidiaries (“Company Group”) to the TRA Holders of 85% of the net cash savings, if any, in U.S. federal, state and local income tax and franchise tax that the Company actually realizes (or is deemed to realize in certain circumstances) as a result of (i) certain increases in tax basis that occur as a result of the Company Group’s acquisition (or deemed acquisition for U.S. federal income tax purposes) of all or a portion of EVgo OpCo Units pursuant to any exercise of the Redemption Right and (ii) imputed interest deemed to be paid by the Company as a result of, and additional tax basis arising from, any payments the Company makes under the Tax Receivable Agreement. The Company Group will retain the benefit of any remaining net cash savings. If the Company Group elects to terminate the Tax Receivable Agreement early (or it is terminated early due to the Company Group’s failure to honor a material obligation thereunder or due to certain mergers, asset sales, other forms of business combinations or other changes of control), the Company Group is required to make an immediate payment equal to the present value of the anticipated future payments to be made by it under the Tax Receivable Agreement (based upon certain assumptions and deemed events set forth in the Tax Receivable Agreement, including (i) that the Company Group has sufficient taxable income on a current basis to fully utilize the tax benefits covered by the Tax Receivable Agreement and (ii) that any EVgo OpCo Units (other than those held by the Company Group) outstanding on the termination date or change of control date, as applicable, are deemed to be redeemed on such date). The redemption of EVgo OpCo Units that occurred in December 2024 is expected to produce favorable tax attributes for the Company. These tax attributes would not be available to the Company in the absence of the redemption. Amounts payable by the Company under the Tax Receivable Agreement are initially accrued against additional paid-in capital when it is probable that a liability has been incurred and the amount is estimable. Any subsequent changes to the liability are recorded as non-operating income (loss). If the liability is considered probable and estimable and is established for the first time as part of a reversal of a valuation allowance against deferred tax assets, the initial liability is accrued through non-operating income (loss). As of June 30, 2026, the Company does not expect any cash tax benefit from the tax attributes produced by the redemption and therefore no amounts have been accrued as the liability is not deemed probable. The potential unrecorded tax liability related to the redemption is $33.8 million as of June 30, 2026.

In connection with the CRIS Business Combination, EVgo entered into a tax receivable agreement (the “Tax Receivable Agreement”) with EVgo Holdings (along with permitted assigns, the “TRA Holders”) and LS Power Equity Advisors, LLC, as agent. The Tax Receivable Agreement generally provides for payment by the Company, Thunder Sub or any of their subsidiaries other than EVgo OpCo and its subsidiaries (“Company Group”) to the TRA Holders of 85% of the net cash savings, if any, in U.S. federal, state and local income tax and franchise tax that the Company actually realizes (or is deemed to realize in certain circumstances) as a result of (i) certain increases in tax basis that occur as a result of the Company Group’s acquisition (or deemed acquisition for U.S. federal income tax purposes) of all or a portion of EVgo OpCo Units pursuant to any exercise of the Redemption Right and (ii) imputed interest deemed to be paid by the Company as a result of, and additional tax basis arising from, any payments the Company makes under the Tax Receivable Agreement. The Company Group will retain the benefit of any remaining net cash savings. If the Company Group elects to terminate the Tax Receivable Agreement early (or it is terminated early due to the Company Group’s failure to honor a material obligation thereunder or due to certain mergers, asset sales, other forms of business combinations or other changes of control), the Company Group is required to make an immediate payment equal to the present value of the anticipated future payments to be made by it under the Tax Receivable Agreement (based upon certain assumptions and deemed events set forth in the Tax Receivable Agreement, including (i) that the Company Group has sufficient taxable income on a current basis to fully utilize the tax benefits covered by the Tax Receivable Agreement and (ii) that any EVgo OpCo Units (other than those held by the Company Group) outstanding on the termination date or change of control date, as applicable, are deemed to be redeemed on such date).

The redemption of EVgo OpCo Units that occurred in December 2024 is expected to produce favorable tax attributes for the Company. These tax attributes would not be available to the Company in the absence of the redemption. Amounts payable by the Company under the Tax Receivable Agreement are initially accrued against additional paid-in capital when it is probable that a liability has been incurred and the amount is estimable. Any subsequent changes to the liability are recorded as non-operating income (loss). If the liability is considered probable and estimable and is established for the first time as part of a reversal of a valuation allowance against deferred tax assets, the initial liability is accrued through non-operating income (loss).