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Income Taxes
3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
 On January 30, 2024, Pinnacle West entered into a tax credit transfer agreement to purchase from Ameresco $23.3 million of investment tax credits from the BCE Los Alamitos project for $21 million. See Note 14 for more information about the BCE Sale.

As a part of the Inflation Reduction Act of 2022 (“IRA”), a new PTC for nuclear energy produced by existing nuclear energy plants was enacted, available from 2024 through 2032. The Nuclear PTC can be increased by five times if certain IRS prevailing wages rules are met. The Company continues to await guidance from the U.S. Treasury Department related to the definition of “gross receipts” from nuclear sales for purposes of the credit phase-out applicable to the nuclear PTC. Without such guidance, the Company is unable to make a reasonable estimate of the potential benefit the nuclear PTC may provide. As a result, no income tax benefits have been recorded related to the nuclear PTC as of March 31, 2024.