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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Provision From Continuing Operations
The income tax provision consisted of the following amounts:
 Year Ended December 31,
 202420232022
 (In millions)
Current  
U.S. Federal$$(13)$— 
State(2)28 
Total — current(15)28 
Deferred   
U.S. Federal$22 $13 $150 
State— 44 
Total — deferred25 13 194 
Total income tax expense (benefit) $30 $(2)$222 
Schedule of Reconciliation of the U.S. Federal Statutory Rate to the Company's Effective Rate The following table is a reconciliation of the U.S. federal statutory rate of 21% to the Company’s effective rate for the year ended December 31, 2024 in accordance with the guidance in ASU No. 2023-09:
 Year Ended December 31,
 2024
 (In millions, except percentages)
Loss Before Income Taxes$(33)
Tax at 21%(7)21.0 %
State taxes, net of federal benefit (a)
(18.2)%
Tax credits(4)12.1 %
Nontaxable/nondeductible items:
HLBV impact32 (96.9)%
Employee share-based payments(6.0)%
Other (2.9)%
Income tax expense$30 (90.9)%
Effective income tax rate(90.9)%
(a) State taxes in California made up the majority of the tax effect in this category.
The following table is a reconciliation of the U.S. federal statutory rate of 21% to the Company’s effective rate for the years ended December 31, 2023 and 2022 in accordance with the guidance prior to the adoption of ASU 2023-09:
 Year Ended December 31,
 20232022
 (In millions, except percentages)
(Loss) Income Before Income Taxes$(16)$1,282 
Tax at 21%(3)269 
State taxes, net of federal benefit(2)58 
Impact of non-taxable partnership earnings (losses)21 (101)
Valuation allowance— 
Investment tax credits(1)— 
Production tax credits (a)
(16)(2)
Rate change(2)
State taxes assessed at subsidiaries(3)
Other (2)(2)
Income tax (benefit) expense$(2)$222 
Effective income tax rate12.5 %17.3 %
(a) On December 6, 2023, the Company executed an agreement with a third party to sell the PTCs generated by the Alta X and Alta XI wind facilities, which resulted in a $14 million income tax benefit (reduction to income tax expense) during the year ended December 31, 2023.
Schedule of Company's Deferred Tax Assets and Liabilities
The temporary differences, which gave rise to the Company’s deferred tax balances consisted of the following:
 As of December 31,
 20242023
 (In millions)
Deferred tax liabilities:
Investment in projects$191 $241 
Total deferred tax liabilities191 241 
Deferred tax assets: 
Interest expense disallowance carryforward - Investment in Projects$18 $17 
Production tax credits 16 15 
Investment tax credits
U.S. Federal net operating loss carryforwards58 73 
State net operating loss carryforwards
Total deferred tax assets106 118 
Valuation allowance(4)(4)
Total deferred tax assets, net of valuation allowance102 114 
Net deferred non-current tax liability$(89)$(127)