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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2024
Income Tax Disclosure [Abstract]  
Effective Income Tax Rate Reconciliation
The effective income tax rate varies from the U.S. federal statutory rate principally due to the following:
Three Months Ended September 30,Nine Months Ended September 30,
2024
2023
2024
2023
U.S. federal statutory rate21.0 %21.0 %21.0 %21.0 %
(Decrease) increase due to:
State income taxes, net of federal income tax benefit4.8 4.3 1.1 4.1 
Qualified NDT fund income and losses8.2 (2.6)6.6 4.7 
Amortization of ITC, including deferred taxes on basis differences(0.3)(0.5)(0.2)(0.5)
PTCs and other credits(8.1)(0.6)(8.1)(0.6)
Noncontrolling interests0.1 0.7 0.1 0.3 
Other1.6 0.6 0.5 0.4 
Effective income tax rate27.3 %22.9 %21.0 %29.4 %