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Income Taxes:
 9 Months Ended
Sep. 30, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Income Tax Expense (Benefit) and Effective Tax Rates

Three Months Ended September 30, 2022 Compared to the Three Months Ended September 30, 2021

Income tax expense for the three months ended September 30, 2022 was $2.1 million compared to $5.3 million for the same period in 2021. For the three months ended September 30, 2022 the effective tax rate was 5.2% compared to 9.8% for the same period in 2021. The lower effective tax rate was primarily due to tax benefits from state rate changes.

Nine Months Ended September 30, 2022 Compared to the Nine Months Ended September 30, 2021

Income tax expense for the nine months ended September 30, 2022 was $16 million compared to $6.3 million for the same period in 2021. For the nine months ended September 30, 2022, the effective tax rate was 7.6% compared to 3.5% for the same period in 2021. The higher effective tax rate was primarily due to $10 million of prior year tax benefits from Colorado Electric and Nebraska Gas TCJA-related bill credits to customers (which were offset by reduced revenue) partially offset by $3.4 million of tax benefits from state rate changes and $2.0 million of increased tax benefits from federal PTCs associated with increased wind production and a current year PTC rate increase (inflation adjustment).