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

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

Income tax expense (benefit) for the three months ended June 30, 2022 was $(0.7) million compared to $0.6 million reported for the same period in 2021. For the three months ended June 30, 2022 the effective tax rate was (1.9)% compared to 2.0% for the same period in 2021. The lower effective tax rate was primarily due to $3.8 million of tax benefits from state rate changes, $1.5 million of increased tax benefits from federal PTCs associated with increased wind production and a current year PTC rate increase (inflation adjustment). These current year tax benefits were greater than prior year tax benefits from Nebraska Gas TCJA-related bill credits to customers (which were offset by reduced revenue) and prior year flow-through tax benefits related to repairs and certain indirect costs.

Six Months Ended June 30, 2022 Compared to the Six Months Ended June 30, 2021

Income tax expense for the six months ended June 30, 2022 was $14 million compared to $1.1 million reported for the same period in 2021. For the six months ended June 30, 2022, the effective tax rate was 8.1% compared to 0.8% 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 $3.8 million of current year tax benefits from state rate changes and $2.4 million of increased tax benefits from federal PTCs associated with increased wind production and a current year PTC rate increase (inflation adjustment).