Income Taxes (Tables)

9 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation of the statutory federal income tax rate to our effective tax rate for each of the three and nine months ended September 30, 2021 and 2020 is as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Federal Statutory Rate	21.0	%	21.0	%	21.0	%	21.0	%
Increases (Decreases) in Tax from:
State Taxes on Income, Net of Federal Tax	5.0		5.0		5.0		5.0
Production Tax Credits (PTCs)	(5.0)		—		(6.0)		—
Amortization of Excess Deferred Income Taxes	(1.6)		(2.9)		(2.0)		(3.4)
North Dakota Wind Tax Credit Amortization, Net of Federal Tax	(0.2)		(0.6)		(0.3)		(0.8)
Excess Tax Deduction on Stock Awards	—		0.3		—		(0.4)
Allowance for Equity Funds Used During Construction	(0.1)		(0.7)		(0.1)		(0.8)
Other, Net	(0.8)		(1.9)		(0.7)		(1.2)
Effective Tax Rate	18.3	%	20.2	%	16.9	%	19.4	%