Income Taxes (Tables)

9 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Reconciliation between the statutory rate and ETR:

	Three Months Ended Sept. 30				Nine Months Ended Sept. 30
	2023		2022		2023		2022
Federal statutory rate	21.0	%	21.0	%	21.0	%	21.0	%
State tax (net of federal tax effect)	5.0		4.9		4.9		4.9
(Decreases) increases:
Wind PTCs (a)	(13.8)		(12.3)		(27.3)		(25.2)
Plant regulatory differences (b)	(5.3)		(5.8)		(5.5)		(5.5)
Other tax credits, net operating loss & tax credits allowances	(1.1)		(1.2)		(1.2)		(1.4)
Other (net)	(0.1)		(0.3)		0.1		(0.1)
Effective income tax rate	5.7	%	6.3	%	(8.0)	%	(6.3)	%

(a)Wind PTCs are credited to customers (reduction to revenue) and do not materially impact net income.

(b)Plant regulatory differences primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit are offset by corresponding revenue reductions.