CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Electric	$ 1,106,565	$ 1,052,182	$ 940,815
Gas	371,272	320,134	257,855
Total Revenues	1,477,837	1,372,316	1,198,670
Utilities Operating Expense, Fuel Used	492,011	425,548	306,190
Operating Expenses
Operating and maintenance	221,427	208,303	202,991
Administrative and general	113,776	101,873	94,124
Property and other taxes	192,524	173,444	179,517
Depreciation and depletion	195,020	187,467	179,644
Total Operating Expenses	1,214,758	1,096,635	962,466
Operating Income	263,079	275,681	236,204
Interest Expense, net	(100,110)	(93,674)	(96,812)
Other Income, net	19,434	8,252	4,853
Income Before Income Taxes	182,403	190,259	144,245
Income Tax Benefit (Expense)	605	(3,419)	10,970
Net Income	$ 183,008	$ 186,840	$ 155,215
Average Common Shares Outstanding	55,769,156	51,709,229	50,559,208
Basic Earnings per Average Common Share	$ 3.28	$ 3.61	$ 3.07
Diluted Earnings per Average Common Share	$ 3.25	$ 3.60	$ 3.06