CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues
Electric	$ 279,468	$ 260,134	$ 614,951	$ 603,320
Gas	63,245	59,795	194,392	191,951
Total Revenues	342,713	319,929	809,343	795,271
Operating expenses
Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below)	75,271	76,480	213,468	251,201
Utilities Operating Expense, Maintenance and Operations	62,336	57,367	119,045	111,549
Administrative and general	33,773	31,281	75,130	71,726
Property and other taxes	48,168	36,256	91,408	83,427
Depreciation and depletion	62,379	56,933	124,779	113,676
Total Operating Expenses	281,927	258,317	623,830	631,579
Operating income	60,786	61,612	185,513	163,692
Interest expense, net	(36,254)	(31,875)	(72,765)	(62,854)
Other income, net	78	6,160	4,006	10,479
Income before income taxes	24,610	35,897	116,754	111,317
Income tax expense	(3,382)	(4,243)	(18,586)	(14,577)
Net Income	$ 21,228	$ 31,654	$ 98,168	$ 96,740
Average Common Shares Outstanding	61,380,777	61,288,870	61,360,252	61,277,418
Basic Earnings per Average Common Share	$ 0.35	$ 0.52	$ 1.60	$ 1.58
Diluted Earnings per Average Common Share	0.35	0.52	1.60	1.58
Dividends Declared per Common Share	$ 0.660	$ 0.65	$ 1.32	$ 1.300