CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Operating Revenues	$ 3,215,645	$ 2,432,794	$ 9,259,596	$ 7,381,172
Operating Expenses:
Purchased Power, Fuel and Transmission	1,388,041	880,639	3,718,278	2,529,217
Operations and Maintenance	454,289	389,065	1,378,897	1,265,754
Depreciation	302,143	276,846	885,711	822,197
Amortization	111,287	45,236	418,644	158,860
Energy Efficiency Programs	162,545	143,796	498,708	460,814
Taxes Other Than Income Taxes	240,047	213,881	683,441	623,827
Total Operating Expenses	2,658,352	1,949,463	7,583,679	5,860,669
Operating Income/(Loss)	557,293	483,331	1,675,917	1,520,503
Interest Expense	178,174	147,962	491,509	431,162
Other Income, Net	89,831	43,768	255,253	124,588
Income Before Income Tax Expense	468,950	379,137	1,439,661	1,213,929
Income Tax Expense	117,661	94,091	349,305	294,461
Net Income	351,289	285,046	1,090,356	919,468
Net Income Attributable to Noncontrolling Interests	1,880	1,880	5,639	5,639
Net Income Attributable to Common Shareholders	$ 349,409	$ 283,166	$ 1,084,717	$ 913,829
Basic EPS (in dollars per share)	$ 1.01	$ 0.82	$ 3.13	$ 2.66
Diluted EPS (in dollars per share)	$ 1.00	$ 0.82	$ 3.13	$ 2.65
Weighted Average Common Shares Outstanding:
Basic (in shares)	347,297,411	344,023,846	346,115,823	343,848,905
Diluted (in shares)	347,762,693	344,669,782	346,573,101	344,480,056