CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Revenues	$ 3,388,964	$ 1,660,729	$ 6,583,643	$ 3,797,401
Cost of sales and fuel (exclusive of items shown separately below)	2,366,979	940,458	4,488,489	2,217,386
Operations and maintenance	212,319	190,138	419,477	365,234
Depreciation and amortization	156,921	140,416	314,041	272,769
Impairment charges	0	0	0	604,024
General taxes	41,940	34,326	86,379	66,270
Gain on sale of assets	(707)	(339)	(976)	(543)
Operating income	611,512	355,730	1,276,233	272,261
Equity in net earnings from investments (Note I)	25,720	25,328	59,040	69,955
Impairment of equity investments	0	0	0	(37,730)
Allowance for equity funds used during construction	426	3,854	1,238	19,263
Other income	7,005	17,693	7,220	34,168
Other expense	(7,498)	(6,176)	(12,735)	(18,124)
Interest expense (net of capitalized interest of $5,443, $16,473, $10,538 and $47,618, respectively)	(184,957)	(218,968)	(370,480)	(359,584)
Income (loss) before income taxes	452,208	177,461	960,516	(19,791)
Income tax (expense) benefit	(110,069)	(43,140)	(232,201)	12,255
Net income (loss)	342,139	134,321	728,315	(7,536)
Less: Preferred stock dividends	275	275	550	550
Net income (loss) available to common shareholders	$ 341,864	$ 134,046	$ 727,765	$ (8,086)
Basic earnings (loss) per common share (Note G)	$ 0.77	$ 0.32	$ 1.63	$ (0.02)
Diluted earnings (loss) per common share (Note G)	$ 0.77	$ 0.32	$ 1.63	$ (0.02)
Average shares (thousands)
Basic	446,337	419,722	446,116	417,002
Diluted	446,903	420,116	446,894	417,002
Commodity Sales
Revenues
Revenues	$ 3,074,773	$ 1,343,557	$ 5,910,882	$ 3,152,177
Services
Revenues
Revenues	$ 314,191	$ 317,172	$ 672,761	$ 645,224