CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Revenues	$ 2,174,264	$ 2,263,228	$ 5,971,665	$ 7,500,761
Cost of sales and fuel (exclusive of items shown separately below)	1,265,674	1,414,528	3,483,060	4,996,699
Operations and maintenance	173,548	218,305	538,782	632,332
Depreciation and amortization	153,245	121,430	426,014	350,552
Impairment charges (Note A)	0	0	604,024	0
General taxes	31,381	26,830	97,651	91,257
(Gain) loss on sale of assets	(17)	(16)	(560)	2,882
Operating income	550,433	482,151	822,694	1,427,039
Equity in net earnings from investments (Note I)	38,046	37,576	108,001	115,175
Impairment of equity investments (Note A)	0	0	(37,730)	0
Allowance for equity funds used during construction	3,084	15,792	22,347	45,175
Other income	8,175	6,643	34,390	21,685
Other expense	(4,496)	(6,065)	(14,667)	(14,024)
Interest expense (net of capitalized interest of $13,821, $27,610, $61,439 and $73,601, respectively)	(176,371)	(129,577)	(535,955)	(362,490)
Income before income taxes	418,871	406,520	399,080	1,232,560
Income taxes	(106,555)	(97,365)	(94,300)	(274,234)
Net income	312,316	309,155	304,780	958,326
Less: Preferred stock dividends	275	275	825	825
Net income available to common shareholders	$ 312,041	$ 308,880	$ 303,955	$ 957,501
Basic earnings per common share (Note G)	$ 0.70	$ 0.75	$ 0.71	$ 2.32
Diluted earnings per common share (Note G)	$ 0.70	$ 0.74	$ 0.71	$ 2.31
Average shares (thousands)
Basic	445,103	413,816	426,369	413,443
Diluted	445,510	415,578	426,997	415,277
Commodity Sales
Revenues
Revenues	$ 1,852,198	$ 1,947,834	$ 5,004,375	$ 6,567,634
Services
Revenues
Revenues	$ 322,066	$ 315,394	$ 967,290	$ 933,127