CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Utility revenues:
Utility revenues, exclusive of alternative revenue programs	$ 273,975	$ 288,826	$ 667,795	$ 682,067
Alternative revenue programs	4,362	9,725	(51)	5,067
Total utility revenues	278,337	298,551	667,744	687,134
Non-utility revenues	255	2,261	1,078	10,159
Total operating revenues	278,592	300,812	668,822	697,293
Utility operating expenses:
Resource costs	67,965	88,439	197,512	225,786
Other operating expenses	86,204	87,720	180,700	171,698
Merger transaction costs		11		19,675
Depreciation and amortization	63,908	55,479	115,329	104,393
Taxes other than income taxes	24,742	22,908	55,720	54,851
Non-utility operating expenses:
Other operating expenses	659	6,332	2,019	13,687
Depreciation and amortization	188	155	423	364
Total operating expenses	243,666	261,044	551,703	590,454
Income from operations	34,926	39,768	117,119	106,839
Interest expense	25,625	25,511	51,972	51,162
Interest expense to affiliated trusts	208	351	478	708
Capitalized interest	(972)	(1,101)	(1,970)	(2,029)
Merger termination fee				(103,000)
Other expense (income)-net	531	(8,268)	149	(9,175)
Income before income taxes	9,534	23,275	66,490	169,173
Income tax expense (benefit)	(7,919)	(1,741)	613	28,276
Net income	17,453	25,016	65,877	140,897
Net loss attributable to noncontrolling interests		(303)		(216)
Net income attributable to Avista Corp. shareholders	$ 17,453	$ 25,319	$ 65,877	$ 141,113
Weighted-average common shares outstanding (thousands), basic	67,481	65,894	67,360	65,814
Weighted-average common shares outstanding (thousands), diluted	67,589	65,963	67,485	65,883
Earnings per common share attributable to Avista Corp. shareholders:
Basic	$ 0.26	$ 0.38	$ 0.98	$ 2.14
Diluted	$ 0.26	$ 0.38	$ 0.98	$ 2.14