CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Operating Revenues:
Utility revenues	$ 292,085	$ 301,551	$ 990,860	$ 1,059,221
Non-utility revenues	48,547	42,159	145,614	121,632
Total operating revenues	340,632	343,710	1,136,474	1,180,853
Utility operating expenses:
Resource costs	153,801	171,393	500,805	575,290
Other operating expenses	64,449	60,579	191,407	188,961
Depreciation and amortization	28,255	26,341	83,327	78,600
Taxes other than income taxes	18,090	16,829	63,622	61,521
Non-utility operating expenses:
Other operating expenses	42,647	31,726	130,327	95,581
Depreciation and amortization	3,391	1,964	9,966	5,673
Total operating expenses	310,633	308,832	979,454	1,005,626
Income from operations	29,999	34,878	157,020	175,227
Interest expense	19,128	18,703	57,453	55,415
Interest expense to affiliated trusts	136	152	413	455
Capitalized interest	(644)	(957)	(1,765)	(2,209)
Other expense-net	3,809	1,626	5,106	3,061
Income before income taxes	7,570	15,354	95,813	118,505
Income tax expense	1,608	3,717	33,106	40,937
Net income	5,962	11,637	62,707	77,568
Net income attributable to noncontrolling interests	(176)	(935)	(355)	(1,947)
Net income attributable to Avista Corporation	$ 5,786	$ 10,702	$ 62,352	$ 75,621
Weighted-average common shares outstanding (thousands), basic	59,047	58,057	58,778	57,731
Weighted-average common shares outstanding (thousands), diluted	59,123	58,232	59,026	57,934
Earnings per common share attributable to Avista Corporation:
Basic	$ 0.10	$ 0.18	$ 1.06	$ 1.31
Diluted	$ 0.10	$ 0.18	$ 1.06	$ 1.30
Dividends paid per common share	$ 0.290	$ 0.275	$ 0.870	$ 0.825