Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Operating Revenues:
Utility revenues	$ 301,551	$ 331,092	$ 1,059,221	$ 1,080,340
Non-utility revenues	42,159	36,080	121,632	103,980
Total operating revenues	343,710	367,172	1,180,853	1,184,320
Utility operating expenses:
Resource costs	171,393	201,113	575,290	628,864
Other operating expenses	60,579	59,961	188,961	174,044
Depreciation and amortization	26,341	24,918	78,600	73,890
Taxes other than income taxes	16,829	15,842	61,521	54,879
Non-utility operating expenses:
Other operating expenses	31,726	25,862	95,581	80,024
Depreciation and amortization	1,964	1,732	5,673	5,302
Total operating expenses	308,832	329,428	1,005,626	1,017,003
Income from operations	34,878	37,744	175,227	167,317
Interest expense	18,703	18,830	55,415	57,058
Interest expense to affiliated trusts	152	175	455	480
Capitalized interest	(957)	(432)	(2,209)	(1,126)
Other expense-net	1,626	807	3,061	3,475
Income before income taxes	15,354	18,364	118,505	107,430
Income tax expense	3,717	5,030	40,937	38,732
Net income	11,637	13,334	77,568	68,698
Less: Net income attributable to noncontrolling interests	(935)	(988)	(1,947)	(2,002)
Net income attributable to Avista Corporation	$ 10,702	$ 12,346	$ 75,621	$ 66,696
Weighted-average common shares outstanding (thousands), basic	58,057	55,616	57,731	55,175
Weighted-average common shares outstanding (thousands), diluted	58,232	55,801	57,934	55,384
Earnings per common share attributable to Avista Corporation:
Basic	$ 0.18	$ 0.22	$ 1.31	$ 1.21
Diluted	$ 0.18	$ 0.22	$ 1.30	$ 1.20
Dividends paid per common share	$ 0.275	$ 0.25	$ 0.825	$ 0.75