Consolidated Statements of Income (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Revenues	$ 1,137,366	$ 1,169,539	$ 1,381,260
Costs and expenses:
Cost of sales - gas, fuel and purchased power (excluding depreciation shown below)	678,500	730,502	944,793
Operating and administrative expenses	176,922	169,464	191,263
Operating and administrative expenses - related parties	12,125	14,209	14,964
Taxes other than income taxes	16,616	18,638	16,917
Depreciation	49,917	50,747	48,873
Amortization	2,629	2,729	2,239
Other income, net	(10,764)	(6,269)	(7,261)
Total costs and expenses	925,945	980,020	1,211,788
Operating income	211,421	189,519	169,472
Interest expense	42,728	42,336	43,918
Income before income taxes	168,693	147,183	125,554
Income taxes	63,497	56,925	46,832
Net income	$ 105,196	$ 90,258	$ 78,722