Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Sep. 30, 2010	Jun. 30, 2010
Current assets:
Cash and cash equivalents	$ 108,914	$ 4,318	$ 38,055
Restricted cash	4,055	4,698	3,639
Accounts receivable (less allowances for doubtful accounts of $12,927, $7,072 and $17,297, respectively)	87,858	64,844	90,280
Accounts receivable - related parties	4,277	6,313	4,395
Accrued utility revenues	7,417	13,988	9,736
Inventories	58,751	118,858	67,611
Deferred income taxes	32,302	19,431	21,483
Regulatory assets	2,037	26,100	6,316
Derivative financial instruments	329	486	612
Prepaid expenses & other current assets	15,490	21,117	18,450
Total current assets	321,430	280,153	260,577
Property, plant and equipment, at cost (less accumulated depreciation and amortization of $766,533, $734,739 and $727,484, respectively)	1,404,250	1,394,585	1,369,530
Goodwill	180,145	180,145	180,145
Regulatory assets	244,061	280,602	135,397
Other assets	8,678	4,091	4,205
Total assets	2,158,564	2,139,576	1,949,854
Current liabilities:
Bank loans	0	17,000	0
Accounts payable	41,487	61,297	49,500
Accounts payable - related parties	9,260	8,144	6,039
Deferred fuel refunds	22,451	8,295	16,576
Derivative financial instruments	5,334	10,564	828
Other current liabilities	142,797	133,935	110,360
Total current liabilities	221,329	239,235	183,303
Long-term debt	640,000	640,000	640,000
Deferred income taxes	327,039	281,101	222,568
Deferred investment tax credits	5,046	5,311	5,400
Pension and postretirement benefit obligations	113,235	161,338	143,987
Other noncurrent liabilities	69,898	78,137	70,797
Total liabilities	1,376,547	1,405,122	1,266,055
Commitments and contingencies (note 9)
Common stockholder's equity:
Common Stock, $2.25 par value (authorized - 40,000,000 shares; issued and outstanding - 26,781,785 shares)	60,259	60,259	60,259
Additional paid-in capital	468,323	467,631	467,571
Retained earnings	259,307	217,960	235,955
Accumulated other comprehensive loss	(5,872)	(11,396)	(79,986)
Total common stockholder's equity	782,017	734,454	683,799
Total liabilities and stockholder's equity	$ 2,158,564	$ 2,139,576	$ 1,949,854