Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 4,707	$ 1,259
Restricted cash	3,181	0
Accounts receivable (less allowances for doubtful accounts of $5,519 and $3,588, respectively)	53,341	47,362
Accounts receivable — related parties	3,497	4,571
Accrued utility revenues	18,868	16,911
Inventories	89,661	67,334
Deferred income taxes	14,165	19,430
Income taxes recoverable	0	9,461
Regulatory assets	8,217	6,473
Derivative financial instruments	43	5,468
Prepaid expenses & other current assets	15,862	19,852
Total current assets	211,542	198,121
Property, plant and equipment	2,427,810	2,295,669
Less accumulated depreciation and amortization	(853,675)	(815,720)
Net property, plant and equipment	1,574,135	1,479,949
Goodwill	182,145	182,145
Regulatory assets	236,694	331,932
Other assets	5,806	4,026
Total assets	2,210,322	2,196,173
Current liabilities:
Current maturities of long-term debt	0	133,000
Bank loans	17,500	9,200
Accounts payable — trade	51,970	46,754
Accounts payable — related parties	12,487	10,192
Employee compensation and benefits accrued	13,664	10,902
Interest accrued	11,281	22,766
Customer deposits and advances	40,307	49,806
Derivative financial instruments	6,677	36,011
Deferred fuel refunds	8,283	4,435
Pension and postretirement benefit obligations	17,885	15,802
Other current liabilities	27,459	31,816
Total current liabilities	207,513	370,684
Long-term debt	642,000	467,000
Deferred income taxes	436,810	390,046
Deferred investment tax credits	4,270	4,612
Pension and other postretirement benefit obligations	72,505	179,056
Other noncurrent liabilities	55,610	56,262
Total liabilities	1,418,708	1,467,660
Commitments and contingencies (Note 12)
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
Additional paid-in capital	470,098	468,692
Retained earnings	269,977	229,379
Accumulated other comprehensive loss	(8,720)	(29,817)
Total common stockholder’s equity	791,614	728,513
Total liabilities and stockholder’s equity	$ 2,210,322	$ 2,196,173