Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Current assets:
Cash and cash equivalents	$ 3,099	$ 12,401
Restricted cash	6,602	3,592
Accounts receivable (less allowances for doubtful accounts of $5,599 and $6,992, respectively)	55,659	65,080
Accounts receivable — related parties	1,271	2,865
Accrued utility revenues	12,051	14,330
Inventories	51,716	95,219
Deferred income taxes	24,694	1,492
Income taxes receivable	10,026	0
Regulatory assets	4,105	13,159
Derivative instruments	934	1,028
Prepaid expenses	9,701	8,788
Other current assets	14,202	9,747
Total current assets	194,060	227,701
Property, plant and equipment	2,753,499	2,568,552
Less accumulated depreciation and amortization	(929,130)	(886,268)
Net property, plant and equipment	1,824,369	1,682,284
Goodwill	182,145	182,145
Regulatory assets	300,103	255,007
Other assets	7,501	7,506
Total assets	2,508,178	2,354,643
Current liabilities:
Current maturities of long-term debt	247,000	20,000
Short-term borrowings	71,700	86,300
Accounts payable — trade	58,135	58,453
Accounts payable — related parties	4,430	11,761
Employee compensation and benefits accrued	14,286	14,647
Interest accrued	8,553	8,908
Customer deposits and advances	41,646	40,401
Derivative instruments	12,591	1,632
Regulatory liability - deferred fuel and power refunds	36,638	306
Other current liabilities	38,780	35,074
Total current liabilities	533,759	277,482
Long-term debt	375,000	622,000
Deferred income taxes	512,497	461,461
Deferred investment tax credits	3,597	3,933
Pension and other postretirement benefit obligations	135,003	98,363
Other noncurrent liabilities	57,702	51,567
Total liabilities	$ 1,617,558	$ 1,514,806
Commitments and contingencies
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	471,904	471,071
Retained earnings	372,143	316,688
Accumulated other comprehensive loss	(13,686)	(8,181)
Total common stockholder’s equity	890,620	839,837
Total liabilities and stockholder’s equity	$ 2,508,178	$ 2,354,643