Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Current assets:
Cash and cash equivalents	$ 2,819	$ 3,099
Restricted cash	583	6,602
Accounts receivable (less allowances for doubtful accounts of $3,946 and $5,599, respectively)	44,692	55,659
Accounts receivable — related parties	398	1,271
Accrued utility revenues	12,753	12,051
Inventories	42,340	51,716
Deferred income taxes	0	24,694
Prepaid income taxes	1,956	10,026
Regulatory assets	3,208	4,105
Derivative instruments	4,263	934
Prepaid expenses	10,499	9,701
Other current assets	11,510	14,202
Total current assets	135,021	194,060
Property, plant and equipment	2,998,915	2,753,499
Less accumulated depreciation and amortization	(975,374)	(929,130)
Net property, plant and equipment	2,023,541	1,824,369
Goodwill	182,145	182,145
Regulatory assets	391,933	300,103
Other assets	10,451	5,307
Total assets	2,743,091	2,505,984
Current liabilities:
Current maturities of long-term debt	19,986	246,893
Short-term borrowings	112,500	71,700
Accounts payable — trade	65,180	58,135
Accounts payable — related parties	3,995	4,430
Employee compensation and benefits accrued	16,323	14,286
Interest accrued	7,605	8,553
Customer deposits and advances	41,391	41,646
Derivative instruments	310	12,591
Regulatory liability - deferred fuel and power refunds	22,299	36,638
Other current liabilities	44,321	38,780
Total current liabilities	333,910	533,652
Long-term debt	651,455	372,913
Deferred income taxes	550,229	512,497
Deferred investment tax credits	3,268	3,597
Pension and other postretirement benefit obligations	184,516	135,003
Other noncurrent liabilities	94,976	57,702
Total liabilities	1,818,354	1,615,364
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	473,580	471,904
Retained earnings	422,516	372,143
Accumulated other comprehensive loss	(31,618)	(13,686)
Total common stockholder’s equity	924,737	890,620
Total liabilities and stockholder’s equity	$ 2,743,091	$ 2,505,984