Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 5,203	$ 2,819
Restricted cash	3,046	583
Accounts receivable (less allowances for doubtful accounts of $4,052 and $3,946, respectively)	53,720	44,692
Accounts receivable — related parties	2,807	398
Accrued utility revenues	13,296	12,753
Inventories	53,309	42,340
Prepaid income taxes	7,711	1,956
Regulatory assets	8,338	3,208
Derivative instruments	1,354	4,263
Prepaid expenses	8,450	10,499
Other current assets	7,956	11,510
Total current assets	165,190	135,021
Property, plant and equipment	3,285,329	2,998,915
Less accumulated depreciation and amortization	(1,010,781)	(975,374)
Net property, plant and equipment	2,274,548	2,023,541
Goodwill	182,145	182,145
Regulatory assets	360,591	391,933
Other assets	11,541	10,451
Total assets	2,994,015	2,743,091
Current liabilities:
Current maturities of long-term debt	39,996	19,986
Short-term borrowings	170,000	112,500
Accounts payable — trade	71,559	65,180
Accounts payable — related parties	6,890	3,995
Employee compensation and benefits accrued	21,851	16,323
Interest accrued	16,200	7,605
Customer deposits and advances	35,278	41,391
Derivative instruments	1,071	310
Regulatory liability — deferred fuel and power refunds	10,621	22,299
Other current liabilities	40,016	44,321
Total current liabilities	413,482	333,910
Long-term debt	711,105	651,455
Deferred income taxes	635,465	550,229
Deferred investment tax credits	2,950	3,268
Pension and other postretirement benefit obligations	143,674	184,516
Other noncurrent liabilities	99,434	94,976
Total liabilities	2,006,110	1,818,354
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	473,580
Retained earnings	480,857	422,516
Accumulated other comprehensive loss	(26,791)	(31,618)
Total common stockholder’s equity	987,905	924,737
Total liabilities and stockholder’s equity	$ 2,994,015	$ 2,743,091