Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
UTILITY PLANT:
Utility plant in service	$ 4,931,260	$ 4,658,023
Less accumulated depreciation	2,298,634	2,264,606
Utility plant in service - net	2,632,626	2,393,417
Construction work in progress	601,234	447,399
Spare parts inventory	13,903	14,816
Property held for future use	1,002	1,002
Utility plant - net	3,248,765	2,856,634
OTHER ASSETS:
Nonutility property - at cost, less accumulated depreciation	518	522
Other long-term assets	6,404	6,221
Other assets - net	6,922	6,743
CURRENT ASSETS:
Cash and cash equivalents	125,238	26,933
Accounts receivable and unbilled revenue (less allowance for doubtful accounts of $2,445 and $2,076, respectively)	135,442	139,709
Fuel inventories - at average cost	66,772	47,550
Materials and supplies - at average cost	61,715	60,185
Deferred tax asset - current	40,856	61,782
Regulatory assets	4,212	93
Prepayments and other current assets	28,657	23,161
Total current assets	462,892	359,413
DEFERRED DEBITS:
Regulatory assets	430,756	419,193
Miscellaneous	28,755	25,835
Total deferred debits	459,511	445,028
TOTAL	4,178,090	3,667,818
Common shareholders' equity:
Paid in capital	383,314	168,610
Accumulated deficit	(35,328)	(17,339)
Total common shareholders' equity	347,986	151,271
Cumulative preferred stock of subsidiary	59,784	59,784
Long-term debt	2,083,815	1,951,013
Total capitalization	2,491,585	2,162,068
CURRENT LIABILITIES:
Short-term and current portion of long-term debt	181,850	50,000
Accounts payable	145,658	110,623
Accrued expenses	22,471	25,187
Accrued real estate and personal property taxes	22,434	19,177
Regulatory liabilities	32,636	27,943
Accrued interest	39,469	30,726
Customer deposits	29,737	28,337
Other current liabilities	11,816	12,881
Total current liabilities	486,071	304,874
DEFERRED CREDITS AND OTHER LONG-TERM LIABILITIES:
Regulatory liabilities	632,159	610,917
Deferred income taxes - net	429,476	421,127
Non-current income tax liability	7,241	7,042
Unamortized investment tax credit	4,240	5,229
Accrued pension and other postretirement benefits	66,478	96,464
Asset retirement obligations	59,972	59,098
Miscellaneous	868	999
Total deferred credits and other long-term liabilities	$ 1,200,434	$ 1,200,876
COMMITMENTS AND CONTINGENCIES
TOTAL	$ 4,178,090	$ 3,667,818