BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 2,004	$ 1,011
Accounts receivable, net	67,734	70,951
Accounts receivable from affiliates	6,531	15,840
Accrued unbilled revenues	111,620	109,207
Inventories	32,007	37,138
Regulatory assets	30,416	27,595
Derivative instruments	13,684	17,826
Deferred income taxes	69,655	85,362
Prepayments and other	35,026	19,571
Total current assets	368,677	384,501
Property, plant and equipment, net	3,395,274	3,284,030
Other assets
Regulatory assets	282,654	290,415
Derivative instruments	39,083	41,056
Other	14,671	17,068
Total other assets	336,408	348,539
Total assets	4,100,359	4,017,070
Current liabilities
Short-term debt	69,000	84,000
Borrowings under utility money pool arrangement	100,000	38,000
Accounts payable	162,544	143,879
Accounts payable to affiliates	13,809	15,387
Regulatory liabilities	60,633	83,759
Taxes accrued	16,262	23,584
Accrued interest	25,853	16,883
Dividends payable	18,181	18,082
Derivative instruments	3,574	3,583
Other	77,036	75,355
Total current liabilities	546,892	502,512
Deferred credits and other liabilities
Deferred income taxes	765,720	757,778
Regulatory liabilities	74,258	81,504
Asset retirement obligations	19,644	19,375
Derivative instruments	33,316	34,207
Pension and employee benefit obligations	51,574	55,087
Other	4,730	3,051
Total deferred credits and other liabilities	949,242	951,002
Commitments and contingencies
Capitalization
Long-term debt	1,199,937	1,199,865
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at March 31, 2014 and Dec. 31, 2013, respectively	0	0
Additional paid in capital	1,045,463	1,005,463
Retained earnings	359,943	359,389
Accumulated other comprehensive loss	(1,118)	(1,161)
Total common stockholder’s equity	1,404,288	1,363,691
Total liabilities and equity	$ 4,100,359	$ 4,017,070