BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 1,011	$ 482
Accounts receivable, net	70,951	62,067
Accounts receivable from affiliates	15,840	4,791
Accrued unbilled revenues	109,207	98,892
Inventories	37,138	31,337
Regulatory assets	27,595	24,020
Derivative instruments	17,826	7,892
Deferred income taxes	85,362	27,528
Prepayments and other	19,571	11,387
Total current assets	384,501	268,396
Property, plant and equipment, net	3,284,030	2,861,756
Other assets
Regulatory assets	290,415	324,081
Derivative instruments	41,056	48,949
Other	17,068	14,759
Total other assets	348,539	387,789
Total assets	4,017,070	3,517,941
Current liabilities
Short-term debt	84,000	9,000
Borrowings under utility money pool arrangement	38,000	0
Accounts payable	143,879	141,327
Accounts payable to affiliates	15,387	12,363
Regulatory liabilities	83,759	75,891
Taxes accrued	23,584	19,380
Accrued interest	16,883	15,104
Dividends payable	18,082	16,773
Derivative instruments	3,583	3,601
Other	75,355	31,084
Total current liabilities	502,512	324,523
Deferred credits and other liabilities
Deferred income taxes	757,778	662,201
Regulatory liabilities	81,504	91,815
Asset retirement obligations	19,375	17,607
Derivative instruments	34,207	37,790
Pension and employee benefit obligations	55,087	97,273
Other	3,051	6,093
Total deferred credits and other liabilities	951,002	912,779
Commitments and Contingencies
Capitalization
Long-term debt	1,199,865	1,103,684
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at Dec. 31, 2013 and 2012, respectively	0	0
Additional paid in capital	1,005,463	843,186
Retained earnings	359,389	335,101
Accumulated other comprehensive loss	(1,161)	(1,332)
Total common stockholder’s equity	1,363,691	1,176,955
Total liabilities and equity	$ 4,017,070	$ 3,517,941