BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 596	$ 1,011
Accounts receivable, net	71,626	70,951
Accounts receivable from affiliates	1,983	15,840
Accrued unbilled revenues	129,287	109,207
Inventories	43,231	37,138
Regulatory assets	52,006	27,595
Derivative instruments	23,776	17,826
Deferred income taxes	51,854	85,362
Prepayments and other	31,476	19,571
Total current assets	405,835	384,501
Property, plant and equipment, net	3,743,141	3,284,030
Other assets
Regulatory assets	323,305	290,415
Derivative instruments	33,164	41,056
Other	15,859	17,068
Total other assets	372,328	348,539
Total assets	4,521,304	4,017,070
Current liabilities
Short-term debt	37,000	84,000
Borrowings under utility money pool arrangement	16,000	38,000
Accounts payable	160,762	143,879
Accounts payable to affiliates	19,790	15,387
Regulatory liabilities	87,723	83,759
Taxes accrued	27,208	23,584
Accrued interest	17,057	16,883
Dividends payable	27,828	18,082
Derivative instruments	3,565	3,583
Other	80,211	75,355
Total current liabilities	477,144	502,512
Deferred credits and other liabilities
Deferred income taxes	849,145	757,778
Regulatory liabilities	115,188	81,504
Asset retirement obligations	26,031	19,375
Derivative instruments	30,643	34,207
Pension and employee benefit obligations	103,670	55,087
Other	9,320	3,051
Total deferred credits and other liabilities	1,133,997	951,002
Commitments and Contingencies
Capitalization
Long-term debt	1,349,691	1,199,865
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at Dec. 31, 2014 and 2013, respectively	0	0
Additional paid in capital	1,165,463	1,005,463
Retained earnings	395,998	359,389
Accumulated other comprehensive loss	(989)	(1,161)
Total common stockholder’s equity	1,560,472	1,363,691
Total liabilities and equity	$ 4,521,304	$ 4,017,070