CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 21,089	$ 5,150
Accounts receivable, net	328,675	277,461
Accounts receivable from affiliates	19,136	93,544
Investments in utility money pool arrangement	72,000	0
Accrued unbilled revenues	270,917	285,624
Inventories	238,007	223,794
Regulatory assets	150,163	143,689
Deferred income taxes	87,267	0
Derivative instruments	6,576	4,889
Prepayments and other	32,629	22,970
Total current assets	1,226,459	1,057,121
Property, plant and equipment, net	10,742,397	10,030,991
Other assets
Regulatory assets	826,037	934,728
Derivative instruments	6,905	10,868
Other	52,520	50,461
Total other assets	885,462	996,057
Total assets	12,854,318	12,084,169
Current liabilities
Current portion of long-term debt	282,143	256,297
Short-term debt	0	154,000
Accounts payable	451,243	359,969
Accounts payable to affiliates	45,902	30,001
Regulatory liabilities	79,499	33,723
Taxes accrued	154,194	153,614
Accrued interest	48,492	48,014
Dividends payable to parent	65,134	66,803
Derivative instruments	6,734	8,753
Other	89,571	72,669
Total current liabilities	1,222,912	1,183,843
Deferred credits and other liabilities
Deferred income taxes	2,206,179	1,782,828
Deferred investment tax credits	39,230	42,097
Regulatory liabilities	424,690	417,404
Asset retirement obligations	60,398	43,751
Derivative instruments	23,366	30,605
Customer advances	251,062	229,498
Pension and employee benefit obligations	167,127	324,625
Other	66,855	69,307
Total deferred credits and other liabilities	3,238,907	2,940,115
Commitments and contingencies
Capitalization
Long-term debt	3,590,500	3,374,476
Common stock — 100 shares authorized of $0.01 par value; 100 shares outstanding at Dec. 31, 2013 and 2012, respectively	0	0
Additional paid in capital	3,441,290	3,415,669
Retained earnings	1,384,047	1,192,937
Accumulated other comprehensive loss	(23,338)	(22,871)
Total common stockholder’s equity	4,801,999	4,585,735
Total liabilities and equity	$ 12,854,318	$ 12,084,169