BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents		$ 844	$ 834
Accounts receivable, net		74,190	71,166
Accounts receivable from affiliates		949	1,079
Accrued unbilled revenues		119,418	103,781
Inventories		38,505	37,546
Regulatory assets		38,721	31,541
Derivative instruments		5,114	12,952
Prepaid taxes		21,779	35,666
Prepayments and other		7,855	20,520
Total current assets		307,375	315,085
Property, plant and equipment, net		4,695,819	4,348,823
Other assets
Regulatory assets		346,683	301,814
Derivative instruments		22,113	25,272
Other		7,477	3,449
Total other assets		376,273	330,535
Total assets		5,379,467	4,994,443
Current liabilities
Current portion of long-term debt		0	200,000
Short-term debt		50,000	15,000
Accounts payable		176,157	146,794
Accounts payable to affiliates		14,414	29,135
Regulatory liabilities	[1]	41,577	98,305
Taxes accrued		39,742	33,374
Accrued interest		19,162	17,781
Dividends payable		30,870	12,538
Derivative instruments		3,565	3,565
Other		29,703	35,654
Total current liabilities		405,190	592,146
Deferred credits and other liabilities
Deferred income taxes		989,137	860,744
Regulatory liabilities		233,454	229,584
Asset retirement obligations		28,663	27,233
Derivative instruments		23,513	27,078
Pension and employee benefit obligations		107,872	93,346
Other		24,084	17,841
Total deferred credits and other liabilities		1,406,723	1,255,826
Commitments and contingencies
Capitalization
Long-term debt		1,635,858	1,338,522
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at Dec. 31, 2016 and 2015, respectively		0	0
Additional paid in capital		1,446,223	1,371,223
Retained earnings		486,763	438,007
Accumulated other comprehensive loss		(1,290)	(1,281)
Total common stockholder’s equity		1,931,696	1,807,949
Total liabilities and equity		$ 5,379,467	$ 4,994,443

[1] (b) Revenue subject to refund of $0 million and $3.9 million for 2016 and 2015, respectively, is included in other current liabilities.