Balance Sheet (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash	$ 154	$ 133
Receivables:
Trade	42,759	42,776
Affiliated companies	2,039	40,427
Advances to affiliate	135,054	119,168
Other	1,249	1,627
Materials and supplies	10,066	10,269
Exchange gas due from others	4,184	2,751
Prepayments and other	4,881	3,555
Total current assets	200,386	220,706
PROPERTY, PLANT AND EQUIPMENT, at cost	3,269,617	3,205,576
Less-Accumulated depreciation	1,288,530	1,220,737
Total property, plant and equipment, net	1,981,087	1,984,839
OTHER ASSETS:
Deferred charges	4,700	6,408
Regulatory assets	49,923	58,141
Total other assets	54,623	64,549
Total assets	2,236,096	2,270,094
Payables:
Trade	12,709	24,013
Affiliated companies	13,143	11,136
Accrued liabilities:
Taxes, other than income taxes	11,246	10,974
Interest	4,045	4,045
Exchange gas due to others	6,406	5,847
Exchange gas offset	3,941	572
Customer advances	2,363	6,371
Other	1,799	1,965
Total current liabilities	55,652	64,923
LONG-TERM DEBT	694,420	694,224
OTHER NONCURRENT LIABILITIES:
Asset retirement obligations	94,678	60,753
Regulatory liabilities	23,375	19,252
Other	8,017	7,479
Total other noncurrent liabilities	126,070	87,484
CONTINGENT LIABILITIES AND COMMITMENTS (Note 3)
OWNER'S EQUITY:
Owner's capital	1,073,892	1,073,892
Retained earnings	285,972	349,419
Accumulated other comprehensive income	90	152
Total owner's equity	1,359,954	1,423,463
Total liabilities and owner's equity	$ 2,236,096	$ 2,270,094