Balance Sheet (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash	$ 117	$ 37
Receivables:
Trade	39,836	37,352
Affiliated companies	1,683	2,250
Advances to affiliate	29,322	52,024
Other	6,700	893
Materials and supplies, less reserves of $81 at December 31, 2012 and $816 at December 31, 2011	10,137	10,488
Exchange gas due from others	3,426	3,441
Exchange gas offset	1,277	0
Prepayments and other	3,353	3,469
Total current assets	95,851	109,954
PROPERTY, PLANT AND EQUIPMENT, at cost	3,163,489	3,068,915
Less-Accumulated depreciation	1,159,944	1,076,943
Total property, plant and equipment, net	2,003,545	1,991,972
OTHER ASSETS:
Deferred charges	7,918	10,250
Regulatory assets	60,298	59,605
Total other assets	68,216	69,855
Total assets	2,167,612	2,171,781
Payables:
Trade	18,383	13,634
Affiliated companies	10,912	8,812
Accrued liabilities:
Taxes, other than income taxes	10,961	10,252
Interest	4,045	4,045
Exchange gas due to others	6,572	10,472
Exchange gas offset	0	2,241
Other	4,467	5,006
Total current liabilities	55,340	54,462
LONG-TERM DEBT	694,027	693,831
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES	90,007	103,041
CONTINGENT LIABILITIES AND COMMITMENTS (Note 3)
OWNER'S EQUITY:
Owner's capital	1,060,592	1,051,962
Retained earnings	267,432	268,209
Accumulated other comprehensive income	214	276
Total owner's equity	1,328,238	1,320,447
Total liabilities and owner's equity	$ 2,167,612	$ 2,171,781