Balance Sheet (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash	$ 5	$ 37
Receivables:
Trade	38,964	38,245
Affiliated companies	9	2,250
Advances to affiliate	84,194	52,024
Materials and supplies, less reserves of $109 at March 31, 2012 and $816 at December 31, 2011	10,211	10,488
Exchange gas due from others	1,609	3,441
Prepayments and other	2,982	3,469
Total current assets	137,974	109,954
PROPERTY, PLANT AND EQUIPMENT, at cost	3,084,554	3,068,915
Less-Accumulated depreciation	1,107,898	1,076,943
Total property, plant and equipment, net	1,976,656	1,991,972
OTHER ASSETS:
Deferred charges	9,373	10,250
Regulatory assets	59,570	59,605
Total other assets	68,943	69,855
Total assets	2,183,573	2,171,781
Payables:
Trade	5,041	13,634
Affiliated companies	9,619	8,812
Accrued liabilities:
Taxes, other than income taxes	13,688	10,252
Interest	15,155	4,045
Exchange gas due to others	3,436	10,472
Exchange gas offset	1,782	2,241
Other	4,807	5,006
Total current liabilities	53,528	54,462
LONG-TERM DEBT	693,880	693,831
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES	104,196	103,041
CONTINGENT LIABILITIES AND COMMITMENTS (Note 3)
OWNER'S EQUITY:
Owner's capital	1,053,192	1,051,962
Retained earnings	278,517	268,209
Accumulated other comprehensive income	260	276
Total owner's equity	1,331,969	1,320,447
Total liabilities and owner's equity	$ 2,183,573	$ 2,171,781