Balance Sheet (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
CURRENT ASSETS:
Cash	$ 37	$ 5
Receivables:
Trade	38,245	38,515
Affiliated companies	2,250	2,118
Advances to affiliate	52,024	45,045
Materials and supplies, less reserves of $816 at December 31, 2011 and $613 at December 31, 2010	10,488	11,719
Exchange gas due from others	3,441	2,323
Exchange gas offset	0	3,854
Prepayments and other	3,469	3,415
Total current assets	109,954	106,994
PROPERTY, PLANT AND EQUIPMENT, at cost	3,068,915	2,965,097
Less-Accumulated depreciation	1,076,943	1,017,634
Total property, plant and equipment, net	1,991,972	1,947,463
OTHER ASSETS:
Deferred charges	10,250	11,817
Regulatory assets	59,605	60,176
Total other assets	69,855	71,993
Total assets	2,171,781	2,126,450
Payables:
Trade	13,634	13,177
Affiliated companies	8,812	10,105
Accrued liabilities:
Taxes, other than income taxes	10,252	10,186
Interest	4,045	4,045
Exchange gas due to others	10,472	13,115
Exchange gas offset	2,241	0
Other	5,006	4,245
Total current liabilities	54,462	54,873
LONG-TERM DEBT	693,831	693,634
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES	103,041	88,347
CONTINGENT LIABILITIES AND COMMITMENTS (Note 2)
OWNER'S EQUITY:
Owner's capital	1,051,962	1,046,862
Loans (to) from affiliate	0	0
Retained earnings	268,209	242,396
Accumulated other comprehensive income	276	338
Total owner's equity	1,320,447	1,289,596
Total liabilities and owner's equity	$ 2,171,781	$ 2,126,450