Balance Sheet (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash	$ 0	$ 0
Receivables:
Trade	37,283	37,365
Affiliated companies	60	51
Advances to affiliate	265,719	247,869
Other	765	840
Materials and supplies	9,849	9,807
Exchange gas due from others	3,276	4,466
Prepayments and other	3,396	4,078
Total current assets	320,348	304,476
PROPERTY, PLANT AND EQUIPMENT	3,657,039	3,653,792
Less-Accumulated depreciation and amortization	1,785,462	1,761,229
Total property, plant and equipment, net	1,871,577	1,892,563
OTHER ASSETS:
Deferred charges	4,808	3,775
Regulatory assets	10,452	10,692
Right-of-use assets	19,374	20,022
Total other assets	34,634	34,489
Total assets	2,226,559	2,231,528
Payables:
Trade	5,636	16,157
Affiliated companies	7,977	4,110
Accrued liabilities:
Taxes, other than income taxes	14,613	10,905
Interest	12,019	5,505
Exchange gas due to others	1,830	4,557
Customer advances	1,781	539
Other	6,377	6,786
Total current liabilities	50,233	48,559
LONG-TERM DEBT	578,267	578,018
OTHER NONCURRENT LIABILITIES:
Asset retirement obligations	97,129	95,777
Regulatory liabilities	363,771	355,725
Lease liability	8,158	8,341
Other	4,378	4,713
Total other noncurrent liabilities	473,436	464,556
CONTINGENT LIABILITIES AND COMMITMENTS (Note 3)
MEMBER'S EQUITY:
Member's capital	1,073,892	1,073,892
Retained earnings	50,731	66,503
Total member's equity	1,124,623	1,140,395
Total liabilities and member's equity	$ 2,226,559	$ 2,231,528