Condensed Statement of Net Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Revenues:
Natural gas sales	$ 15,645	$ 14,224
Natural gas transportation	621,537	582,557
Natural gas storage	44,158	42,502
Other	5,128	4,494
Total operating revenues	686,468	643,777
Operating Costs and Expenses:
Cost of natural gas sales	15,645	14,224
Operation and maintenance	111,296	96,084
Administrative and general	51,549	50,753
Depreciation and amortization	132,562	117,797
Taxes - other than income taxes	27,114	24,528
Regulatory credit resulting from tax rate changes	(7,688)	(7,688)
Other (income) expense, net	(10,888)	1,423
Total operating costs and expenses	319,590	297,121
Operating Income	366,878	346,656
Other (Income) and Other Expenses:
Interest expense	82,437	80,175
Allowance for equity and borrowed funds used during construction (AFUDC)	(4,857)	(3,997)
Miscellaneous other expense, net	897	52
Total other (income) and other expenses	78,477	76,230
Net Income	$ 288,401	$ 270,426