Statement of Net Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Revenue
Operating revenues	$ 447,335	$ 443,558	$ 449,482
Operating Expenses:
General and administrative	51,682	49,204	47,695
Operation and maintenance	84,260	76,016	69,970
Depreciation and amortization	114,384	113,180	112,004
Taxes, other than income taxes	17,039	16,836	16,290
Regulatory charges resulting from tax rate changes	19,621	23,580	23,580
Other (income) expenses, net	1,712	1,449	1,110
Total operating expenses	288,698	280,265	270,649
Operating Income	158,637	163,293	178,833
Other (Income) and Other Expenses:
Interest expense	30,987	29,986	29,712
Allowance for equity and borrowed funds used during construction	(2,950)	(1,606)	(669)
Miscellaneous other (income) loss, net	(6,174)	(595)	(1,296)
Total other (income) and other expenses	21,863	27,785	27,747
Net Income	136,774	135,508	151,086
Natural gas transportation
Operating Revenue
Operating revenues	429,526	428,136	435,238
Natural gas storage
Operating Revenue
Operating revenues	13,104	12,883	12,609
Other
Operating Revenue
Operating revenues	$ 4,705	$ 2,539	$ 1,635