Statement of Net Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Revenues:
Revenues	$ 731,720	$ 705,895
Operating Costs and Expenses:
Cost of natural gas sales	24,347	21,772
Operation and maintenance	120,354	130,199
General and administrative	50,909	54,774
Depreciation and amortization	133,996	125,367
Taxes, other than income taxes	28,125	26,658
Regulatory credit resulting from tax rate changes	(7,688)	(7,688)
Other (income) expense, net	(7,554)	1,075
Total operating costs and expenses	342,489	352,157
Operating Income	389,231	353,738
Other (Income) and Other Expenses:
Interest expense	80,979	81,096
Interest income	(17,553)	(20,536)
Allowance for equity and borrowed funds used during construction (AFUDC)	(23,588)	(15,583)
Miscellaneous other (income) expense, net	1,558	(30)
Total other (income) and other expenses	41,396	44,947
Net Income	347,835	308,791
Natural gas transportation
Operating Revenues:
Revenues	651,612	623,740
Natural gas storage
Operating Revenues:
Revenues	48,079	47,676
Natural gas sales
Operating Revenues:
Revenues	24,347	21,772
Other
Operating Revenues:
Revenues	$ 7,682	$ 12,707