Asset Retirement Obligations (Notes)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

Asset Retirement Obligations

Our accrued asset retirement obligations relate to our gas storage and transmission facilities. At the end of the useful life of our facilities, we are legally obligated to remove or plug and abandon certain transmission facilities including underground pipelines, major river spans, compressor stations and meter station facilities. These obligations also include restoration of the property sites after removal of the facilities from above and below the ground. Our overall asset retirement obligation changed as follows:

	Year Ended December 31,
	2023		2022
	(Thousands)
Beginning balance	$	129,306	$	122,650
Accretion	7,017		6,656
Changes in estimates of existing obligations (1)	(60)		—
Ending balance	$	136,263	$	129,306

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