Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2022

Asset Retirement Obligation Disclosure [Abstract]

Change in Asset Retirement Obligations

The following table summarizes the change in AROs. Amounts include conditional AROs.

(In thousands)	2022			2021
Balance as of January 1,	$	46,580		$	31,196
Liabilities incurred(a)		1,947			8,589
Accretion expense		1,909			1,526
Liabilities settled		(317	)		(354	)
Revisions in estimated cash flows(b)		141			5,623
Balance as of December 31,	$	50,260		$	46,580

(a)In 2021, MGE recorded an obligation of $4.9 million and $3.4 million, respectively, for the fair value of its legal liability for AROs associated with Badger Hollow I and other completed renewable projects. See Footnote 6 for additional information on Badger Hollow I.

(b)In 2021, MGE revised the AROs associated with certain Columbia assets.