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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Change in Asset Retirement Obligations The following table summarizes the change in AROs. Amounts include conditional AROs

 

(In thousands)

 

2020

 

2019

 

 

Balance as of January 1,

$

28,355

$

29,980

 

 

Liabilities incurred(a)

 

3,503

 

1,586

 

 

Accretion expense

 

1,366

 

1,574

 

 

Liabilities settled

 

(372)

 

(323)

 

 

Revisions in estimated cash flows(b)

 

(1,656)

 

(4,462)

 

 

Balance as of December 31,

$

31,196

$

28,355

 

(a)In 2020, MGE recorded an obligation of $3.2 million for the fair value of its legal liability for AROs associated with Two Creeks. See Footnote 6 for additional information on Two Creeks. In 2019, MGE recorded an obligation of $1.5 million for the fair value of its legal liability for AROs associated with Saratoga. Construction of Saratoga was completed in February 2019.

 

(b)In 2019, MGE revised the AROs associated with certain wind farms based on updated estimated decommissioning costs.