Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets and Liabilities

The following regulatory assets and liabilities are reflected in MGE's consolidated balance sheets as of December 31:

(In thousands)	2021		2020
Regulatory Assets
Asset retirement obligation	$	13,081	$	11,935
Deferred fuel costs		3,292		—
Deferred bad debt expense		5,600		3,750
Debt related costs		8,173		8,586
Deferred pension and other postretirement costs		1,017		5,280
Derivatives		—		13,989
Leases		2,992		2,748
Tax recovery related to AFUDC equity		10,347		8,952
Unfunded pension and other postretirement liability		63,728		101,594
Other		782		418
Total Regulatory Assets	$	109,012	$	157,252
Regulatory Liabilities
Deferred fuel savings	$	—	$	5,047
Derivatives		617		—
Elm Road		—		1,957
Income taxes		110,817		129,856
Non-ARO removal costs		29,694		28,197
Pension and other postretirement service costs		11,451		7,524
Deferred pension and other postretirement costs		8,112		—
Purchased gas adjustment		1,448		1,832
Renewable energy credits		1,001		802
Transmission		223		7,669
Other		300		1,019
Total Regulatory Liabilities	$	163,663	$	183,903