Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

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)		2018		2017
Regulatory Assets
Asset retirement obligation	$	9,199	$	8,328
Conservation costs		81		222
Debt related costs		9,288		9,749
Derivatives		31,830		41,958
Tax recovery related to AFUDC equity		6,482		5,497
Unfunded pension and other postretirement liability		96,030		84,342
Other		1,991		359
Total Regulatory Assets	$	154,901	$	150,455
Regulatory Liabilities
Deferred fuel savings	$	9,504	$	4,229
Elm Road		2,515		931
Income taxes		135,449		131,689
Non-ARO removal costs		19,891		18,536
Pension and other postretirement service costs		3,669		-
Purchased gas adjustment		1,186		1,404
Renewable energy credits		700		454
Transmission		5,476		1,967
Other		1,074		576
Total Regulatory Liabilities	$	179,464	$	159,786