Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Cash, Cash Equivalents, and Restricted Cash

The following table presents the components of total cash, cash equivalents, and restricted cash on the consolidated balance sheets.

(In thousands)		MGE Energy				MGE
As of December 31,		2020		2019		2020		2019
Cash and cash equivalents	$	44,738	$	23,481	$	4,103	$	3,196
Restricted cash		644		619		644		619
Receivable - margin account		1,657		1,714		1,657		1,714
Cash, cash equivalents, and restricted cash	$	47,039	$	25,814	$	6,404	$	5,529

Straight-Line Depreciation Rates

Provisions at composite straight-line depreciation rates approximate the following percentages for the cost of depreciable property:

	2020		2019		2018
Electric(a)	3.5	%	3.6	%	2.9	%
Gas	2.2	%	2.1	%	2.1	%
Nonregulated	2.3	%	2.3	%	2.3	%

(a) In the December 2018 rate settlement, the PSCW approved new depreciation rates for Columbia effective January 1, 2019.