Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

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,		2019		2018		2019		2018
Cash and cash equivalents	$	23,481	$	83,102	$	3,196	$	4,843
Restricted cash		619		634		619		634
Receivable - margin account		1,714		1,193		1,714		1,193
Cash, cash equivalents, and restricted cash	$	25,814	$	84,929	$	5,529	$	6,670

Schedule of Remaining Contractual Maturities for Chattel Paper Agreements

As of December 31, 2019, the remaining contractual maturities of the chattel paper agreements were as follows:

(In thousands)		2020		2021		2022		2023		2024		Thereafter
Repurchase-to-Maturity Transactions:
Loans	$	280	$	267	$	250	$	181	$	70	$	119

Straight-Line Depreciation Rates

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

	2019		2018		2017
Electric(a)	3.6	%	2.9	%	3.0	%
Gas	2.1	%	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.