Summary of Significant Accounting Principles (Tables)

9 Months Ended

Sep. 30, 2018

Cash, Cash Equivalents, And Restricted Cash [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.

		MGE Energy				MGE
		September 30,		December 31,		September 30,		December 31,
(In thousands)		2018		2017		2018		2017
Cash and cash equivalents	$	133,855	$	107,952	$	47,264	$	5,951
Restricted cash		406		1,635		406		1,635
Receivable - margin account		780		2,507		780		2,507
Cash, cash equivalents, and restricted cash	$	135,041	$	112,094	$	48,450	$	10,093

Retrospective Adjustments to Cash Flows

The following table presents the retrospective adjustments to cash flow amounts on MGE Energy's and MGE's consolidated statements of cash flows in accordance with the adoption of ASU 2016-18, Restricted Cash.

		Nine Months Ended
(In thousands)		September 30, 2017
Cash provided by operating activities	$	(2,870)
Cash used for investing activities		525
Change in cash, cash equivalents, and restricted cash		(2,345)
Cash, cash equivalents, and restricted cash at beginning of period		5,674
Cash, cash equivalents, and restricted cash at end of period	$	3,329