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Equity and Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011
MGE Power Elm Road Issued Debt [Abstract]
Issuance of secured long-term debt	$ 30.0
Maturity date	Feb. 25, 2041
Interest rate on secured long-term debt	4.74%
Debt service coverage ratio range, high	1.25
Debt service coverage ratio range, low	1.00

- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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