Equity and Financing Arrangements	9 Months Ended
Sep. 30, 2021
Equity and Financing Arrangements Disclosure [Abstract]
Equity and Financing Arrangements	Equity and Financing Arrangements. a. Common Stock - MGE Energy. MGE Energy sells shares of its common stock through its Direct Stock Purchase and Dividend Reinvestment Plan (the Stock Plan). Those shares may be newly issued shares or shares that are purchased in the open market by an independent agent for participants in the Stock Plan. All sales under the Stock Plan are covered by a shelf registration statement that MGE Energy filed with the SEC. During the three and nine months ended September 30, 2021, MGE Energy issued no new shares of common stock under the Stock Plan. In May 2020, MGE Energy issued 1.5 million shares of its common stock in an underwritten offering. MGE Energy received proceeds, net of underwriter fees and issuance costs, of $79.6 million from the issuance and sale of those shares. The net proceeds are being used for general corporate purposes, including funding capital expenditures being made by MGE. b. Dilutive Shares Calculation - MGE Energy. As of September 30, 2021, 13,021 shares were included in the calculation of diluted earnings per share related to nonvested equity awards. See Footnote 7 for additional information on shared-based compensation awards. c. Long-term Debt - MGE Energy and MGE. In May 2021, MGE entered into a private placement Note Purchase Agreement in which it committed to issue $60 million of new long-term debt (Series A), carrying an interest rate of 2.48% per annum over its 10-year life, and $40 million of new long-term debt (Series B), carrying an interest rate of 2.63% per annum over its 12-year life. Funding occurred on June 15, 2021, for Series B and August 27, 2021, for Series A. The proceeds of the debt financing will be used to assist with capital expenditures and other corporate obligations. The covenants of this debt are substantially consistent with MGE's existing unsecured long-term debt.

Equity and Financing Arrangements

9 Months Ended

Sep. 30, 2021

Equity and Financing Arrangements Disclosure [Abstract]

Equity and Financing Arrangements.

Common Stock - MGE Energy.

MGE Energy sells shares of its common stock through its Direct Stock Purchase and Dividend Reinvestment Plan (the Stock Plan). Those shares may be newly issued shares or shares that are purchased in the open market by an independent agent for participants in the Stock Plan. All sales under the Stock Plan are covered by a shelf registration statement that MGE Energy filed with the SEC. During the three and nine months ended September 30, 2021, MGE Energy issued no new shares of common stock under the Stock Plan.

In May 2020, MGE Energy issued 1.5 million shares of its common stock in an underwritten offering. MGE Energy received proceeds, net of underwriter fees and issuance costs, of $79.6 million from the issuance and sale of those shares. The net proceeds are being used for general corporate purposes, including funding capital expenditures being made by MGE.

Dilutive Shares Calculation - MGE Energy.

As of September 30, 2021, 13,021 shares were included in the calculation of diluted earnings per share related to nonvested equity awards. See Footnote 7 for additional information on shared-based compensation awards.

Long-term Debt - MGE Energy and MGE.

In May 2021, MGE entered into a private placement Note Purchase Agreement in which it committed to issue $60 million of new long-term debt (Series A), carrying an interest rate of 2.48% per annum over its 10-year life, and $40 million of new long-term debt (Series B), carrying an interest rate of 2.63% per annum over its 12-year life. Funding occurred on June 15, 2021, for Series B and August 27, 2021, for Series A. The proceeds of the debt financing will be used to assist with capital expenditures and other corporate obligations. The covenants of this debt are substantially consistent with MGE's existing unsecured long-term debt.