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Investment in ATC and ATC Holdco (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity Method Investments and Joint Ventures [Abstract] |
Equity Method Investments Financial Data | MGE Transco and MGEE Transco have accounted for their investments in ATC and ATC Holdco, respectively, under the equity method of accounting. Equity earnings from investments are recorded as "Other income" on the consolidated statements of income of MGE Energy. MGE Transco recorded the following amounts related to its investment in ATC:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(In thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Equity earnings from investment in ATC |  | $ | 2,500 |  |  | $ | 2,319 |  |  | $ | 7,333 |  |  | $ | 7,724 |
Dividends from investments |  |  | 1,942 |  |  |  | 2,349 |  |  |  | 5,842 |  |  |  | 6,620 |
Capital contributions to ATC |  |  | — |  |  |  | 359 |  |  |  | — |  |  |  | 892 |
ATC's summarized financial data is as follows:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(In thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Operating revenues |  | $ | 186,785 |  |  | $ | 187,833 |  |  | $ | 561,379 |  |  | $ | 577,705 |
Operating expenses |  |  | (91,340 | ) |  |  | (92,975 | ) |  |  | (278,828 | ) |  |  | (285,697 | )
Other income, net |  |  | 123 |  |  |  | 643 |  |  |  | 1,164 |  |  |  | 1,924 |
Interest expense, net |  |  | (28,674 | ) |  |  | (28,801 | ) |  |  | (86,337 | ) |  |  | (83,947 | )
Earnings before members' income taxes |  | $ | 66,894 |  |  | $ | 66,700 |  |  | $ | 197,378 |  |  | $ | 209,985 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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