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Notes Payable to Banks, Commercial Paper, and Lines of Credit (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Short-Term Borrowings | Information concerning short-term borrowings is shown below:
| (In thousands) |  | MGE Energy(a) |  |  |  | MGE |  |
| As of December 31, |  | 2019 |  |  | 2018 |  |  |  | 2019 |  |  | 2018 |  |
| Available lines of credit | $ | 150,000 |  | $ | 150,000 |  |  | $ | 100,000 |  | $ | 100,000 |  |
| Short-term debt outstanding | $ | - |  | $ | 13,000 |  |  | $ | - |  | $ | 13,000 |  |
| Weighted-average interest rate |  | - | % |  | 2.55 | % |  |  | - | % |  | 2.55 | % |
| Year Ended December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Maximum short-term borrowings | $ | 56,000 |  | $ | 31,500 |  |  | $ | 56,000 |  | $ | 31,500 |  |
| Average short-term borrowings | $ | 18,364 |  | $ | 9,211 |  |  | $ | 18,364 |  | $ | 9,211 |  |
| Weighted-average interest rate |  | 2.16 | % |  | 1.92 | % |  |  | 2.16 | % |  | 1.92 | % |
(a) MGE Energy short-term borrowings include MGE Energy and MGE lines of credit and MGE commercial paper.

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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