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Notes Payable to Banks, Commercial Paper, and Lines of Credit | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Notes Payable to Banks, Commercial Paper, and Lines of Credit | Notes Payable to Banks, Commercial Paper, and Lines of Credit. a. MGE Energy. At December 31, 2015, MGE Energy had an unsecured, committe d revolving line of credit of $50 million expiring June 1, 2020. At December 31, 2015, no borrowings were outstanding under this facility. The agreement require s MGE Energy to maintain a ratio of its consolidated indebtedness to consolidated total capitalizati on not to exceed a maximum of 65%. A chan ge in control constitute s a default under the agreement. Change in control events are defined as (i) a failure by MGE Energy to hold 100% of the outstanding voting equity interest in MGE or (ii) the acquisition of beneficia l ownership of 30% or more of the outstanding voting stock of MGE Energy by one person or two or more persons acting in concert. As of December 31, 2015, MGE Energy was in compliance with the covenant requirements. b. MGE. For short-term borrowings, MGE generally issues commercial paper (issued at the prevailing discount rate at the time of issuance), which is supported by unused committed bank lines of credit. At December 31, 2015, MGE had two unsecured, committed revolvi ng line s of credit for a total of $100 million expiring June 1, 2020. At December 31, 2015, no borrowings were outstanding under these f acilities, and MGE had no commercial paper outstanding. The agreement s require MGE to maintain a ratio of consol idated debt to consolidated total capitalization not to exceed a maximum of 65%. The ratio calculation excludes assets, liabilities, revenues, and expenses included in MGE's financial statements as the result of the consolidation of VIEs, such as MGE Power West Campus and MGE Power Elm Road. A change in control constitute s a default under the agreement. Change in control events are defined as (i) a failure by MGE Energy to hold 100% of the outstanding voting equity interest in MGE or (ii) the acquisition of beneficial ownership of 30% or more of the outstanding voting stock of MGE Energy by one person or two or more persons acting in concert. As of December 31, 2015, MGE was in compliance with the covenant requirements. c. MGE Energy and MGE. Information concerning short-term borrowings for the past three years is shown below:
|  |  | As of December 31, |
| (In thousands) |  | 2015 |  | 2014 |  | 2013 |
| MGE Energy(a) |  |  |  |  |  |  |
| Available lines of credit | $ | 150,000 | $ | 150,000 | $ | 150,000 |
| Short-term debt outstanding | $ | - | $ | 7,000 | $ | - |
| Weighted-average interest rate |  | -% |  | 0.20% |  | -% |
| During the year: |  |  |  |  |  |  |
| Maximum short-term borrowings | $ | 17,500 | $ | 9,000 | $ | 32,000 |
| Average short-term borrowings | $ | 1,511 | $ | 182 | $ | 6,992 |
| Weighted-average interest rate |  | 0.17% |  | 0.24% |  | 0.18% |
| MGE |  |  |  |  |  |  |
| Available lines of credit | $ | 100,000 | $ | 100,000 | $ | 100,000 |
| Commercial paper outstanding | $ | - | $ | 7,000 | $ | - |
| Weighted-average interest rate |  | -% |  | 0.20% |  | -% |
| During the year: |  |  |  |  |  |  |
| Maximum short-term borrowings | $ | 17,500 | $ | 9,000 | $ | 32,000 |
| Average short-term borrowings | $ | 1,511 | $ | 182 | $ | 6,992 |
| Weighted-average interest rate |  | 0.17% |  | 0.24% |  | 0.18% |
(a) MGE Energy short-term borrowings include MGE Energy and MGE lines of credit and MGE commercial paper.

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