XML 41 R85.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Commitments and Contingencies (Details-2) $ in Thousands | Dec. 31, 2019 USD ($)
--- | ---
Purchase Obligation, Fiscal Year Maturity [Abstract] |  |
Purchase obligation due in next twelve months | $ 83,721 |
Purchase obligation due in second year | 61,651 |
Purchase obligation due in third year | 56,103 |
Purchase obligation due in fourth year | 39,576 |
Purchase obligation due in fifth year | 28,896 |
Purchase obligation due thereafter | 88,625 |
Coal [Member] |  |
Purchase Obligation, Fiscal Year Maturity [Abstract] |  |
Purchase obligation due in next twelve months | 17,549 | [1]
Purchase obligation due in second year | 5,668 | [1]
Purchase obligation due in third year | 2,323 | [1]
Purchase obligation due in fourth year | 0 | [1]
Purchase obligation due in fifth year | 0 | [1]
Purchase obligation due thereafter | 0 | [1]
Natural Gas, Transportation and Storage [Member] |  |
Purchase Obligation, Fiscal Year Maturity [Abstract] |  |
Purchase obligation due in next twelve months | 21,728 | [2]
Purchase obligation due in second year | 21,728 | [2]
Purchase obligation due in third year | 21,728 | [2]
Purchase obligation due in fourth year | 21,728 | [2]
Purchase obligation due in fifth year | 21,728 | [2]
Purchase obligation due thereafter | 34,117 | [2]
Natural Gas, Supply [Member] |  |
Purchase Obligation, Fiscal Year Maturity [Abstract] |  |
Purchase obligation due in next twelve months | 9,912 | [3]
Purchase obligation due in second year | 0 | [3]
Purchase obligation due in third year | 0 | [3]
Purchase obligation due in fourth year | 0 | [3]
Purchase obligation due in fifth year | 0 | [3]
Purchase obligation due thereafter | 0 | [3]
Purchase Power [Member] |  |
Purchase Obligation, Fiscal Year Maturity [Abstract] |  |
Purchase obligation due in next twelve months | 26,576 | [4]
Purchase obligation due in second year | 26,535 | [4]
Purchase obligation due in third year | 27,952 | [4]
Purchase obligation due in fourth year | 15,216 | [4]
Purchase obligation due in fifth year | 5,636 | [4]
Purchase obligation due thereafter | 21,815 | [4]
Other [Member] |  |
Purchase Obligation, Fiscal Year Maturity [Abstract] |  |
Purchase obligation due in next twelve months | 7,646 |
Purchase obligation due in second year | 4,403 |
Purchase obligation due in third year | 3,374 |
Purchase obligation due in fourth year | 1,889 |
Purchase obligation due in fifth year | 773 |
Purchase obligation due thereafter | 978 |
Solar Farms |  |
Purchase Obligation, Fiscal Year Maturity [Abstract] |  |
Purchase obligation due in next twelve months | 310 | [5]
Purchase obligation due in second year | 3,317 | [5]
Purchase obligation due in third year | 726 | [5]
Purchase obligation due in fourth year | 743 | [5]
Purchase obligation due in fifth year | 759 | [5]
Purchase obligation due thereafter | $ 31,715 | [5]
[1] | Total coal commitments for the Columbia and Elm Road Units, including transportation. Fuel procurement for MGE's jointly owned Columbia and Elm Road Units is handled by WPL and WEPCO, respectively, who are the operators of those facilities.
[2] | MGE's natural gas transportation and storage contracts require fixed monthly payments for firm supply pipeline transportation and storage capacity. The pricing components of the fixed monthly payments for the transportation and storage contracts are approved by FERC but may be subject to change.
[3] | These commitments include market-based pricing.
[4] | MGE has several purchase power agreements to help meet future electric supply requirements.
[5] | In 2019, MGE entered into commitments related to the operations of Two Creeks and Badger Hollow I.

X
- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_PurchaseObligationFiscalYearMaturityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=mgee_CoalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=mgee_NaturalGasTransportationAndStorageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=mgee_NaturalGasSupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=mgee_PurchasePowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=mgee_OtherLongTermPurchaseCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |