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VARIABLE INTEREST ENTITIES - POWER PURCHASE COMMITMENT (Details) - Power purchase commitment $ in Millions | Jan. 01, 2023 USD ($) | May 31, 2022 MW
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Variable interest entities |  |
Firm capacity from power purchase commitment (in megawatts) | MW |  | 236.5
Residual guarantee associated with power purchase commitment | $ | $ 0.0 |

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- Definition Amount of residual asset covered by residual value guarantee. Excludes guarantee considered to be lease payments for lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919381-209981 + Details
Name: | us-gaap_ResidualValueOfLeasedAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Firm capacity, in megawatts, from a power purchase commitment accounted for as a finance lease. + References No definition available. + Details
Name: | wec_FirmCapacityFromFinanceLeasePowerPurchaseCommitment
Namespace Prefix: | wec_
Data Type: | dtr-types:powerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=wec_PowerPurchaseCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |