XML 127 R115.htm IDEA: XBRL DOCUMENT
v3.26.1

REGULATORY ENVIRONMENT - WI 2027 AND 2028 RATE CASES (Details) - Public Service Commission of Wisconsin (PSCW) $ in Millions | Apr. 01, 2026 USD ($)
--- | ---
2027 Rates | WE | Electric |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 175.8
Requested Rate Increase (Decrease), Percentage | 4.70%
2027 Rates | WE | Natural gas |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 2.1
Requested Rate Increase (Decrease), Percentage | 0.30%
2027 Rates | WE | Steam |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 0.1
Requested Rate Increase (Decrease), Percentage | 0.20%
2027 Rates | WPS | Electric |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 86.1
Requested Rate Increase (Decrease), Percentage | 6.30%
2027 Rates | WPS | Natural gas |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 21.7
Requested Rate Increase (Decrease), Percentage | 4.90%
2027 Rates | WG | Natural gas |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 59.4
Requested Rate Increase (Decrease), Percentage | 6.80%
2028 Rates | WE | Electric |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 179.5
Requested Rate Increase (Decrease), Percentage | 4.50%
2028 Rates | WE | Natural gas |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 33.3
Requested Rate Increase (Decrease), Percentage | 4.90%
2028 Rates | WE | Steam |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 1.2
Requested Rate Increase (Decrease), Percentage | 3.80%
2028 Rates | WPS | Electric |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 50.8
Requested Rate Increase (Decrease), Percentage | 3.50%
2028 Rates | WPS | Natural gas |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 6.9
Requested Rate Increase (Decrease), Percentage | 1.50%
2028 Rates | WG | Natural gas |
Public Utilities, General Disclosures [Line Items] |
Requested Rate Increase (Decrease), Amount | $ 37.2
Requested Rate Increase (Decrease), Percentage | 4.00%
2027 and 2028 Rates | WE |
Public Utilities, General Disclosures [Line Items] |
Requested return on equity (as a percent) | 9.90%
Requested common equity component average (as a percent) | 53.50%
Percentage of first 15 basis points of additional earnings retained by the utility | 100.00%
Return on equity in excess of authorized amount (as a percent) | 0.15%
Percentage of additional earnings between 15 and 40 basis points refunded to customers | 50.00%
Return on equity in excess of first 15 basis points above authorized amount (as a percent) | 0.25%
Percentage of earnings in excess of 40 basis points refunded to customers | 100.00%
2027 and 2028 Rates | WPS |
Public Utilities, General Disclosures [Line Items] |
Requested return on equity (as a percent) | 9.90%
Requested common equity component average (as a percent) | 55.00%
Percentage of first 15 basis points of additional earnings retained by the utility | 100.00%
Return on equity in excess of authorized amount (as a percent) | 0.15%
Return on equity in excess of first 15 basis points above authorized amount (as a percent) | 0.60%
Percentage of additional earnings between 15 and 75 basis points refunded to customers | 50.00%
Percentage of earnings in excess of 75 basis points refunded to customers | 100.00%
2027 and 2028 Rates | WG |
Public Utilities, General Disclosures [Line Items] |
Requested return on equity (as a percent) | 9.90%
Requested common equity component average (as a percent) | 53.50%
Percentage of first 15 basis points of additional earnings retained by the utility | 100.00%
Return on equity in excess of authorized amount (as a percent) | 0.15%
Return on equity in excess of first 15 basis points above authorized amount (as a percent) | 0.60%
Percentage of additional earnings between 15 and 75 basis points refunded to customers | 50.00%
Percentage of earnings in excess of 75 basis points refunded to customers | 100.00%

X
- 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
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's requested equity to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of utility earnings in excess of 15 basis points above the utility’s authorized return on equity (ROE), but not exceeding 60 basis points above the authorized ROE, that will be refunded to customers. + References No definition available. + Details
Name: | wec_PercentageOfAdditionalEarningsBetween15And40BasisPointsRefundedToCustomers
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of utility earnings in excess of 15 basis points above the utility’s authorized return on equity (ROE), but not exceeding 75 basis points above the authorized ROE, that will be refunded to customers. + References No definition available. + Details
Name: | wec_PercentageOfAdditionalEarningsBetween15And75BasisPointsRefundedToCustomers
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of utility earnings in excess of 40 basis points above the utility’s authorized return on equity (ROE) that will be refunded to customers. + References No definition available. + Details
Name: | wec_PercentageOfEarningsInExcessOf40BasisPointsRefundedToCustomers
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of first 15 basis points of additional earnings retained by the utility + References No definition available. + Details
Name: | wec_PercentageOfFirst15BasisPointsOfAdditionalEarningsRetainedByTheUtility
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of utility earnings in excess of 75 basis points above the utility’s authorized return on equity (ROE) that will be refunded to customers. + References No definition available. + Details
Name: | wec_Percentageofearningsinexcessof75basispointsrefundedtocustomers
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Return on equity (ROE) in excess of the first 15 basis points above the authorized amount, for which a percentage will be returned to customers. + References No definition available. + Details
Name: | wec_ReturnOnEquityInExcessOfFirst15BasisPointsAboveAuthorizedAmountAsAPercent
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Return on equity (ROE) in excess of authorized amount, for which the additional earnings will be retained by the utility. + References No definition available. + Details
Name: | wec_Returnonequityinexcessofauthorizedamountasapercent
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=wec_PublicServiceCommissionOfWisconsinPSCWMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=wec_A2027RatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=wec_WisconsinElectricPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ElectricityUsRegulatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_NaturalGasUsRegulatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=wec_SteamRateRequestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=wec_WisconsinPublicServiceCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=wec_WisconsinGasLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=wec_A2028RatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=wec_A2027And2028RateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |