Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
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Data Type:	xbrli:stringItemType
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Percentage of public utility's requested equity to capital, including debt and equity.

No definition available.

Name:	us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of public utility's requested rate increase (decrease) with regulatory agency.

No definition available.

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Percentage of public utility's requested rate increase (decrease) with regulatory agency.

No definition available.

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreasePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of public utility's requested return on equity.

No definition available.

Name:	us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	wep_PercentageOfAdditionalEarningsBetween15And40BasisPointsRefundedToCustomers
Namespace Prefix:	wep_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	wep_PercentageOfEarningsInExcessOf40BasisPointsRefundedToCustomers
Namespace Prefix:	wep_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of first 15 basis points of additional earnings retained by the utility

No definition available.

Name:	wep_PercentageOfFirst15BasisPointsOfAdditionalEarningsRetainedByTheUtility
Namespace Prefix:	wep_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	wep_ReturnOnEquityInExcessOfFirst15BasisPointsAboveAuthorizedAmountAsAPercent
Namespace Prefix:	wep_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Return on equity (ROE) in excess of authorized amount, for which the additional earnings will be retained by the utility.

No definition available.

Name:	wep_Returnonequityinexcessofauthorizedamountasapercent
Namespace Prefix:	wep_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_RegulatoryAgencyAxis=wep_PublicServiceCommissionOfWisconsinPSCWMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=wep_A2027RatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

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

Name:	srt_ProductOrServiceAxis=wep_SteamRateRequestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=wep_A2028RatesMember
Namespace Prefix:
Data Type:	na
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