| Cover | May 04, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 4, 2021 |
| Entity File Number | 001-01245 |
| Entity Registrant Name | WISCONSIN ELECTRIC POWER COMPANY |
| Entity Central Index Key | 0000107815 |
| Entity Tax Identification Number | 39-0476280 |
| Entity Incorporation, State or Country Code | WI |
| Entity Address, Address Line One | 231 West Michigan Street |
| Entity Address, Address Line Two | P.O. Box 1331 |
| Entity Address, City or Town | Milwaukee |
| Entity Address, State or Province | WI |
| Entity Address, Postal Zip Code | 53201 |
| City Area Code | 414 |
| Local Phone Number | 221-2345 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Wepco Environmental Trust Finance I, LLC | |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 4, 2021 |
| Entity File Number | 333-252252-01 |
| Entity Registrant Name | WEPCO ENVIRONMENTAL TRUST FINANCE I, LLC |
| Entity Central Index Key | 0001840327 |
| Entity Tax Identification Number | 86-1294212 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 231 West Michigan Street |
| Entity Address, Address Line Two | P.O. Box 1331 |
| Entity Address, City or Town | Milwaukee |
| Entity Address, State or Province | WI |
| Entity Address, Postal Zip Code | 53201 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
