Cover
Cover | May 11, 2021 | May 12, 2020 |
Cover [Abstract] | ||
Document Type | 8-K | |
Document Period End Date | May 11, 2021 | |
Entity Registrant Name | ALLETE, Inc | |
Entity Incorporation, State or Country Code | MN | |
Entity File Number | 1-3548 | |
Entity Tax Identification Number | 41-0418150 | |
Entity Address, Address Line One | 30 West Superior Street | |
Entity Address, City or Town | Duluth | |
Entity Address, State or Province | MN | |
Entity Address, Postal Zip Code | 55802-2093 | |
City Area Code | 218 | |
Local Phone Number | 279-5000 | |
Written Communications | false | |
Soliciting Material | false | |
Pre-commencement Tender Offer | false | |
Pre-commencement Issuer Tender Offer | false | |
Title of 12(b) Security | Common Stock, without par value | |
Trading Symbol | ALE | |
Security Exchange Name | NYSE | |
Entity Emerging Growth Company | false | |
Entity Central Index Key | 0000066756 | |
Amendment Flag | false |