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Business Segments
 3 Months Ended
Mar. 31, 2023
Segment Reporting [Abstract]  
Business Segments [Text Block] BUSINESS SEGMENTS
We present two reportable segments: Regulated Operations and ALLETE Clean Energy. We measure performance of our operations through budgeting and monitoring of contributions to consolidated net income by each business segment.

Regulated Operations includes three operating segments which consist of our regulated utilities, Minnesota Power and SWL&P, as well as our investment in ATC. ALLETE Clean Energy is our business focused on developing, acquiring and operating clean and renewable energy projects. We also present Corporate and Other which includes New Energy, a renewable energy development company, BNI Energy, our coal mining operations in North Dakota, ALLETE Properties, our legacy Florida real estate investment, along with our investment in Nobles 2, South Shore Energy, our non-rate regulated, Wisconsin subsidiary developing NTEC, other business development and corporate expenditures, unallocated interest expense, a small amount of non-rate base generation, land holdings in Minnesota, and earnings on cash and investments.
NOTE 10. BUSINESS SEGMENTS (Continued)

Three Months Ended
March 31
 20232022
Millions
Operating Revenue
Regulated Operations
Residential$49.4 $56.0 
Commercial47.7 48.3 
Municipal8.9 12.1 
Industrial144.9 147.8 
Other Power Suppliers35.9 41.0 
Other25.8 23.8 
Total Regulated Operations312.6 329.0 
ALLETE Clean Energy
Long-term PSA18.4 25.4 
Sale of Wind Energy Facility181.8 — 
Other1.3 2.8 
Total ALLETE Clean Energy201.5 28.2 
Corporate and Other
Long-term Contract25.5 22.6 
Sale of Renewable Development Projects19.8 — 
Other5.5 3.7 
Total Corporate and Other50.8 26.3 
Total Operating Revenue$564.9 $383.5 
Net Income (Loss) Attributable to ALLETE
Regulated Operations$40.6 $51.5 
ALLETE Clean Energy8.5 16.5 
Corporate and Other9.1 (1.7)
Total Net Income Attributable to ALLETE$58.2 $66.3 

March 31,
2023		December 31,
2022
Millions
Assets
Regulated Operations $4,268.8 $4,291.4 
ALLETE Clean Energy 1,697.3 1,873.3 
Corporate and Other738.4 680.9 
Total Assets $6,704.5 $6,845.6