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Business Segments
 3 Months Ended
Mar. 31, 2021
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 two operating segments, BNI Energy, our coal mining operations in North Dakota, and ALLETE Properties, our legacy Florida real estate investment, along with our investment in Nobles 2, other business development and corporate expenditures, unallocated interest expense, a small amount of non-rate base generation, approximately 4,000 acres of land in Minnesota, and earnings on cash and investments.
Three Months Ended
March 31,
 20212020
Millions
Operating Revenue
Regulated Operations
Residential$45.6 $40.9 
Commercial39.7 37.3 
Municipal12.6 10.3 
Industrial129.0 118.8 
Other Power Suppliers38.4 38.3 
Other27.7 19.7 
Total Regulated Operations293.0 265.3 
ALLETE Clean Energy
Long-term PSA18.1 17.3 
Other2.8 2.8 
Total ALLETE Clean Energy20.9 20.1 
Corporate and Other
Long-term Contract21.7 22.4 
Other3.6 3.8 
Total Corporate and Other25.3 26.2 
Total Operating Revenue$339.2 $311.6 
Net Income (Loss) Attributable to ALLETE
Regulated Operations$45.0 $57.5 
ALLETE Clean Energy7.4 11.7 
Corporate and Other (0.6)(2.9)
Total Net Income Attributable to ALLETE$51.8 $66.3 
NOTE 10. BUSINESS SEGMENTS (Continued)
March 31,
2021		December 31,
2020
Millions
Assets
Regulated Operations $4,184.1 $4,196.8 
ALLETE Clean Energy 1,596.6 1,483.3 
Corporate and Other493.8 404.5 
Total Assets $6,274.5 $6,084.6