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Business Segments
 12 Months Ended
Dec. 31, 2022
Segment Reporting [Abstract]  
Segment Reporting Disclosure [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 three operating segments, New Energy, a renewable energy development company, 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, 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 14. BUSINESS SEGMENTS (Continued)

Year Ended December 31202220212020
Millions   
Operating Revenue
Residential $175.9 $160.8 $140.7 
Commercial187.2 168.6 139.5 
Municipal40.2 52.0 41.2 
Industrial589.0 565.5 432.8 
Other Power Suppliers165.8 168.7 138.8 
Other101.2 112.3 94.3 
Total Regulated Operations 1,259.3 1,227.9 987.3 
ALLETE Clean Energy
Long-term PSA77.2 75.5 68.3 
Sale of Wind Energy Facility33.5 — — 
Other7.6 11.4 11.3 
Total ALLETE Clean Energy118.3 86.9 79.6 
Corporate and Other
Long-term Contract89.2 84.4 86.0 
Sale of Renewable Development Projects73.9 — — 
Other30.0 20.0 16.2 
Total Corporate and Other193.1 104.4 102.2 
Total Operating Revenue$1,570.7 $1,419.2 $1,169.1 
Net Income Attributable to ALLETE (a)
Regulated Operations$149.9 $129.1 $136.3 
ALLETE Clean Energy16.3 26.3 21.1 
Corporate and Other (b)(c)
23.1 13.8 8.0 
Total Net Income Attributable to ALLETE$189.3 $169.2 $165.4 
(a)    Includes interest expense resulting from intercompany loan agreements and allocated to certain subsidiaries. The amounts are eliminated in consolidation. 
(b)    Net Income in 2022 includes a $8.3 million after-tax expense as a result of purchase price accounting related to projects under development at the time of acquisition and $2.7 million after-tax of transaction costs related to the acquisition of New Energy.
(c)    In 2021, South Shore Energy sold a portion of its undivided ownership interest in NTEC to Basin. The closing of the transaction resulted in the recognition of an approximately $8.5 million after-tax gain which is reflected in Corporate and Other. (See Note 1. Operations and Significant Accounting Policies.)
NOTE 14. BUSINESS SEGMENTS (Continued)

Year Ended December 31202220212020
Millions   
Depreciation and Amortization
Regulated Operations$171.9 $170.7 $166.9 
ALLETE Clean Energy58.6 49.2 37.9 
Corporate and Other11.7 11.8 13.0 
Total Depreciation and Amortization$242.2 $231.7 $217.8 
Impairment of Property, Plant and Equipment
ALLETE Clean Energy— — $12.7 
Interest Expense (a)
Regulated Operations $58.1 $57.3 $58.5 
ALLETE Clean Energy2.3 1.5 2.2 
Corporate and Other 19.6 13.2 13.2 
Eliminations(4.8)(2.9)(8.3)
Total Interest Expense$75.2 $69.1 $65.6 
Equity Earnings
Regulated Operations$19.3 $21.3 $22.3 
Corporate and Other(0.6)(1.3)(0.2)
Total Equity Earnings$18.7 $20.0 $22.1 
Income Tax Expense (Benefit)
Regulated Operations$(10.4)$(16.6)$(19.4)
ALLETE Clean Energy(15.4)(16.6)(23.0)
Corporate and Other(5.4)6.3 (1.0)
Total Income Tax Benefit$(31.2)$(26.9)$(43.4)
(a)    Includes interest expense resulting from intercompany loan agreements and allocated to certain subsidiaries. The amounts are eliminated in consolidation.    


As of December 3120222021
Millions
Assets
Regulated Operations $4,291.4 $4,289.4 
ALLETE Clean Energy1,873.3 1,706.7 
Corporate and Other680.9 426.2 
Total Assets $6,845.6 $6,422.3 
Capital Expenditures
Regulated Operations$158.3 $166.8 
ALLETE Clean Energy2.2 269.9 
Corporate and Other47.6 39.7 
Total Capital Expenditures$208.1 $476.4