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Business Segments | 6 Months Ended
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Jun. 30, 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)
| Quarter Ended |  | Six Months Ended
| June 30 |  | June 30
| 2023 | 2022 |  | 2023 | 2022
Millions |  |  |  |  |
Operating Revenue |  |  |  |  |
Regulated Operations |  |  |  |  |
Residential | $36.0 |  | $40.6 |  |  | $85.4 |  | $96.6 |
Commercial | 44.0 |  | 44.4 |  |  | 91.7 |  | 92.7 |
Municipal | 7.6 |  | 10.0 |  |  | 16.5 |  | 22.1 |
Industrial | 140.2 |  | 150.6 |  |  | 285.1 |  | 298.4 |
Other Power Suppliers | 36.3 |  | 36.9 |  |  | 72.2 |  | 77.9 |
Other | 28.1 |  | 26.2 |  |  | 53.9 |  | 50.0 |
Total Regulated Operations | 292.2 |  | 308.7 |  |  | 604.8 |  | 637.7 |
ALLETE Clean Energy |  |  |  |  |
Long-term PSA | 13.2 |  | 18.9 |  |  | 31.6 |  | 44.3 |
Sale of Wind Energy Facilities | 166.6 |  | — |  |  | 348.4 |  | — |
Other | 1.3 |  | 2.3 |  |  | 2.6 |  | 5.1 |
Total ALLETE Clean Energy | 181.1 |  | 21.2 |  |  | 382.6 |  | 49.4 |
Corporate and Other |  |  |  |  |
Long-term Contract | 23.9 |  | 21.4 |  |  | 49.4 |  | 44.0 |
Sale of Renewable Development Projects | 32.6 |  | 14.5 |  |  | 52.4 |  | 14.5 |
Other | 3.6 |  | 7.3 |  |  | 9.1 |  | 11.0 |
Total Corporate and Other | 60.1 |  | 43.2 |  |  | 110.9 |  | 69.5 |
Total Operating Revenue | $533.4 |  | $373.1 |  |  | $1,098.3 |  | $756.6 |
Net Income Attributable to ALLETE |  |  |  |  |
Regulated Operations | $37.8 |  | $29.6 |  |  | $78.4 |  | $81.1 |
ALLETE Clean Energy | 3.1 |  | 5.8 |  |  | 11.6 |  | 22.3 |
Corporate and Other (a) | 10.6 |  | 2.2 |  |  | 19.7 |  | 0.5 |
Total Net Income Attributable to ALLETE | $51.5 |  | $37.6 |  |  | $109.7 |  | $103.9 |
(a)Net Income in 2022 includes a $4.0 million after-tax expense as a result of purchase price accounting related to projects under development at the time of acquisition and $3.0 million after-tax of transaction costs related to the acquisition of New Energy.
| June 30, 2023 | December 31, 2022
Millions |  |
Assets |  |
Regulated Operations | $4,259.8 |  | $4,291.4 |
ALLETE Clean Energy | 1,557.9 |  | 1,873.3 |
Corporate and Other | 750.2 |  | 680.9 |
Total Assets | $6,567.9 |  | $6,845.6 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//280/tableOfContent Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-26 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-34 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 + Details
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