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Business Segments | 6 Months Ended
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Jun. 30, 2022
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 BNI Energy, our coal mining operations in North Dakota, New Energy, a renewable energy development company, 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 11. BUSINESS SEGMENTS (Continued)
| Quarter Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2022 | 2021 |  | 2022 | 2021
Millions |  |  |  |  |
Operating Revenue |  |  |  |  |
Regulated Operations |  |  |  |  |
Residential | $40.6 |  | $35.4 |  |  | $96.6 |  | $81.0 |
Commercial | 44.4 |  | 40.7 |  |  | 92.7 |  | 80.4 |
Municipal | 10.0 |  | 11.5 |  |  | 22.1 |  | 24.1 |
Industrial | 150.6 |  | 139.1 |  |  | 298.4 |  | 268.1 |
Other Power Suppliers | 36.9 |  | 37.3 |  |  | 77.9 |  | 75.7 |
Other | 26.2 |  | 26.4 |  |  | 50.0 |  | 54.1 |
Total Regulated Operations | 308.7 |  | 290.4 |  |  | 637.7 |  | 583.4 |
ALLETE Clean Energy |  |  |  |  |
Long-term PSA | 18.9 |  | 18.7 |  |  | 44.3 |  | 36.8 |
Other | 2.3 |  | 2.9 |  |  | 5.1 |  | 5.7 |
Total ALLETE Clean Energy | 21.2 |  | 21.6 |  |  | 49.4 |  | 42.5 |
Corporate and Other |  |  |  |  |
Long-term Contract | 21.4 |  | 21.4 |  |  | 44.0 |  | 43.1 |
Sale of Renewable Development Projects | 14.5 |  | — |  |  | 14.5 |  | — |
Other | 7.3 |  | 2.2 |  |  | 11.0 |  | 5.8 |
Total Corporate and Other | 43.2 |  | 23.6 |  |  | 69.5 |  | 48.9 |
Total Operating Revenue | $373.1 |  | $335.6 |  |  | $756.6 |  | $674.8 |
Net Income Attributable to ALLETE |  |  |  |  |
Regulated Operations | $29.6 |  | $21.5 |  |  | $81.1 |  | $66.5 |
ALLETE Clean Energy | 5.8 |  | 5.1 |  |  | 22.3 |  | 12.5 |
Corporate and Other (a) | 2.2 |  | 1.3 |  |  | 0.5 |  | 0.7 |
Total Net Income Attributable to ALLETE | $37.6 |  | $27.9 |  |  | $103.9 |  | $79.7 |
(a)Net Income in 2022 includes $4.0 million after-tax of purchase price accounting adjustments and $3.0 million after-tax of transaction costs related to the acquisition of New Energy.
| June 30, 2022 | December 31, 2021
Millions |  |
Assets |  |
Regulated Operations | $4,370.9 |  | $4,289.4 |
ALLETE Clean Energy | 1,834.9 |  | 1,719.4 |
Corporate and Other | 633.2 |  | 426.2 |
Total Assets | $6,839.0 |  | $6,435.0 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI https://asc.fasb.org/topic&trid=2134510 + Details
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