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Business Segments | 3 Months Ended
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Mar. 31, 2019
Segment Reporting [Abstract] |
Business Segments [Text Block] | BUSINESS SEGMENTS We present three reportable segments: Regulated Operations, ALLETE Clean Energy and U.S. Water Services. 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. U.S. Water Services was our integrated water management company, which reflects operating results until the closing date of its sale on March 26, 2019. The ALLETE Clean Energy and U.S. Water Services reportable segments comprise our Energy Infrastructure and Related Services businesses. 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,
| 2019 | 2018
Millions |  |
Operating Revenue |  |
Regulated Operations |  |
Residential |  | $45.2 |  |  | $40.7 |
Commercial | 38.9 |  | 36.6 |
Municipal | 15.4 |  | 14.0 |
Industrial | 121.6 |  | 114.9 |
Other Power Suppliers | 39.4 |  | 43.7 |
Other | 21.7 |  | 20.3 |
Total Regulated Operations | 282.2 |  | 270.2 |
Energy Infrastructure and Related Services |  |
ALLETE Clean Energy |  |
Long-term PSA | 14.6 |  | 18.6 |
Other | 2.9 |  | 6.0 |
Total ALLETE Clean Energy | 17.5 |  | 24.6 |
U.S. Water Services (a) |  |
Point-in-Time | 19.0 |  | 22.3 |
Contract | 9.2 |  | 9.5 |
Capital Project | 5.2 |  | 6.4 |
Total U.S. Water Services | 33.4 |  | 38.2 |
Corporate and Other |  |
Long-term Contract | 20.2 |  | 20.0 |
Other | 3.9 |  | 5.2 |
Total Corporate and Other | 24.1 |  | 25.2 |
Total Operating Revenue |  | $357.2 |  |  | $358.2 |
Net Income (Loss) |  |
Regulated Operations |  | $51.5 |  |  | $43.9 |
Energy Infrastructure and Related Services |  |
ALLETE Clean Energy | 5.8 |  | 8.1 |
U.S. Water Services (a) | (1.1 | ) | (1.4 | )
Corporate and Other (a) | 14.3 |  | 0.4 |
Total Net Income |  | $70.5 |  |  | $51.0 |
(a) | On March 26, 2019, ALLETE completed the sale of U.S. Water Services. The Company recognized a gain on the sale of approximately $10 million after-tax reflected in Corporate and Other in 2019. (See Note 1. Operations and Significant Accounting Policies.)
NOTE 11. BUSINESS SEGMENTS (Continued)
| March 31, 2019 |  | December 31, 2018 |
Millions |  |
Assets |  |
Regulated Operations |  | $3,962.7 |  |  | $3,952.5 |
Energy Infrastructure and Related Services |  |
ALLETE Clean Energy | 643.8 |  | 606.6 |
U.S. Water Services (a) | — |  | 295.8 |
Corporate and Other | 612.3 |  | 310.1 |
Total Assets |  | $5,218.8 |  |  | $5,165.0 |
(a) On March 26, 2019, ALLETE completed the sale of U.S. Water Services. (See Note 1. Operations and Significant Accounting Policies.)

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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