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Business Segments | 9 Months Ended
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Sep. 30, 2018
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 is our integrated water management company. 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 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. NOTE 14. BUSINESS SEGMENTS (Continued)
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 | 2017 |  | 2018 | 2017
Millions |  |  |  |  |
Operating Revenue (a) |  |  |  |  |
Regulated Operations |  |  |  |  |
Residential |  | $30.8 |  |  | $28.3 |  |  |  | $102.2 |  |  | $95.4 |
Commercial | 38.1 |  | 36.2 |  |  | 110.9 |  | 108.1 |
Municipal | 14.2 |  | 14.6 |  |  | 41.9 |  | 45.1 |
Industrial | 117.3 |  | 122.3 |  |  | 347.5 |  | 365.6 |
Other Power Suppliers | 40.9 |  | 41.2 |  |  | 127.3 |  | 124.1 |
CIP Financial Incentive (b) | 3.0 |  | — |  |  | 3.0 |  | 5.5 |
Other (c) | 17.0 |  | 35.0 |  |  | 56.5 |  | 80.3 |
Total Regulated Operations | 261.3 |  | 277.6 |  |  | 789.3 |  | 824.1 |
Energy Infrastructure and Related Services |  |  |  |  |
ALLETE Clean Energy |  |  |  |  |
Long-term PSA | 9.0 |  | 7.6 |  |  | 40.0 |  | 39.1 |
Other | 6.0 |  | 5.9 |  |  | 17.9 |  | 17.7 |
Total ALLETE Clean Energy | 15.0 |  | 13.5 |  |  | 57.9 |  | 56.8 |
U.S. Water Services |  |  |  |  |
Point-in-Time | 29.0 |  | 26.2 |  |  | 77.0 |  | 71.9 |
Contract | 9.7 |  | 9.1 |  |  | 28.7 |  | 26.8 |
Capital Project | 6.3 |  | 4.9 |  |  | 19.0 |  | 12.0 |
Total U.S. Water Services | 45.0 |  | 40.2 |  |  | 124.7 |  | 110.7 |
Corporate and Other |  |  |  |  |  |  |
Long-term Contract | 21.2 |  | 21.1 |  |  | 63.9 |  | 66.4 |
Other | 5.5 |  | 10.1 |  |  | 14.5 |  | 23.4 |
Total Corporate and Other | 26.7 |  | 31.2 |  |  | 78.4 |  | 89.8 |
Total Operating Revenue |  | $348.0 |  |  | $362.5 |  |  |  | $1,050.3 |  |  | $1,081.4 |
Net Income (Loss) |  |  |  |  |
Regulated Operations |  | $29.8 |  |  | $34.2 |  |  |  | $99.7 |  |  | $110.1 |
Energy Infrastructure and Related Services |  |  |  |  |
ALLETE Clean Energy | 1.0 |  | 0.6 |  |  | 15.9 |  | 11.1 |
U.S. Water Services | 1.7 |  | 1.3 |  |  | 0.5 |  | 1.6 |
Corporate and Other (d) | (1.8 | ) | 8.8 |  |  | (3.1 | ) | 8.0 |
Total Net Income |  | $30.7 |  |  | $44.9 |  |  |  | $113.0 |  |  | $130.8 |
(a) | With the adoption of new revenue recognition guidance, the Company has enhanced the presentation of business segment Operating Revenue. (See Note 1. Operations and Significant Accounting Policies.)
(b) | See Note 6. Regulatory Matters.
(c) | Operating revenue in 2017 included $14.3 million of additional revenue as a result of the favorable impact for the regulatory outcome of the MPUC’s modification of its November 2016 order on the allocation of North Dakota investment tax credits. (See Note 6. Regulatory Matters.)
(d) | Net income in 2017 included a $7.9 million after-tax favorable impact for the regulatory outcome of the MPUC’s modification of its November 2016 order on the allocation of North Dakota investment tax credits. (See Note 6. Regulatory Matters.)
NOTE 14. BUSINESS SEGMENTS (Continued)
| September 30, 2018 |  | December 31, 2017 |
Millions |  |
Assets |  |
Regulated Operations |  | $3,904.3 |  |  | $3,886.6 |
Energy Infrastructure and Related Services |  |
ALLETE Clean Energy | 639.0 |  | 600.5 |
U.S. Water Services | 293.7 |  | 292.4 |
Corporate and Other | 326.3 |  | 300.5 |
Total Assets |  | $5,163.3 |  |  | $5,080.0 |

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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://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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