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Jointly-Owned Facilities and Projects | 12 Months Ended
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Dec. 31, 2015
Jointly-Owned Facilities and Projects [Abstract] |
Jointly-Owned Facilities and Projects [Text Block] | JOINTLY-OWNED FACILITIES AND PROJECTS Boswell Unit 4. Minnesota Power owns 80 percent of the 585 MW Boswell Unit 4. While Minnesota Power operates the plant, certain decisions about the operations of Boswell Unit 4 are subject to the oversight of a committee on which it and WPPI Energy, the owner of the remaining 20 percent, have equal representation and voting rights. Each owner must provide its own financing and is obligated to its ownership share of operating costs. Minnesota Power’s share of direct operating expenses of Boswell Unit 4 is included in operating expense on our Consolidated Statement of Income. CapX2020. Minnesota Power is a participant in the CapX2020 initiative which represents an effort to ensure electric transmission and distribution reliability in Minnesota and the surrounding region for the future. CapX2020, which consists of electric cooperatives and municipal and investor-owned utilities, including Minnesota’s largest transmission owners, has assessed the transmission system and projected growth in customer demand for electricity through 2020. On April 2, 2015, the CapX2020 transmission line project from Fargo, North Dakota, to St. Cloud, Minnesota, was completed and placed in service. Minnesota Power previously participated in two additional CapX2020 projects which were completed and placed in service in 2011 and 2012. NOTE 4. JOINTLY-OWNED FACILITIES AND PROJECTS (Continued) Minnesota Power’s investments in jointly-owned facilities and projects and the related ownership percentages are as follows:
| Regulated Utility Plant As of December 31 | Plant in Service | Accumulated Depreciation | Construction Work in Progress | % Ownership
| Millions |  |  |  |
| 2015 |  |  |  |
| Boswell Unit 4 |  | $668.2 |  |  | $195.0 |  |  | $6.9 |  | 80
| CapX2020 Projects | 101.1 |  | 3.4 |  | — |  | 9.3 - 14.7
| Total |  | $769.3 |  |  | $198.4 |  |  | $6.9 |  |
| 2014 |  |  |  |
| Boswell Unit 4 |  | $419.1 |  |  | $209.1 |  |  | $168.1 |  | 80
| CapX2020 Projects | 55.5 |  | 1.7 |  | 44.0 |  | 9.3 - 14.7
| Total |  | $474.6 |  |  | $210.8 |  |  | $212.1 |  |

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- Definition Jointly-Owned Electric Facility [Text Block] + References No definition available. + Details
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- Definition Jointly-Owned Facilities and Projects [Abstract] + References No definition available. + Details
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