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Jointly Owned Utility Facilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Jointly Owned Utility Plant, Net Ownership Amount [Abstract] |
Schedule of Jointly Owned Utility Plants | Information related to jointly owned utility facilities at December 31, 2018 was as follows:
|  | We Power |  | WPS
(in millions, except for percentages and MW) |  | Elm Road Generating Station Units 1 and 2 |  | Weston Unit 4 |  | Columbia Energy Center Units 1 and 2 (2) |  | Forward Wind Energy Center
Ownership |  | 83.34 | % |  | 70.0 | % |  | 28.1 | % |  | 44.6 | %
Share of rated capacity (MW) (1) |  | 1,056.8 |  |  | 384.9 |  |  | 314.8 |  |  | 8.7 |
In-service date |  | 2010 and 2011 |  |  | 2008 |  |  | 1975 and 1978 |  |  | 2008 |
Property, plant, and equipment |  | $ | 2,450.6 |  |  | $ | 615.4 |  |  | $ | 438.8 |  |  | $ | 123.7 |
Accumulated depreciation |  | $ | (394.1 | ) |  | $ | (205.2 | ) |  | $ | (132.2 | ) |  | $ | (43.7 | )
CWIP |  | $ | 1.8 |  |  | $ | 1.9 |  |  | $ | 0.3 |  |  | $ | 0.1 |
(1) | Values are primarily based on the net dependable capacity ratings for summer 2019 using historical generation. The summer period is the most relevant for capacity planning purposes. This is a result of continually reaching demand peaks in the summer months, primarily due to air conditioning demand.
(2) | Columbia Energy Center (Columbia) is jointly owned by Wisconsin Power and Light (WPL), Madison Gas and Electric (MGE), and WPS. In October 2016, WPL received an order from the PSCW approving amendments to the Columbia joint operating agreement between the parties allowing WPS and MGE to forgo certain capital expenditures at Columbia. As a result, WPL will incur these capital expenditures in exchange for a proportional increase in its ownership share of Columbia. Based upon the additional capital expenditures WPL expects to incur through June 1, 2020, WPS's ownership interest would decrease to 27.5%.

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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
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