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Jointly Owned Facilities | 12 Months Ended
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Dec. 31, 2017
Jointly Owned Utility Plant, Net Ownership Amount [Abstract] |
JOINTLY OWNED FACILITIES | JOINTLY OWNED FACILITIES We Power and WPS hold joint ownership interests in certain electric generating facilities. They are entitled to their share of generating capability and output of each facility equal to their respective ownership interest. They pay their ownership share of additional construction costs and have supplied their own financing for all jointly owned projects. We record We Power's and WPS's proportionate share of significant jointly owned electric generating facilities as property, plant, and equipment on the balance sheets. We Power leases its ownership interest in ER 1 and ER 2 to WE, and WE operates these units. WE and WPS record their respective share of fuel inventory purchases and operating expenses, unless specific agreements have been executed to limit their maximum exposure to additional costs. WE's and WPS's proportionate share of direct expenses for the joint operation of these plants is recorded in operating expenses in the income statements. Information related to jointly owned facilities at December 31, 2017 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) |  | Edgewater Unit 4 (3)
Ownership |  | 83.34 | % |  | 70.0 | % |  | 29.5 | % |  | 31.8 | %
Share of rated capacity (MW) (1) |  | 1,056.8 |  |  | 383.9 |  |  | 319.7 |  |  | 98.0 |
In-service date |  | 2010 and 2011 |  |  | 2008 |  |  | 1975 and 1978 |  |  | 1969 |
Property, plant, and equipment |  | $ | 2,431.0 |  |  | $ | 600.5 |  |  | $ | 412.7 |  |  | $ | 45.9 |
Accumulated depreciation |  | $ | (351.2 | ) |  | $ | (189.2 | ) |  | $ | (127.3 | ) |  | $ | (32.9 | )
CWIP |  | $ | 9.5 |  |  | $ | 5.3 |  |  | $ | 27.6 |  |  | $ | — |
(1) | Based on expected capacity ratings for summer 2018. 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%.
(3) | WPS anticipates that the Edgewater Unit 4 generating unit will be retired by September 30, 2018. See Note 5, Property, Plant, and Equipment, for more information.

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