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Jointly Owned Facilities (Tables)
 12 Months Ended
Dec. 31, 2017
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]  
Schedule of Jointly Owned Plants
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.