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Jointly Owned Utility Facilities (Tables)
 12 Months Ended
Dec. 31, 2019
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]  
Schedule of Jointly Owned Utility Plants
Information related to jointly owned utility facilities at December 31, 2019 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
%
 
27.6
%
 
44.6
%
Share of rated capacity (MW) (1)
 
1,054.3

 
386.0

 
313.9

 
8.4

In-service date
 
2010 and 2011

 
2008

 
1975 and 1978

 
2008

Property, plant, and equipment
 
$
2,447.9

 
$
663.2

 
$
422.3

 
$
118.7

Accumulated depreciation
 
$
(416.1
)
 
$
(232.4
)
 
$
(129.5
)
 
$
(46.4
)
CWIP
 
$
0.8

 
$
5.3

 
$
1.8

 
$
0.1


(1) 
Capacity for our electric generation facilities is based on rated capacity, which is the net power output under average operating conditions with equipment in an average state of repair as of a given month in a given year. Values are primarily based on the net dependable expected capacity ratings for summer 2020 established by tests and may change slightly from year to year. 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 is jointly owned by Wisconsin Power and Light, Madison Gas and Electric, and WPS. In October 2016, Wisconsin Power and Light received an order from the PSCW approving amendments to the Columbia Energy Center joint operating agreement between the parties allowing WPS and Madison Gas and Electric to forgo certain capital expenditures at the Columbia Energy Center. As a result, Wisconsin Power and Light will incur these capital expenditures in exchange for a proportional increase in its ownership share of the Columbia Energy Center. Based upon the additional capital expenditures Wisconsin Power and Light expects to incur through June 1, 2020, WPS's ownership interest would decrease to 27.5%