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JOINTLY OWNED UTILITY FACILITIES (Tables)
 12 Months Ended
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:
(in millions, except for percentages and MW)
 
Weston Unit 4
 
Columbia Energy Center
Units 1 and 2 (2)
 
Forward Wind Energy Center
Ownership
 
70.0
%
 
28.1
%
 
44.6
%
Our share of rated capacity (MW) (1)
 
384.9

 
314.8

 
8.7

In-service date
 
2008

 
1975 and 1978

 
2008

Property, plant, and equipment
 
$
615.4

 
$
438.8

 
$
123.7

Accumulated depreciation
 
$
(205.2
)
 
$
(132.2
)
 
$
(43.7
)
CWIP
 
$
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 us. In October 2016, WPL received an order from the PSCW approving amendments to the Columbia joint operating agreement between the parties allowing MGE and us 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, our ownership interest would decrease to 27.5%.