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SEGMENT INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2020
Segment Reporting [Abstract]  
Financial information of reportable segments The following tables show summarized financial information related to our reportable segments for the three months ended March 31, 2020 and 2019:
 
 
Utility Operations
 
 
 
 
 
 
 
 
 
 
(in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Total Utility
Operations
 
Electric Transmission
 
Non-Utility Energy Infrastructure
 
Corporate
and Other
 
Reconciling
Eliminations
 
WEC Energy Group Consolidated
Three Months Ended
 
 

 
 

 
 
 
 

 
 
 
 
 
 

 
 

 
 

March 31, 2020
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
1,498.9

 
$
447.6

 
$
146.4

 
$
2,092.9

 
$
—

 
$
15.2

 
$
0.5

 
$
—

 
$
2,108.6

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
114.4

 
—

 
(114.4
)
 
—

Other operation and maintenance
 
330.8

 
104.1

 
21.7

 
456.6

 
—

 
5.2

 
(1.6
)
 
(4.5
)
 
455.7

Depreciation and amortization
 
165.4

 
47.5

 
7.8

 
220.7

 
—

 
24.5

 
6.1

 
(12.2
)
 
239.1

Operating income (loss)
 
426.8

 
161.6

 
37.4

 
625.8

 
—

 
91.5

 
(4.2
)
 
(86.5
)
 
626.6

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
39.8

 
—

 
—

 
—

 
39.8

Interest expense
 
143.1

 
16.0

 
2.2

 
161.3

 
4.8

 
15.3

 
35.1

 
(87.1
)
 
129.4


 
 
Utility Operations
 
 
 
 
 
 
 
 
 
 
(in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Total Utility
Operations
 
Electric Transmission
 
Non-Utility Energy Infrastructure
 
Corporate
and Other
 
Reconciling
Eliminations
 
WEC Energy Group Consolidated
Three Months Ended
 
 

 
 

 
 
 
 

 
 
 
 
 
 

 
 

 
 

March 31, 2019
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
1,633.4

 
$
536.5

 
$
185.2

 
$
2,355.1

 
$
—

 
$
20.6

 
$
1.7

 
$
—

 
$
2,377.4

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
107.2

 
—

 
(107.2
)
 
—

Other operation and maintenance
 
392.7

 
128.2

 
27.6

 
548.5

 
—

 
3.8

 
(1.0
)
 
(0.7
)
 
550.6

Depreciation and amortization
 
151.0

 
44.5

 
6.5

 
202.0

 
—

 
22.6

 
6.4

 
(4.6
)
 
226.4

Operating income (loss)
 
361.8

 
137.9

 
41.5

 
541.2

 
—

 
92.7

 
(3.9
)
 
(87.2
)
 
542.8

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
36.1

 
—

 
—

 
—

 
36.1

Interest expense
 
143.4

 
14.8

 
2.3

 
160.5

 
2.6

 
15.7

 
35.1

 
(89.5
)
 
124.4