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SEGMENT INFORMATION
 9 Months Ended
Sep. 30, 2019
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION

We use operating income to measure segment profitability and to allocate resources to our businesses. At September 30, 2019, we reported six segments, which are described below.

•
The Wisconsin segment includes the electric and natural gas utility operations of WE, WG, WPS, and UMERC.

•
The Illinois segment includes the natural gas utility and non-utility operations of PGL and NSG.

•
The other states segment includes the natural gas utility and non-utility operations of MERC and MGU.

•
The electric transmission segment includes our approximate 60% ownership interest in ATC, a for-profit, transmission-only company regulated by the FERC for cost of service and certain state regulatory commissions for routing and siting of transmission projects, and our approximate 75% ownership interest in ATC Holdco, which was formed to invest in transmission-related projects outside of ATC's traditional footprint.

•
The non-utility energy infrastructure segment includes:

◦
We Power, which owns and leases generating facilities to WE,
◦
Bluewater, which owns underground natural gas storage facilities in Michigan that provide approximately one-third of the current storage needs for our Wisconsin natural gas utilities,
◦
Our 90% ownership interest in Bishop Hill III, a wind generating facility located in Henry County, Illinois,
◦
Our 80% ownership interest in Coyote Ridge, a wind generating facility under construction in Brookings County, South Dakota, and
◦
Our 80% ownership interest in Upstream, a wind generating facility located in Antelope County, Nebraska.

See Note 2, Acquisitions, for more information on Bishop Hill III, Coyote Ridge, and Upstream.

•
The corporate and other segment includes the operations of the WEC Energy Group holding company, the Integrys holding company, the Peoples Energy, LLC holding company, Wispark LLC, Wisvest LLC, Wisconsin Energy Capital Corporation, WEC Business Services LLC, and PDL.

All of our operations are located within the United States. The following tables show summarized financial information related to our reportable segments for the three and nine months ended September 30, 2019 and 2018:
 
 
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
 
 

 
 

 
 
 
 

 
 
 
 
 
 

 
 

 
 

September 30, 2019
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
1,339.3

 
$
198.0

 
$
48.9

 
$
1,586.2

 
$
—

 
$
20.5

 
$
1.3

 
$
—

 
$
1,608.0

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
98.9

 
—

 
(98.9
)
 
—

Other operation and maintenance
 
400.2

 
101.8

 
22.0

 
524.0

 
—

 
3.9

 
1.3

 
—

 
529.2

Depreciation and amortization
 
155.6

 
45.7

 
6.8

 
208.1

 
—

 
23.3

 
6.0

 
(3.6
)
 
233.8

Operating income (loss)
 
290.8

 
24.8

 
(2.2
)
 
313.4

 
—

 
90.3

 
(6.0
)
 
(86.8
)
 
310.9

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
38.7

 
—

 
—

 
—

 
38.7

Interest expense
 
142.9

 
14.7

 
2.3

 
159.9

 
3.0

 
15.5

 
35.9

 
(88.5
)
 
125.8


 
 
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
 
 

 
 

 
 
 
 

 
 
 
 
 
 

 
 

 
 

September 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
1,388.7

 
$
197.9

 
$
50.2

 
$
1,636.8

 
$
—

 
$
4.5

 
$
2.4

 
$
—

 
$
1,643.7

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
110.7

 
—

 
(110.7
)
 
—

Other operation and maintenance
 
525.0

 
104.5

 
23.0

 
652.5

 
—

 
3.0

 
(4.4
)
 
(98.0
)
 
553.1

Depreciation and amortization
 
137.2

 
43.0

 
6.4

 
186.6

 
—

 
19.1

 
7.1

 
—

 
212.8

Operating income (loss)
 
201.4

 
15.5

 
(5.4
)
 
211.5

 
—

 
91.6

 
(0.4
)
 
—

 
302.7

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
33.7

 
—

 
—

 
—

 
33.7

Interest expense
 
49.6

 
12.8

 
2.1

 
64.5

 
—

 
15.9

 
32.9

 
(1.3
)
 
112.0



 
 
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
Nine Months Ended
 
 

 
 

 
 
 
 

 
 
 
 
 
 

 
 

 
 

September 30, 2019
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
4,226.0

 
$
977.4

 
$
302.9

 
$
5,506.3

 
$
—

 
$
65.4

 
$
3.9

 
$
—

 
$
5,575.6

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
305.1

 
—

 
(305.1
)
 
—

Other operation and maintenance
 
1,156.8

 
337.0

 
73.0

 
1,566.8

 
—

 
14.5

 
2.1

 
—

 
1,583.4

Depreciation and amortization
 
459.5

 
135.2

 
20.0

 
614.7

 
—

 
68.8

 
18.4

 
(11.8
)
 
690.1

Operating income (loss)
 
922.8

 
205.3

 
43.9

 
1,172.0

 
—

 
274.3

 
(17.0
)
 
(261.0
)
 
1,168.3

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
111.7

 
—

 
—

 
—

 
111.7

Interest expense
 
429.0

 
43.4

 
6.5

 
478.9

 
8.3

 
46.7

 
107.5

 
(267.1
)
 
374.3


 
 
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
Nine Months Ended
 
 

 
 

 
 
 
 

 
 
 
 
 
 

 
 

 
 

September 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
External revenues
 
$
4,303.3

 
$
973.2

 
$
292.5

 
$
5,569.0

 
$
—

 
$
26.8

 
$
6.9

 
$
—

 
$
5,602.7

Intersegment revenues
 
—

 
—

 
—

 
—

 
—

 
323.5

 
—

 
(323.5
)
 
—

Other operation and maintenance
 
1,495.9

 
320.8

 
74.5

 
1,891.2

 
—

 
9.2

 
(2.5
)
 
(295.2
)
 
1,602.7

Depreciation and amortization
 
406.9

 
125.7

 
17.5

 
550.1

 
—

 
55.7

 
22.3

 
—

 
628.1

Operating income (loss)
 
670.2

 
204.8

 
38.9

 
913.9

 
—

 
277.0

 
(12.3
)
 
—

 
1,178.6

Equity in earnings of transmission affiliates
 
—

 
—

 
—

 
—

 
95.2

 
—

 
—

 
—

 
95.2

Interest expense
 
147.5

 
37.4

 
6.3

 
191.2

 
—

 
48.0

 
91.2

 
(3.2
)
 
327.2