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SEGMENT INFORMATION
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
We use net income attributed to common shareholders to measure segment profitability and to allocate resources to our businesses. At September 30, 2021, we reported six segments, which are described below.

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

•The Illinois segment includes the natural gas 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, and
◦WECI, which holds our ownership interests in the following wind generating facilities:
▪90% ownership interest in Bishop Hill III, located in Henry County, Illinois,
▪80% ownership interest in Coyote Ridge, located in Brookings County, South Dakota,
▪90% ownership interest in Upstream, located in Antelope County, Nebraska,
▪90% ownership interest in Blooming Grove, located in McLean County, Illinois,
▪85% ownership interest in Tatanka Ridge, located in Deuel County, South Dakota, and
▪90% ownership interest in Jayhawk, under construction in Bourbon and Crawford counties, Kansas.

See Note 2, Acquisitions, for more information on Tatanka Ridge and Jayhawk.

•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, Wisvest LLC, Wisconsin Energy Capital Corporation, WEC Business Services LLC, and also included the operations of WPS Power Development, LLC in 2020 prior to the sale of its remaining solar facilities in the fourth quarter of 2020.

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, 2021 and 2020:
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended September 30, 2021
External revenues$1,458.6 $216.2 $52.8 $1,727.6 $— $18.7 $0.2 $— $1,746.5 
Intersegment revenues— — — — — 110.8 — (110.8)— 
Other operation and maintenance359.1 91.2 19.6 469.9 — 9.9 (4.5)(1.6)473.7 
Depreciation and amortization184.4 55.4 9.6 249.4 — 31.2 6.3 (15.3)271.6 
Equity in earnings of transmission affiliates— — — — 42.3 — — — 42.3 
Interest expense137.9 16.5 1.6 156.0 4.8 17.6 24.7 (85.1)118.0 
Income tax expense (benefit)33.6 7.0 (1.0)39.6 9.7 5.0 (3.5)— 50.8 
Net income (loss)197.8 19.1 (2.7)214.2 27.8 62.8 (16.1)— 288.7 
Net income (loss) attributed to common shareholders197.5 19.1 (2.7)213.9 27.8 64.4 (16.1)— 290.0 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended September 30, 2020
External revenues$1,366.3 $221.9 $48.3 $1,636.5 $— $13.9 $0.6 $— $1,651.0 
Intersegment revenues— — — — — 109.6 — (109.6)— 
Other operation and maintenance363.8 109.2 20.4 493.4 — 5.9 1.0 (1.6)498.7 
Depreciation and amortization169.7 49.9 8.5 228.1 — 24.5 6.5 (14.1)245.0 
Equity in earnings of transmission affiliates— — — — 40.1 — — — 40.1 
Interest expense139.1 15.6 2.7 157.4 4.9 15.0 30.4 (85.7)122.0 
Income tax expense (benefit)37.5 (4.0)(1.2)32.3 9.0 13.4 (7.8)— 46.9 
Net income (loss)187.9 13.0 (3.3)197.6 26.3 62.9 (19.7)— 267.1 
Net income (loss) attributed to common shareholders187.6 13.0 (3.3)197.3 26.3 62.9 (19.7)— 266.8 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Nine Months Ended September 30, 2021
External revenues$4,497.8 $1,195.1 $358.2 $6,051.1 $— $62.6 $0.4 $— $6,114.1 
Intersegment revenues— — — — — 338.0 — (338.0)— 
Other operation and maintenance1,047.1 291.3 64.0 1,402.4 — 31.2 (9.1)(7.1)1,417.4 
Depreciation and amortization540.4 162.1 28.2 730.7 — 93.5 19.3 (44.3)799.2 
Equity in earnings of transmission affiliates— — — — 126.2 — — — 126.2 
Interest expense417.8 49.6 4.6 472.0 14.5 53.5 73.5 (256.0)357.5 
Income tax expense (benefit)104.8 64.4 8.2 177.4 28.9 5.8 (32.3)— 179.8 
Net income (loss)601.2 174.8 24.5 800.5 82.8 202.3 (10.9)— 1,074.7 
Net income (loss) attributed to common shareholders600.3 174.8 24.5 799.6 82.8 204.6 (10.9)— 1,076.1 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Nine Months Ended September 30, 2020
External revenues$4,071.4 $930.7 $261.4 $5,263.5 $— $42.8 $2.0 $— $5,308.3 
Intersegment revenues— — — — — 335.6 — (335.6)— 
Other operation and maintenance1,044.0 306.5 62.5 1,413.0 — 18.7 2.9 (7.1)1,427.5 
Depreciation and amortization502.7 146.0 24.6 673.3 — 73.4 19.0 (39.1)726.6 
Equity in earnings of transmission affiliates— — — — 132.8 — — — 132.8 
Interest expense422.2 47.7 7.4 477.3 14.6 45.4 98.1 (259.6)375.8 
Income tax expense (benefit)110.5 47.7 8.7 166.9 33.4 35.8 (45.4)— 190.7 
Net income (loss)565.0 152.4 25.8 743.2 84.8 193.2 (59.4)— 961.8 
Net income (loss) attributed to common shareholders564.1 152.4 25.8 742.3 84.8 193.2 (59.4)— 960.9