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SEGMENT INFORMATION
 3 Months Ended
Mar. 31, 2023
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 March 31, 2023, 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 majority interests in multiple renewable generating facilities.

See Note 2, Acquisitions, for more information on recent WECI acquisitions.
•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, and WEC Business Services LLC.

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 months ended March 31, 2023 and 2022:
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended March 31, 2023
External revenues$1,996.3 $599.7 $250.0 $2,846.0 $— $42.1 $— $— $2,888.1 
Intersegment revenues— — — — — 124.1 — (124.1)— 
Other operation and maintenance380.8 113.7 24.7 519.2 — 17.8 (1.4)(1.6)534.0 
Depreciation and amortization207.3 58.5 10.4 276.2 — 42.7 5.1 (18.5)305.5 
Equity in earnings of transmission affiliates— — — — 43.8 — — — 43.8 
Interest expense150.6 21.6 4.2 176.4 4.8 19.9 55.6 (84.5)172.2 
Income tax expense (benefit)65.9 42.0 11.2 119.1 9.7 (17.8)(36.9)— 74.1 
Net income (loss)257.5 113.1 33.2 403.8 29.3 88.3 (13.8)— 507.6 
Net income (loss) attributed to common shareholders257.2 113.1 33.2 403.5 29.3 88.5 (13.8)— 507.5 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended March 31, 2022
External revenues$1,942.3 $682.1 $240.9 $2,865.3 $— $42.6 $0.2 $— $2,908.1 
Intersegment revenues— — — — — 116.9 — (116.9)— 
Other operation and maintenance312.6 113.6 24.6 450.8 — 10.9 (5.7)(1.6)454.4 
Depreciation and amortization187.1 56.8 10.0 253.9 — 34.0 6.5 (16.3)278.1 
Equity in earnings of transmission affiliates— — — — 41.7 — — — 41.7 
Interest expense136.3 17.7 3.3 157.3 4.9 17.2 22.6 (84.4)117.6 
Income tax expense (benefit)95.4 42.1 10.4 147.9 8.9 (4.9)(24.8)— 127.1 
Net income288.4 113.4 31.5 433.3 27.8 93.3 13.6 — 568.0 
Net income attributed to common shareholders288.1 113.4 31.5 433.0 27.8 91.5 13.6 — 565.9