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SEGMENT INFORMATION
 9 Months Ended
Sep. 30, 2024
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, 2024, 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 operations of MERC and MGU and the non-utility operations of MERC.

•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 and anticipated future 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 WBS.

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, 2024 and 2023:
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended September 30, 2024
External revenues$1,590.0 $173.6 $53.0 $1,816.6 $— $46.9 $— $— $1,863.5 
Intersegment revenues— — — — — 116.2 — (116.2)— 
Other operation and maintenance403.5 126.5 22.6 552.6 — 19.1 (3.3)(1.6)566.8 
Depreciation and amortization232.4 63.9 12.0 308.3 — 49.2 5.6 (22.6)340.5 
Equity in earnings of transmission affiliates— — — — 46.7 — — — 46.7 
Interest expense160.3 22.3 4.1 186.7 4.8 23.4 79.0 (89.7)204.2 
Income tax expense (benefit)63.3 (19.0)(1.3)43.0 10.2 (16.0)(5.6)— 31.6 
Net income (loss)238.1 (48.6)(3.7)185.8 31.7 83.2 (62.1)— 238.6 
Net income (loss) attributed to common shareholders237.8 (48.6)(3.7)185.5 31.7 85.0 (62.1)— 240.1 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended September 30, 2023
External revenues$1,622.0 $243.3 $47.6 $1,912.9 $— $44.5 $— $— $1,957.4 
Intersegment revenues— — — — — 115.3 — (115.3)— 
Other operation and maintenance387.1 86.5 21.7 495.3 — 21.5 1.3 (1.5)516.6 
Depreciation and amortization215.3 59.3 11.2 285.8 — 48.8 5.3 (19.6)320.3 
Equity in earnings of transmission affiliates— — — — 44.7 — — — 44.7 
Interest expense148.7 22.0 3.7 174.4 5.0 24.8 66.3 (88.0)182.5 
Income tax expense (benefit)69.3 8.9 (2.0)76.2 10.0 (6.7)(19.1)— 60.4 
Net income (loss)243.4 24.7 (6.0)262.1 29.7 66.7 (42.9)— 315.6 
Net income (loss) attributed to common shareholders243.1 24.7 (6.0)261.8 29.7 67.4 (42.9)— 316.0 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Nine Months Ended September 30, 2024
External revenues$4,737.0 $1,116.4 $308.6 $6,162.0 $— $153.7 $— $— $6,315.7 
Intersegment revenues— — — — — 355.9 — (355.9)— 
Other operation and maintenance1,182.6 336.1 67.8 1,586.5 — 62.3 (10.7)(7.1)1,631.0 
Depreciation and amortization685.3 191.1 34.9 911.3 — 147.9 16.6 (65.3)1,010.5 
Equity in earnings of transmission affiliates— — — — 138.3 — — — 138.3 
Interest expense475.4 70.8 12.1 558.3 14.5 71.6 222.1 (269.7)596.8 
Income tax expense (benefit)172.6 63.3 12.0 247.9 30.6 (59.6)(58.0)— 160.9 
Net income (loss)637.2 164.6 35.5 837.3 93.2 269.2 (128.5)— 1,071.2 
Net income (loss) attributed to common shareholders636.3 164.6 35.5 836.4 93.2 272.6 (128.5)— 1,073.7 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Nine Months Ended September 30, 2023
External revenues$5,042.8 $1,116.5 $379.5 $6,538.8 $— $136.6 $0.1 $— $6,675.5 
Intersegment revenues— — — — — 358.4 — (358.4)— 
Other operation and maintenance1,119.7 305.5 68.2 1,493.4 — 59.6 0.6 (7.0)1,546.6 
Depreciation and amortization632.9 176.3 32.2 841.4 — 139.9 15.6 (57.2)939.7 
Equity in earnings of transmission affiliates— — — — 132.1 — — — 132.1 
Interest expense449.4 65.0 12.0 526.4 14.6 69.8 183.9 (261.3)533.4 
Income tax expense (benefit)188.8 61.8 10.5 261.1 29.4 (44.2)(63.3)— 183.0 
Net income (loss)686.8 167.9 30.9 885.6 88.1 240.9 (101.4)— 1,113.2 
Net income (loss) attributed to common shareholders685.9 167.9 30.9 884.7 88.1 241.8 (101.4)— 1,113.2