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SEGMENT INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
Schedule of financial information related to our reportable segments 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