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v3.23.1

SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($) segment | Mar. 31, 2022 USD ($)
Segment information |  |
Number of reportable segments | segment | 6 |
Operating revenues | $ 2,888.1 | $ 2,908.1
Other operation and maintenance | 534.0 | 454.4
Depreciation and amortization | 305.5 | 278.1
Equity in earnings of transmission affiliates | 43.8 | 41.7
Interest expense | 172.2 | 117.6
Income tax expense (benefit) | 74.1 | 127.1
Net income (loss) | 507.6 | 568.0
Net income (loss) attributed to common shareholders | 507.5 | 565.9
External revenues |  |
Segment information |  |
Operating revenues | 2,888.1 | 2,908.1
Intersegment revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Utility operations |  |
Segment information |  |
Other operation and maintenance | 519.2 | 450.8
Depreciation and amortization | 276.2 | 253.9
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 176.4 | 157.3
Income tax expense (benefit) | 119.1 | 147.9
Net income (loss) | 403.8 | 433.3
Net income (loss) attributed to common shareholders | 403.5 | 433.0
Utility operations | External revenues |  |
Segment information |  |
Operating revenues | 2,846.0 | 2,865.3
Utility operations | Intersegment revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Reconciling eliminations |  |
Segment information |  |
Other operation and maintenance | (1.6) | (1.6)
Depreciation and amortization | (18.5) | (16.3)
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | (84.5) | (84.4)
Income tax expense (benefit) | 0.0 | 0.0
Net income (loss) | 0.0 | 0.0
Net income (loss) attributed to common shareholders | 0.0 | 0.0
Reconciling eliminations | External revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Reconciling eliminations | Intersegment revenues |  |
Segment information |  |
Operating revenues | $ (124.1) | (116.9)
ATC |  |
Segment information |  |
Ownership interest (as a percent) | 60.00% |
Equity in earnings of transmission affiliates | $ 42.9 | 41.0
ATC Holdco |  |
Segment information |  |
Ownership interest (as a percent) | 75.00% |
Equity in earnings of transmission affiliates | $ 0.9 | 0.7
Wisconsin |  |
Segment information |  |
Operating revenues | 1,996.3 | 1,942.3
Wisconsin | Utility operations |  |
Segment information |  |
Other operation and maintenance | 380.8 | 312.6
Depreciation and amortization | 207.3 | 187.1
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 150.6 | 136.3
Income tax expense (benefit) | 65.9 | 95.4
Net income (loss) | 257.5 | 288.4
Net income (loss) attributed to common shareholders | 257.2 | 288.1
Wisconsin | Utility operations | External revenues |  |
Segment information |  |
Operating revenues | 1,996.3 | 1,942.3
Wisconsin | Utility operations | Intersegment revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Illinois |  |
Segment information |  |
Operating revenues | 599.7 | 682.1
Illinois | Utility operations |  |
Segment information |  |
Other operation and maintenance | 113.7 | 113.6
Depreciation and amortization | 58.5 | 56.8
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 21.6 | 17.7
Income tax expense (benefit) | 42.0 | 42.1
Net income (loss) | 113.1 | 113.4
Net income (loss) attributed to common shareholders | 113.1 | 113.4
Illinois | Utility operations | External revenues |  |
Segment information |  |
Operating revenues | 599.7 | 682.1
Illinois | Utility operations | Intersegment revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Other States |  |
Segment information |  |
Operating revenues | 250.0 | 240.9
Other States | Utility operations |  |
Segment information |  |
Other operation and maintenance | 24.7 | 24.6
Depreciation and amortization | 10.4 | 10.0
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 4.2 | 3.3
Income tax expense (benefit) | 11.2 | 10.4
Net income (loss) | 33.2 | 31.5
Net income (loss) attributed to common shareholders | 33.2 | 31.5
Other States | Utility operations | External revenues |  |
Segment information |  |
Operating revenues | 250.0 | 240.9
Other States | Utility operations | Intersegment revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Electric Transmission |  |
Segment information |  |
Other operation and maintenance | 0.0 | 0.0
Depreciation and amortization | 0.0 | 0.0
Equity in earnings of transmission affiliates | 43.8 | 41.7
Interest expense | 4.8 | 4.9
Income tax expense (benefit) | 9.7 | 8.9
Net income (loss) | 29.3 | 27.8
Net income (loss) attributed to common shareholders | 29.3 | 27.8
Electric Transmission | External revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Electric Transmission | Intersegment revenues |  |
Segment information |  |
Operating revenues | $ 0.0 | 0.0
Electric Transmission | ATC |  |
Segment information |  |
Ownership interest (as a percent) | 60.00% |
Electric Transmission | ATC Holdco |  |
Segment information |  |
Ownership interest (as a percent) | 75.00% |
Non-Utility Energy Infrastructure |  |
Segment information |  |
Natural gas storage needs provided to Wisconsin utilities | 33.00% |
Operating revenues | $ 166.2 | 159.5
Other operation and maintenance | 17.8 | 10.9
Depreciation and amortization | 42.7 | 34.0
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 19.9 | 17.2
Income tax expense (benefit) | (17.8) | (4.9)
Net income (loss) | 88.3 | 93.3
Net income (loss) attributed to common shareholders | 88.5 | 91.5
Non-Utility Energy Infrastructure | External revenues |  |
Segment information |  |
Operating revenues | 42.1 | 42.6
Non-Utility Energy Infrastructure | Intersegment revenues |  |
Segment information |  |
Operating revenues | 124.1 | 116.9
Corporate and Other |  |
Segment information |  |
Operating revenues | 0.0 | 0.2
Other operation and maintenance | (1.4) | (5.7)
Depreciation and amortization | 5.1 | 6.5
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 55.6 | 22.6
Income tax expense (benefit) | (36.9) | (24.8)
Net income (loss) | (13.8) | 13.6
Net income (loss) attributed to common shareholders | (13.8) | 13.6
Corporate and Other | External revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.2
Corporate and Other | Intersegment revenues |  |
Segment information |  |
Operating revenues | $ 0.0 | $ 0.0

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