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v3.20.1

SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) segment | Mar. 31, 2019 USD ($)
Segment information |  |
Number of reportable segments | segment | 6 |
Operating revenues | $ 2,108.6 | $ 2,377.4
Other operation and maintenance | 455.7 | 550.6
Depreciation and amortization | 239.1 | 226.4
Operating income (loss) | 626.6 | 542.8
Equity in earnings of transmission affiliates | 39.8 | 36.1
Interest expense | 129.4 | 124.4
Wisconsin |  |
Segment information |  |
Operating revenues | 1,498.9 | 1,633.4
Illinois |  |
Segment information |  |
Operating revenues | 447.6 | 536.5
Other States |  |
Segment information |  |
Operating revenues | 146.4 | 185.2
Electric Transmission |  |
Segment information |  |
Other operation and maintenance | 0.0 | 0.0
Depreciation and amortization | 0.0 | 0.0
Operating income (loss) | 0.0 | 0.0
Equity in earnings of transmission affiliates | 39.8 | 36.1
Interest expense | $ 4.8 | 2.6
Non-Utility Energy Infrastructure |  |
Segment information |  |
Natural gas storage needs provided to Wisconsin utilities | 33.00% |
Operating revenues | $ 129.6 | 127.8
Other operation and maintenance | 5.2 | 3.8
Depreciation and amortization | 24.5 | 22.6
Operating income (loss) | 91.5 | 92.7
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 15.3 | 15.7
Corporate and Other |  |
Segment information |  |
Operating revenues | 0.5 | 1.7
Other operation and maintenance | (1.6) | (1.0)
Depreciation and amortization | 6.1 | 6.4
Operating income (loss) | (4.2) | (3.9)
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 35.1 | 35.1
Reconciling Eliminations |  |
Segment information |  |
Other operation and maintenance | (4.5) | (0.7)
Depreciation and amortization | (12.2) | (4.6)
Operating income (loss) | (86.5) | (87.2)
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | $ (87.1) | (89.5)
ATC | Electric Transmission |  |
Segment information |  |
Equity method investment, ownership interest (as a percent) | 60.00% |
ATC Holdco |  |
Segment information |  |
Equity method investment, ownership interest (as a percent) | 75.00% |
Equity in earnings of transmission affiliates | $ 0.2 | (0.4)
ATC Holdco | Electric Transmission |  |
Segment information |  |
Equity method investment, ownership interest (as a percent) | 75.00% |
Bishop Hill III | Non-Utility Energy Infrastructure |  |
Segment information |  |
WEC's ownership interest in Bishop Hill III Wind Energy Center | 90.00% |
Coyote Ridge | Non-Utility Energy Infrastructure |  |
Segment information |  |
WEC's ownership interest in Coyote Ridge Wind, LLC | 80.00% |
Upstream | Non-Utility Energy Infrastructure |  |
Segment information |  |
WEC's ownership interest in Upstream Wind Energy Center | 80.00% |
Total utility revenues |  |
Segment information |  |
Other operation and maintenance | $ 456.6 | 548.5
Depreciation and amortization | 220.7 | 202.0
Operating income (loss) | 625.8 | 541.2
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 161.3 | 160.5
Total utility revenues | Wisconsin |  |
Segment information |  |
Other operation and maintenance | 330.8 | 392.7
Depreciation and amortization | 165.4 | 151.0
Operating income (loss) | 426.8 | 361.8
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 143.1 | 143.4
Total utility revenues | Illinois |  |
Segment information |  |
Other operation and maintenance | 104.1 | 128.2
Depreciation and amortization | 47.5 | 44.5
Operating income (loss) | 161.6 | 137.9
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 16.0 | 14.8
Total utility revenues | Other States |  |
Segment information |  |
Other operation and maintenance | 21.7 | 27.6
Depreciation and amortization | 7.8 | 6.5
Operating income (loss) | 37.4 | 41.5
Equity in earnings of transmission affiliates | 0.0 | 0.0
Interest expense | 2.2 | 2.3
External Revenues |  |
Segment information |  |
Operating revenues | 2,108.6 | 2,377.4
External Revenues | Electric Transmission |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
External Revenues | Non-Utility Energy Infrastructure |  |
Segment information |  |
Operating revenues | 15.2 | 20.6
External Revenues | Corporate and Other |  |
Segment information |  |
Operating revenues | 0.5 | 1.7
External Revenues | Reconciling Eliminations |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
External Revenues | Total utility revenues |  |
Segment information |  |
Operating revenues | 2,092.9 | 2,355.1
External Revenues | Total utility revenues | Wisconsin |  |
Segment information |  |
Operating revenues | 1,498.9 | 1,633.4
External Revenues | Total utility revenues | Illinois |  |
Segment information |  |
Operating revenues | 447.6 | 536.5
External Revenues | Total utility revenues | Other States |  |
Segment information |  |
Operating revenues | 146.4 | 185.2
Intersegment Transactions [Member] |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Intersegment Transactions [Member] | Electric Transmission |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Intersegment Transactions [Member] | Non-Utility Energy Infrastructure |  |
Segment information |  |
Operating revenues | 114.4 | 107.2
Intersegment Transactions [Member] | Corporate and Other |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Intersegment Transactions [Member] | Reconciling Eliminations |  |
Segment information |  |
Operating revenues | (114.4) | (107.2)
Intersegment Transactions [Member] | Total utility revenues |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Intersegment Transactions [Member] | Total utility revenues | Wisconsin |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Intersegment Transactions [Member] | Total utility revenues | Illinois |  |
Segment information |  |
Operating revenues | 0.0 | 0.0
Intersegment Transactions [Member] | Total utility revenues | Other States |  |
Segment information |  |
Operating revenues | $ 0.0 | $ 0.0

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