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v3.19.3

SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($)
Segment information |  |  |  |
Number of reportable segments | segment |  |  | 6 |
Operating revenues | $ 1,608.0 | $ 1,643.7 | $ 5,575.6 | $ 5,602.7
Other operation and maintenance | 529.2 | 553.1 | 1,583.4 | 1,602.7
Depreciation and amortization | 233.8 | 212.8 | 690.1 | 628.1
Operating income (loss) | 310.9 | 302.7 | 1,168.3 | 1,178.6
Equity in earnings of transmission affiliates | 38.7 | 33.7 | 111.7 | 95.2
Interest expense | 125.8 | 112.0 | 374.3 | 327.2
Wisconsin |  |  |  |
Segment information |  |  |  |
Operating revenues | 1,339.3 | 1,388.7 | 4,226.0 | 4,303.3
Illinois |  |  |  |
Segment information |  |  |  |
Operating revenues | 198.0 | 197.9 | 977.4 | 973.2
Other States |  |  |  |
Segment information |  |  |  |
Operating revenues | 48.9 | 50.2 | 302.9 | 292.5
Electric Transmission |  |  |  |
Segment information |  |  |  |
Other operation and maintenance | 0.0 | 0.0 | 0.0 | 0.0
Depreciation and amortization | 0.0 | 0.0 | 0.0 | 0.0
Operating income (loss) | 0.0 | 0.0 | 0.0 | 0.0
Equity in earnings of transmission affiliates | 38.7 | 33.7 | 111.7 | 95.2
Interest expense | 3.0 | 0.0 | $ 8.3 | 0.0
Non-Utility Energy Infrastructure |  |  |  |
Segment information |  |  |  |
Natural gas storage needs provided to Wisconsin utilities |  |  | 33.00% |
Operating revenues | 119.4 | 115.2 | $ 370.5 | 350.3
Other operation and maintenance | 3.9 | 3.0 | 14.5 | 9.2
Depreciation and amortization | 23.3 | 19.1 | 68.8 | 55.7
Operating income (loss) | 90.3 | 91.6 | 274.3 | 277.0
Equity in earnings of transmission affiliates | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 15.5 | 15.9 | 46.7 | 48.0
Corporate and Other |  |  |  |
Segment information |  |  |  |
Operating revenues | 1.3 | 2.4 | 3.9 | 6.9
Other operation and maintenance | 1.3 | (4.4) | 2.1 | (2.5)
Depreciation and amortization | 6.0 | 7.1 | 18.4 | 22.3
Operating income (loss) | (6.0) | (0.4) | (17.0) | (12.3)
Equity in earnings of transmission affiliates | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 35.9 | 32.9 | 107.5 | 91.2
Reconciling Eliminations |  |  |  |
Segment information |  |  |  |
Other operation and maintenance | 0.0 | (98.0) | 0.0 | (295.2)
Depreciation and amortization | (3.6) | 0.0 | (11.8) | 0.0
Operating income (loss) | (86.8) | 0.0 | (261.0) | 0.0
Equity in earnings of transmission affiliates | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | $ (88.5) | (1.3) | $ (267.1) | (3.2)
ATC | Electric Transmission |  |  |  |
Segment information |  |  |  |
Equity method investment, ownership interest (as a percent) | 60.00% |  | 60.00% |
ATC Holdco |  |  |  |
Segment information |  |  |  |
Equity method investment, ownership interest (as a percent) | 75.00% |  | 75.00% |
Equity in earnings of transmission affiliates | $ 0.4 | (0.9) | $ (0.5) | (2.6)
ATC Holdco | Electric Transmission |  |  |  |
Segment information |  |  |  |
Equity method investment, ownership interest (as a percent) | 75.00% |  | 75.00% |
Bishop Hill III Wind Energy Center | Non-Utility Energy Infrastructure |  |  |  |
Segment information |  |  |  |
WEC's ownership interest in Bishop Hill III Wind Energy Center | 90.00% |  | 90.00% |
Coyote Ridge Wind | Non-Utility Energy Infrastructure |  |  |  |
Segment information |  |  |  |
WEC's ownership interest in Coyote Ridge Wind, LLC | 80.00% |  | 80.00% |
Upstream | Non-Utility Energy Infrastructure |  |  |  |
Segment information |  |  |  |
WEC's ownership interest in Upstream Wind Energy Center | 80.00% |  | 80.00% |
Total utility revenues |  |  |  |
Segment information |  |  |  |
Other operation and maintenance | $ 524.0 | 652.5 | $ 1,566.8 | 1,891.2
Depreciation and amortization | 208.1 | 186.6 | 614.7 | 550.1
Operating income (loss) | 313.4 | 211.5 | 1,172.0 | 913.9
Equity in earnings of transmission affiliates | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 159.9 | 64.5 | 478.9 | 191.2
Total utility revenues | Wisconsin |  |  |  |
Segment information |  |  |  |
Other operation and maintenance | 400.2 | 525.0 | 1,156.8 | 1,495.9
Depreciation and amortization | 155.6 | 137.2 | 459.5 | 406.9
Operating income (loss) | 290.8 | 201.4 | 922.8 | 670.2
Equity in earnings of transmission affiliates | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 142.9 | 49.6 | 429.0 | 147.5
Total utility revenues | Illinois |  |  |  |
Segment information |  |  |  |
Other operation and maintenance | 101.8 | 104.5 | 337.0 | 320.8
Depreciation and amortization | 45.7 | 43.0 | 135.2 | 125.7
Operating income (loss) | 24.8 | 15.5 | 205.3 | 204.8
Equity in earnings of transmission affiliates | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 14.7 | 12.8 | 43.4 | 37.4
Total utility revenues | Other States |  |  |  |
Segment information |  |  |  |
Other operation and maintenance | 22.0 | 23.0 | 73.0 | 74.5
Depreciation and amortization | 6.8 | 6.4 | 20.0 | 17.5
Operating income (loss) | (2.2) | (5.4) | 43.9 | 38.9
Equity in earnings of transmission affiliates | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 2.3 | 2.1 | 6.5 | 6.3
External Revenues |  |  |  |
Segment information |  |  |  |
Operating revenues | 1,608.0 | 1,643.7 | 5,575.6 | 5,602.7
External Revenues | Electric Transmission |  |  |  |
Segment information |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0
External Revenues | Non-Utility Energy Infrastructure |  |  |  |
Segment information |  |  |  |
Operating revenues | 20.5 | 4.5 | 65.4 | 26.8
External Revenues | Corporate and Other |  |  |  |
Segment information |  |  |  |
Operating revenues | 1.3 | 2.4 | 3.9 | 6.9
External Revenues | Reconciling Eliminations |  |  |  |
Segment information |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0
External Revenues | Total utility revenues |  |  |  |
Segment information |  |  |  |
Operating revenues | 1,586.2 | 1,636.8 | 5,506.3 | 5,569.0
External Revenues | Total utility revenues | Wisconsin |  |  |  |
Segment information |  |  |  |
Operating revenues | 1,339.3 | 1,388.7 | 4,226.0 | 4,303.3
External Revenues | Total utility revenues | Illinois |  |  |  |
Segment information |  |  |  |
Operating revenues | 198.0 | 197.9 | 977.4 | 973.2
External Revenues | Total utility revenues | Other States |  |  |  |
Segment information |  |  |  |
Operating revenues | 48.9 | 50.2 | 302.9 | 292.5
Intersegment Transactions [Member] |  |  |  |
Segment information |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0
Intersegment Transactions [Member] | Electric Transmission |  |  |  |
Segment information |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0
Intersegment Transactions [Member] | Non-Utility Energy Infrastructure |  |  |  |
Segment information |  |  |  |
Operating revenues | 98.9 | 110.7 | 305.1 | 323.5
Intersegment Transactions [Member] | Corporate and Other |  |  |  |
Segment information |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0
Intersegment Transactions [Member] | Reconciling Eliminations |  |  |  |
Segment information |  |  |  |
Operating revenues | (98.9) | (110.7) | (305.1) | (323.5)
Intersegment Transactions [Member] | Total utility revenues |  |  |  |
Segment information |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0
Intersegment Transactions [Member] | Total utility revenues | Wisconsin |  |  |  |
Segment information |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0
Intersegment Transactions [Member] | Total utility revenues | Illinois |  |  |  |
Segment information |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0
Intersegment Transactions [Member] | Total utility revenues | Other States |  |  |  |
Segment information |  |  |  |
Operating revenues | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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