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Segment Information | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
SEGMENT INFORMATION | SEGMENT INFORMATION We use operating income to measure segment profitability and to allocate resources to our businesses. At December 31, 2018, we reported six segments, which are described below.
• | The Wisconsin segment includes the electric and natural gas utility operations of WE, WG, WPS, and UMERC.
• | The Illinois segment includes the natural gas utility and non-utility operations of PGL and NSG.
• | The other states segment includes the natural gas utility and non-utility operations of MERC and MGU.
• | 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 invests 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, our 90% membership interest in Bishop Hill III, a wind generating facility located in Henry County, Illinois, and our 80% membership interest in Coyote Ridge, a wind generating facility under construction in Brookings County, South Dakota. See Note 2, Acquisitions, for more information on Bluewater, Bishop Hill III, and Coyote Ridge.
• | The corporate and other segment includes the operations of the WEC Energy Group holding company, the Integrys holding company, the PELLC holding company, Wispark, Bostco, Wisvest, WECC, WBS, PDL, and ITF. In the first quarter of 2017, we sold substantially all of the remaining assets of Bostco, and, in October 2018, Bostco was dissolved. In the second quarter of 2016, we sold certain assets of Wisvest, which no longer has significant operations, and in the first quarter of 2016, the sale of ITF was completed. See Note 3, Dispositions, for more information on these sales.
All of our operations and assets are located within the United States. The following tables show summarized financial information related to our reportable segments for the years ended December 31, 2018, 2017, and 2016.
|  | Utility Operations |  |  |  |  |  |  |  |  |  |
2018 (in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Total Utility Operations |  | Electric Transmission |  | Non-Utility Energy Infrastructure |  | Corporate and Other |  | Reconciling Eliminations |  | WEC Energy Group Consolidated
External revenues |  | $ | 5,794.7 |  |  | $ | 1,400.0 |  |  | $ | 438.2 |  |  | $ | 7,632.9 |  |  | $ | — |  |  | $ | 37.9 |  |  | $ | 8.7 |  |  | $ | — |  |  | $ | 7,679.5 |
Intersegment revenues |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 430.5 |  |  | — |  |  | (430.5 | ) |  | — |
Other operation and maintenance |  | 2,076.1 |  |  | 472.3 |  |  | 101.0 |  |  | 2,649.4 |  |  | — |  |  | 12.6 |  |  | 1.8 |  |  | (393.3 | ) |  | 2,270.5 |
Depreciation and amortization |  | 546.6 |  |  | 170.3 |  |  | 24.1 |  |  | 741.0 |  |  | — |  |  | 75.7 |  |  | 29.1 |  |  | — |  |  | 845.8 |
Operating income (loss) |  | 800.2 |  |  | 255.8 |  |  | 68.8 |  |  | 1,124.8 |  |  | — |  |  | 365.8 |  |  | (22.2 | ) |  | — |  |  | 1,468.4 |
Equity in earnings of transmission affiliates |  | — |  |  | — |  |  | — |  |  | — |  |  | 136.7 |  |  | — |  |  | — |  |  | — |  |  | 136.7 |
Interest expense |  | 200.7 |  |  | 51.2 |  |  | 8.7 |  |  | 260.6 |  |  | 0.3 |  |  | 63.7 |  |  | 125.8 |  |  | (5.3 | ) |  | 445.1 |
Capital expenditures and asset acquisitions |  | 1,466.1 |  |  | 547.1 |  |  | 103.6 |  |  | 2,116.8 |  |  | — |  |  | 260.6 |  |  | 39.7 |  |  | — |  |  | 2,417.1 |
Total assets * |  | 23,407.0 |  |  | 6,483.3 |  |  | 1,147.9 |  |  | 31,038.2 |  |  | 1,665.3 |  |  | 3,227.2 |  |  | 959.6 |  |  | (3,414.5 | ) |  | 33,475.8 |
* | Total assets at December 31, 2018 reflect an elimination of $1,968.5 million for all lease activity between We Power and WE.
|  | Utility Operations |  |  |  |  |  |  |  |  |  |
2017 (in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Total Utility Operations |  | Electric Transmission |  | Non-Utility Energy Infrastructure |  | Corporate and Other |  | Reconciling Eliminations |  | WEC Energy Group Consolidated
External revenues |  | $ | 5,829.2 |  |  | $ | 1,355.5 |  |  | $ | 411.2 |  |  | $ | 7,595.9 |  |  | $ | — |  |  | $ | 38.9 |  |  | $ | 13.7 |  |  | $ | — |  |  | $ | 7,648.5 |
Intersegment revenues |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 446.3 |  |  | — |  |  | (446.3 | ) |  | — |
Other operation and maintenance (1) |  | 1,923.2 |  |  | 464.2 |  |  | 101.1 |  |  | 2,488.5 |  |  | — |  |  | 7.3 |  |  | 1.4 |  |  | (441.1 | ) |  | 2,056.1 |
Depreciation and amortization |  | 523.9 |  |  | 152.6 |  |  | 24.8 |  |  | 701.3 |  |  | — |  |  | 71.4 |  |  | 25.9 |  |  | — |  |  | 798.6 |
Operating income (loss) (1) |  | 1,055.2 |  |  | 279.9 |  |  | 54.4 |  |  | 1,389.5 |  |  | — |  |  | 400.5 |  |  | (13.9 | ) |  | — |  |  | 1,776.1 |
Equity in earnings of transmission affiliates |  | — |  |  | — |  |  | — |  |  | — |  |  | 154.3 |  |  | — |  |  | — |  |  | — |  |  | 154.3 |
Interest expense |  | 193.7 |  |  | 45.0 |  |  | 8.7 |  |  | 247.4 |  |  | — |  |  | 62.8 |  |  | 107.3 |  |  | (1.8 | ) |  | 415.7 |
Capital expenditures |  | 1,152.3 |  |  | 545.2 |  |  | 74.5 |  |  | 1,772.0 |  |  | — |  |  | 35.4 |  |  | 152.1 |  |  | — |  |  | 1,959.5 |
Total assets (2) |  | 22,237.1 |  |  | 6,144.7 |  |  | 1,067.8 |  |  | 29,449.6 |  |  | 1,593.4 |  |  | 2,992.8 |  |  | 953.6 |  |  | (3,398.9 | ) |  | 31,590.5 |
(1) | Includes the retroactive restatement impacts of the implementation of ASU 2017-07. See Note 18, Employee Benefits, for more information on this new standard.
(2) | Total assets at December 31, 2017 reflect an elimination of $2,038.1 million for all lease activity between We Power and WE.
|  | Utility Operations |  |  |  |  |  |  |  |  |  |
2016 (in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Total Utility Operations |  | Electric Transmission |  | Non-Utility Energy Infrastructure |  | Corporate and Other |  | Reconciling Eliminations |  | WEC Energy Group Consolidated
External revenues |  | $ | 5,805.4 |  |  | $ | 1,242.2 |  |  | $ | 376.5 |  |  | $ | 7,424.1 |  |  | $ | — |  |  | $ | 24.9 |  |  | $ | 23.3 |  |  | $ | — |  |  | $ | 7,472.3 |
Intersegment revenues |  | 0.3 |  |  | — |  |  | — |  |  | 0.3 |  |  | — |  |  | 423.3 |  |  | — |  |  | (423.6 | ) |  | — |
Other operation and maintenance (1) |  | 2,034.6 |  |  | 463.6 |  |  | 108.8 |  |  | 2,607.0 |  |  | — |  |  | 4.3 |  |  | (16.4 | ) |  | (423.6 | ) |  | 2,171.3 |
Depreciation and amortization |  | 496.6 |  |  | 134.0 |  |  | 21.1 |  |  | 651.7 |  |  | — |  |  | 68.3 |  |  | 42.6 |  |  | — |  |  | 762.6 |
Operating income (loss) (1) |  | 1,017.8 |  |  | 261.1 |  |  | 51.2 |  |  | 1,330.1 |  |  | — |  |  | 375.6 |  |  | (9.4 | ) |  | — |  |  | 1,696.3 |
Equity in earnings of transmission affiliate |  | — |  |  | — |  |  | — |  |  | — |  |  | 146.5 |  |  | — |  |  | — |  |  | — |  |  | 146.5 |
Interest expense |  | 180.9 |  |  | 38.9 |  |  | 8.5 |  |  | 228.3 |  |  | — |  |  | 62.1 |  |  | 120.9 |  |  | (8.6 | ) |  | 402.7 |
Capital expenditures |  | 910.9 |  |  | 293.2 |  |  | 59.5 |  |  | 1,263.6 |  |  | — |  |  | 62.3 |  |  | 97.8 |  |  | — |  |  | 1,423.7 |
Total assets (2) |  | 21,730.7 |  |  | 5,714.6 |  |  | 995.1 |  |  | 28,440.4 |  |  | 1,476.9 |  |  | 2,777.1 |  |  | 778.0 |  |  | (3,349.2 | ) |  | 30,123.2 |
(1) | Includes the retroactive restatement impacts of the implementation of ASU 2017-07. See Note 18, Employee Benefits, for more information on this new standard.
(2) | Total assets at December 31, 2016 reflect an elimination of $2,029.5 million for all lease activity between We Power and WE.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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