WEC · 10-Q · 2026Q3 · Full report

Transmission Infrastructure Investment

WEC ENERGY GROUP, INC. · 2026-10-30 · Importance 46 · Surprise 42

WEC expects to contribute approximately $820 million to ATC from 2026 through 2028 and does not expect contributions to ATC Holdco during that period. Its share of MISO Tranche 1 and Tranche 2.1 investment is estimated at approximately $500 million and $700 million, respectively, between 2027 and 2031. The MISO projects are intended to upgrade the grid to accommodate the shift toward lower-carbon generation and improve reliability.

Key facts

• WEC Energy Group expects total capital contributions to ATC of approximately $820 million from 2026 through 2028 and expects no contributions to ATC Holdco during that period. source
• WEC Energy Group's share of investment in MISO Tranche 1 and Tranche 2.1 is estimated at approximately $500 million and $700 million, respectively, between 2027 and 2031. source
• WEC Energy Group forecasts its share of ATC’s projected capital expenditures over the next five years at approximately $5.3 billion. source
• Wisconsin transmission expense increased $48.8 million as approved by the PSCW in rate orders effective January 1, 2026. source
• Capital contributions paid to transmission affiliates increased $30.6 million during the nine months ended September 30, 2026. source