Cooney-Summit 138-kV Rebuild Project
Project overview
The Cooney-Summit 138-kV Rebuild Project will replace switches at the Cooney Substation and rebuild the Cooney-Summit transmission line to replace aging equipment that is approaching the end of its lifespan. This line also requires additional capacity to support new solar generation planned in the region.
Rebuild projects help meet current and future electricity loads and support the safe and reliable operation of the electric system. The project runs through Oconomowoc, Wis., in Waukesha County.
Construction activities
The construction at Cooney Substation and facilities immediately adjacent to the substation was completed in the fall of 2021. The remaining four miles of existing transmission line will be rebuilt in late 2022 and early 2023. ATC will replace 38 existing wood structures with 37 steel monopole structures and one wood H-frame structure.
The Lake Country Trail is adjacent to the transmission line construction for the entire length of the project. To lessen the impact on this popular biking and hiking trail, it will be closed for construction during the fall and winter months between October 2022 and March 2023.
Anticipated schedule
| Phase 1 Construction (Complete) | September to November 2021 |
| Phase 2 Construction (In progress) | October 2022 to March 2023 |