American Transmission Co. projects

Project website for a Wisconsin-based company that owns and operates the high-voltage electric transmission system that powers communities in portions of the Upper Midwest.

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ATC seeks approval to rebuild 14-mile, 138-kV transmission line

Project needed to replace aging lines, strengthen area reliability

PEWAUKEE, Wis. – American Transmission Co. today filed an application with the Public Service Commission of Wisconsin to rebuild an existing 14-mile, 138,000-volt transmission line in southeastern Wisconsin. The proposed St. Martins-Edgewood-Mukwonago Rebuild Project runs from the St. Martins Substation in Franklin to the Edgewood Substation in Big Bend and continues on to the Mukwonago Substation, in Mukwonago.

“The lattice tower structures, which are approximately 90 years old, will be replaced with steel single-pole structures; and the wires also will be replaced,” said Mary Carpenter, senior local relations representative for ATC. “The new poles will be placed within a few feet of the existing structures, and no new right-of-way is anticipated for the project.”

Regulatory approval of this project is expected in fall 2015 with construction beginning in 2017 to meet an in-service date of 2018.

Note to editors: Additional details are available on the PSC’s website under Docket No. 137-CE-180. A map of the proposed project and additional information can found at

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ATC is a Wisconsin-based company that moves energy along the regional electric grid in parts of Wisconsin, Michigan, Minnesota and Illinois, serving more than 5 million electric consumers. We are experts at what we do: planning, maintaining, operating and protecting the grid. As the electric industry moves toward renewable generation sources, we are transforming our system to continue delivering energy reliably and safely. We proudly support STEM education programs that empower youth with the skills needed to succeed in tomorrow’s energy workforce. For more information, visit and follow us on LinkedIn and X (Twitter).