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 completes 17-mile transmission line project in southeastern Wisconsin

Jefferson County Reliability Project energized earlier this week

PEWAUKEE, Wis. – Seventeen miles of new 138,000-volt transmission line that improves the reliability of the high-voltage electric system in Jefferson County and eastern Dane County was placed into service Monday.

“This new infrastructure is providing much needed reinforcement to a transmission system that has had no significant improvements in the past 15 years,” says Mary Carpenter, ATC local relations representative. “The new line can better accommodate electric load growth in the community, and it creates an alternate path for electricity to flow in the event of an outage on another portion of the network.”

The line connects the Stony Brook Substation in Waterloo to the Jefferson Substation located outside the city of Jefferson.

“We appreciate the involvement and cooperation of the residents as we worked through the siting and construction issues on this line,” says Terry Henn, ATC project manager.

The project was introduced to the public in 2004, approved by the Wisconsin Public Service Commission in July 2006 and construction began in October 2008. Construction crews worked more than 40,000 hours over a one-year period with an exceptional safety record. The final project cost $30 million, $3.7 million less than the approved budget.

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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).