American Transmission Co. projects

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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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Formed in 2001 as the nation’s first multi-state transmission-only utility, American Transmission Co. is a Wisconsin-based company that owns and operates 10,081 miles of electric transmission lines and 582 substations in portions of Wisconsin, Michigan, Minnesota and Illinois. Our transmission network enables the movement of electricity produced from all forms of generation resources to areas where it is needed – helping to keep the lights on, businesses running and communities strong. Visit our website at

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