American Transmission Co. projects

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Saukville – St. Lawrence rebuild is complete

Newly energized electric transmission line moves power; boosts reliability
ATC’s Saukville-St. Lawrence line supports output from Port Washington Generating Station

PEWAUKEE, WIS. – An existing 138-kilovolt electric transmission line between the Saukville Substation and the St. Lawrence Substation (located northeast of Slinger in the town of Hartford) was returned to service by American Transmission Co. following a year-long upgrade project.

The 19-mile line was energized last week following a year of construction activities to replace 60-year old poles and wires. “This work was done in part to address issues related to the age and condition of the facilities,” said Mary Carpenter, local relations representative. “The upgrade was also necessary to accommodate the additional output from the Port Washington Generating Station when the first of two new units is soon placed in service by We Energies.”

The need for a heaver-weight wire to carry more electricity called for the construction of stronger structures (poles). In general, the new structures were placed in the same position as the old structures. “Moving power from the generation source to where it’s needed was the goal of this project,” explained Carpenter. “This line also will strengthen reliability throughout the area.”

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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).