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.

Bayport – Pioneer Rebuild Project


Approximately 21 miles of 69,000-volt transmission line north of Green Bay, Wis., needs to be rebuilt and upgraded to 138-kV to serve the electric load in the area effectively and reliably. The 1910s-vintage lattice structures and wires have reached the end of their life cycle and will be replaced between the Bayport Substation in Brown County and the Pioneer Substation in Oconto County.

The project includes:

  • Replacing the transmission structures between Bayport and Pioneer substations with poles that support two 138-kV circuits,
  • Replacing the existing wires and installing a second set of wires, both to be operated at 138-kV, and
  • Making upgrades at the Bayport, Pioneer, Pulliam, Sobieski and Suamico substations.

The estimated $47 million project requires approval by the Public Service Commission of Wisconsin, which will conduct a review with public input. Additional information, including details of our regulatory filing, can be found at under docket number 137-CE-190.

Need for the project

These transmission lines were installed in the 1910s and have reached the end of their life cycle. Replacing and upgrading the lines to 138-kV will resolve age, technology, maintenance and related issues, and will help meet the electric needs of customers in the area effectively and reliably.

Project at a Glance
Area benefited:Northeastern Wisconsin
Line length:Approximately 21 miles
Voltage:138,000 volts
Estimated cost:Approximately $47 million
End points:The Bayport Substation in Brown County and the Pioneer Substation in Oconto County
PSC Docket ID:137-CE-190
Project Schedule
File regulatory application with PSCW May 2019
Regulatory reviewSummer/fall 2019
Anticipated approvalLate 2019
Detailed engineering/designLate 2019/early 2020
Begin construction activities Late 2020
In-service dateJune 2022
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