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.

Sturgeon Bay Submarine Cable Replacement Project

Project overview

Wisconsin’s lower Door County and upper Door County have been connected electronically for decades by a  69,000-volt submarine transmission line. This connection is critical to electric reliability in the Door County peninsula. ATC will establish a new 69,000-volt circuit under the Sturgeon Bay Ship Channel, approximately one half mile in length.

Project need

One circuit, comprised of  four cables, was installed under the Sturgeon Bay Ship Channel in the early 1980s in conjunction with the installation of the city of Sturgeon Bay’s water main. The cables are reaching the end of their lifecycle and must be replaced to ensure electric reliability in Door County. Permits were obtained from the U.S. Army Corps of Engineers, the Wisconsin Department of Natural Resources and other local entities. The cost of the project is estimated to be $12.5 million.

Roads closed for construction

Beginning the week of Aug.10, 2020, some Sturgeon Bay roads and parking lots will be closed to allow for installation of new transmission line cables beneath the Sturgeon Bay Ship Channel.

  • The City of Sturgeon Bay parking lot on Nebraska Street, between First and Second Avenues, will be closed Aug. 10, 2020, through May 2021.
  • First Avenue between Nebraska and Oregon Streets will be closed for construction Mid-December 2020 through end of May 2021.

Local officials, along with local law enforcement, have been notified of the work. In the interest of safety, the public should remain a safe distance of 50 feet away from construction equipment and crews.

Drill for installation of new cablesSummer/Fall 2020
Install new cables Winter 2021 through Spring 2021
In serviceMay/June 2021

Why do you need to close the roads for so long?

Installing new high-voltage transmission line cables beneath the Sturgeon Bay Ship Channel is a complex project. It involves drilling a path under the channel, installing the cable itself and electrically connecting the cables to two substations on either side of the river.

What will be done with the existing cables?

The existing cables are anchored to an active Sturgeon Bay Utilities water main. After discussions with Sturgeon Bay Utilities, it was determined to be less disruptive if the four existing cables remain where they are.