PROJECT STATUS: Submitted application to the Public Service Commission of Wisconsin in September 2025.
Project Overview
ATC is proposing an expansion and upgrade of our electric system that would include building new power lines, rebuilding existing power lines, constructing up to five new substations and maintenance work on sections of existing power lines. The project would include parts of Calumet, Fond du Lac, Sheboygan, Ozaukee and Washington counties in east central Wisconsin.
Project Need
The proposed project is needed to reliably serve a load interconnection request by We Energies to serve a new large load addition in the Port Washington area, and maintain the safe and reliable operation of ATC’s system.
The project is subject to approval by the Public Service Commission of Wisconsin.
Additional information about the proposed project can be found on the Public Service Commission of Wisconsin website, under docket number 137-CE-221.
Project Highlights
Rebuilding and upgrading existing lines from the Forest Junction Substation east of Appleton to a new proposed Sheboygan River Substation east of Fond du Lac.
- The Preferred Route would involve a rebuild of an existing single circuit line to a dual-circuit line largely within the existing utility corridor.
- The Alternate Route would involve building a new line adjacent to an existing corridor, where possible, and in new corridors where it’s not possible.
Rebuilding and upgrading existing lines to connect a new proposed Mullet River Junction Substation near Sheboygan Falls with a new proposed Cedar Creek Junction Substation west of Saukville.
- Preferred Route – Rebuild the existing single-circuit 345-kV line as a dual-circuit 345-kV line.
- Preferred Route – Construct a new dual-circuit 345-kV line from the town of Saukville to meet with existing power lines about 9 miles to the west.
- Alternate Route – Rebuild an existing dual-circuit 138/345-kV line to a dual-circuit 345-kV line.
- Alternate Route – Construct two new 138-kV power lines from the existing Holland Substation to a new proposed Adell Substation south of Adell.
Constructing two new dual-circuit lines (four lines) between a new proposed Decker Substation in Port Washington to the existing transmission system
Building up to 5 new substations and completing minor remote end substation work.
Maintenance work on sections of existing power lines through structure replacements, burial of distribution spans or amp-jacking structures.
