Overall Project Description
ATC plans to build a new substation in the village of Menomonee Falls, construct a new power line from Menomonee Falls to Wauwatosa, and rebuild and upgrade several existing lines in portions of Milwaukee, Washington and Waukesha counties.
The key elements of the project include:
- Building a new substation on property ATC currently owns in the village of Menomonee Falls near Mill and Marcy Roads.
- Constructing a new 138,000-volt power line from the proposed Mill Road Substation to the existing Butler Substation in Wauwatosa. We are proposing two route alternatives for this new line.
- Rebuilding power lines running from the proposed Mill Road Substation to an existing substation along 76th Street in Milwaukee. We are proposing to upgrade the voltage on one of the lines from 138-kV to 345-kV. During construction, a temporary 138-kV line would be installed on the south side of our existing lines for approximately one mile from the Mill Road Substation to the existing substation easy of Marcy Road.
- Replacing conductor wires on the existing power lines running north from the proposed Mill Road Substation to an existing substation in the village of Germantown. Certain structures (poles) would also be replaced.
- Make some upgrades to the line running south of the proposed Mill Road Substation south to an existing substation in New Berlin. Some structures (poles) may be replaced to bring the power line up to standards.
The project is estimated to cost approximately $400 million.
Overall Project Need
The project is needed to maintain reliability and support local energy demand and 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-212.
Project video
| Submit application to PSCW | Fall 2024 |
| Anticipated PSCW approval | Late 2025 |
| Construction begins | Summer 2026 |
| Construction and restoration complete | 2028 |
| *Dates are anticipated and subject to changes. |
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Why is this project necessary?
The project is needed to maintain reliability and support local energy demand.
Who decides if the route is needed and which route is chosen?
ATC is proposing to construct a new 138-kV power line from the proposed Mill Road Substation to the existing Butler Substation in Wauwatosa. We are required to propose two route alternatives for this new line. The Public Service Commission of Wisconsin is the regulatory agency with the authority to approve or deny major utility projects in Wisconsin. In this case, ATC will propose two routes and, if the power line project is approved, the PSCW will select the final route.
How much will the project cost and who is going to pay for it?
We anticipate the cost of the projects will be approximately $400 million. The cost of the project would be shared by all ATC customers.