ATC completes 104 mile transmission line project

De Pere, Wis., October 5, 2009 — The last portion of a project meant to improve reliability of the high-voltage electric system in central and northeast Wisconsin was placed into service recently.

Energizing the final leg of the Morgan-Werner West 345-kilovolt line completes a five-year effort to expand capacity and improve reliability in the area.

The two, 50+-mile lines received regulatory authorization in 2006 and started construction in fall of that year.

The project included a line from the Gardner Park Substation near Wausau to a new substation along Highway 22 north of Clintonville, and a line from the Morgan Substation in Oconto County to a new substation (Werner West) near New London.

About 75 miles of the project (from New London to Clintonville to Wausau) was placed in service ahead of schedule in June.

Energizing the last segment reduced overall electrical losses by about 14 megawatts — the equivalent of eight large wind turbines.

ATC owns, operates, builds and maintains the high-voltage electric transmission system serving portions of Wisconsin, Michigan, Minnesota and Illinois.

ATC has invested $2 billion to improve the adequacy and reliability of its infrastructure. ATC now is a $2.5 billion company with 9,350 miles of transmission lines and 510 substations.

The company is a member of the Midwest ISO regional transmission organization, and provides service to all customers, supporting competition in energy markets without favoring any market participant.

The project consisted of constructing 104 miles of double-circuit transmission line – 345-kV and 138-kV – on steel monopoles.

Two major 345- to 138-kV substations were built and modifications were made to five existing substations.

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