GREEN BAY - American Transmission Co. wants to expand power lines in northern Wisconsin and Upper Michigan.

The Bay Lake Project will include a new substation in the Green Bay area.

From there, they plan two new lines that would run to an expanded substation near Ishpeming, Michigan and another to a substation near Oconto Falls.

Two other lines would run between the Menominee County and the Escanaba, Michigan, areas.

Preliminary costs run from $595 million to $895 million.

ATC is upgrading the system because of demand changes, reduced output from regional power plants and reliability concerns.

Michigan and Wisconsin regulators will have final approval and ATC officials anticipate the process could take years.

(Copyright 2012 by The Associated Press. All Rights Reserved.)