By The Business Journal of Milwaukee

American Transmission Co., which has invested about $2.5 billion in updating, improving and building electronic transmission systems in Wisconsin and surrounding states since 2001, plans to spend between $3.8 billion and $4.4 billion from this year through 2020.

The expenditures on the Wisconsin transmission system are included in the Pewaukee-based companyâ¿¿s new annual assessment of its future projects over the next 10 years. The company says the projects are needed to improve the adequacy and reliability of the electric transmission system for the region including in Wisconsin and upper Michigan with less-extensive forays into Illinois and Minnesota.

The expenditures consist of $1 billion in specific network projects, $1 billion in asset maintenance, $700,000 billion in what the company calls multi-benefits projects, and a range of $1.1 billion to $1.7 billion in other capital categories.

The next sizable southeast Wisconsin project on ATCâ¿¿s agenda is a proposed 6-mile, 345-kilovolt line between Pleasant Prairie and Zion, Ill., that the company says would reduce electrical transmission system congestion in southeast Wisconsin. That project is expected to be complete by 2014.

American Transmissionâ¿¿s owners include Wisconsin Energy Corp. (NYSE: WEC), Milwaukee.

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