American Transmission Puts High-voltage Line In South Central Wisconsin Into Service

Published: 16-Mar-2010

American Transmission (ATC) has put into service a 35-mile high-voltage electric transmission line in south central Wisconsin that provides local electric utilities with access to the regional energy market to buy and sell electricity when it is economic to do so.

The 345kv circuit was built on an existing transmission line right-of-way between the Rockdale Substation in the Town of Christiana in Dane County and the Paddock Substation located in the Town of Beloit in Rock County. The lines that extend south out of the Paddock Substation into Illinois create a path for importing power into Wisconsin.

Flora Flygt, director of Transmission Planning, said: "Paddock-Rockdale is the first transmission line project within the footprint of the Midwest Independent System Operator that was justified on economics. Until this project, transmission lines in the region have almost exclusively been built to enhance reliability of electric power in the area. Although improved reliability will be a by-product of the project, economics drove the decision to build."

She added, "The primary benefit of this line is local electric distribution companies now have greater ability to participate in the wholesale electricity market. Wisconsin has fewer transmission line connections to other states compared with its neighboring states.

"This transmission congestion limits the ability of electric utilities to access the market to purchase lower-cost electricity when prices are lower and sell into the market when prices are higher. The economic benefits of enhanced access can be passed on to end-use customers. The Paddock-Rockdale project provides the needed transmission capacity for today’s energy marketplace, especially with the growing movement toward renewable energy."

The Paddock-Rockdale project was completed ahead of schedule, and within the approved $133m budget. Anticipated savings from the project are expected to more than pay for its development.

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