Construction on a new 345,000-volt power line in the Town of Beloit is slated to begin this fall, according to a spokeswoman for American Transmission Company. The power line will suspend wires above several properties just south of Finley Road between the Rock River and Gesley Road. The line will span 4.2 miles and connect via a substation to Alliant Energy’s new West Riverside Energy Center, a $700 million power plant under construction near Town Line Road.