American Transmission Co. projects

Project website for a Wisconsin-based company that owns and operates the high-voltage electric transmission system that powers communities in portions of the Upper Midwest.

This project involved the construction of approximately 17 miles of new 138-kilovolt transmission line connecting the Stony Brook Substation in Waterloo to the Jefferson Substation located outside the city of Jefferson. Upgrades to several area substations and an upgrade to an existing line from the Stony Brook Substation to the Box Elder Substation in Medina also was part of the project.

The population of Jefferson County has grown by 14 percent since 1990 and is projected to continue to grow. This growth translates to a higher demand for electricity. During the past 15 years, there have been no significant improvements made to the transmission system in the area, and electricity supply constraints will worsen if the transmission system is not reinforced to accommodate the electric growth. This project improved the ability to ensure continued electric service in the event of an outage on a portion of the network by creating an alternate path for electrical flow.

ATC was required to submit two route alternatives as part of its construction application to the Public Service Commission of Wisconsin. The PSC approved the project July 20, 2006.

Project at a Glance
Communities affected:Towns of Waterloo, Medina, Aztalan, the City of Lake Mills, and the Town of Lake Mills. The substation wil be located in the town of Jefferson. All of Jefferson County and eastern Dane County will benefit from a stronger electric transmission system.
Line length:Approximately 17 miles
Voltage:138,000 volts
Final cost:$30 million, $3.7 million less than the approved budget
End points:Stony Brook Substation in Waterloo and Jefferson Substation outside of Jefferson
Open houses to present final routes:Summer 2005
Submitted application to Public Service Commission:Summer 2005
Receive PSC decision:July 2006
Began construction:Fall 2008
In-service date:October 2009