ATC is taking a four-phased approach to a project which involves upgrades to existing transmission lines and substations, and construction of new facilities. The end points are the Rock River Substation in the town of Rock and the Elkhorn Substation in the City of Elkhorn.

The existing 69-kilovolt transmission system that has served the areas in Rock and Walworth counties for several decades is no longer adequate to accommodate the growth in recent years and the expected growth in the future.

Modifications and additions to the system to convert it to a 138-kilovolt system will ensure reliable electric service. The entire conversion is expected to be completed in spring 2009.

                                          
Turtle to West Darien:
Modifications have been completed on this existing 18-mile, 69-kV line to allow for conversion to 138-kilovolt in spring 2009. The aging wood poles and wires between the Turtle Substation near the town of Beloit and the West Darien Substation on the southwest side of Darien were replaced with steel poles and new wires.

West Darien to SW Delavan:
This line was constructed in 2006-2007 mostly along new right-of-way that connects the West Darien Substation to a new Alliant Substation southwest of Delavan. This line currently operates at 69-kilovolts, but will be converted in spring 2009 to 138-kV. Read more.

SW Delavan to Bristol:
This phase, which was approved by the PSC in 2006, involves the construction of a new line mostly along Interstate 43 between Alliant's SE Delavan substation and the Bristol Substation northeast of Delavan. The first stage of construction began in November 2007 with some foundation work. This work will continue through winter 2008.  Poles will be placed and erected in spring 2008.   Read more.

Bristol - Delavan Voltage Conversion Upgrade:

The existing 1.5-mile transmission line through the City of Delavan between the Delavan Substation at 602 E. Wisconsin St. and the Bristol Substation at 6396 Mound Rd. will soon be upgraded from 69 kilovolts to 138 kilovolts. Read more.

Final Phase:
The final phase of the Rock River - Elkhorn Conversion, which was approved by the Public Service Commission, involves construction of a small line segment on the west end of the project between Rock River Substation and Turtle Substation, modifications to several substations along the entire line, and the ultimately the conversion to 138 kilovolts. This work will be done during 2008 and 2009.

For more information or to comment on this project, e-mail Mary Carpenter or call 1-866-899-3204, ext. 6922.