The ground loop heat exchange system on the 1,100-acre campus of Epic Systems Corporation, in Verona, Wisconsin, is among the largest in North America. Planning, design, and implementation to date by Salas O’Brien totals 21,300 tons capacity, using 6,200 bores from 300 to 500 feet deep, a 5.8-acre pond of 1,296 loops, an 18,000 GPM open loop system, and a central pump station transferring energy among buildings, distribution energy plants, ponds, and borefields.