From the conference announcement issued by the Energy Center of Wisconsin:

The Wisconsin Geothermal Association (WGA) conference will benefit anyone in the geothermal industry including engineers, designers, equipment dealers, and well drillers. With increasing public interest in geothermal technology, it is more important than ever that everyone in the industry maintain the highest standards possible. . . .

The WGA is a non-profit organization advocating for the usage of geothermal heating and cooling systems in Wisconsin. The WGA is a source of information for anyone interested in utilizing a geothermal system for a home, business, or school.
Geothermal systems have been proven to deliver excellent occupant comfort in this region, while saving energy and reducing emissions. The systems take advantage of the earth’s constant year-round ground temperature to provide heating, cooling and hot water in a variety of applications.

Conference registration.