For nearly 70 years, coal-fired boilers have helped power the campus of Ball State University in Muncie in the U.S. state of Indiana. In just a matter of days those boilers will be turned off and the university will rely on what’s being touted as the world’s largest ground-source, closed-loop district geothermal energy system.
The $80 million conversion to geothermal power began in 2009. When completed next year, the system will heat and cool 47 buildings on campus.
