A pair of smokestacks at Ball State University in Muncie are coming down this summer. Their removal signals the final stages of an $83 million, multi-year project to replace the coal-fired boilers that used the stacks for exhaust with a closed-loop geothermal system at the state school in eastern Indiana.

https://magazine.bsu.edu/2017/01/09/ball-state-geothermal-project/