Winona is doubling down on combined heat and power.The Minnesota city on the Mississippi River installed its first CHP microturbine generator at its wastewater treatment plant in 2010. In spring of 2025, it replaced the original one and added a twin, both Capstone C65 models, like the original unit.The expansion wasn’t a hard decision, says Paul Drazkowski, wastewater superintendent. Tax credits and U.S. Department of Energy grants covered about 90% of the $637,000 cost, and the city’s digesters were producing more biogas than the plant could use efficiently with only one microturbine.The biogas cleaning infrastructure also had capacity to support
