Carleton’s clean energy journey began with construction of our two wind turbines (installed in 2004 and 2011) which put us on a path to consuming carbon-free electricity. But we needed solutions to drive down carbon emissions, and we were particularly interested in finding low carbon ways to serve our intense winter heating loads. Our Utility Master Plan (UMP) made huge gains on that front by transitioning Carleton’s district heating system from steam distribution to low temperature (120 F) hot water tied to a geothermal heat pump and three geothermal bore fields.