Colby College overlooks the Kennebec River valley and city of Waterville. In 2013 Colby became the fourth college in the country to achieve carbon neutrality. Colby uses 100-percent renewable electricity, has 12 LEED-certified buildings (other certifications pending), has geothermal heating and cooling in two buildings, and has a biomass plant that burns sustainably harvested wood to heat most campus buildings.