CARBONDALE COMMUNITY GEOTHERMAL COALITION—REPLICABLE MODELS FOR DECARBONIZING MIXED-USE RURAL COMMUNITIES IN COLD CLIMATES DESIGN A FIFTH-GENERATION GEOTHERMAL DISTRICT HEATING AND COOLING (5G ) SYSTEM THAT CAN INITIALLY SUPPLY 25% OF THE 32 ZERO ENERGY DISTRICT’S (32ZED) HEATING AND COOLING NEEDS AND SCALE TO SUPPLY 100% OF ITS NEEDS. THE 32ZED COMPRISES THE CARBONDALE BRANCH LIBRARY, THE ROARING FORK SCHOOL DISTRICT’S CARBONDALE OFFICES, 20 AFFORDABLE HOUSING UNITS FOR TEACHERS, BRIDGES HIGH SCHOOL, THE THIRD STREET CENTER, AND THE 20 TOWNHOMES ON 2ND STREET . THE INITIAL DEPLOYMENT CONTEMPLATED FOR BUDGET PERIOD 2 IS A RETROFIT OF BOTH THE 45,100 SQ FT. THIRD STREET CENTER AND THE 2ND STREET TOWNHOMES , WHICH WOULD ELIMINATE APPROXIMATELY 3.2 BILLION BTU/YR OF NATURAL GAS CONSUMPTION OR 56% OF THE 32ZED’S NATURAL GAS CONSUMPTION. IT IS CURRENTLY ENVISIONED THAT SUBSEQUENT DEPLOYMENTS WILL INCORPORATE THE OTHER BUILDINGS OF THE 32ZED; HOWEVER, IT IS POSSIBLE THAT MORE BUILDINGS WILL BE READY TO JOIN THE SYSTEM IN PERIOD 2. THE PRECISE DEPLOYMENT TIMING WILL BE DETERMINED ALONG WITH THE MEMBERS OF THE 32ZED ONCE THE DESIGN AND THE TECHNICAL/FINANCIAL PLAN IS DEVELOPED.