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3. Electric power generation is a very marginal option due to the high risk and cost. However, if a significant grant is available, the first step of drilling a deep well to investigate the potential for an 180o F or higher geothermal resource should be considered. The cost of drilling a 4,000-foot deep well would be around $3,000,000. 4. Installation of a geothermal district heating system in either the downtown core area or for a concentration of governmental or institutional buildings appears to be feasible. However, prior to planning for a geothermal district heating system, the following investigations should be performed to determine the best option for supply of the thermal energy to the system. 4a. A production and an injection well should be drilled and tested for possible use in a district heating system. Either the Wright or the Redstone well could be used as the production well. A long term test (one week) should include monitoring of Yampah Spring and any other wells in the area for effects on drawdown and temperature. Pumping and injection rates should vary, in steps, from 100 to 500 gpm. A geologist or groundwater engineer should be consulted for the location of these well(s). A 600-foot production and injection well would cost $150,000 to drill. A one week test would cost around $100,000 including rental of a well pump, data gathering and analysis. 4b. A downhole heat exchanger loop of 2- or 3- inch diameter pipe should be tested for at least a week in both the Wright and Redstone wells to determine the thermal energy output that could be obtained from the well. 800 feet of downhole heat exchanger pipe for the Wright well would cost $7,500 for the material and installation, and an additional $2,000 for monitoring and reporting the results. 4c. The City should investigate the possibility of using the waste water from the Yampah Springs cistern and the Pool. Utilization of the waste water system by constructing a pipeline under the river should cost between $400,000 and $500,000, depending on the source utilized. If the pipeline were to be hung underneath a bridge the cost would be $50,000 to $100,000 less. 4d. One or more thermal conductivity tests, in holes ~250 feet deep, should be performed in the vicinity of the downtown core area to determine the potential design for a closed loop geothermal heat pump system. A thermal conductivity test could be run for 48 hours and cost $11,000 per hole ($5,500 for the equipment and $5,500 for drilling, setting the pipe and grouting the hole.). A geothermal heat open loop heat pump system supplying an entire block (100% hookup) would cost $1,065,000 and provide a net income of $60,000/year and a closed loop system would cost $1,752,000 and provide a net income of $65,000/year. A geothermal heat pump system for a 50,000 ft2 building would range from $275,000 for an open loop system to $493,000 for a closed loop system. 4e. The City should investigate potential sites for using a Slim Jim® or slinky coil for space heating as described in the Hybrid section. A shallow aquifer with sufficient groundwater flow is necessary for the implementation of this concept. The cost of installing this system with backup heat pump/fossil fuel system is estimated at $200,000 for a 50,000 ft2 building. 5PDF Image | GEOTHERMAL RESOURCES GLENWOOD SPRINGS, COLORADO
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