GEOTHERMAL RESOURCES GLENWOOD SPRINGS, COLORADO

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GEOTHERMAL RESOURCES GLENWOOD SPRINGS, COLORADO ( geothermal-resources-glenwood-springs-colorado )

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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 outputs that could be obtained from the wells. Purchase of 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. Use 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 a backup heat pump/fossil fuel system is estimated at $200,000 for a 50,000 ft2 building. 4f. The City should conduct a survey of potential district heating system customers in order to determine the level of interest in participation. The survey would take approximately a week utilizing two workers. The employment of one unskilled person at $25/hr and one mechanical engineer at $100/hr should total about $5,000. 5. The City should drill a 1000-foot test well near the Community Center to determine the depth and temperature of the geothermal resource that could be utilized for meeting the heating needs of the building and pools. The estimated cost for the well and pump test is $200,000. 6. If, despite recommendation 3 above, power generation is a chosen option, then the federal tax incentive rules should be investigated to see whether the PTC or the ITC would be the better fit. One is only allowed to apply for one of these tax incentives. If the use of heat pumps is considered, then the ITC requirements should be investigated. Estimate $2,000 to perform the investigation. 53

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