Client: Hawthorne Army Depot
POWER conducted a direct use geothermal feasibility study at Hawthorne Army Depot for the Navy Geothermal Program Office. The study analyzed options for utilizing geothermal fluid based upon the temperature of available fluid from select test wells. The base currently heats more than 50 residences using steam from boilers. The study analyzed options for heating base residences by replacing the existing diesel-fueled boiler with a dedicated geothermal heating system. POWER hydrologists, geologists and mechanical engineers considered options for supplementing the boiler steam with hot geothermal fluid or replacing the existing diesel-fueled boiler with a dedicated geothermal heating system. The study team provided three potential scenarios for utilizing the geothermal fluid depending upon the results of test wells that are currently being drilled at the site. POWER provided recommendations for well locations, geothermal fluid gathering system constraints, boiler system and building modifications, and economic evaluation parameters. In addition, POWER presented concepts for delivery of the geothermal fluid from the wells to the boiler plant, and from the plant to injection wells. Summary cost estimates compared the utilization strategies, options for implementation, and payback period. The project has a viable payback period of 8 years if the results of the geothermal fluid tests yield a minimum temperature of 160 degrees F.