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Electric Power Generation. The main problem associated with installing a 280 kW binary plant using the expected 180oF resource, is the drilling risk and cost. We anticipated drilling to about 4,000 feet at a cost of ~$3,000,000. At the higher selling price for the electricity, $0.07/kWh, the simple payback is 47 years. Taking into account the risk of drilling a successful well, this system is not recommended. District Heating Using a Production and an Injection Well. The capital investment costs are high; however, the simple paybacks are reasonable, ranging from 9 to 16 years depending upon the customer sign-up rate for hookups. The locations of the production and injection wells are critical and would require the advice of a geologist or ground- water engineer. The other concern would be the likelihood of achieving at least a 50% customer penetration rate, as retrofits may be difficult for some buildings and thus not be economical. Downhole Heat Exchanger (DHE). This analysis was based on using one well with two different energy outputs. Unfortunately, we do not know what a well of around 122oF will produce in terms of Btu/hr in Glenwood Springs. The main advantage of using a DHE is that only heat energy is removed from the water, thus no water is extracted from the resource. The main disadvantage is the limited energy output and the resultant high simple payback in years. This would limit its use to a single school, a commercial or government building, or a number of individual homes, as is done in Klamath Falls. Waste Water Resource. The main advantage of using this resource, obtained from the Yampah Spring and the Pool, is that it is available and not being used, so that the risk is low and there would be no additional impact on the geothermal resource. The capital investment cost is somewhat high, but the simple payback is under four years for both cases, the best of the alternatives investigated. Geothermal Heat Pump – Open Loop. The main advantage is that this system provides both heating and cooling. The other advantage is that the number of wells can be adjusted to the penetration rate for hookups, with more wells added at a later date as demand increases. The costs were based on using wells that could produce 150 gpm. Costs are high due to the required drilling of an equal number of production and injection wells. If more flow could be obtained, and/or fewer injection wells used, then the cost would be lower. By using shallow wells, estimated at 300 feet, their impact on the geothermal resource may be insignificant. Simple payback is between 18 and 19 years. Geothermal Heat Pump – Closed Loop. The two main advantages are that the system provides both heating and cooling, and does not pump fluid, but only extracts or rejects heat to the ground. Also, the number of holes drilled can be adjusted to the penetration rate for hookups, with more holes added at a later date as demand increases. The capital cost is very high, thus simple paybacks are also high at 27 years. This system has been utilized successfully in Glenwood Springs by a local architect. 45PDF Image | GEOTHERMAL RESOURCES GLENWOOD SPRINGS, COLORADO
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