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building, a large lodge building with numerous well fur- nished rooms, six cabins, the pool/spa building, the Ice Mu- seum, the power plant building, airplane hangar, dog kennels and numerous other smaller buildings such as a massage and renewable energy center. The hot springs averages around 110oF (43oC) which are fed into an outdoor pool, and an in- door pool around 94oF (34oC). Several hot tubs are also available. The outdoor pool directly fed by the hot springs. At present there are 20 geothermal wells on the property, the deepest at around 1,010 feet (300 m) and producing up to 165oF (74oC). Much of the reservoir analysis and drilling supervision had been done by Dick Benoit of Sustainable Solutions, Reno, Nevada and David Blackwell of Southern Methodist University. All the buildings are heated with the geothermal waters, saving about $183,000 per year. Dick Benoit venting the main geothermal supply line to the power plant. GEOTHERMAL POWER PLANT The approximately 200 kW binary power plant was in- stalled at the resort in July 2006, and has been running ever since. The secondary fluid in the plant is R-134a, which has a lower boiling point than water and is heated by geothermal water at 500 gpm (32 L/s) through a heat exchanger at 165oF (74oC). Cooling water from a shallow well or infiltration gallery is around 40oF (4oC), providing a large temperature difference (“delta T”) which improves the efficiency of the system. The resort has used diesel generators in the past, GHC BULLETIN, SEPTEMBER 2006 since it is isolated from the electric grid, costing around 30 cents/kWh. The new power plant will provide 7 cents/kWh electricity, a major savings for the resort. The high cost of diesel energy and the large “delta T” certainly makes this unit economical. Maintenance is estimated to be $50,000 per year. The unit uses Carrier chiller components to dra- matically reduce the cost of production and allow for modu- lar construction. The total unit cost around $1,500 per in- stalled kW. Plans are to add another 200 kW unit, and short- lyreachoneMW. BernieKarlislookingatexpansioninthe future, depending upon on sustainable production from the geothermal resource, however, the bar has been lowered from around 208oF (98oC) to 165oF (74oC) for geothermal electric power generation (see Geo-Heat Center Quarterly Bulletin, Vol. 26, No. 2 – September 2005 for a description of other lower temperature combined heat and power uses at http://geoheat.oit.edu/bulletin/bull26-2/bull26-2.pdf). The insulated supply and disposal pipelines for the power plant are each about 3,000 ft. (1,000 m) long, but fortunately, the cold water supply is gravity fed from a large collection gallery, thus there is no pumping cost for the condenser side of the plant. The Ice Museum chess set. The 200kW United Technologies power plant. THE AURORA ICE MUSEUM The Aurora Ice Museum was built as a way to boost tour- ism at the resort, along with offering year-round employment for many of the ice artists in the area. The museum, a struc- ture made of ice blocks cut from a local beaver pond in win-PDF Image | Caribeean Plate Geothermal Plants
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