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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 7. HOT WATER SUPPLY AND REINJECTION SYSTEM 7.1 Chena Geothermal Resource All available geothermal waters in the vicinity of Chena Hot Springs have been sampled and analyzed for their basic brine chemistry, stable isotopes, total organic carbon and dissolved inorganic carbon as part of the DOE funded GRED III project. The basic chemistry of waters near Chena Hot Springs falls into two distinct end members connected by a mixing trend. The end members are very dilute cold surface or near- surface water and more saline thermal water, with a few samples being variable mixtures of the two end members. The Chena thermal spring waters are quite dilute for thermal waters, having a total dissolved content of only 300 to 388 mg/l, with a pH near 9. This has made selecting materials for the power plant heat exchangers somewhat easier than usual for a geothermal fluid, however there are still concerns about the sulfur content and reactions with the copper alloy in the evaporator units. This may cause some minor scaling and ultimately it may be necessary to inject a surfactant into the hot water supply, as is common in many other geothermal installations. This issue is still being researched. Quartz and Na-K-Ca geothermometers predict temperatures as high as 278 and 263 oF respectively as the base temperature of a deeper resource at Chena. These temperatures are expected to be accessed at depths of 1500 to 2500ft, according to the model developed through the Chena GRED III project (Figure 11 below). 22PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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