Geothermal Environmental Effects

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Geothermal Environmental Effects ( geothermal-environmental-effects )

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Environmental Impacts, Attributes, and Feasibility Criteria 8.2.12 Catastrophicevents Figure 8.5 Aerial view of the Heber Double­Flash plant, Calif. (Google Earth, 2006). 8­15 Chapter 8 8.2.13 Thermalpollution Accidents can occur during various phases of geothermal activity including well blowouts, ruptured steam pipes, turbine failures, fires, etc. This is no different from any other power generation facility where industrial accidents unfortunately can and do happen. The ones that are unique to geothermal power plants involve well drilling and testing. In the early days of geothermal energy exploitation, well blowouts were a fairly common occurrence; but, nowadays, the use of sophisticated and fast­acting blowout preventers have practically eliminated this potentially life­ threatening problem. Furthermore, geothermal prospects are now more carefully studied using modern geoscientific methods before well drilling commences. In the case of EGS projects, it will be critical to study and characterize the nature of any potential site before any development begins. This will minimize the chances for a catastrophic event related to the drilling phase. Proper engineering and adherence to standard design codes should also minimize, if not completely eliminate, any chance of a mechanical or electrical failure that could cause serious injury to plant personnel or local inhabitants. Although thermal pollution is currently not a specifically regulated quantity, it does represent an environmental impact for all power plants that rely on a heat source for their motive force. Heat rejection from geothermal plants is higher per unit of electricity production than for fossil fuel plants or nuclear plants, because the temperature of the geothermal stream that supplies the input thermal energy is much lower for geothermal power plants. Considering only thermal discharges at the plant site, a geothermal plant is two to three times worse than a nuclear power plant with respect to thermal

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