Geothermal electricity

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Geothermal electricity ( geothermal-electricity )

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Geothermal electricity 5 Papua-New Guinea 56 56 Guatemala 53 52 Portugal 23 29 China 27.8 24 France 14.7 16 Ethiopia 7.3 7.3 Germany 8.4 6.6 Austria 1.1 1.4 Australia 0.2 1.1 Thailand 0.3 0.3 TOTAL 9,731.9 10,709.7 Environmental impact Fluids drawn from the deep earth carry a mixture of gases, notably carbon dioxide (CO2), hydrogen sulfide (H2S), methane (CH4) and ammonia (NH3). These pollutants contribute to global warming, acid rain, and noxious smells if released. Existing geothermal electric plants emit an average of 122 kg of CO2 per megawatt-hour (MW·h) of electricity, a small fraction of the emission intensity of conventional fossil fuel plants.[5] Plants that experience high levels of acids and volatile chemicals are usually equipped with emission-control systems to reduce the exhaust. Geothermal plants could theoretically inject these gases back into the earth, as a form of carbon capture and storage. In addition to dissolved gases, hot water from geothermal sources may hold in solution trace amounts of toxic chemicals such as mercury, arsenic, boron, antimony, and salt.[29] These chemicals come out of solution as the water cools, and can cause environmental damage if released. The modern practice of injecting geothermal fluids back into the Earth to stimulate production has the side benefit of reducing this environmental risk. Plant construction can adversely affect land stability. Subsidence has occurred in the Wairakei field in New Zealand.[30] Enhanced geothermal systems can trigger earthquakes as part of hydraulic fracturing. The project in Basel, Switzerland was suspended because more than 10,000 seismic events measuring up to 3.4 on the Richter Scale occurred over the first 6 days of water injection.[31] Geothermal has minimal land and freshwater requirements. Geothermal plants use 3.5 square kilometres per gigawatt of electrical production (not capacity) versus 32 and 12 square kilometres for coal facilities and wind farms respectively.[30] They use 20 litres of freshwater per MW·h versus over 1000 litres per MW·h for nuclear, coal, or oil.[30] Krafla Geothermal Station in northeast Iceland

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