Guide to Geothermal Energy and the Environment Geothermal plants

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Guide to Geothermal Energy and the Environment Geothermal plants ( guide-geothermal-energy-and-environment-geothermal-plants )

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Figure 17: Carbon Dioxide Comparison 2500 2000 1500 1000 500 0 Coal, oil, and geothermal reported as average existing power plant emissions; natural gas reported as average existing steam cycle, simple gas turbine, and combined cycle power plant emissions. Mercury The majority of mercury emissions derive from natural sources.73 Mercury occurs naturally in soils, groundwater, and streams, but human activity can release additional mercury into the air, water, and soil. Coal-fired power plants are the largest source of additional mercury of any energy source, because the mercury naturally contained in coal is released during combustion. Currently, the coal industry contributes 32.7 percent of the nationís anthropogenic mercury emissions.74 Mercury emissions from coal vary both day to day and from plant to plant. According to a recent EPRI study, mercury emissions vary significantly over a one month period. Snapshot mercury emissions information, taken over a 1-2 hour period, does not always accurately reflect long term mercury emissionsóhourly averages can vary by almost an order of magnitude.75 In addition, mercury emissions from certain types of coal plants, 73 Feeley, Thomas J., et al. (April 2003). U.S.DOE/National Energy Technology Laboratory[NETL] Hg R&D Program Review. A Review of DOE/NETLís Mercury Control Technology R&D Program for Coal- Fired Power Plants. Retrieved November 3, 2004, from http://www.fossil.energy.gov/programs/powersystems/pollutioncontrols/mercurycontrols_whitepaper.pdf 74 U.S. EPA Mercury Study Report to Congress (Dec 1997). Retrieved September 30, 2004, from http://www.epa.gov/oar/mercury.html. 75 Chu, Paul, et al. Longer-Term Mercury Emissions Variability. U.S. DOE. Retrieved November 8, 2004, from http://www.netl.doe.gov/coal/E&WR/mercury/pubs/A3-3.pdf. Coal 2191 Oil 1672 Natural Gas Geothermal (flash) Geothermal (binary) lbs/MWh 1212 60 0 34

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