Geothermal energy is thermal energy generated and stored in the Earth. The geothermal energy of the Earth's crust originates from the original formation of the planet. Geothermal is location specific i.e. a resource must exist. Access to the resource is gained by drilling and getting access to steam or hot water. Geothermal is a base-load renewable energy resources.
What are the benefits of using geothermal energy?
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Renewable
Through proper reservoir management, the rate of energy extraction can be balanced with a reservoir's natural heat recharge rate.
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Baseload
Geothermal power plants produce electricity consistently, running 24 hours per day / 7 days per week, regardless of weather conditions.
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Domestic
Geothermal resources can be harnessed for power production without importing fuel.
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Small Footprint
Geothermal power plants are compact; using less land per GWh (404 m2) than coal (3642 m2) wind (1335 m2) or solar PV with center station (3237 m2)
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Clean
Modern closed-loop geothermal power plants emit no greenhouse gasses; life cycle GHG emissions (50 g CO2 eq/kWhe) are four times less than solar PV, and six to 20 times lower than natural gas.
Frequently asked questions
For more information please contact The Renewable Energy Cluster, info@energycluster.is
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Because its source is the almost unlimited amount of heat generated by the Earth's core. Even in geothermal areas dependent on a reservoir of hot water, the volume taken out can be re-injected, making it a sustainable energy source.
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Hydrothermal resources - reservoirs of steam or hot water - are available primarily closed to a body of water and near geologically active zones. However, Earth energy can be tapped almost anywhere with geothermal heat pumps and direct-use applications. Other enormous and world-wide geothermal resources - hot dry rock and magma, for example - are awaiting further technology development.
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The long-term sustainability of geothermal energy production has been demonstrated at the Lardarello field in Italy since 1913 and at the Krafla field in Iceland since 1969. Pressure and production declines have been experienced at some plants, and operators have begun reinjecting water to maintain reservoir pressure.
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Emissions are low. Only excess steam is emitted by geothermal flash plants. No air emissions or liquids are discharged by binary geothermal plants. Salts and dissolved minerals contained in geothermal fluids are usually reinjected with excess water back into the reservoir.
% Usage
Geothermal (heat)
Based on 35.482 TJ
A breakdown of the usage of geothermal energy produced in Iceland. The greatest potential for development is in connection to greenhouses and growing food locally therefore reducing the CO2 and improving quality of selected vegetables & fruits.
Thermal Energy
by Source
Based on 35.482 TJ
Almost all building in Iceland are connected to a district heating system. 97% of thermal energy comes from geothermal sources. The 3% is made with electricity from hydro-power plants. There are around 200 district heating systems in Iceland.