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Geothermal technology extracts the heat found within the subsurface of the earth, which can be used directly for heating and cooling, or converted into electricity. However, to generate electricity, medium- or high-temperature resources are needed. These are usually located close to tectonically act…

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Geothermal energy may be most efficient in areas with high underground temperatures - "hot spots" with active or geologically young volcanoes. For example, the Pacific Rim or the Ring of Fire, located along Alaska, California, and Oregon, has many hot spots. The United States has the largest installed geothermal capacity in the world. Nevada holds the majority of the country's geothermal capacity and is continuing to develop new projects.

Geothermal power potential varies across the world based on the seismic activity that occurs under the earth's surface and its geology. Regions with milder heat can be also be used, primarily for direct heating purposes. This heat energy is normally extracted from shallower depths. Dry rock formations between four to ten kilometers below the surface can also provide vast amounts of heat energy. There are various technologies that have been developed to extract geothermal energy.

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Geothermal energy may be most efficient in areas with high underground temperatures - "hot spots" with active or geologically young volcanoes. For example, the Pacific Rim or the Ring of Fire, located along Alaska, California, and Oregon, has many hot spots. The United States has the largest installed geothermal capacity in the world.

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Geothermal energy is a popular source of electricity in countries like Iceland, El Salvador, New Zealand, Kenya, and the Philippines. Iceland also uses it for heating.

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Geothermal energy is used for heating systems and electricity.

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Cool water is pumped in to the earth's surface and converted to steam to become geothermal energy.

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Geothermal energy is heat derived within the sub-surface of the earth.