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Geothermal power is considered to be sustainable because the heat extraction is small compared to the Earth’s heat content, but extraction must still be monitored to avoid local depletion. Although geothermal sites are capable of providing heat for many decades, individual wells may cool down or run out of water.

The three oldest sites, at Larderello, Wairakei, and the Geysers have all reduced production from their peaks. It is not clear whether these plants extracted energy faster than it was replenished from greater depths, or whether the aquifers supplying them are being depleted. If production is reduced, and water is reinjected, these wells could theoretically recover their full potential.

Dry steam power plants

Dry steam plants are the simplest and oldest design. They directly use geothermal steam of 150°C or more to turn turbines.

Flash steam power plants

Flash steam plants pull deep, high-pressure hot water into lower-pressure tanks and use the resulting flashed steam to drive turbines. They require fluid temperatures of at least 180°C, usually more. This is the most common type of plant in operation today.

Title:Geothermal Electricity
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Geothermal Electricity

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