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Disadvantages of Geothermal Energy
Emissions of greenhouse gases present below earth surface can migrate above the earth surface which increases the pollution levels. This situation mostly prevails around geothermal power plants.
Construction of geothermal power plants may affect the stability of the land.
It is costly to setup the geothermal power plants.
Heat up-front costs to set up heating and cooling systems.
Setting up of geothermal reservoirs is location specific since it has specific needs. Such locations are mostly far from the populated area.
To function geothermal heat pump, input power is needed which leads to the consumption of more energy.
Transportation of geothermal energy for long distances is costly and prohibitive.
The thermal efficiency of geothermal electric plants is low and is around 10-23%.
Fluids drawn from deep under the earth contain a mixture of gases like carbon dioxide, hydrogen sulphide, methane and ammonia which contribute global warming and cause irritating odour.
Hot water obtained during geothermal sources contains traces of mercury, arsenic, antimony, boron etc. which are toxic chemicals.
The enhanced geothermal system can trigger earthquakes as a part of hydraulic fracturing.
It may release some harmful, poisonous gases that can escape through the holes drilled during construction.