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Geothermal power is utilising energy that comes in the form of heat from beneath the earth’s crust- surface layer.
Geothermal power is a renewable heat source that can provide energy for electricity production as well as heating for a number of applications and appliances.
Utilising geothermal power requires accessing high temperature fluid that is heated deep underground.
The water is heated by hot rock underneath and compressed by pressure that maintain it its liquid form.
The water potentially then finds a path through the Earth’s crust, and presents itself on the surface as hot water springs or geysers.
Dry steam geothermal power plants use geothermal steam directly to turn the electricity producing turbines.
The pressure of hot steam is driven through pipe shafts, which then rotate the turbines.
Hot steam is then cooled in a cold heat exchanger and the cold water is then pumped back into the ground, which then kicks off this cycle again.
Flash steam geothermal power plants rely on highly pressurised, superheated water instead of steam.
The highly pressurised liquid is pushed through a series of pressure tanks. In turn, these holding tanks reduce the pressure of the liquid, allowing it to turn into steam.
This process is repeated several times in different depressurised chambers with the steam then collected and flashed through to drive a turbine generator system to create electricity.
Binary cycle geothermal power plants use lower temperatures to produce energy.
Used the heat gradient to turn a working fluid, such as ammonium or propane into steam to drive the electro generating system.
This type of system can be implemented using lower ground temperature as a working fluid has a lower boiling point than water.
Once the working fluid passes through the turbine shafts, it is condensed back into the liquid and reused over and over again.
Geothermal power electricity is currently produced in 24 countries across the planet with the total combined installed capacity being approximately 10,715MW.
Geothermal power as a heating solution is much more widespread, and currently used in over 70 countries worldwide.