Ormat ORC: Ormat geothermal power stations work all over the world with more than 950 MWe capacities, that means many million hours of operation experience. An Organic Rankine Cycle is a thermodynamic process where heat is added to a special kind of organic fluid at a constant pressure, the fluid is vaporized and then expanded in a vapour turbine, which drives a generator, producing electricity. The spent vapour flows to a condenser where it is condensed to liquid and recycled back.

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At higher temperatures the cycle could be further improved in order to achieve higher efficiency.

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With good steam based reservoirs the best avaialble option is the Combined Cycle Power plant.

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