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Flash process (geothermal)


Technology Description

Flash steam plants, making up about two-thirds of geothermal installed capacity today, are used where water-dominated reservoirs have temperatures above 180°C. In these high-temperature reservoirs, the liquid water component boils, or “flashes,” as pressure drops. Separated steam is piped to a turbine to generate electricity and the remaining hot water may be flashed again twice (double flash plant) or three times (triple flash) at progressively lower pressures and temperatures, to obtain more steam.

Relevance for Net Zero

Mature technology, but deployment opportunities depend on local potential.

Key Countries

Nicaragua, Costa Rica, El Salvador, Iceland, Türkiye, Kenya, Japan, New Zealand, Mexico, Indonesia, United States, Philippines

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