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Choice of a proper power plant design is based on a number of factors, with resource temperature being one of the most important considerations.  In general, low to moderate temperature resources, those generally above boiling up to temperatures near where the steam fraction becomes significant, must utilize a binary plant design.  Under these conditions, the hot brine is pumped from the wellfield to the plant where its heat is transferred to a low boiling point "working" fluid that vaporizes and expands to drive the turbine and generate electricity.  The working fluid vapor is then condensed within the binary closed-loop system for reuse, while the brine exits the plant for injection back into the geothermal reservoir.

Binary - Water Cooled