During 1979 a number of important developments occurred at the Cerro Prieto Geothermal Field, Mexico. In April, the total generating capacity at the field reached l5OMWe as the third and fourth 37.5 MW units went on line. Last August, after careful analyses and planning, high temperature brine reinjection was initiated in one of the wells. Also a pilot brine treatment plant for future reinjection tests at low temperature began operation. The new wells in the eastern and southeastern parts of the field confirmed the existence of very hot (>320 C) reservoirs below 2000 m depth.

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