Los Azufres III Geothermal Power Plant
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Client: Mitsubishi Heavy Industries
Location: Mexico

Mitsubishi Heavy Industries was awarded the EPC contract for the third 50 MW flash geothermal generation unit at Los Azufres, a prolific geothermal resource northwest of Mexico City. The LA III project involves design and construction of a third flash unit at the existing resource, several kilometers from the LA I and II installations. This required development of the entire new plant site including a ring bus substation, installation of the new turbine-generator, separators and piping, extensive NCG extraction systems, and a new wet cooling tower, as well as extensive controls for the generation plant and the steamfield facilities. The new turbine-generator unit is the geothermal debut of a turbine of this size being used in a geothermal flash plant. The axial flow turbine was specified by MHI and CFE, the facility owner, to take optimal advantage of available steam pressure, since the combination of the axial flow turbine with an MHI direct contact condenser delivers the optimal combination of efficient steam flow and low backpressure, maximizing power output. The new plant will feature a multi-cell cooling tower and a hybrid NCG extraction system employing steam ejectors and an array of liquid ring vacuum pumps. POWER’s scope included preparation of specifications, solicitation of bids, vendor selection, and initiation of procurement and expediting of major equipment including NCG equipment, steam dryers, pumps, control valves, cooling towers, and plant instrumentation.