Geothermal Power Plant. The Cerro Prieto Geotherminal field covers an area of approx. 15km2, the first power unit was commissioned in 1973, presently there are 13 power units in operation with a total capacity of 720mw. The geothermal field has 120 km of steam pipe and 60 km of channels to channel brine. Baja California, Mexico. © March 5 2008 Marco van Middelkoop/Aerophoto-Schiphol..