Ecuador is located on the active convergent plate margin of Southamerica, which is characterized by a broad continental volcanic arc with abundant active volcanoes and intense seismicity. Earlier geothermal exploration, carried out from the mid 1970’s to the earlier 1990’s by government institutions with the aid of foreign technical assistance programs, defined a combined theoretical potential of about 500 MWe for the three most promising geothermal prospects, namely: Tufiño-Chiles, Chalupas and Chachimbiro, located in the highlands of central-north Ecuador. A dozen of other geothermal prospects, related to silicic calderas, or to evolved stratovolcanoes, or even to evolved basaltic shields, like Alcedo in Galapagos, will substantially incr...