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Investigations have been carried out into the feasibility of tapping these reserves, and the volcano is estimated to have a generating potential of 140 megawatts. However, as the area is protected within a national park, drilling has so far been limited to test wells.
This is out of date; I visited Rincón de la Vieja last week and there was one geothermal plant built and functioning, producing approximately 40MW of power, with a second plant in the planning stages. Of course, my word would violate WP:NOR but I am sure experts in this area can find plenty of primary and secondary sources.