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From 1995 to 1999, the geothermal investigations have concentrated mainly in the area of Laguna Colorada, carrying out studies based on tbe potential of the field Sol de Manana.

The drilling of geothermal wells (6), carried out from 1987 to 1992, has permitted us to confirm the existence of reservoirs of high enthalpy in the field Sol de Manana.

The conceptual model of the reservoir was based on the existing geophysical, geological, petrographic and drilling information, determined rnainly by structural and lithological aspects of the field. The reservoir of commercial interest has a thickness of 900 m but could be thicker due to the fact that it has not been possible to find the lower limits of the reservoir in the already perforated wells.

The interpretation of the profiles of pressure-temperature in static conditions shows that the reservoir is liquid-phase. During flow, a change in the phase of the fluid occurs in the casing of the well at an approximate depth of 1000 m.

The average production of the wells is 350 t/h of geothermal fluid, with an enthalpy of 1070 KJ/kg from an approximate reservoir temperature of 260