The Azores Islands consist of nine volcanic islands in the middle of the Atlantic Ocean. Two of them are placed on the American Plate and others are aligned along a northwest southwest tensional axis which runs from the mid-Atlantic ridge to Gibraltar after a directional change close to S. Miguel Island. The youthfulness of the Azores archipelago makes it an attractive target for geothermal exploration and development. Of the discharging wells in operation, the liquid portion, are about 70-80% of the superheated geothermal fluid. Each 10-in. diameter borehole is able to produce 100- 200 tons of fluid per hour