A power generation system comprises heating water using geothermal energy in an underground formation, the water being forced to the surface of the ground by convection through looped pipe work where it is used to drive micro-turbines which drive generators to produce electricity. The water is cooled by the air above ground which allows the water to continue circulation back underground. The water may also be cooled by a heat exchanger. The looped pipe work may be open or closed, and may be horizontally or vertically arranged. The convection process may be naturally occurring or induced. The electricity produced may be used in any building or fed directly into the national grid.
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