Geothermal electricity is generated from geothermal energy. Technologies used to convert the geothermal energy to electricity include dry steam power plants, flash steam power plants, binary cycle power plants and lately wellhead generator units. Wellhead units can be connected to wells with output of up to 10-15 MW, with shorter steam lines compared to a central power plant which characteristically have long steam lines. They have modular construction, usually the turbo generator modules are factory assembled on a single sled. As matter of fact, the demand for electric power has been increasing due to economic and industrial growth therefore expanding the demand for small size geothermal power plants