... Variations in water level along coastlines can be used to drive turbines technology is the same as low-head hydro power . ... Tidal facility produces about 1/3 the electrical energy of a hydro facility of the same peak capacity . Two tidal plants in the world: . ... Bottom Line: There aren't many favorable sites in the world for tidal power and the estimated capacity is 50 times smaller than the world's hydroelectric power capacity. ... Previous Lecture Next Lecture Course Page ...