ABSTRACT
The energy in water can be potential energy from a height difference, which is what most people think of in terms of hydro; the most common example is the generation of electricity (hydroelectric) from water stored in dams. However, there is also kinetic energy due to water flow in rivers and ocean currents. Finally, there is energy due to tides, which is due to gravitational attraction of the Moon and the Sun, and energy from waves, which is due to wind. In the final analysis, water energy is just another transformation from solar energy, except for tides.
