Renewable energy can be used to
decrease global dependence on natural resources, and
tidal power can be the primary form of renewable power
utilized. Built upon steam turbine knowledge, tidal
turbines draw on innovative technology and design to
operate on both the inflow and outflow of water through
them. Tidal power utilizes twice the daily variation in sea
level caused primarily by the gravitational effect of the
Moon and, to a lesser extent by the Sun on the world's
oceans. The Earth's rotation is also a factor in the
production of tides