People have harnessed the tides and used its energy for many centuries. Tide mills—which are the precursors to today’s tidal power plants— have great similarity to water wheels. The difference is that water must first be collected from the incoming tide before it can be released to rotate the water wheel.

he oldest, excavated tide mill is dated to the year 619.

Lester Pelton invented a type of free-jet water turbine called the Pelton Wheel or Pelton turbine. Lester Pelton was born in 1829 in Vermillion, Ohio. In 1850, he immigrated to California

Mills using tidal power can be dated back to 12th century Europe,

A huge dam (called a "barrage") is built across a river estuary. When the tide goes in and out, the water flows through tunnels in the dam. The ebb and flow of the tides can be used to turn a turbine, or it can be used to push air through a pipe, which then turns a turbine. Large lock gates, like the ones used on canals, allow ships to pass. If one was built across the Severn Estuary, the tides at Weston-super-Mare would not go out nearly as far - there'd be water to play in for most of the time. But the Severn Estuary carries sewage and other wastes from many places (e.g. Bristol & Gloucester) out to sea. A tidal barrage would mean that this stuff would hang around Weston-super-Mare an awful lot longer! Also, if you're one of the 80,000+ birds that feeds on the exposed mud flats when the tide goes out, then you have a problem, because the tide won't be going out properly any more.

Tidal BarragesA tidal barrage is basically a huge dam that is built across a river or estuary. Tunnels are built throughout the dam, and when the tide rises and falls it turns a turbine that generates power. Tidal FencesTidal fences are giant turnstiles that have vertical axis turbines mounted on a fence. The water passes through the fence and powers the turbines. Tidal TurbinesTidal turbines are the latest water power technology used in tidal areas. They look like wind turbines that are lined together underwater. They are used to capture strong tidal flows, so they have to be built extra strong.

tidal energy uses tidal strength of water and back and forth movement  in seas, rivers or oceans. Tidal power exploits kinetic energy of water that power water turbines with its movement between the wings which rotate the turbine to produce electricity.