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Hydel energy Energy from water sources
The energy in the flowing water can be used to produce electricity. Waves result from the interaction of the wind with the surface of the sea and represent a transfer of energy from the wind to the sea. Energy can be extracted from tides by creating a reservoir or basin behind a barrage and then passing tidal waters through turbines in the barrage to generate electricity. Mini or Micro Hydro power
In fact, for the last few hundred years, people living in the hills of the Himalayas have been using water mills, or chakki, to grind wheat. The 130 KW small hydropower plant in Darjeeling set up in 1897, was the first in India. Besides being free from the problem of pollution, such plants are also free from issues and controversies that are associated with the bigger projects, namely affecting the lives of thousands of people living along the banks of the rivers, destruction of large areas under forest, and seismological threats. New environmental laws affected by the danger of global warming have made energy from small hydropower plants more relevant. These small hydropower plants can serve the energy needs of remote rural areas independently. The real challenge in a remote area lies in successful marketing of the energy and recovering the dues. Local industries should be encouraged to use this electricity for sustainable development. It is a technology with enormous potential, which could exploit the water resources to supply energy to remote rural areas with little access to conventional energy sources. It also eliminates most of the negative environmental effects associated with large hydro projects. Energy from the sea - Ocean thermal, tidal and wave energy
Energy is also obtained from waves and tides. The first wave energy, project with a capacity of 150MW, has been set up at Vizhinjam near Trivandrum. A major tidal wave power project costing of Rs.5000 crores, is proposed to be set up in the Hanthal Creek in the Gulf of Kutch in Gujarat. In some countries such as Japan small scale power generators run by energy from waves or the ocean, have been used as power sources for channel marking buoys.
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On an average, the 60 million sq km of tropical seas
absorb solar radiation equal to the heat content of 245 billion barrels of oil. 
Hydro power
is one of the best, cheapest, and cleanest source of energy, although, with big dams,
there are many environmental and social problems as has been seen in the case of the Tehri
and the Narmada Projects. Small dams are, however, free from these problems. This is in
fact one of the earliest known renewable energy sources, in the country (since the
beginning of the 20th century). 
Large amounts
of solar energy is stored in the oceans and seas. On an average, the 60 million square
kilometre of the tropical seas absorb solar radiation equivalent to the heat content of
245 billion barrels of oil. Scientists feel that if this energy can be tapped a large
source of energy will be available to the tropical countries and to other countries as
well. The process of harnessing this energy is called OTEC (ocean thermal energy
conversion). It uses the temperature differences between the surface of the ocean and the
depths of about 1000m to operate a heat engine, which produces electric power. 