Five most renewable and efficient sources of energy, can be enlisted as;

1. Solar energy- The main use of solar energy can be understood from the factor where the amount of solar energy reaches the earth's surface.

2. Wind Energy- This can simply be called energy coming from wind or the use of windmills, also it is one of the cleanest forms of energy.

3. Hydro Energy- The energy coming from water or dams. Dams have proved to be both effective as well as disastrous too.

4. Tidal energy - It is generated with the help of tidal currents twice and it will also help to generate and drive turbine generators at a rapid pace.

5. Geothermal - Geothermal Energy can be derived from the help of the natural heat that comes out from below the surface of the earth.

So it is in this way the solar power plants in Kolkata can be quite effective and play a strong role besides these sources of energy.

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