Renewable source of energy means that this source is not exhaustible by its use in producing electricity or heat (steam) or mechanical energy.
An example is solar energy. Using sunlight to produce electricity through special devices, called photoelectric cells, will not exhaust sunlight coming to earth.
Fossil fuels like oil, gas, and coal are examples of nonrenewable sources of energy as they are exhausted by their use.
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Renewable source of energy creates little or no pollution compared to burning of fossil fuels.Solar energy is widely used renewable source of energy.Hydroelectric energy and wing energy is also used as a renewable sources of energy.
Chemical energy is both renewable and non-renewable in different situations. When burning fossile fuel, it is non-renewable. But it is renewable with flowers as long as their source remains available. So if the chemical the energy is being produced from is renewable, then the chemical energy will be too.
It takes millions of years to have more of. That's what makes it non-renewable.
It provides renewable energy for human populations
Geothermal is considered a renewable resource as it uses water and the earth's heat. Both of these are inexhaustible. However, if the water near the plant is exhausted (no more water in that area, but there is no less water than before), then the plant must be moved. It is still generally considered a renewable source of energy.