What is a Renewable Energy Source

Renewable Energy is derived from various natural processes that are replenished at a rate that is equal or faster than the rate at which they are consumed like
Solar Energy, Wind Energy, Hydro Electric Energy, Geothermal Energy, Biomass Energy, Ocean Energy, Hydrogen Energy
When we talk about renewable energy sources let understand that all sources of energy are derived from nature. Coal and Petroleum are extracted from nature and can be used for creating energy. Crude oil is a naturally occurring, unrefined petroleum product used for energy carriers that can be combined into gasoline, jet fuel, diesel, and heating oils. Coal has to be converted into other forms of energy to use it fully like steam. Coal powered station uses coal to produce steam and the steam is then used to move the turbines that generate electricity. The biggest demand for coal today is from electric power stations.

As of now, the consumption rates of Coal and Crude Oil are such that they will soon be depleted and our dependence on renewable sources of energy will increase by crazy amounts. This means having energy producing technologies and equipment that can convert any form of energy like solar, wind, water etc into viable means of electricity and a form of power supply is and will continue to be extremely important.
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https://www.nrcan.gc.ca/energy/renewable-electricity/7295#solar