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Nonconventional sources include solar power, wind power, biogas, tidal power, and geothermal power, as well as nuclear power.CONVENTIONAL ENERGY RESOURCES The word 'conventional' is defined as "not unusual or extreme; ordinary."
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A natural source providing us energy continuously is called non - conventional energy resource or a renewable source of energy.
A sources of energy which have accumulated in nature over a very long period and cannot be quickly replaced when exhausted, are called the conventional energy resource or non - renewable source of energy. 
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Example of non - conventional are :- sun, flowing water, wind, ocean thermal
Example of convetional resoures are  :- coal, petroleum, natural gas, 
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