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For example, coal is a non - renewable source of energy because coal has accumulated in the earth over a very ,very long time, and if all the coal getys exhausted ,it cannot be produced quickly in nature.Non renewable sources of energy are dug out from the earth.

Those sources of energy which are being produced continously in nature and are inexhaustible ,are called  renewable sources of energy.For example,wood is a renewable source of energy because if trees are cut from the forests for obtaining wood,then more trees will grow in the forests in due course of time.So, the loss of wood by cutting trees is made good by nature.The renewable sources of energy are called non - conventional sources of energy.These sources of energy can be used again and again ,endlessly.They will never get exhausted.Since renewable sources of energy will never get exhausted,so they are also known as inexhaustible sources of energy.A yet another name for renewable sources of energy is the alternative sources of energy.