A source of energy is one which can provide appropriate amount of energy in expedient form over a long period of time.
Two main categories of the source of energy are:
a) Renewable source of energy-source of energy that is not depleted when used. Such as wind or solar power.
b) Non- renewable source of energy-sources of energy that will run out or will not be replenished in our lifetimes or even in many, many lifetimes.
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