| These are conveniently used everywhere for many purpose. | These are not convenient to use everywhere due to some problems. |
| These may be non-renewable sources. | These are renewable sources energy. |
| Its use creates air and water pollution. | Its uses do not create air and water pollution. |
| They are exhaustible. | They are not exhaustible. |
| e.g. burning of coal, wood etc. | e.g. solar energy, tide energy etc. |
Conventional energy source pie diagram