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Some energy range for the use of human time is long, wide application, people familiar with them, these energy is called conventional energy, such as coal, oil, natural gas, water, electricity and so on.
Some energy is newly started to use, are increasingly subject to attention, although the total energy currently used in the proportion of very small, but very promising, in the future will be more and more important. So some energy, we call it new energy (i.e., non conventional energy, sometimes referred to as the alternative energy).
Division of conventional energy and new energy is relative. Conventional energy now, once the new energy; new energy, today's &S226; the future will become the conventional energy.