The more traditional waste to energy process creates electricity through combustion but new, more efficient methods involve creating a combustible fuel like methane, methanol or ethanol. Some of the more advanced methods, which often create more electricty from the same amount of waste, include thermal technologies like gasification and non-thermal technologies like anaerobic digestion and fermentation. The waste to energy process typically reduces the volume of waste by 95 percent. As of 2004, there were 89 waste to energy plants in the United States and 413 in Europe in 2005.
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