Electricity generated from wood and other waste products was on a roll for a 10-year stretch beginning in 2004. But since 2014, when power production from biomass peaked at 71.7 megawatt hours, expansion has come to an end, the Energy Department reported.
Last year, biomass-fired power plants generated 70.6 megawatt hours, representing about 2 percent of the nation's total electricity generation.
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Biomass includes several types of organic feedstocks that produce heat and electricity including wood chips, wood pulp byproducts, solid waste from landfills and methane-rich gas produced by decomposing organic compounds found at landfills.
Other sources of waste-generated power include fuel made from used tires which is used as boiler fuel at cement kilns and plastics from landfills.