Electricity generated from biomass and waste totaled 70.6 million MWh in 2018, or about 2% of total US electricity generation. Plants are fuelled by a diverse collection of organic feedstocks including wood and wood waste solids, black liquor, municipal solid waste, and landfill gas. These four feedstocks accounted for more than 94% of biomass and waste electricity generation in 2018.
Wood solids were the largest feedstock for biomass and waste electricity generation, accounting for 21.4 million MWh in 2018, or 30% of total biomass and waste electricity generation. Wood solids primarily consist of residues from forestry, lumber production and manufacturing, paper mills, and other allied industries and are used to produce heat and electricity in the electric power and industrial sectors. The decline in wood solids electricity generation since its 2014 peak was highest in non-paper industries (25%) and lowest in the electricity industry (8%).
Black liquor, a byproduct of making wood pulp, accounted for 28% of biomass and waste electricity generation in 2018, second only to wood solids. Black liquor has a high heat content, making it desirable as a boiler fuel, and contributes 56% of total electric generation at papermaking plants. Production of black liquor depends on the papermaking industry’s demand for wood pulp. Although paper production has grown over the past decade, recycled paper replaced wood pulp as the principal feedstock for much of the increase in paper production. As a result, papermaking plants have increased their share of generation from using their own wastes from 66% in 2004 to 75% in 2018.
Municipal solid waste (MSW) contains landfill solids of biogenic and non-biogenic origin, which can be used to produce electricity and heat. Generation from MSW has been fairly stable since 2010, as a result of increased recycling activity that has moderated the growth in available MSW feedstock.
In addition to biogenic waste streams, two non-biogenic wastes are often co-processed with biomass wastes to generate electricity: tire-derived fuel (TDF) from used tires and the non-biogenic portion of MSW. TDF fuel is notable because it has the highest heating value of any solid fuel. TDF is also used as a boiler fuel at cement kilns in addition to being co-possessed with MSW to generate electricity. Plastics comprise most of the combustible non-biogenic portion of MSW and account for 16% of the MSW fuel stream.
Landfill gas (LFG) is a methane-rich gas produced by decomposing organic material at landfills. Electricity generation from LFG more than doubled between 2004 and 2014, growing by 6.3 million MWh. LFG generation growth slowed in 2014, as the percentage of US landfill capacity suitable for LFG facilities approached 65% and after 2014 biogas from landfills qualified for cellulosic biofuel credits under the Renewable Fuel Standard.
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