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April 26, 2013
The Environmental and Energy Study Institute (EESI) held a briefing on the benefits of capturing and harnessing methane emissions from municipal solid waste landfills. Landfills are the third largest source of anthropogenic methane gas produced in the United States; between 1990 and 2011, landfill gas (LFG) composed 17.7 percent of all U.S. methane emissions. Because of the high methane content in LFG, the captured gas can be refined and used to produce heat, electricity, and/or vehicle fuels. More than 590 landfill projects in 47 states capture enough LFG to power more than one million homes and heat 740,000. The U.S. Environmental Protection Agency (EPA) estimates that there are more than 500 additional landfills that are candidates for LFG energy projects. The briefing discussed the economic, health, and climate benefits of tapping the energy potential of the nation’s landfills.
Currently, all U.S. landfills larger than 2.5 million metric tons (or cubic meters) of waste are required to combust landfill gas. While many landfills continue to flare LFG, local governments and private waste managers are increasingly opting to convert LFG to electricity, thermal energy, and vehicle fuels. EPA assists landfill owners and operators to develop and implement LFG projects through its voluntary Landfill Methane Outreach Program (LMOP).
Miramar Landfill, San Diego’s only active landfill, is an LMOP partner. The 42 million ton facility generates 9.6 MW of power for the city. An additional 3.2 MW of capacity was installed in 2012 for use at the nearby Marine Corps Air Station Miramar, meeting up to 50 percent of the base’s electricity needs while improving its energy security. The project also provides a nine percent return on investment over 15 years.