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Pumpkin Power: Turning Food Waste into Energy

November 1, 2013 - 1:28pm

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Pumpkin Power: Turning Food Waste into Energy

To commemorate National Energy Action Month, we’re featuring some scarily effective ways to save energy at home. As cooler weather lurks around the corner, tune in to energy.gov throughout the month of October for ways to save energy and money -- and avoid cold weather terrors like energy vampires. We also put together some energy-themed pumpkin patterns to help “energize” your neighborhood for Halloween. Send us photos of your energy-themed jack-o-lanterns via TwitterInstagramFacebook or email at newmedia@hq.doe.gov and we'll share our favorites during the week of Halloween.

With the passing of Halloween, millions of pounds of pumpkins have turned from seasonal decorations to trash destined for compost heaps or landfills. The story is a little different in Oakland, California. Thanks to the pioneering work of the East Bay Municipal Utility District (EBMUD), discarded pumpkins and other food waste are used as a source of renewable electricity. 

How is that possible? First, waste haulers gather post-consumer food waste and deliver it to EBMUD’s anaerobic digesters. Inside these giant tanks, bacteria break down the food waste and release methane gas as a byproduct. EBMUD captures this gas and uses it to generate electricity in onsite generators. A ton of food waste provides about 367 cubic meters of gas, and digesting 100 tons of food wastes five days a week can generate enough electricity to power 1,000 homes. Once the food waste has been digested, the remaining solids make an excellent natural fertilizer, so they can be used to get next year’s pumpkin crop started.

Discarded pumpkins and other organic waste material can be used for more than just electricity. The Energy Department is working together with industry to develop and test integrated biorefineries, industrial centers capable of efficiently converting plant material into affordable biofuels, biopower and other products. These projects are located around the country and use a variety of materials as feedstocks. 

Two of them, Enerkem in Mississippi and INEOS Bio in Florida, use municipal solid waste as a feedstock, like EBMUD, but use a process called gasification to produce ethanol and electricity. In 2012, INEOS Bio completed construction of the Indian River County Bioenergy Center, which will produce 8 million gallons of ethanol -- enough to fill about 232 of the largest railroad tank cars -- and 6 megawatts of electricity a year from 300 dry tons of biomass a day, including yard waste and food scraps.   

In Mississippi, Enerkem is planning a biorefinery on a regional landfill. They plan to convert 300 tons of solid waste a day into ethanol, amounting to 10 million gallons (290 tank cars) of ethanol per year. 

The Energy Department’s partnership with these companies is helping to remove barriers to commercialization of fuel and power production from municipal solid waste, including yard and food wastes. So it might not be long until the 1.4 billion pounds of pumpkins we produce annually are nearly as important to our energy security as they are to Halloween!

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