OXNARD, Calif. — Gills Onions here, the nation's largest fresh onion processor, used to pay a lot of money to get rid of onion waste. Now the waste is being used to produce energy. Since last summer, Gills has been mixing the onion waste with bacteria in a special anaerobic digester, producing methane gas. The gas is transferred to two 300-kilowatt fuel cells, from FuelCell Energy, Danbury, Conn., which convert it into electricity used to power Gills' operations and into heat to warm the ...

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