Onion juice --> Electricity (Oxnard, CA)

Gills Onions, a California wholesale producer of sliced, diced, slivered and puréed onions, introduced a system this past Friday to turn its 300,000 pounds of daily agricultural waste into valuable energy. Gills' Advanced Energy Recovery System (AERS) takes all that waste and turns it into two kinds of energy: electricity and calories. The juice goes into the anaerobic digester, where microbes turn the juice into methane gas. The gas then goes to fuel cells, which is converted into electricity. Leftover onion waste, mostly pulp, is used as cattle feed. Gills expects to save $700,000 worth of electricity a year, and $400,000 a year in waste disposal costs. Source 1, Source 2