Producers checking their sauerkraut
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Sauerkraut juice powers plant in France

7 February 2013 Last updated at 17:26 GMT

Producers of sauerkraut, or choucroute as it is known in French, have turned to utilizing the fermented cabbage juice to produce bio-gas.

The acidic juice formerly treated as waste due for disposal, now powers a local water treatment plant, with the excess energy sold back into the grid.

Elise Wicker reports.