Biogas tank at the Sterksel Practice Center. Biogas extracted from pig faeces (slurry) is converted to bio energy at the Sterksel Practice Center (Praktijkcentrum Sterksel) in Sterksel, The Netherlands on 20 October, 2008. Beside their pig dairy farm that runs completely on bio energy, Sterksel Practice Center delivers bio electricity with a capacity for approximately 700 households.  (Photo by Michel de Groot)
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