Stahlbush Island Farms, founded by Bill and Karla Chambers in Corvallis, OR, in 1985, held an open house for its new anaerobic digester biogas plant on Jul 2, 2009. Stahlbush Island Farms is committed to the practice of sustainable agriculture throughout its approximately 5,000 acres of farmland and its processing facility. At Stahlbush Farms, the ensiled material is removed from the bags and fed via the dry material process to the mix tank. The optimum total solids content range for silage is 35% to 40%. Before moving ahead with the anaerobic digestion project, Stahlbush Island Farms contracted with Essential Consulting Oregon LLC in Eugene in August 2007 to perform a technical and financial feasibility study. Stahlbush Farms installed a 1.6 MW Caterpillar CHP unit. The biogas plant is estimated to produce enough electricity for approximately 1,200 homes, nearly twice what the farm and food processing plant uses in a year.