 Norswiss Farms of Rice Lake, Wisconsin, an 1100 cow dairy farm, expects to save over $70,000 per year (plus income from electricity sales) from its installation of an 848 kW Combined Heat and Power (CHP) system operating on anaerobic digesters gas from cow manure.The electricity generated is sold to the grid.A similar installation in 2004 on a 270 cow farm in California (one of five in the state at that time) powered a 75 kW generator.