First, cost efficiencies were found for both dairy and swine farms largely due to economies of scale in anaerobic biogas energy production. The cost efficiencies were more dramatic for the swine than for the dairy farm size ranges studied. Second, for both dairy and swine production systems, financial feasibility of anaerobic biogas energy recovery did not change compared to a base scenario (which excluded nonpecuniary cobenefits) when the estimated total annual nonmarket cobenefits of CND$5000 was incorporated into the base analysis. The only exception was when excess electricity generated from a 500-cow farm was assumed to be sold at $0.06 per kWh. However, as expected, values of the three decision criteria improved. Third, improve- ments in the economic feasibility were more dramatic for dairy than for swine farms when higher total annual nonmarket cobenefits (of $10,000 or more) were assessed. Finally, on-farm biogas energy production was generally financially viable for the small-size dairy and swine farms considered when nonmarket cobenefits were valued at $15,000.