By combining the energy potential per farm with the number of farms, total energy potential can be determined for both Ontario and Canada.Basedon the data presented, there is thepotential for17,000 TJ of energy annually from Ontario cattle farms which, assuming an electrical efficiency of 35%, is approximately 200 MWe of capacity. Extended to include all Canadian cattle farms, the total energy is 136,000 TJ annually, which is approximately 1500 MWe of capacity.