The predominant energy forms used in livestock facility systems include electricity and liquid propane (LP gas). Using the approximated energy use from USDA data and other sources, electricity and LP gas use will be partitioned into different use categories for swine, dairy and poultry facility systems. LP gas typically is used for space heating and water heating. Electricity is typically used for ventilation, air circulation, lighting, equipment motors and on-farm refrigeration. With an understanding of the partitioned energy use within a given livestock sector, the implementation of energy efficiency practices and standards can be evaluated.