Biogas consists of about 60-80% methane, 20-40% carbon dioxide and trace amounts of other compounds. It is produced as a by-product from the biological breakdown of organic material such as livestock manure. You can produce biogas in digesters, airtight tank with heating coils. With modifications, water heaters or furnaces can use biogas as fuel because it is able to produce heat and electricity. Digested manure is less odorous and pathogenic than raw manure and therefore better for the environment. The reason that digesters are not used in Alberta is because of their economic feasibility, capital costs can range from hundreds of thousands to over a million dollars. Several biogas facilities have been constructed to test this feasibility again. It will most likely be most feasible for the bigger operations (+1000 pigs).