Wärtsilä has developed the GasReformer, a product which converts associated gas, which is often flared, into usable fuel for its dual-fuel engines. When producing oil, associated gas is also released from the deposits. In many places this gas is commonly burnt off in gas flares, a waste of energy and a pollutant of the atmosphere. In addition to useful methane, this gas consists of heavier hydrocarbons including ethane, propane and butane. The composition of the gas typically also vary during the production phase of the oil field.