National Energy Board Act Part VI (Oil and Gas) Regulations (SOR/96-244)

10.1 For the purposes of subsection 119.01(1.1) of the Act, natural gas means a mixture of gas that is composed of at least 85% methane and that may also contain other hydrocarbons that at a temperature of 15°C and an absolute pressure of 101.325 kPa are in a gaseous state, as well as minor amounts of non-hydrocarbon gas and impurities.