35.21 — Manufacture of Gas

This class includes: - production of gaseous fuels for energy supply through a gas distribution network (e.g. by carbonation of coal, gasification of lignite, electrolysis or methanisation) - production of gaseous fuels for energy supply with a specified calorific value, by purification, blending and other processes from gases of various types, including natural gas or hydrogen - production of biogas for the purpose of gas supply (e.g. from sewage sludge, manure, waste) - production of gaseous biofuels for energy supply through a gas distribution network

This class also includes: - cleansing of biogas for energy supply through a permanent network - regasification of natural gas for distribution through mains

This class excludes: - extraction of crude natural gas, see 06.20 - production of coke oven gas, see 19.10 - manufacture of refined petroleum products, see 19.20 - production of liquefied petroleum gas (LPG), see 19.20 - manufacture of industrial gases, see 20.11 - production of hydrogen, not for energy supply through a network, see 20.11 - manufacture of basic organic gases, not for energy supply through a network, see 20.14 - production of blast furnace gas, see 24.10