4.3.2. Heat and steam generation
Producing and selling both heat and steam require the existence of available industrial customers. They should be
matching the supply with their needs. Steam can also be used at institutional domestic complexes.
4.3.3. Transportation fuel
Biogas is used as a transportation fuel in a number of countries. It can be upgraded to natural gas quality for use in
normal vehicles designed to use natural gas [12–15, 17, 20].