"Gas or gaseous fuel" means natural gas, liquid petroleum gas, or gaseous substances produced synthetically from coal or oil, or derived from the decomposition of organic matter, or derived as a by-product of a manufacturing process, and which can be used to create useful heat or mechanical energy, or a combination thereof.
N.H. Admin. Code § Env-A 1302.20
(See Revision Note at chapter heading for Env-A 1300) #9803, eff 10-31-10