NaturalGas is mostly Methane, with some other components as well. Although NaturalGas is a FossilFuel, Methane can be produced in many other ways as a BioFuel, for example, from a BioFuelGenerator. There is already a hugh infrastructure supporting the usage of of NaturalGas. In time, with a greater production of Renewable Methane, this infrastructure may become an important component of the RenewableEnergy system.