Derived from renewable materials
Eg. Ethanol and Biodiesel
From fermentation of crops
Grown as a cash crop
Too volatile to use pure ethanol
Up to 15% used in a mixture
From trans-esterification of oils or fats
Made from waste oil
Used pure or as a mixture
Biodegradable
Less pollutants released
Apart from Nitrogen Oxides
\[2H_2+O_2\Rightarrow 2H_2O\]
Renewable
Transportable by pipeline
Used directly in engine or as a fuel cell
No poluutants
From electrolysis
Uses alot of electricity
Low energy density in comparison to other fuels