Basically every kind of energy is biological, e.g. coal and oil are
also biological products, but of course this is not the normal meaning
of biological energy.
If you are talking about biological energy normally you mean energy generated
from biomass. Biomass is any kind of organic waste, which can be transformed
in different types of energy.
If you want to know more about biomass and the ways to get energy out
of it click away.
The
advantages of energy generated from biomass
The
methods of getting energy out of biomass