Because of the fact that gasoline is an non- renewable recourse, some people are using bio-diesel instead. It's important to know how to make bio-diesel so that when we are out of gasoline we have something that can be used to generate power in cities. Hence bio-diesel power plants instead of coal power plants. But, because solar power is much more efficient. I would use that instead.
The objective of biogas production is to utilize cost free sources of energy. It is also important in the control of over biogenic waste material, thus helping reduce damages that are caused by unprofessional biogenic waste management.