Startup Idea : Biogas production and its use on small scale

We have bio gas produced on large scale and its purification but due to high cost of production and large amount of initial investment needed these projects are not successful on large basis. If we can use the biomass generated from a society to produce purified bio gas which can be used for electricity generation.This electricity will be supplied to same premises.Thus solving the cost of electricity backup and reducing the dependency on the supply of electricity from major power grids of the city. Lets build and solve the problem of society by reducing the dependency on fossil fuels.