Renew Energy provides biogas plants that utilize residual products from traditional distillation plants, 1st generation bioethanol plants, and 2nd generation bioethanol plants. Thus, use of fossil fuels can be avoided and energy be produced in the form of electrical power, steam and heat which can be used for the operation of the plant. Energy surplus can be sold.
Water, ammonium, nutrients, and other refined residual products can be reused and sold as fertilizer products.
Read more about Renew Energy's biogas plant in combination with ethanol plants here.