Integrated algae based biodiesel biorefineries. We build state of the art biorefineries that meet the needs of the present without compromising the needs of the future. We use algae as feedstock as it does not compete with food crops. Algae in our biorefineries are fed by nutrients recovered from wastewater treatment plants, exhaust gasses of a power generator, and sunlight. Biodiesel, the main product, produced at our biorefineries is cost competitive with petroleum products.