This document reviews key aspects of biogas production in industrial biogas plants. It discusses the biogas production process, requirements for organic matter, bacteria, anaerobic conditions, and heat. Biogas is a renewable energy source that can be used for electricity production, feeding into gas grids, and as a vehicle fuel. The economics of biogas plants are challenging, as initial investment costs are high and revenues from electricity sales alone often do not cover costs. However, revenues can be increased by utilizing excess heat and selling compost byproducts. While biogas is technically feasible, careful economic analysis is needed to ensure feasibility of individual plants.