This three-section report provides introductory information about biogas production and its application to farm environments. The first section discusses the various components of a biogas production system (a system that converts organic wastes into a usable form of energy), explains the system's benefits and liabilities, and provides a brief checklist to determine if biogas production may be applicable to a specific situation. The second section features descriptions of four biogas projects using a case study approach. These projects were completed with federal funds awarded to farmers, ranchers, and engineers to design, construct, and demonstrate biogas production systems. The third and final section provides descriptions of several Department of Energy grants relating to biogas production and an annotated list of suggested readings. (ML)