Biogas production from a solid-state digester (SSD) and conventional KVIC plants was compared. The biogas production from the SSD was 84% of that from conventional plants when the maximum and minimum ambient temperatures were 40.2 and 24.9-degrees-C. The relative performance dropped to 60% with a further rise in temperature. Similarly, there was a drastic decrease in gas production as the temperature fell below 15-degrees-C. There was no gas production in the winter months. The solid-state digester could perform well even in winter if the direct effect of temperature on the digester could be avoided by modifying the design by developing an underground anaerobic digestion system equipped with a feeding device for solid waste.