Performance of the Janata and Deenbandhu fixed dome biogas plants for annerobic digestion of dairy manure was evaluated under the conditions of a hilly region. In contrast to Janata, the Deenbandhu biogas plant was found to be not only cheaper on the basis of cost/m(3) rated capacity of the plant, but it also produced more gas per unit of manure fed and per unit of digester volume in addition to maintaining a consistent rate of gas production during subsequent years from initial charging The higher production of gas by 28.5% and 12.5% per kg of manure fed and 49.5% and 28.9% per m(3) of digester volume was observed fi om this plant for highest 24 degrees C and lowest 14 degrees C digester temperatures of the plants for the months of July and December respectively.