Has successfully conducted research on “Variation Of Mass Effect From Coconut Shell Waste Processing For Efficiency Analysis Using Rengginang Cassava Biomass Stove” using the experimental method. The biomass stoves is made with the using biomass energy from coconut shell waste as an energy source or fuel with a variety of mass 960 grams, 1280 grams, and 1600 grams. Observations were carried…