Combusting solid biomass is more energy efficient than combusting biofuel (liquids), as the whole plant is utilized. For instance, corn plantations producing solid biomass for combustion generate more than double the amount of power per square metre compared to corn plantations producing for ethanol, when the yield is the same: 10 t/ha generates 0.60 W/m2 and 0.26 W/m2 respectively. Oven dry biomass in general have a calorific content of roughly 18 GJ/t, and every t/ha of dry biomass yield increases a plantation's power production by 0.06 W/m2.