Fossil energy sources that are decreasing and increasing energy needs require alternative energy. Availability of solid waste Palm oil and polyethylene terephthalate (PET) plastic waste are potential sources of energy. The process of heating (thermal treatment) is one method that is deemed appropriate to make palm oil and PET solid waste to have added value and make environmentally friendly waste. This study aims to know the comparison characteristics of drying of biomass materials in the form of shells, fibers, and bunches with PET. The study was mixture of as much as 50:50, heating temperatures up to 105̊C plus the absorber in the form of charcoal. conducted using a microwave oven with 800 Watt power. Automatic temperature and mass recording using data logger and hyper terminal applications. From mixing biomass materials (shells, fibers, and bunches) with PET as much as 50:50, the heating rate was obtained the highest heating heating rate in the bunch test that is equal to 1.3864 ̊C / sec. Bunches heat faster because they have the smallest density value of 0.4710 g / ml. The highest energy consumption is in the process of testing the shell material because the process of testing the shell requires a longer time.