Unplugging appliances is a common way to reduce “phantom” energy use, but testing shows unplugging a microwave after every use saves very little. Most microwaves use only a few watts in standby to power the clock and controls, costing just a small amount per year.
While unplugging can slightly reduce wasted electricity, bigger savings come from reducing the use of high-energy appliances. A microwave’s standby power has only a minor impact on household energy bills.