No built-in General Electric microwave oven models are certified as energy efficient by the Department of Energy's Energy Star program. Energy Star currently does not certify microwave ovens from any manufacturer as efficient appliances.
Microwave oven energy consumption does not vary considerably between different manufacturers. In addition, built-in microwave models are not significantly more or less efficient than countertop or over-the-range models. However, microwaves can consume 80 percent less energy than gas or electric ovens. Consumers seeking the most efficient built-in General Electric microwave oven are advised to select a model with a power consumption of 800 watts or less, such as the GE Profile Series PEM31DFBB.