When heating or boiling small amounts of water use an electric kettle. It heats water more efficiently than either stove elements or microwave ovens. For maximum efficiency the kettle should have an automatic shut-off switch. Broiled meats cook faster, saving energy. Oven cooking is more economical than cooking on the stove top surface.
Ovens require energy only periodically since the insulation holds in the heat.
Most cook tops consume energy the entire time they are in operation. Cook outdoors or prepare cold meals to avoid excess heat in the kitchen. Use a microwave or small appliances, such as a toaster oven or electric frying pan whenever possible. They are more energy efficient than conventional ovens and use about half of the electricity of a full-size oven. Preheat your oven only when necessary, usually only when leavening is used such as in cakes or breads.