Select flat-bottomed pans that fit your heating units. Use lids to retain heat and decrease cooking time. Once water or other liquids reach a state of boiling, they won't get any hotter. You can turn the burner down. Use your oven rather than the range whenever you can.
Insulated ovens retain heat and use less energy.
In the oven Baking defrosted food uses one-third less energy than starting with frozen food. You don't need to pre-heat your oven if your dish requires an hour or more to cook. When using the oven, prepare a complete oven meal or several baked goods to cook at the same time. Look through the window or use a cooking timer. Never line the oven with aluminum foil because this could reduce hot air flow, lower the interior temperature and block a vent.