Never use an oven to heat the kitchen or dry clothing. It wastes energy and can be hazardous. Check the wattages of the incandescent light bulbs in your house. In many cases, you can substitute lower wattage bulbs and get more light for the same amount of energy. Look for the lumens of a bulb instead of watts.
Lumens indicate the brightness of the bulb.
Watts only tell you the amount of power it takes to make the bulb work. They give less light than standard incandescent bulbs of the same wattage. Urge everyone to turn off lights when leaving a room. Having wall switches in convenient places helps everyone remember. Select lighting fixtures on the basis of their efficiency.