[Joint]

Replace every single light bulb in your house with a 11 or 18 W compact flouro. That's an energy savings of about 80% for all your lights. Even if you don't grow it's a good idea, and you can find CFLs for $1.50 (and they last longer than regular bulbs too, and pay for themselves quickly). For example, my kitchen and bathroom combined used to use between 600W and 900W (10, 75-100W bulbs, about what a smaller microwave uses), but after replacing them all with CFLs it's down to 100W (9, 11W compact flouros).