Optimize Outdoor Lighting
 No surprises here: the more efficient your outdoor lights and the less you use them, the less energy you will waste. There are some neat-o products out there to help you on both points.
Outside, put a motion- or light-sensing control on the lights to turn them on only when you need them.
For floodlights, high-pressure sodium lights are the most energy-efficient. Halogen lights are the least efficient, so if you don't like the sodium lights, try cold-start compact fluorescent or metal halide lights.
There are some nifty solar-powered lights you can buy that soak up sunlight during the day and cast a gentle glow on your patio or the pathway to your door at night. No buried cables, no extension cords.
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