Remove or reduce unnecessary lighting
Lighting accounts for 1/5 of home electricity use. If an area is overlit, that electricity is being wasted. Don’t reduce light levels beyond what is comfortable.
If a fixture holds a few bulbs, maybe you can just remove one or two. Otherwise, use lower wattage bulbs. For example, replace a 23 W compact fluorescent with a 13 W. Also, a cool white or daylight bulb appears brighter, so if you like the look of cool white or daylight for a given room, try one of those.