How to save energy during the holidays

Choose LED holiday lights. They last longer than standard Christmas lights and use 80 to 90 percent less electricity.
Fiber optic decorations are another good option: a single bulb in the base lights up the whole decoration.
Put your lights on a timer, indoors and outdoors. You no longer have to switch them on and off, and they will not stay on all night or during the day, adding to your electricity bill. Check that the timer is rated for the total wattage of the lights connected to it.
When guests come over, lower the thermostat. More people in the house means more free warmth.