Or you can watch how much you use your lights every day, and get some long-burning candles that are relatively smokeless for when you are sitting around watching TV, listening to music, or just chatting with friends or family.
Biggest energy users are fridge, TV, stereo, and home heating devices. Put on your flannel jammies or a jacket, fix a cup of hot tea (if you live in cold places like I do), and turn off as many lights as possible.
Summer will be here sooner than you think (esp. with global warming proceeding as rapidly as it appears to be doing
)