Xcel Energy Always over charging during December-March Texas

Every single year without question Xcel Energy charges me more than what I actually used December January February and March every year without a doubt. We have called and they said we are on the average plan we took ourselves off the average plan 2 years ago. April through November my electric bill is between 112 and 140 maybe 160 on certain occasions. As soon as December through March hit my bill is way over $200. I do nothing different my kids go to school my husband works I stay home there's one TV on one light on and the air is always going. Never changed my routine and yet they still do it. It's become ridiculous and it's impossible to fight and Xcel is our only provider. I'm getting sick of their outrageous charges and their lack of answers if you can choose any other company do not go to Xcel it's not worth it. And the deposit must be made within three months otherwise it's on your next bill they did that to me during Christmas. Because the holidays, my payment was two days late, they wanted me to pay almost 800 in three days or cut off. Luckily I had an awesome landlord, and he called them and told the company I moved so we could put it in my husband's name.