As some folks use a lot more electricity than others, the only options is to charge everyone extra for an average usage, or to charge per amount of use. Depends on what is best for you. In areas that need lots of AC, and have high energy prices, per user might be better. In lower energy prices and more moderate usage, an average might work better. If you have a stick house, you pay for your use per your house, yet nobody wants to pay the same as your neighbors if you are not at home and they are. In RV parks, some folks go out and work or play all day, others stay at the park and enjoy AC or heat.