My provider keeps screwing me with estimated readings in excess of $400+, when my actual usage has been consistently under $200/mo. Granted they do credit the average when they actually take a real reading, I'm not a loan company and I'm getting frustrated overpaying.
Check with your neighbors. If this is happening to them, too, your electric company is using y'all to earn pennies of interest for free. Call your local news agencies and tell them your electric company keeps consistently overcharging you and give them that "not a loan company" line. Local reporters are incredible at investigating this kind of shit and other people seeing it on tv will encourage them to speak up as well.
I live in a rural area and don't have any nearby neighbors to ask. My wife has said that a lot of people have been complaining about it on Facebook though (locally)
I live in south Texas and there are people with identical issues to yours on the outskirts of my city. I think you should cordially raise a stink about this predatory practice.