If you owe for past due service, you may have the opportunity to make an arrangement with Ameren Illinois and avoid disconnection of your utility service. Our online payment assistance tool provides eligible payment assistance options based on your account status. If you are a residential customer, you may be allowed to make fixed monthly payments along with the regular bill in order to pay off the past due balance. A payment may be required to activate a payment agreement. If you only need a few extra days, contact us for a short term extension.