On-Bill Financing is offered as a way of funding energy efficiency projects a Residential customer may wish to complete for their home. For customers and energy efficiency projects that qualify for On-Bill Financing, Ameren Illinois will pay the out-of-pocket cost upfront, then the customer will utilize On-Bill Financing to repay the loan, with interest, by submitting regular payments through their existing Ameren Illinois energy bill. The interest rate for Residential On-Bill Financing loans is currently at 8.74%.