Become a Business & Residential Program Ally Contractor Let’s Work Together. When Ameren Illinois residential and business customers seek equipment installs, repairs or services, they turn to our trusted Program Ally Contractors. As a registered Residential or Business Program Ally, you’ll gain access to free technical training, project support, marketing support, and more! In addition, you will be able to offer energy efficiency incentives to your customers. All members of a project team are welcome, including: architects, engineers, general contractors, electrical contractors, HVAC contractors, mechanical contractors, manufacturers, vendors, suppliers, and BPI certified insulation specialists.