ILLINOIS – Ameren Illinois is running a promotion where you can receive a smart thermostat and smart socket for free. Ameren Illinois and Google have partnered to offer Google Nest thermostats to customers at no charge, as long as supplies last. You have until Dec. 31, 2024, to claim this offer. Stephanie Robinson, senior program supervisor with Ameren’s Energy Efficiency program, outlined the energy savings that the smart thermostat can provide.