Help contribute to a smarter energy future, keep costs down for your community, and benefit the environment! Plus, you'll earn a sign-up bonus of $50 and receive $25 each year! All you need is a qualifying smart thermostat, and you'll see that our Peak Time Savings Program may be right for you. To see how the program can benefit you, select the thermostat that you have or are interested in learning about below. Don't have one? Visit the Ameren Missouri Online Store to purchase a qualifying thermostat.