Home ResidentialWhether you own or rent your home, explore ways to save money and improve the comfort of your home. Start Saving BusinessNo matter the size of your business, there are energy-saving opportunities to save money and time. Start Saving MultifamilyIncrease the value of your building, lower operating costs and improve tenant comfort by making your property more energy-efficient. Start Saving Income QualifiedEnergy-saving opportunities for eligible residential customers. Start Saving Residential Business Multifamily Eligible Customers Discover Google Nest Thermostats and SaveNow until Dec. 31, 2022, get a $0* Google Nest Thermostat, tax and shipping included, courtesy of the partnership between Google and Ameren Illinois. Learn MorePower Supply IncreaseWe've seen a global increase in the price of energy to heat, cool and power homes and businesses. Ameren Illinois delivers this energy, dollar for dollar, with no mark-up in price for our customers.View Saving OptionsMarket Development InitiativeThe mission of MDI is not only to meet key metrics, but to transform how the Energy Efficiency Program operates in every area. To this point, MDI cultivates new economic and energy efficiency opportunities for diverse individuals and communities residing in the Ameren Illinois service territory.Learn MoreStart saving money today with a Home Energy AssessmentThrough this service, we can provide eligible customers with information about saving energy in your home, possibly at no cost!Get Started Now!Online MarketplaceAmeren Illinois brings special offers on a variety of energy-efficient products.Explore TodayShop the Business Online StoreGet instant savings on smart thermostats, smart LEDs, advanced power strips and more.Click HereRun a Small Business?No matter the size or budget of your business, there are low- and no-cost energy-saving solutions to help you save money.Learn More Previous Next 2021 HIGHLIGHTS 0 Smart thermostats were installed in Ameren Illinois customer homes $ 0 Energy cost savings for our customers 0 Small Business energy efficiency projects 0 Customers engaged through the Market Development Initiative How We Help Since 2008, the Ameren Illinois Energy Efficiency Program has been helping our state transition into a more affordable and cleaner future. We don’t just work in your community, we’re a part of it. We work with residents, businesses and partners across Illinois to save our customers money, lower carbon emissions and strengthen our state’s economy. We are committed to helping you improve comfort, manage usage and reduce costs. Learn More