They want people to save energy during the hot months ahead. One of the big power suckers is air conditioning.
Ameren is offering a range of rebates to help people save energy and money including a $25 rebate on programmable air conditioning.
They said that people leave the air on all day so it's not hot when they get home, but that adds up on the electric bill and puts more coal and gas into the environment.
Rebecca Devens is a policy analyst for CUB and said that making small changes will keep your bills from skyrocketing, even when temperatures do.
"It's the coffee maker that we don't turn off, the light bulbs we leave on and the programmable thermostat that we neglect to program," Devens said.
Ameren is also helping people get rid of inefficient appliances. They will pick up any old refrigerators and freezers and recycle them. And pay residents $50 to do it.