About Ameren Illinois Ameren Illinois provides electric transmission and distribution service and natural gas distribution service. Every day, we deliver electricity to 1.2 million electric and 816,000 natural gas customers in central and southern Illinois. We deliver safe, reliable energy to more than 1,200 communities. Our benefits include: Medical coverage on date of hire100% employer paid cash balance pension plan401(k) with company match fully vested on date of hireMinimum of 15 days paid