The Illinois Commerce Commission approved an overall $7.05 million electric rate decrease for Ameren Illinois Co., beginning in January 2020.

Typical residential customers would see a drop of approximately $1.13 per month on the delivery portion of their electric bill, according to a company release. The Ameren Corp. subsidiary's lower revenue requirement mainly comes from prudent cost management, operational efficiencies and lesser borrowing costs to fund capital projects.

The commission's order marks the sixth overall delivery rate decrease since the Energy Infrastructure Modernization Act was passed in 2011. The order "provides the resources needed to continue building a cleaner, greener, more resilient grid while keeping customer rates in check," Ameren Illinois Chairman and President Richard Mark said.

The utility provides energy to 1.2 million electric and more than 800,000 natural gas customers in Illinois.