The average ComEd residential customer can expect to see a credit of about $14 on October's bill.
The refunds, which amount to about $80 million overall, were approved Wednesday by the Illinois Commerce Commission as part of ComEd's energy efficiency program.
ComEd, an Exelon subsidiary, said it requested the refund as it aims to implement the new Future Energy Jobs Act. The law, which was passed last year, requires ComEd to achieve 21.5 percent annual energy savings by 2030, with incentives for meeting targets and penalties for falling short.
Consumers' monthly energy bills rose an average of $2 in January to help ComEd modernize its infrastructure. The Future Energy Jobs Act authorizes more rate increases, which Exelon has said are limited to 25 cents a month for ComEd residential customers. Opponents of the act have said bills could spike by more than $4 a month.