Pursuant to the Commission's order in Docket Number
each electric utility is required to file a monthly report showing the supply options chosen by the utility's customers.
The reports show the number of customers, and associated electricity usage, receiving hourly supply service, fixed price
supply service from the utility or supply service from a Retail Electric Supplier (RES). Beginning with the June 2010 reports,
the reports from Ameren Illinois provide more granular data for the non-residential customer classes.
Staff will add the more granular data to reports issued prior to June 2010 over the coming months. As of October 2010, Ameren CIPS
is now Ameren Rate Zone I, AmerenCILCO is now Ameren Rate Zone II, and AmerenIP is now Ameren Rate Zone III. Additional information relevant to the competitive retail
electricity market can be found on the website of the Office of Retail Market Development (ORMD).