ComEd's load profiles are based on average historical hourly load data in kWh, collected from a statistical sample of the segment to be profiled. From the sample data, an average profile for each delivery service class is created for each hour in the year. The sample data used to compute these averages are also utilized in the PJM 60-day reconciliation process.
The link below contains historical hourly load data from April 1, 2009 CST and is updated on a monthly basis. The data are in an excel format.
Historical Load Profiles (xls)