These data items are provided by ComEd for informational purposes only. ComEd has compiled the data in good faith from sources believed by ComEd to be reliable but does not warrant the accuracy of the data. Further, there is no representation that these data are indicative of future outcomes. By use of these data, prospective suppliers as well as other parties agree to assume all risks associated therewith. Without limitation of the foregoing, prospective suppliers and other parties should carefully assess the uncertainty associated with future load obligations, including variations in customer usage and migration to Retail Electric Suppliers.

Please note that the last data update was completed in May 2010. No further updates are planned at this time.


Last Updated: Wednesday, May 26, 2010

Complete Data Set

	Complete set of ComEd data as of the date posted. Complete ComEd Data Set Date Posted Date Through 5/25/2010

Data Description

	Data Description Date Posted Date Through 5/26/2006

Aggregate

	ComEd zonal hourly load associated with all customers, including customers who have elected to receive service from a Retail Electric Supplier as well as all customers who have elected to take unbundled service under Rider PPO-MVM less all wholesale customer load. Total Retail Hourly Load includes appropriate distribution and transmission system losses. Total Retail Hourly Load Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Daily Capacity Peak Load Contributions (“PLCs”) and Network Transmission Service Peak Loads (“NSPLs”) for the total retail load, including customers who have elected to receive service from a Retail Electric Supplier as well as all customers who have elected to take unbundled service under Rider PPO-MVM. Retail PLCs and NSPLs are equal to the total zonal PLCs and NSPLs less the PLCs and NSPLs associated with wholesale customers. This data series is based on data reported to PJM. Total Retail Peak Load Share Date Posted Date Through 4/26/2007 December 06 5/25/2010 April 10 ComEd zonal hourly load associated with all customers, including customers who have elected to take service under Rider PPO-MVM less all wholesale load and less all load served by Retail Electric Suppliers including appropriate distribution and transmission system losses. Total CPP Hourly Load Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Daily Capacity Peak Load Contributions and Network Transmission Service Peak Loads for the total CPP load, including customers who have elected to take service under Rider PPO-MVM. CPP PLCs and NSPLs are equal to the total zonal PLCs and NSPLs less the PLCs and NSPLs associated with wholesale customers and customers served by Retail Electric Suppliers. This data is based on data reported to PJM. Total CPP Peak Load Share Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Number and percentage of customers and their associated electricity usage that have switched to a Retail Electric Supplier and/or returned to ComEd service, divided into a residential group, a small commercial and industrial group (customers less than 1 MW), a large commercial / industrial group (customers 1 MW and over), and a governmental group as provided by ComEd to the Illinois Commerce Commission on a monthly basis. Switching Statistics Date Posted Date Through 2/26/2007 December 05 2/24/2010 December 09 5/25/2010 April 10 Number of customers and their associated electricity usage and kW demand that are on ComEd service and that have switched to a Retail Electric Supplier divided into several size categories such as residential, 25 kW or less, 25 kW to 100 kW, 100 kW to 400 kW, etc. Detailed Switching Statistics, Customer Counts, and Size Distributions Date Posted Date Through 8/25/2006 June 06

Competitive Procurement Process – Annual (“CPP-A”)

	Hourly load of ComEd’s larger commercial and industrial interval metered customers (over 400 kW) whose primary service is CPP-A. Customers whose primary service is CPP-A include customers who take CPP-A service; customers who elected PPO-MVM service but who, absent this election, would have defaulted to CPP-A service, customers who take service from a Retail Electric Supplier but who, absent this election, would have defaulted to CPP-A service; and customers who have elected real-time pricing service but who, absent this election, would have defaulted to CPP-A. Customers who default to CPP-A service are larger commercial and industrial customers (over 400 kW) excluding self-generators and customers (generally 3 MW and over) whose electric service rate has been declared competitive. This load data is grossed up by a loss factor to appropriately reflect distribution and transmission system losses. Primary CPP-A Hourly Load Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Daily Capacity Peak Load Contributions and Network Transmission Service Peak Loads for the Primary CPP-A load. Primary CPP-A Peak Load Share Date Posted Date Through 4/26/2007 December 06 5/25/2010 April 10 Hourly load of all of ComEd’s larger commercial and industrial interval metered customers (over 400 kW) who are eligible to take electric service under an electric service rate that has not been declared competitive, and who have not elected service from a Retail Electric Supplier and thus take service under a ComEd bundled rate (including PPO-MVM customers), and who have not elected to take real-time pricing service, and customers who are not self-generators. This load data is grossed up by a loss factor to appropriately reflect distribution and transmission system losses. CPP-A Hourly Load Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Daily Capacity Peak Load Contributions and Network Transmission Service Peak Loads for the CPP-A load. CPP-A Peak Load Share Date Posted Date Through 4/26/2007 December 06 5/25/2010 April 10 Based on customer election information as of December 2006. Updated CPP-A Load Information Date Posted Date Through 12/26/2006

Competitive Procurement Process – Hourly (“CPP-H”)

	Hourly load of ComEd’s larger commercial and industrial customers whose primary service is CPP-H. Customers whose primary service is CPP-H include customers who take CPP-H service; customers who take service from a Retail Electric Supplier but who, absent this election, would have defaulted to CPP-H service; and customers who have elected hourly energy pricing service. Customers who default to CPP-H service are larger commercial and industrial customers that have been competitively declared (generally 3MW and over), and self-generating customers. This load data is net of nominal QF and Independent Power Producer generation and is grossed up by a loss factor to appropriately reflect distribution and transmission system losses. Primary CPP-H Hourly Load Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Daily Capacity Peak Load Contributions and Network Transmission Service Peak Loads for the Primary CPP-H load. Primary CPP-H Peak Load Share Date Posted Date Through 4/26/2007 December 06 5/25/2010 April 10 Hourly load of all of ComEd’s larger commercial and industrial customers (generally 3 MW and over) whose electric service rate has been declared competitive and who do not elect service from a Retail Electric Supplier, customers who have voluntarily elected hourly energy pricing service, and customers who are self-generators. This load data is net of nominal QF and Independent Power Producer generation and is grossed up by a loss factor to appropriately reflect distribution and transmission system losses. CPP-H Hourly Load Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Daily Capacity Peak Load Contributions and Network Transmission Service Peak Loads for the CPP-H load. CPP-H Peak Load Share Date Posted Date Through 4/26/2007 December 06 5/25/2010 April 10

Competitive Procurement Process – Blended (“CPP-B”)

	Derived by subtracting Primary CPP-A Hourly Load and Primary CPP-H Hourly Load from Total Retail Hourly Load. This hourly load data includes the load of residential, small commercial (generally 0 to 400kW), and lighting customers whose primary service is CPP-B. Customers whose primary service is CPP-B include customers who take CPP-B service; customers who take service from a Retail Electric Supplier but who, absent this election, would have defaulted to CPP-B service; customers who elect real-time pricing but who, absent this election, would have defaulted to CPP-B service; and customers who have elected PPO-MVM service but who, absent this election, would have defaulted to CPP-B service. Customers who default to CPP-B service are residential, small commercial (0 to 400 kW) and lighting customers. This load data appropriately reflects distribution and transmission system losses. Primary CPP-B Hourly Load Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Daily Capacity Peak Load Contributions and Network Transmission Service Peak Loads for the Primary CPP-B load. Derived by subtracting Primary CPP-A Peak Load Share and Primary CPP-H Peak Load Share from Total Retail Peak Load Share. Primary CPP-B Peak Load Share Date Posted Date Through 4/26/2007 December 06 5/25/2010 April 10 Derived by subtracting CPP-A Hourly Load and CPP-H Hourly Load from Total CPP Hourly Load. This hourly load data includes the load of residential and smaller commercial customers (0 to 400 kW) who have not elected service from a Retail Electric Supplier and thus take service under a bundled ComEd rate, and who have not elected to take real-time pricing service including appropriate distribution and transmission system losses. CPP-B Hourly Load Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Daily Capacity Peak Load Contributions and Network Transmission Service Peak Loads for the CPP-B load. Derived by subtracting CPP-A Peak Load Share and CPP-H Peak Load Share from Total CPP Peak Load Share. CPP-B Peak Load Share Date Posted Date Through 4/26/2007 December 06 5/25/2010 April 10

Other

	Historical load profiles of customers by Fixed Price Section customer supply groups. Historical Customer Supply Group Load Profiles and Methodology Date Posted Date Through 4/28/2006 January 06 8/15/2006 Assembled historical generation values of ComEd customer accounts defined by PJM as nominal hourly generation of small Qualified Facilities (less than 10 MW) located in ComEd's service territory. Historical Small Qualified Facility Hourly Generation Date Posted Date Through 4/26/2007 December 06 5/25/2010 February 10 Historical hourly inadvertent energy as allocated and reported by PJM. Inadvertent energy results from deviations, on a control-area basis, between scheduled power flow and actual power flow. Such deviations cause Inadvertent Interchange between PJM and other control areas. PJM calculates this as: net PJM schedules less net external ties. The difference (positive or negative) is allocated to ComEd based on fully metered load ratio shares. Inadvertent Energy Date Posted Date Through 4/28/2006 January 06 Description of ComEd’s Active Load Management (“ALM”) program types and total ALM capacity. Note ComEd’s ALM program complies with PJM rules and definitions. It includes the following ALM types: Firm Service Level, Direct Load Control, and Guaranteed Load Drop. Active Load Management Characteristics Date Posted Date Through 4/28/2006 April 06 ComEd’s effective PJM rates by month for its historical CPP load share serving responsibility for the following: Schedule 1A - Transmission Owner Scheduling, System Control & Dispatch; Schedule 2 - Reactive Support & Voltage Control; Schedule 3 - Regulation & Frequency Response; Schedule 4 - Energy Imbalance; Schedule 5 - Operating Reserves - Spinning; Schedule 6 - Operating Reserves - Supplemental; Schedule 6A - Black Start; Schedule 9 – PJM Scheduling, System Control & Dispatch; 60-day Reconciliation; Inadvertent Energy; Meter Correction PJM Billing Data Date Posted Date Through 1/24/2007 December 06 Planning or electric control area hourly load as reported to the Federal Energy Regulatory Commission by ComEd in Form 714, which includes the load of ComEd customers, the load of municipal utilities, etc FERC 714 Houly Load Date Posted Date Through 5/26/2006 December 02