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PECO to Transition to Backcast Energy Scheduling for Supplier Requirements

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October 21, 2010

PECO has proposed changes to its Electric Generation Supplier (EGS) tariff to modify the process for estimating a supplier's load requirements.

PECO said that it is changing its energy scheduling for EGSs from day ahead forecasting to day after backcasting. "Backcasting allows PECO to use the actual PECO zone load for the energy delivery day so there is a more definite target used in the calculations.  This, in addition to using actual weather data, leads to a more accurate first settlement with PJM Interconnection ('PJM').  By making this change PECO is also in alignment with the standard utilized by other distribution companies for PJM energy scheduling," PECO said.

An EGS will now have the option of providing a backcast for its hourly metered customers but may decline this option and accept the PECO-provided backcast.  EGS-provided backcasts for hourly metered customers should include estimated losses based on the PECO-furnished loss factors for each rate class.

PECO will not override an EGS-provided backcast with its own, although it may reject the EGS-provided backcast.  When conditions permit, a PECO Staff member will attempt to contact the EGS to explain the reason for rejection and resolve backcast problems prior to the submission deadline.  If the reason for rejecting the EGS-submitted load backcast values cannot be resolved earlier than one hour prior to the current day's PJM daily accounting deadline, the scheduling process will continue using the PECO backcast values.

PECO-provided values shall be binding for any EGS not electing to provide its own valid backcasts for hourly metered customers.

PECO removed language indicating that an EGS may provide its own backcasts for monthly metered customers as PECO does not currently provide this capability to EGSs.

The modified tariff adds a new section on Unaccounted-for Energy (UFE) stating that PECO will apply UFE to schedules for both EGS load and PECO default service load based on load ratio share, and will add UFE to the backcast kW for each hour prior to PJM submittal.

Additional modifications to the tariff have also been submitted to reflect recent PUC orders.  Some of the changes include: updating the posting of the retail customer list to a monthly basis; referencing the PUC order that directs PECO to no longer request a Letter Of Authorization from EGSs for usage requests; and updating the rate for the load data supply charge.

   
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