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PECO to Transition to Backcast Energy Scheduling for Supplier Requirements Email This
Story 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,"
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.