Energy Imbalance (Schedule 4)

What is Energy Imbalance (EI)?

When there is a difference in the scheduled load vs. the actual delivery to load (eTag or CDE) within BPA's BAA:

• If schedule vs delivered is higher, then BPA supplies the INC (from available capacity) at the ACS rate
• If schedule vs delivered is lower, than BPA absorbs the DEC and credits at the ACS rate.

Example 1:  Schedule (100 MW) < Load (110 MW) = BPA provides 10MW of EI

Example 2: Schedule (100 MW) < Load (90MW) = BPA/FCRPS absorbs 10MW of EI

EI is a service provided by the BAA when a difference occurs between the scheduled and the actual delivery of energy to a load located within that BAA and is used by anyone scheduling transmission service to serve load within the BPA BAA

To the extent the BAA operator performs this service for the Transmission Provider, charges to the Transmission Customer are to reflect only a pass-through of the costs charged to the Transmission Provider by that Control Area operator.

Following are additional resources:

• See the Transmission Rates webpage for the latest Ancillary Services Rates.
  • Charge for Capacity (Schedule 3)
  • Charge/Credit for Energy (Schedule 4)
• BPA Open Access Transmission Tariff - Schedule 4
• Energy Imbalance Service Business Practice
• EIM Business Practice

Additional questions? Contact your Account Executive!