Ancillary Services

• ACS are services necessary to support the transmission of energy from resources to loads while maintaining reliable operation of BPA’s Balancing Authority Area in accordance with Good Utility Practice. 
• BPA, as the Transmission Provider, is required to provide ACS under the pro forma tariff.
• Transmission customers are required to purchase certain ACS from BPA under the pro forma tariff.  
• There are additional ACS that the transmission customer must either purchase from BPA, or self-supply through a customer’s own resources or from a third-party accordingly, as required under the pro forma tariff. 

What is the full list of ACS services?

• Schedule 1 - Scheduling, System Control, and Dispatch
• Schedule 2 - Reactive Supply and Voltage Control from Generation Sources
• Schedule 3 - Regulation and Frequency Response
• Schedule 4 - Energy Imbalance
• Schedule 5 - Operating Reserve (Spinning)
• Schedule 6 - Operating Reserve (Supplemental)
• Schedule 9 - Generation Imbalance
• Schedule 10 - Capacity for Generator Balancing (VERBS/VERS & DERBS/DERS)
• Schedule 11 - Real Power Losses (Transmission Losses)