Countertrading Operations(ACBs) are set out in the Procedures Manual for the Portugal-Spain Interconnection Joint Management Mechanism.
ACBs are implemented when the value of the available interconnection capacity, in compliance with security criteria, is lower, in one of the directions, than the overall electrical power exchange programme resulting from the anticipated programming.
When implementing ACBs, electrical systems operators establish a new coordinated electrical power exchange programme at the interconnection, in the opposite
direction to that initially programmed, in order to ensure that the overall value of the programme is not greater
than the value of the available capacity.
Information on ACBs: