There are two types of notification to the ECVAA (Energy Contract Volume Aggregation Agent)
- additive - will send any new trades for each relevant half hour to be added by Elexon onto the aggregate of any previous trades notificed by counterparty
- net (overwrite) methods - will simply be a new declaration for the two parties' contract position.
The GTMAs (Grid Trade Master Agreement) in place for EDF Energy pre-determines that notifications are sent through the net overwrite method.
EDF Energy is responsible for acting as the ECVNA (Energy Contract Volume Notification Agent) and generating CNs for the external counterparties and sending them to Elexon.
This is done by running the NETA-CN3B (dispatch notifications for all days from day+1 and day +7) and WTHDAYCNA (dispatch notifications for within day and day +1) alinge batches.
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