The term Annex 3 refers to Annex 3 of the Access Contract. This Annex is signed by the Access Holder - or Access Contract Holder - (ACH) with a Balance Responsible Party (BRP) and Supplier (SUP).
In this Annex, the Access Holder designates to Elia who are the Balance Responsible Party and Supplier responsible for the selected Access Point(s).
All information regarding this process is explained in the Access Contract. You can find more information about the access contract on our website: https://www.elia.be/en/customers/access/access-contract