475 It would seem that the assumption of no direct interaction across the ESI is not enforced in EI as multiple Resources inside the ESI are exposed to the grid side of the ESI
If the customer side of the interface is managed using the VEN/VTN approach wherein the ESI is a VEN that does not expose any VTNs inside the ESI VEN then we can still observe 475.
1238 Do all VENs have an ESI? For example does an aggregator acting as a VEN to an ISO have an ESI?