at the ISO/UDC boundary or Control Area boundary.	
Transmission Revenue Credit	The proceeds received by the Participating TO from the ISO for Wheeling service and Usage Charges, plus the shortfall or surplus resulting from any cost differences between Transmission Losses and Ancillary Service requirements associated with Existing Rights or Non-Converted Rights and the ISO’s rules and protocols.	
TRBA (Transmission Revenue Balancing Account)	A mechanism to be established by each Participating TO that has transmission customers that will ensure (a) that all Transmission Revenue Credits flow through to its transmission customers, and (b) that the costs of each applicable non-wires project assessed to a Participating TO under Section 3.7 of the ISO’s Tariff are recovered from the transmission customers of the applicable Participating TO.	
TRR (Transmission Revenue Requirement)	The TRR is the total annual authorized revenues associated with transmission facilities turned over to the Operational Control of the ISO by a Participating TO that has transmission customers, and for which FERC jurisdictional entities are permitted to include in their Access Charges for recovery from customers, or in the case of non-FERC jurisdiction entities, the equivalent revenue amount authorized by the appropriate jurisdictional regulatory authority.