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Transmission Loading Relief (TLR) Procedure
TLR Investigation ReportsTLR Investigation Procedure

The NERC TLR Procedure is an Eastern Interconnection-wide process that allows Reliability Coordinators to mitigate potential or actual operating security limit violations while respecting transmission service reservation priorities. A TLR log contains the details of TLR incidents reported by Reliability Coordinators who are required to complete the logs whenever they invoke TLR Level 2 or above. 

For information about the TLR procedure and transmission service priorities, please refer to NERC Reliability Standard IRO-006-5 – Reliability Coordination – Transmission Loading Relief and IRO-006-EAST-1 Transmission Loading Relief Procedure for the Eastern Interconnection. These two documents are available on the Reliability Standards page.




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