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TLR Levels
TLR Levels
TLR Level Reliability Coordinator Action Comments
1 Notify Reliability Coordinators of potential System Operating Limit (SOL) or Interconnection Reliability Limit (IROL)violations.  
2 Hold T ransfers at present level to prevent SOL or IROL violations. Of those transactions at or above the Curtailment Threshold, only those under existing Transmission Service reservations will be allowed to continue, and only to the level existing at the time of the hold. Transactions using Firm Point-to-Point Transmission Service are not held. See Attachment 1 to IRO-006, Section 2.2.
3a Reallocation of Transmission Service by curtailing Interchange Transactions using Non-firm Point-to-Point Transmission Service to allow Interchange Transactions using higher priority Transmission Service. Curtailment follows Transmission Service priorities. Higher priority transactions are enabled to start by the Reallocation process. See Attachment 1 to IRO-006, Section 2.3 and Section 6.0.
3b Curtail Interchange Transactions using Non-firm Point-to-Point Transmission Service to mitigate an SOL or IROL violation. Curtailment follows Transmission Service priorities. There are special considerations for handling Transactions using Firm Point-to-Point Transmission Service. See Attachment 1 to IRO-006, Section 2.4 and Section 7.0.
4 Reconfigure transmission system to allow Transactions using Firm Point-to-Point Transmission Service to continue. There may or may not be an SOL or IROL violation. There are special considerations for handling Interchange Transactions using Firm Point-to-Point Transmission Service. See Attachment 1 to IRO-006, Section 2.5.
5a Reallocation of Transmission Service by curtailing Interchange Transactions using Firm Point-to-Point Transmission Service on a pro rata basis to allow additional Interchange Transactions using Firm Point-to-Point. Attempts to accommodate all Transactions using Firm Point-to-Point Transmission Service, though at a reduced (“pro rata”) level. Pro forma tariff also requires curtailment/ Reallocation on pro rata basis with Network Integration Transmission Service and Native Load. See Attachment 1 to IRO-006, Section 2.6 and Section 6.0.
5b Curtail Interchange Transactions using Firm Point-to-Point Transmission Service to mitigate an SOL or IROL Violation Pro forma tariff requires curtailment on pro rata basis with Network Integration Transmission Service and Native Load. See Attachment 1 to IRO-006, Section 2.7.
6 Emergency Procedures Could include demand-side management, re-dispatch, voltage reductions, interruptible and firm load shedding. See Attachment 1 to IRO-006, Section 2.8.
0 TLR Concluded Restore transactions. See Attachment 1 to IRO-006, Section 2.9.
 
 
 

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