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1 ICTE TLR 5 Investigation Report Flowgate 1902 (Scott-Bonin 138kV for the loss of Renaud-Bonin 230kV) TLR Level 5: December 6, 2006 Report Issued: 1. Description of purpose/cause of hold/curtailment. This report is submitted in accordance with the NERC Transmission Loading Relief Investigation Procedure for the TLR 5 event that occurred on Flowgate 1902 on December 6, 2006. Flowgate 1902 is an Entergy flowgate. The TLR 5 was in effect from 08:05 until 11:00 on December 6, 2006. Projected post-contingent flows on the Scott- Bonin 138kV line for the loss of the Renaud-Bonin 230kV line exceeded the SOL and there were no non-firm transactions on the flowgate. 2. Facility/flowgate limitations and flows at the time the TLR was initiated. At the time the TLR 5B was first issued, the Limiting Element was rated at 247 MVA. Flow on the Limiting Element was 47 MVA. Flow on the Contingent Element was 421 MVA. The LODF was approximately 64.0%. Post-contingent flow on the Limiting Element was approximately 313 MVA. 3. TLR levels, timing, and relief requested amounts. TLRs levels, timing and relief requested amounts are shown in the table below: Date Time Level Relief Requested Firm PTP Transactions Curtailed 12/06/2006 08:05 TLR Level 5B 70.0 115 12/06/2006 09:00 TLR Level 5A 60.0 165 12/06/2006 10:00 TLR Level 5A 0.0 94 12/06/2006 11:00 TLR Level 3A 0.0 0 12/06/2006 12:00 TLR Level 3A 10.0 0 12/06/2006 13:00 TLR Level 3A 0.0 0 12/06/2006 14:00 TLR Level 3A 0.0 0 12/06/2006 15:00 TLR Level 3A 0.0 0 12/06/2006 16:00 TLR Level 3A 0.0 0 12/06/2006 17:00 TLR Level 3A 0.0 0 12/06/2006 17:40 TLR Level 0 0.0 0 4. Transmission and generation outages or changes from prediction that may have contributed. CLECO had a scheduled line outage on Richard-Habetz 138 kV in the area that contributed to this issue. See first page of SDX outages page 5 5. Procedures implemented prior to hold/curtailment.
