ICTE TLR 5 Investigation Report Flowgate (West Memphis Xmfr 161/500kv ftlo San Souci Shelby 500kv) TLR Level 5: June 20, 2011 Report Issued:

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1 ICTE TLR 5 Investigation Report Flowgate (West Memphis Xmfr 161/500kv ftlo San Souci Shelby 500kv) TLR Level 5: June 20, 2011 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 on June 20, Flowgate is an Entergy flowgate. The TLR 5 was in effect from 5:28 PM on June 20, 2011 until 8:30 PM on June 23, On June 22, 2011, the Reliability Coordinator had to close out the TLR due to a problem with NNL calculations in IDC and immediately go back into the TLR 5. This occurred at 2:35 AM on June 22, Projected post-contingent flows on the West Memphis Xmfr 161/500kv ftlo San Souci Shelby 500kv line exceeded the SOL. 2. Facility/flowgate limitations and flows at the time the TLR was initiated. At the time the TLR 5a was issued, the Limiting Element was rated at 200 MVA. Flow on the Limiting Element was 74 MVA. Flow on the Contingent Element was 1426 MVA. The LODF was approximately 20%. Post-contingent flow on the Limiting Element was approximately 353 MVA. 3. TLR levels, timing, and relief requested amounts. TLRs levels, timing and relief requested amounts are shown on pages 7 through Transmission and generation outages or changes from prediction that may have contributed. There was an unplanned outage on the Keo-West Memphis 500kv line in the ICTE system associated with this flowgate. There were no abnormal load changes. There was 0 mw of non-firm service impacting the flowgate day of since the RC was in a TLR 5 event. With the Keo-West Memphis 500 kv out of service due to storm damage, it was determined that the loss of the SanSouci-Shelby 500 kv line could cause possible voltage concerns on the underlying 161 kv system in the area. The normal SOL limit on the West Memphis 500/161 kv transformer is 450 MVA. Due to the current topology with the West Memphis-Keo 500 kv line out of service and the risk of voltage concerns with the loss of the SanSouci-Shelby 500 kv line, the SOL was changed to 200 MVA until the West Memphis-Keo 500 kv line was returned to service. With the current configuration if the contingency occurred on the SanSouci-Shelby 500 kv with the West Memphis-Keo 500 kv out of service, the 500/161 kv transformer at West Memphis would flow 161/500. This would cause a burden on the underlying 161 kv system trying to feed and support the 500 kv system to the East. 5. Procedures implemented prior to hold/curtailment. There were not enough non-firm transactions with greater than 5% TDF available for curtailment to alleviate the flowgate. The system was not re-dispatched to prevent curtailment of firm service. The ICT RC verifies with Entergy s Shift Supervisor before a TLR 5 event is called if there are any re-dispatch options available. The Entergy Shift Supervisor to-date has not offered any re-dispatch solutions to prevent a TLR 5 event.

2 6. The initial investigation shall compare all transaction curtailment lists as generated by the IDC with the list of transactions flowing as determined by the IDC (Whole Transaction Lists) both before and after curtailment. The reasons for any transactions that were excluded from curtailment shall be provided. For those transactions not curtailed, the Reliability Authority will identify those entities and any affiliation with said entities. There were no known transactions excluded from curtailment for this TLR. 7. List of known transactions not in the IDC with Transaction Contribution Factors greater than the curtailment threshold and actions taken to curtail such transactions. There were no known transactions not in the IDC. 8. Excerpts from the RA Operations Log containing information relevant to the TLR event. Information was provided to Reliability Coordinators through the IDC and the RCIS. Also the ICTE Reliability Coordinators logged information describing the actions taken at each issuance of the TLR. 9. Flowgate limitations as identified by security analysis processes conducted by the Reliability Authority for the day prior to the TLR event. In the next day process, we did not see an issue with this flowgate, based off of the peak study. 10. State Estimator snapshots and security analysis, including any contingency analysis or stability analysis, along with any other recorded data indicating need for TLR. The ICTE Reliability Coordinator was monitoring their state estimator for potential issues during this time. Screen shots were taken during each issuance of the TLR level ATC limitations before, during, and after the TLR event. (Requested 7/7) ICT Tariff Administration grants transmission service using an AFC process. This process evaluates each transmission request on a case by case basis. There are no ATC values for individual corridors to or from the Entergy system.

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6 12. Description of actions taken to avoid future hold/curtailments. This TLR was caused by a combination of a forced line outage, load, and system flows. Due to this situation, no actions were taken to avoid future hold/curtailments. 13. Provide IDC generated Congestion Management Reports showing transaction curtailment list and Control Area NNL (network and native load) curtailment responsibility. Congestion Management Reports for each issuance of the TLR have been reviewed and kept on file. These screen shots are not being provided to reduce the size of this report. 14. Re-dispatch actions taken. Entergy had 1279 MW of NNL, SME had 100 MW of NNL, TVA had 66 MW of NNL, and AECI had 106 MW of NNL in the first event. During the second event AECI had NNL of 199 MW, EDE had 2 MW, EES had 2262 MW, SME had 229 MW, SPA had 1 MW and TVA had 108 MW of NNL. Additional Information: On July 6, 2011, the ICT Reliability Coordinator received formal communication regarding this event which will be posted in the next Independent Coordinator of Transmission (ICT) for Entergy - Quarterly Performance Report.

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13 Log Entries

14 Date Time Category 'Detail' Informed by SPP/ICT planning engineers that the SOL limit on FG changed from 450 to 200 due to Wmemphis-Keo outage due to storm damage. EES TOP informed us that of voltage issues ftlo SanSouci-Shelby in the AR area. Upon informing EES SOC supervisor Kelly that ICT RC would be going to a 5A on FG she asked why? We informed her of new SOL limit from 450 to 200 and she disagreed and said that EES's limit was 450 and they were not 06/20/ Other changing it. Issued TLR 5A PC 103%, NNL EES 6.0, SME 0.4, AECI 1.0, TVA 0.3 REF# /20/ TLR - 5a Initial 06/20/ /20/ Other 06/20/ TLR - 5a Reissue 06/20/ /20/ TLR - 5a Reissue 06/20/ /20/ TLR - 5a Reissue 06/20/ /20/ TLR - 5a Reissue 06/20/ /20/ TLR - 5a Reissue 06/20/ /20/ /20/ TLR - 5a Reissue ICT RC called SPP, MISO, TVA, AECI, and SOCO to inform them of the SOL limit of 200 from 450 on FG due to Wmemphis-Keo outage Reissued TLR 5A PC 108%, NNL EES 8.7, SME 0.6, AECI 1.6, TVA 0.5 Reissued TLR 5A PC 160%, NNL EES 29.6, SME 2.0, AECI 5.4, TVA 1.8 Reissued TLR 5A PC 110%, NNL EES 39.6, SME 2.6, AECI 7.2, TVA 2.3 Reissued TLR 5A PC 97%, NNL EES 40.9, SME 2.6, AECI 7.3, TVA 2.4 re-issued tlr 5a PC 98% EES NNL 43, SME 2.6, AECI 7.3 TVA 2.5 re-issued tlr 5a PC 84% EES NNL 31.8, SME 2.2, AECI 5.1

15 06/21/ /21/ TLR - 5a Reissue 06/21/ TLR - 5a Reissue 06/21/ /21/ /21/ TLR - 5a Reissue 06/21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue 06/21/ TVA 1.8 re-issued tlr5a pc 65% NNL EES 11.4, SME 0.8, AECI 1.8, TVA 0.6 re-issued tlr5a pc 97% NNL EES 14.6, SME 0.8, AECI 1.7, TVA 0.6 re-issued tlr5a pc 161% NNL EES 32.8, SME 2.3, AECI 4.8, TVA 1.8 re-issue tlr5a pc143% NNL EES 48.3, SME 3.4, AECI 7.2, TVA 2.7 Re-issued TLR 5A PC 65% (flow has flipped and now feeding the 500 from 161) giving back nnl EES 40.9, SME 3, AECI 6.2, TVA /21/ TLR - 5a Reissue re-issue tlr5a pc97% NNL EES 42.3, SME 3.3, AECI 6.8, TVA /21/ /21/ TLR - 5a Reissue reissued TLR 5 PC 108% 06/21/ /21/ Other 06/21/ TLR - 5a Reissue 06/21/ /21/ Transmission Kelly EES SOC supervisor called to inform that Entergy did not agree with the TLR 5 on FG Reissue TLR. PC 92%. NNL: EES 49.3, SME 3.6, AECI 7.5, TVA 3.0 Eddie Walls from SOCO called to confirm that the FG was built correctly. And that the normal configuration on the XMFR is 500 to 161kv. After double checking the FG summary, did find that FG was built correctly in IDC, which is the 161 to 500kv which is reverse

16 flow from normal due to West Memphis to Keo 500kv line out of service due to strom damage. 06/21/ TLR - 5a Reissue 06/21/ /21/ Transmission 06/21/ TLR - 5a Reissue 06/21/ /21/ /21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue Reissue TLR. PC 103%. NNL: EES 49.8, SME 3.7, AECI 7.6, TVA 3.1 Kevin from TVA called to confirm that the Xmfr at West Memphis was flowing from the 161kv to 500kv was the issue in the West memphis area. Reissue TLR. PC 104%. NNL: EES 51.6, SME 3.8 Reissue TLR. NNL:EES 74.3, SME5.7 Reissued TLR. NNL: EES 75.7, SME 5.7 Reissued TLR. NNL: EES 68.5, SME 5.1, AECI 11.1, TVA 4.1. Spoke with Kevin from TVA and he told us that they have 1 Dell unit on and it can only go to 13 MW. So they will hold what they have and instead of providing 11.1 NNL they will only provide Also spoke with Eddy from SME and he advised that he can only provide 3.17 NNL instead of the 5.1. Reissue TLR. NNL:EES 69.5, SME 6.8, AECI 4.9, TVA 5.2 Eddie SOCO called to inform their SME NNL 6.8 would only provide 4.83 of that

17 06/21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue 06/21/ Reissued TLR 5A PC 49%, NNL EES 46.6, SME 4.2, AECI 3.3, TVA 3.3 Eddie SOCO called to inform that 4.2 NNL will be provided. Reissued TLR 5A PC 77%, NNL EES 35.9, SME 3.2, TVA 2.5 Reissued TLR 5A PC 88%, NNL EES 27.2, SME 2.3, TVA 2.0 Reissued TLR 5A PC 74%, NNL EES 3.8, SME 0.3, TVA /21/ TLR - 5a Reissue Reissued TLR 5A PC 74%, NNL EES 4.3, SME 0.4, TVA /21/ /21/ TLR - 5a Reissue Reissued TLR 5A PC 96% 06/21/ /21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue 06/21/ reissued tlr 5A PC 113% NNl EES 26.8, SME 3.3, AECi 0, TVA 2.7 reissued tlr 5A PC 94% NNl EES 45.4, SME 4.1, AECi 0, TVA 0 reissued tlr 5A PC 138% NNL EES 55.9, SME 3.9, AECi 0, TVA /21/ TLR - 5a Reissue 06/21/ /21/ TLR - 5a Reissue 06/21/ /22/ TVA NNL was 0 previous hr but added 2.7 to the 0.9 issued this hr for a total of 3.6. Told TVA to use the 0.9 for this hr. reissued tlr 5A PC 100% NNl EES 54.0, SME 4.0, AECi 0, TVA 3.8

18 06/22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ Other 06/22/ /22/ TLR - 5a Reissue 06/22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ /22/ TLR - 5a Reissue 06/22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ /22/ TLR - 5a Reissue reissued tlr 5A PC 139% NNl EES 51.9, SME 3.7, AECi 0, TVA 3.4 reissued tlr 5A PC 104%% NNl EES 50.4, SME 4.7, AECi 0, TVA 3.4 Ended TLR 5A on FG to correct NNL issues. started new TLR for West Memphis AT1 161/500 kv FTLO SanSouci- Shelby 500 kv starting at top of hour PC 111% NNL EES 49.5, SME 4.7, TVA windfarm offline no NNL issued to them re-issued tlr5a pc 104% NNL EES 49.4, SME 4.7 re-issued tlr5a pc 144% NNL EES 36.9, SME 4.1 re-issued tlr5a pc 152% NNL EES 47.3, SME 4.8 Reissue TLR. NNL: EES 47.2, SME 4.6 Reissue TLR. NNL: EES 47.5, SME 5.0 Reissue TLR. NNL: 47.9, SME 5.2 Reissue TLR. NNL: EES 50.8, SME 5.5 Reissue TLR. NNL: EES 49.9, SME 5.9. Also spoke with Kevin from TVA and he said that next hour when we reissue this TLR-5 that we can go ahead and put the Dell 1,2,and 3 units back in.

19 06/22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ Generation 06/22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ /22/ TLR - 5a Reissue 06/22/ Reissue TLR. NNL: EES 48.4, SME 5.7 Reissue TLR. NNL: EES 47.8, SME 5.8 Reissue TLR. NNL: EES 46.3, SME 5.8, AECI 7.5 Reissue TLR 5A PC 86%. NNL: EES 29.4, SME 3.8, AECI 4.8 TVA Kevin called to inform that upon reissue of FG 17274, include windfarm generator with associated number G172_G Reissue TLR 5A PC 86%. NNL: EES 29.2, SME 3.6, AECI 4.9, TVA 2.0 Reissue TLR 5A PC 86%. NNL: EES33.0, SME 4.4, AECI 5.5, TVA 2.2 Reissue TLR 5A PC 106%. NNL: EES 45.6, SME 5.3, EDE 1.7, SPA 1.1, AECI 7.2, TVA 2.6 Reissue TLR 5A PC 106%. NNL: EES 47.1, SME 5.3, AECI 8.0, TVA 3.2 Reissue TLR 5A PC 105%. NNL: EES 50.9, SME 5.7, AECI8.5, TVA 3.4 Reissue TLR 5A PC 96%. NNL: EES 59.9, SME 6.7, AECI 10.2, TVA 3.9 Reissue TLR 5A PC 105%. NNL: EES 59.5, SME 6.4, AECI 9.5, TVA 3.8

20 06/22/ TLR - 5a Reissue 06/22/ /22/ /22/ TLR - 5a Reissue 06/22/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ TLR - 5a Reissue re-issue tlr 5a pc 155% EES NNL 58.5, SME 5.9, AECI 8.6 TVA 3.4 tva has taken off dell units, dukehinds coming off at top, looking for additional relief NNL tapped out tlr 5 reissue IDC crash at time of re-issue gave AECI NNL which should be 0 due to units off line EES 56.6, SME 5.6, TVA to maintain due to IDC hickup. No NNL avialbe EES looking to buy jonesboro re-issue tlr 5a PC 145% ees:48 sme:4.1 tva 3.2 NNl at max on IDC re-issue PC 150% NNL EES 47, SME 3.9 TVA 3.1 reissue tlr pc 157% NNL EES 46.2, SME 3.9, TVA 3 PC 170% NNL EES 46.3, SME 3.9 TVA 3.1 PC 170 NNL EES 47.4 SME 4.2 TVA 3.2 afc's 0 out till 10:00 PC 167% NNL 48.6 SME 4.6 TVA 3.5 Reissue TLR. PC 162%. NNL: EES 36.7, SME4.0 Reissue TLR. PC 176%. NNL: EES 40.6, SME 3.5, TVA 2.7 Reissue TLR. PC 168%. NNL: EES 45.1, SME 4.2, TVA 3.5

21 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ /23/ TLR - 5a Reissue 06/23/ TLR - 5a Reissue 06/23/ /23/ /23/ TLR - 5a Reissue 06/23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ Reissue TLR. PC 170%. NNL: EES 58.5, SME 5.0, TVA 3.8 Reissue TLR PC 164%. NNL: EES 59.8, SME 5.2, AECI 9.8, TVA 4.5 Reissue TLR. PC 122%. NNL: EES 66.8, SME 5.5, AECI 10.0, TVA 4.3 Reissue TLR. PC 113%. NNL: EES 66.7, SME 5.8, AECI 10.7, TVA 5.1 Reissue TLR. NNL: EES 66.5, SME 5.7, AECI 10.8, TVA 5.2 Reissue TLR. PC 74%. NNL: EES 69.0, SME 6.1, AECI 11.3, TVA 5.2 IDC gave WSC2 0.1 NNL but SPP RC disregarded it. Reissue TLR. PC 76%. NNL: EES 69.1, SME 5.9, AECI 9.7, TVA 4.1 Reissue TLR. PC 74%. NNL: EES 68.3, SME 6.5, AECI 11.9, TVA 5.2 Reissue TLR. PC 77%. NNL: EES 49.3, SME 5.4 Reissue TLR 5A. PC 89%. NNL: EES 53.1, SME 5.1, AECI 9.1, TVA 3.8

22 06/23/ IDC 06/23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 5a Reissue 06/23/ /23/ TLR - 4 Initial 06/23/ IDC gave AECI and TVA an NNL of 0.0 for HE 19. For HE 20 IDC uped their NNL to AECI 9.1 and TVA 3.8 as well as showing previous hour of AECI 11.9 and TVA 5.2. Reissue TLR 5A. PC 93%. NNL: EES 62.0, SME 6.0, AECI 10.2, TVA 4.5 Reissue TLR 5A. PC 93%. NNL: EES 64.8, SME 6.0, AECI 10.7, TVA 4.5 Reissue TLR 5A. PC 93%. NNL: EES 60.5, SME 5.5, AECI 9.9, TVA /23/ TA Notification notified tariff of change in tlr level afc's still set to 0 PC 75%upfdated ref /23/ TA Notification notified tariff afc's reloaded 06/23/ TLR - 0 Ended TLR 4 issued TLR 0 W. Memphis-Keo back in service rating reloaded to 450 per EES EMS team (has updated EMS) Ref