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2007 South DC-Tie Emergency Operation TPTF November 27, 2007 Updated for February 4, 2008 TPTF

2007 South DC-Tie Emergency Operation TPTF November 27, 2007 Updated for February 4, 2008 TPTF. Agenda . Current Operations of the DC-Ties Summary of the Schedules flows in the last 12 Months. ERCOT DC-Ties . ERCOT-CFE Operational DC-Ties Eagle Pass (DC_S, 36 MW)

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2007 South DC-Tie Emergency Operation TPTF November 27, 2007 Updated for February 4, 2008 TPTF

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  1. 2007 South DC-Tie Emergency OperationTPTFNovember 27, 2007Updated for February 4, 2008 TPTF

  2. Agenda • Current Operations of the DC-Ties • Summary of the Schedules flows in the last 12 Months

  3. ERCOT DC-Ties • ERCOT-CFE Operational DC-Ties • Eagle Pass (DC_S, 36 MW) • Laredo Variable Frequency Transformer (DC_L, 100 MW) • Sharyland Railroad (DC_R, 150MW) • ERCOT-SPP Operational DC-Ties • North DC_Tie (DC_N, 220 MW) • East DC_Tie (DC_E 600 MW) DC_N 220 MW DC_E 600 MW DC_S 36 MW DC_L 100 MW DC_R 150 MW

  4. ERCOT DC-Ties -- Operations • ERCOT/SPP DC-Ties • Open for commercial transactions and operation • ERCOT/CFE DC-Ties • Interim agreement in place with CFE. Addresses emergency assistance through the DC-Tie and BLT • Transmission Outages, Supply shortages, voltage deficiencies and other • Currently only utilized under emergency conditions • Transmission Emergency Condition • EECP

  5. ERCOT received DC-Tie flows 32 times through the South DC-Ties from October 2006 to August 2007. Each DC-Tie flow corresponds with a declaration of an Emergency Condition. South DC Tie Requests 5

  6. Eagle Pass DC-Tie Emergency Assistance Schedules 25 Times due to Transmission Emergency Conditions • October 06 (6 days) – Planned outage on Uvalde to Asphalt Mines and Forced outage on Asherton to North Laredo • November 06 (5 days) – Planned outage on Uvalde to Asphalt Mines • December 06 (2 days) – Planned outage on Uvalde to Asphalt Mines • January 07 (5 days) – Del Rio Area experienced a blackout during the planned outage on Brackettville to Hamilton and a consequent forced outage due to an unexpected cold front. • February 07 (7 days) Planned outage on Brackettville – Asphalt Mines 2 Times due to EECP on June 18th, 2007 & August 1st, 2007

  7. Laredo VFT Emergency Assistance Schedules 3 Times due to Transmission Emergency Conditions July 07 (3 days) Planned outage of an RMR unit in the Laredo area 2 Times due to EECP on June 18th, 2007 & August 1st, 2007 Railroad DC-Tie Schedules No emergency schedules in the Tie 7

  8. Del Rio Area Planned Outage on Uvalde to Asphalt Mines Oct 25 – Dec 3, 2006 Del Rio Area Planned Outage on Brackettville – Hamilton Jan 30 – Feb 2 & Feb 19 – April 19 Planned Outage on Brackettville – Asphalt Mines Feb 14 - 19 Forced Outage on Asherton – North Laredo Oct 31, 2006

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