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CenterPoint Proposed Houston Area Constraint Mitigation Project Information Presentation to TAC

CenterPoint Proposed Houston Area Constraint Mitigation Project Information Presentation to TAC January 6, 2005. Presentation is for informational purposes only. No determination or support is requested at this time. South to Houston Thermal Constraint.

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CenterPoint Proposed Houston Area Constraint Mitigation Project Information Presentation to TAC

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  1. CenterPoint Proposed Houston Area Constraint Mitigation Project Information Presentation to TAC January 6, 2005

  2. Presentation is for informational purposes only. No determination or support is requested at this time.

  3. South to Houston Thermal Constraint Pre-contingency interface limit of approximately 2000 MW Loss of STP to Dow double circuit: ckt 39 STP to WAP becomes the limit with a 1413 MVA rating X

  4. North to Houston Thermal Constraint Pre-contingency interface limit of approximately 2400 MW X Loss of double circuit line Jewett to TH Wharton and Gibbons Creek to O’Brien: ckt 74 Jewett to Tomball becomes the limit with a 956 MVA rating

  5. Improve system reliability Increase South to Houston transfer capability Thermal capability Voltage stability Increase North to Houston transfer capability Thermal capability Voltage stability CenterPoint Study Goals

  6. Salem Option 27 with Additional 345 kV Improvements THW Fayetteville Addicks Fayette Plant O’Brien Brazos Valley Holman Oasis WAP PHR Dow Hillje To San Antonio STP Upgrade New To White Point

  7. CenterPoint Cost Estimate $110 Million $46 Million $30 Million Option 27 Estimated Cost Thermal Upgrades Estimated Cost Dynamic Reactive Additions Estimated Cost Total = $186 Million

  8. Study Calculated Transfer Capability Gains • Option 27 increases transfer capability from the South zone to the Houston zone by 2800 MW, corresponds to a S-H interface flow of approximately 3850 MW (1050 MW increase) • Option 27 increases transfer capability from the North zone to the Houston zone by 1000 MW, corresponds to a N-H interface flow of approximately 2900 MW (1900 MW increase)

  9. Status • Has completed South Regional Planning Group (stakeholder) presentation and review. • It is widely supported and no dissenting comments were received. • ERCOT Staff independent analysis is currently underway (includes economic impacts). • Many options are included as part of the review. • Expect to bring to TAC and BOD by April

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