1. October 12, 2007 ERCOT Regional Planning Group Meeting RPG-CREZ Task Force Status Report Warren Lasher System Assessment

2. 2 ERCOT Regional Planning Group Meeting October 12, 2007 Work Accomplished 5 RPG-CREZ Meetings have been held (Aug. 31, Sept. 7, 14, 28, and Oct. 8) The following issues have been addressed: −Issues List −Generic assumptions for 345-kV transmission (modeling parameters and costs) −765-kV transmission technology −HVDC transmission technology −Initial possibilities for CREZ collection lines

3. 3 ERCOT Regional Planning Group Meeting October 12, 2007 Issues List A list of issues has been developed and has been discussed at several RPG-CREZ meetings. This list is available at the RPG-CREZ web-page Now that the Interim Order has been issued, the Issues List will be reevaluated at the next RPG- CREZ meeting (10/19).

4. 4 ERCOT Regional Planning Group Meeting October 12, 2007 345-kV Technology Generic Data NOTE: IMPEDANCE BASED UPON 100MVA P.U / MILE 1 CKT. 2 CKT. 1 CKT. 2 CKT. CONDUCTOR STRUCTURE TYPERJXB RATE A RATE B $M MVA/ $M 2-1590 ACSR DC LATTICE VERTICAL 2.92E- 05 4.61E- 04 9.17E- 031,631 $1.4$1.681,1651,942 2-959 ACSS/TW DC LATTICE VERTICAL 4.78E- 05 4.83E- 04 8.85E- 031,969 $1.3$1.561,5152,524 2-1433 ACSSDC LATTICE 3.00E- 05 4.70E- 04 9.02E- 032,988 $1.5$1.801,9923,320 RJXB RATE A RATE B Cost 600 Mva Auto 2.50E- 04 1.90E- 020600 $8 M 800 Mva Auto 1.80E- 04 1.60E- 020800 $9 M RING BUS 6 - LINE TERMINALS =$15 M BREAKER & 1/2 > 6 - LINE TERMINALS =$25 M

5. 5 ERCOT Regional Planning Group Meeting October 12, 2007 765-kV and HVDC Technology Vendors and stakeholders provided technical discussions of these technologies. ETT Representatives presented a description of 765-kV transmission. ABB and GE representatives described classic HVDC technology, “HVDC-Light” technology, and Variable Frequency Transformers.

6. 6 ERCOT Regional Planning Group Meeting October 12, 2007 CREZ Connection Pathways Preliminary discussions have been conducted regarding possible pathways for connecting CREZ areas to existing ERCOT transmission infrastructure. Additional discussions will be held at future RPG- CREZ meetings.

7. 7 ERCOT Regional Planning Group Meeting October 12, 2007 Project Timeline 123456789101112 Gridlines Represent 2-Week Periods Gather Options for Connections in CREZ Areas Stability Analysis Evaluate Options for System Connections Establish Mailing List and Set Meeting Schedule Modify Base Case for Higher Wind Scenarios Incorporate Results of A/S Study Review Results Evaluate System Upgrade Options for Higher Wind Scenarios ERCOT Review and Report

8. Questions or Comments?