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Goals and Objectives

WEST LEVEE TO NORWOOD 345-kV PROJECT Presentation to Technical Advisory Committee April 8, 2004 Transmission Services Operations. Goals and Objectives. Maintain reliable service to customers ERCOT Planning Criteria NERC Planning Standards and Guidelines Good Utility Practice

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Goals and Objectives

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  1. WEST LEVEE TO NORWOOD345-kV PROJECTPresentation toTechnical Advisory CommitteeApril 8, 2004Transmission ServicesOperations

  2. Goals and Objectives • Maintain reliable service to customers • ERCOT Planning Criteria • NERC Planning Standards and Guidelines • Good Utility Practice • Currently in compliance with planning criteria requirements but will not be in 2006 without project. • Build a 345-kV transmission line from West Levee Switching Station to Norwood Switching Station with 2-1590 kcmil ACSR conductor on double-circuit structures, approximately 7 miles. • Estimated Cost $ 10,200,000

  3. Open Process • North Regional Planning Group analysis and input • Project sent to North Regional Planning group on October 22, 2003 • Questions from BEPC were sent to the group Oct. 24, 2003 • Oncor answer to BEPC comments sent to group on Nov. 7, 2003 • TXU Energy sent supporting comments to group on Nov. 17, 2003 • ERCOT independent analysis sent via email February 27, 2004 • ERCOT Acceptance Letter sent via email March 1, 2004 • No dissenting comments received • TAC review and support April 8, 2004

  4. Independent Analysis • ERCOT Staff has performed independent analysis using in-house expertise, models and software tools of these projects • Thermal studies • Using Shaw PSS/E & MUST

  5. Central and South Dallas

  6. Dallas/DFW Area • Dallas County Load - 8600 MW in 2003 • Growth to 9550 MW in 2008. 2.1%/yr from CDR • DFW Load – Denton, Tarrant, Dallas, Collin • 17850 MW in 2003 • Growth to 20100 MW in 2008. 2.4%/yr from CDR • Reduction MWH of generation due to emission reductions mandated by TCEQ • Further reduction of generation by TXU energy for economic operation • No new generation development in area

  7. Options Considered to Maintain Reliability • Option 1 - Build a 345-kV transmission line from West Levee Switching Station to Cedar Hill Switching Station with 2-1590 kcmil ACSR conductor on double-circuit structures, approximately 14 miles. • Estimated Cost $ 18,600,000 • Relieves the overload conditions for the contingencies mentioned but is twice the length of the proposed project. Also, does not establish an additional transmission path between Watermill Switching Station and Norwood Switching Station. The single-circuit 345-kV transmission line from Cedar Hill Switching Station to Norwood Switching Station remains a potential bottleneck for electric power moving across Dallas County. Not Viable • Option 2 - Build a 345-kV transmission line from Sargent Road Switching Station to Forney Switching Station with 2-1590 kcmil ACSR conductor on double-circuit structures, approximately 22 miles. Increase the 345/138-kV autotransformer capacity at Sargent Road Switching Station. Upgrade the 138-kV transmission system out of Sargent Road Switching Station. • Estimated Cost $ 33,300,000 • Relieves the overload conditions for the contingencies mentioned but is three times the length of the proposed project and requires additional upgrades which cause it to be the most expensive option. Also, does not establish an additional transmission path between Watermill Switching Station and Norwood Switching Station. Not Viable

  8. Options Considered to Maintain Reliability • Alternative 3 – Increase the 345/138-kV autotransformer capacity at Norwood Switching Station, Sargent Road Switching Station and Watermill Switching Station. Upgrade the 138-kV transmission system out of Watermill Switching Station. • Estimated Cost $ 14,100,000 • Relieves the overload conditions for the contingencies mentioned but does not provide transmission facilities to utilize the 345/138-kV autotransformer capacity at Sargent Road Switching Station and West Levee Switching Station. Portions of this option may be required as separate projects in the future to accommodate load growth in the Dallas area. Use of these facilities in lieu of the West Levee Switching Station to Norwood Switching Station 345-kV transmission line reduces the flexibility to serve future load growth in Dallas County. Also, does not strengthen the 345-kV transmission system and places a heavier burden on the 138-kV transmission system in Dallas County. Not Viable

  9. Estimated Cost • 345 kV Project from West Levee to Norwood • $ 10.2 M estimate • TCOS $ 1.7 M • Based upon 16.5% annual carrying charge rate These are functional estimates based upon typical project costs, which are subject to change and should not be presumed to capture the exact amount or timing of projected capital expenditures.

  10. Recommendation • Endorse the need for the West Levee to Norwood 345-kV project • Comply with ERCOT Planning Criteria

  11. Questions, Discussion & Determination Due to its very nature, transmission planning is a continuous process and is constantly changing due to the addition (or elimination) of plans for new generation, transmission facilities, equipment, or loads. Benefits of good planning are not realized until transmission projects are completed and placed in service.

  12. TXU Energy Comments • TXU Energy submits the following comments regarding Oncor’s report of 10-20-2003 for the proposed West Levee - Norwood 345kV line to be placed into operation by the of summer 2006. • Currently the Watermill - West Levee 345 kV Line is the only 345 kV source to the two 345/138 kV autotransformers at West Levee Switching Station. With the ongoing installation of the Sargent Rd 345/138 kV autotransformer and the associated Watermill - West Levee 2nd 345 kV circuit by summer of 2004, this creates a situation where three 600 MVA, 345/138 autotransformers are fed by a single radial source. The construction of an alternate 345 kV source between West Levee and Norwood will increase system reliability by reducing contingency overloads on the autotransformers at West Levee and Sargent Rd. Additionally, the Dallas/Ft. Worth area is listed as one of the top five areas for Local Congestion in the 2003 ERCOT Report on System Constraints. There is a critical need to maintain system reliability and reduce congestion in the DFW area particularly in the four county area which comprises the Environmental Protection Agency (EPA) designated non-attainment area. The EPA State Implementation Plan (SIP) and Senate Bill 7 mandated specific actions to reduce emissions of NOX from within the area by 2003, with additional reductions required by 2005. The existing DFW transmission system was designed to operate in conjunction with the older more inefficient gas units at a time when system heat rates were substantially higher than they are today. This dependency on local area generation to maintain transmission security has led to the significant local congestion as discussed previously. Therefore, it is imperative that additional transmission capacity be constructed to import power to DFW from remote generation.

  13. TXU Energy Comments cont. • TXU Energy has reviewed the four options presented in the Oncor report and supports Option 1, which is the construction of the 7-mile 345 kV Line between West Levee and Norwood. In addition to being the best economic choice from simply a TCOS perspective, Option 1 is a necessary component of the bulk projects required to eventually alleviate reliance on local, high cost/high emission generation for congestion management in DFW. Additionally, it is recognized that highly networked areas such as DFW often have overlapping solution options, however, we feel that option 1 is the best option to provide the bulk transmission support required in the development of a cohesive, least-cost DFW development plan. Option 1 also has the benefit of reducing system VAR losses by approximately 200 MVAR for an outage of the Watermill- West Levee/ West Levee – Sargent Rd 345 kV double circuit line. The reduction of VAR losses during contingency is somewhat analogous to the addition of 200 MVAR of dynamic VAR support by a device such as an SVC. In the voltage constrained DFW area this incremental dynamic VAR support is extremely beneficial. Option 4 provides similar reduction in VAR losses during contingencies; however Option 4 may require additional transmission line upgrades for the full benefits to be attained. Additionally, Option 4 would increase the number of 600 MVA autotransformers being served from the single source to four, rather than three today mentioned above. • In summary, TXU Energy is supportive of the West Levee – Norwood 345 kV Line as part of a larger group of projects that will reduce the uneconomic local congestion being experienced in the DFW area and appreciates the opportunity to comment.

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