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ERCOT 2009 Five-Year Transmission Plan Update

ERCOT 2009 Five-Year Transmission Plan Update. Jeff Billo. 2009 Five-Year Transmission Plan: Where we’ve been. 2009 5YTP Scope and Process. VSAT 2009 Voltage Stability Study. SSWG Contingencies. SSWG 09DSB Cases –December TPIT Update. Remove Projects. Stability Interface Limits.

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ERCOT 2009 Five-Year Transmission Plan Update

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  1. ERCOT 2009 Five-Year Transmission Plan Update Jeff Billo RPG Meeting

  2. 2009 Five-Year Transmission Plan: Where we’ve been 2009 5YTP Scope and Process VSAT 2009 Voltage Stability Study SSWG Contingencies SSWG 09DSB Cases –December TPIT Update Remove Projects Stability Interface Limits Conditioned cases UPLAN start case Generation Cost Data Peak Load Topology Generation ERCOT Load Profile Posted on website 2014 Case Posted on website Reliability Analysis RPG Meeting

  3. 2009 Five-Year Transmission Plan: Where we’ve been – 2014 Reserve Margin Issue • 2014 Peak Load = 81762 MW • 2014 Reserve Margin = 7.0% (using SSWG load forecast) • Low reserve margin results in false positives for reliability problems • Mothball capacity ~ 2070 MW (raises reserve margin to 9.6%) RPG Meeting

  4. 2009 Five-Year Transmission Plan: Where we’ve been – 2014 Reserve Margin Issue • Solution: • Create 4 study areas based on weather zones: • Far West, West • East, Coast, South Central, South • North, North Central, East • North Central, South Central • Start with all load areas near ERCOT forecast (2014 peak = 70837 MW, including losses, not including “behind the fence” load) • Create separate case for each study area and scale load in that area to SSWG forecast • Keep mothball units off for study area; mothball units on in other areas • Identify reliability problems by study area RPG Meeting

  5. 2009 Five-Year Transmission Plan: Where we’re at • Identify reliability problems in 2014 and propose initial solutions • Spreadsheet posted • Transmission Owners to review identified problems and solutions and provide feedback/ develop alternatives as necessary • Market Participants to review identified problems and solutions and comment RPG Meeting

  6. 2009 Five-Year Transmission Plan: Where we’re at The following slides highlight a few of the larger projects identified to meet reliability needs in 2014 RPG Meeting

  7. Leander 345 kV solution • Problem: • Techridge-Howard Lane 138-kV line overloads for the loss of McNeil-Decker and Daffin-Dessau 138-kV lines • Summit-Williamson 138-kV line overloads for the loss of Hamilton-Summit and Hamilton-Balcones 138-kV double circuit • Gilleland 345/138-kV autotransformer and McNeil-Summit 138-kV line are heavily congested • Other 138-kV lines in area highly loaded from east towards northwest in Austin area • Techridge-Howard Lane already rated at 710 MVA RPG Meeting

  8. Leander 345 kV solution • Solution: • 2008 LTSA identified need for long term solution in western Williamson County • Create 345-kV bus at Leander (bus 7525) with 345/138-kV autotransformer • Loop one circuit of the Salado-Hutto 345-kV double circuit into Leander creating new ~23 mile 345-kV double circuit • Upgrade Leander-Buttercup 138-kV line to 440 MVA • Solves reliability problem • Has not been evaluated for congestion savings nor compared with other alternative solutions yet RPG Meeting

  9. Galveston import problem • Problem: • 138-kV lines into Galveston overload for loss of other 138-kV lines into Galveston • Solution: • Upgrade Webster-Capedum-Tikki, Webster-La Marque, and Hitchcock-West Galveston 138-kV lines RPG Meeting

  10. Lavon Switch • Problem: • Royse 345/138-kV autotransformer overloads for the loss of the other Royse autotransformer • Solution: • Lavon Switch 345/138-kV station created between Allen and Royse RPG Meeting

  11. Dallas Autotransformer Capacity • Problem: • West Levee 345/138-kV autotransformer overloads for the loss of the other West Levee autotransformer • Solution: • Upgrade both West Levee autotransformers to at least 800 MVA and install a second autotransformer at Sargent Road RPG Meeting

  12. 2009 Five-Year Transmission Plan: Where we’re going 2014 UPLAN start case Reliability Projects 2014 UPLAN initial reliability case Add CREZ facilities: 1. Reliability Project Replacement 2. Additional Reliability Problems Generation Outage Analysis Input from TOs and Market Participants Project Back-out 2014 UPLAN final reliability case 2010-2013 Analysis RPG Meeting

  13. Questions? RPG Meeting

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