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Entergy Gulf States, Inc. (Louisiana) Proposed Transmission Reliability Projects PowerPoint Presentation
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Entergy Gulf States, Inc. (Louisiana) Proposed Transmission Reliability Projects

Entergy Gulf States, Inc. (Louisiana) Proposed Transmission Reliability Projects

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Entergy Gulf States, Inc. (Louisiana) Proposed Transmission Reliability Projects

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  1. Entergy Gulf States, Inc.(Louisiana)Proposed Transmission Reliability Projects Entergy Transmission Planning Summit New Orleans, LA July 31, 2007

  2. Proposed 2007-10 EGSI-LA Transmission Reliability Projects • Jefferson Davis 69 kV System Improvements • Phase I (2008): • Lawtag-Jennings • Winn cap bank installation • Phase II (2011): • Chlomal-Lacassine • Lacassine breaker installation • Welsh to Lawtag • Port Hudson Bus Upgrade (2007) • McManus Capacitor Bank Expansion (2008) Nesser Sub: Build a new 69kV line (2009) Colonial Academy Cap Bank Installation (2010) • Various Areas: • Circuit Breaker Upgrades (2007 and beyond) Acadiana Area Voltage Improvement (2009) 138 kV Alchem-Monochem: Line Upgrade (2010)

  3. Port Hudson : Bus/Switch Upgrade Scenario: • The Port Hudson 230/69kV auto is rated at 200 MVA, but its 69kV terminal jumper is rated at 135MVA. This terminal along with some associated switches may overload under contingency. Recommended solution: Temporary solution: Upgrade underrated bus section and switches Proposed In-Service Date: 2007 Estimated cost: $60 k Long Term Solution: • Reconfigure Pt. Hudson 69kV substation to a breaker and half or ring bus, or build a new substation adjacent to the existing. Detailed scope and in-service date to be determined.

  4. Jefferson Davis: 69 kV System Improvement Scenario: • The 69kV transmission system between Jennings and Chlomal substations serves approximately 90 MW of load including the radial transmission system from Lawtag substation. The main "trunk" of this system is the contiguous segments comprised of Line 13 (Jennings-Compton-Elton), Line 16 (Elton-Tupper-Serpent-Carter), and Line 11 (Carter Lacassine-Chlomal). • This 69kV system is part of the underlying lower voltage system in parallel with the bulk 500 kV lines between Lafayette and Lake Charles. • Lawtag to Jennings 69kV line overloads for the loss of 500kV line from Nelson to Richard and a couple of others lines in Entergy’s system. • Chlomal to Lacassine 69kV line overloads for the loss of 69kV line segments between Jennings and Elton. • For the loss of 500kV line Nelson to Richard, 69kV line from Welsh to Lawtag will overload. Recommended solution: Phase I (2008): • Upgrade 4.78 miles of 4/0 CU from Jennings to Lawtag with a conductor rated at least 106 MVA of capacity. • Install a 15 MVAr capacitor bank at Winn Substation. Phase II (2011): • Upgrade 12.36 miles of 1/0 ACSR from Chlomal to Lacassine with a conductor rated at least 69MVA of capacity. Install a circuit breaker at Lacassine. (breaker installation will depend on cost and benefits it provides) • Upgrade about 6 miles of 4/0 CU from Welsh to Lawtag with a conductor rated at least 69 MVA of capacity.

  5. Upgrade 69 kV line from Lawtag to Jennings Upgrade 69 kV line from Welsh to Lawtag Install a breaker at Lacassine Upgrade 69kV line from Chlomal to Lacassine Install 15 MVAr Capacitor at Winn

  6. Nesser Area Voltage Improvement Scenario: • Nesser is on a long radial tap on the Harelson-Jones Creek 69kV line. Nesser substation is experiencing rapid growth of over 6% per year. • For the loss of Harelson-Nesser tap, voltage at Nesser drops below acceptable level. Recommended Solution: • Build a new 69kV line from Jefferson to Nesser Substation. • Proposed In-Service Date: 2009 Estimated cost: $4.6 MM

  7. Nesser Area Voltage Improvement Build a new 69 kV line

  8. 69 kV McManus Capacitor Bank Expansion Scenario: • The 69 kV transmission system radiating north of Port Hudson substation serves 12 substations including McManus. • Loss of Port Hudson to Jackson 69kV line will cause low voltages at multiple substations. Recommended Solution: • The existing cap bank rating is 18 MVAR. Install additional cells adding up to 30 MVAR capacity. Remove fuses from a group of cells leaving sufficient number energized to provide only 24 MVAR output for now. As the need arises, install fuses on the remaining cells and restore the full capacity to 30 MVAR. Final cap bank size depends on load growth. • Proposed In-Service Date: 2008 Estimated cost: $230 k

  9. 69 kV McManus Capacitor Bank Expansion Expand 69 kV capacitor bank

  10. Lafayette Area Voltage Improvement Scenario: • Loss of 138kV line from Moril to Leblanc or Moril to Hopkins will cause low voltages at a couple of substations in Lafayette area. Recommended Solution: • Install two 36 MVAr cap banks at Leblanc. In addition, the existing 18MVAr cap bank at Meaux needs to be upgraded to 36MVAr. The normally-open switch at Lake Arthur needs to be closed after the completion of the Winn cap bank installation and upgrade of the 69kV line from Lawtag to Jennings. • Proposed In-Service Date: 2009 Estimated cost: $2.3MM

  11. Acadiana Area Voltage Improvement Install two 36MVAr cap banks at Leblanc Upgrade existing 18MVAr cap bank at Meaux to 36MVAr

  12. 138 kV Colonial Academy Capacitor Installation Scenario: • Loss of 138kV line from Richard to Colonial Academy will cause low voltages at Colonial Academy, Acadia, Scanlan and Scott. Recommended Solution: • Install a 36 MVAr capacitor bank at Colonial Academy or at Acadia substation for contingencies only. • Proposed In-Service Date: 2010 Estimated cost: $1 MM

  13. 138 kV Colonial Academy Capacitor Installation Install 138kV capacitor bank

  14. Alchem - Monochem: Upgrade 138 kV Line Scenario: • Alchem to Monochem 138kV line overloads for the loss of any segment of the 230kV line Vulchlor-Woodstock-Belle Helene-Licar-Polscar-Willow Glen. Recommended Solution: • Upgrade 6.76 miles of 336 ACSR line and bus at Alchem and Monochem with a conductor rated at least 380 MVA of capacity. • Proposed In-Service Date: 2010 Estimated cost: $4.5 MM

  15. Alchem - Monochem: Upgrade 138 kV Line Upgrade 138kV Line

  16. EGSI-LA Breaker Upgrades Scenario: • Based on symmetrical and asymmetrical fault current analysis, various circuit breakers have been identified as underrated. Recommended Solution: • Replace identified underrated circuit breakers with appropriately sized breakers. • Mossville 138kV # 17970 • Scott 138kV #’s 8820, 17100 & 8825 • Carlyss 69kV #’s 7840 & 8775 • Nelson 138kV # 7990 • Coly 69kV #’s 20375, 20365 & 20370 • Esso 230kV #’s 20075, 20080, 20085, 20090 • Nelson 230kV # 27105 • Scott 69kV #’s 8865, 8860 • Proposed In-Service Date: 2007/2008 Estimated cost: $2.5MM

  17. Target Areas Around Acadiana Area Beyond 2011 Champagne to Sunset line overloads FTLO Webre-Wells 500 kV line, lines crossing the Atchafalaya Basin overload Wells Richard-Colonial Academy-Scott line overloads Scott to Carencro Line Overloads . Scott Auto overloads FTLO either. Lafayette to Holiday line overloads Scott-Judice-Meaux Line Overloads Note: FTLO means “for the loss of”

  18. Target Areas Around Lake Charles Beyond 2011 L.C. Bulk auto overloads FTLO either Nelson-Mossville Line overloads Nelson-Moss Bluff 230kV line overload Upgrade L.C. Bulk to Chlomal Spot loading and load growth increasing on distribution level voltage

  19. Expand existing capacitor bank at Sarpent or Elton Jennings Auto overloads FTLO either Upgrade Chlomal-Iowa 69 kV line

  20. Target Areas Around Baton Rouge Beyond 2011 69 kV line Jackson to Marydale overloads Gloria-Harelson overloads, FTLO Coly-Denham Springs Coly-Denham Springs overloads, FTLO Gloria-Harelson