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Entergy Gulf States Louisiana, L.L.C. Proposed Transmission Reliability Projects

Entergy Gulf States Louisiana, L.L.C. Proposed Transmission Reliability Projects. Proposed 2009-11 Entergy Gulf States Louisiana, L.L.C. (EGSL) Transmission Reliability Projects. Acadia Cap Bank Installation. Jefferson Davis Area 69 kV Improvements. Nesser Sub: Build a new 69kV line.

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Entergy Gulf States Louisiana, L.L.C. Proposed Transmission Reliability Projects

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  1. Entergy Gulf States Louisiana, L.L.C.Proposed Transmission Reliability Projects

  2. Proposed 2009-11 Entergy Gulf States Louisiana, L.L.C. (EGSL) Transmission Reliability Projects Acadia Cap Bank Installation • Jefferson Davis Area 69 kV Improvements Nesser Sub: Build a new 69kV line • Upgrade Lafayette to Holiday • to Billeaud 69 kV line Acadiana Long Term Reliability and Economic Improvements 138 kV Alchem-Monochem: Line Upgrade

  3. Jefferson Davis: 69 kV Area Improvements Scenario: Approximately 90 MW of local area load is sourced by the 69kV transmission system between Jennings and Chlomal (including the radial load to the south of Lawtag. The primary "trunks" of the system are the Jennings-Compton-Elton-Tupper-Serpent-Chlomal 69 kV line and the Chlomal-Iowa-Welsh-Lawtag-Jennings 69 kV line. • The contingency outage of a 69kV line segment between Jennings and Elton results in the Chlomal to Lacassine 69kV line to exceed its thermal rating. Likewise, the contingency outage of a 69 kV segment between Chlomal and Carter results in the Jennings to Compton 69 kV line to exceed its thermal rating. • The contingency outage of the Lawtag to Jennings 69 kV line results in the Lake Charles Bulk to Chlomal 69 kV line and the Chlomal to Iowa 69 kV line segment to exceed their thermal rating. • The contingency outage of the Goosport to LC Bulk 69 kV line results in the Lake Charles Bulk to Chlomal 69 kV line to exceed its thermal rating. • Loss of either of the Lake Charles Bulk 138 - 69kV autotransformers results in the remaing autotransformer to exceed its thermal rating. Recommended solution: • Install a 14.4 MVAr capacitor bank at Winn Substation. Proposed ISD: 2008 • Create normally open point at Serpent and Lawtag. Proposed ISD: 2010 • Install capacitor banks at Carter and Elton. ISD: 2010 • Upgrade approximately 4.8 miles Jennings to Lawtag 69 kV line to a capacity of 106 MVA . Proposed ISD: 2010 • Either upgrade both 138 - 69 kV autotransformers or add a 3rd autotransformer at Lake Charles Bulk. Proposed ISD: 2011 • Upgrade the approximately 3 mile Lake Charles Bulk to Chlomal 69 kV line. Proposed ISD: 2011 Note: Creation of normally open points at Serpent and Lawtag provides the system the flexibility eliminate contingency loop flows as a seasonal / temporary solution.

  4. NOP at Serpent 14.4MVAr Cap Bank at Elton 14.4MVAr Cap Bank at Carter Upgrade Lawtag to Jennings NOP at Lawtag 14.4MVAr Cap Bank at Winn

  5. Upgrade 138/69 Autotransformers or add 3rd Upgrade LC Bulk to Chlomal

  6. Nesser Area Voltage Improvement Scenario: • The Nesser substation is sourced by a long radial tap off of the Harelson-Jones Creek 69kV line. Nesser substation is experiencing rapid load growth of over 6% per year. • For the contingency loss of the Harelson-Nesser tap, voltage violations at Nesser will occur. Recommended Solution: • Construct a new 69kV line from Jefferson to the Nesser Substation. • Proposed In-Service Date: 2009 Estimated cost: $13MM

  7. Nesser Area Voltage Improvement Construct new 69 kV line

  8. Upgrade Lafayette-Holiday- Billeaud 69 kV line Scenario: • The need to upgrade of this line was identified as part of an Affected System Study. • The Lafayette-Holiday-Billeaud line is currently rated at 39 MVA. • Loss of the CLECO Flanders to Hopkins 138 kV line, Moril 138/69 kV auto, or the Moril to New Iberia 69 kV will result in the line to exceed its thermal rating. Recommended Solution: • Upgrade the approximately 5.3 mile Lafayette to Holiday 69 kV line with 336 ACSR • Upgrade the approximately 4.1 mile Holiday to Billeaud 69 kV line with 336 ACSR • Proposed In-Service Date: 2009 Estimated cost: $ 8 MM

  9. Upgrade Lafayette-Holiday- Billeaud 69 kV line

  10. 138 kV Acadia Capacitor Bank Installation Scenario: • The contingency loss of the 138kV line from Richard to Colonial Academy will result in low voltages at Colonial Academy, Acadia, Scanlan and Scott substations. Recommended Solution: • Install a 138 kV, 36 MVAR capacitor bank at the Acadia substation. • Proposed In-Service Date: 2010 Estimated cost: $1MM

  11. 138 kV Colonial Academy Capacitor Installation Install 36 MVAR Cap Bank

  12. Alchem - Monochem: Upgrade 138 kV Line Scenario: • In the industrial corridor, the Alchem to Monochem 138kV line is part of a 138 kV path that operates parallel to Willow Glenn to Conway 230 kV line. • The contingency loss any of the 230 kV segments from Willow Glen to Vulchlor will result in the Alchem to Monochem 138 kV line to exceed its thermal rating. Recommended Solution: • Upgrade approximately 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: $7.5 MM

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

  14. Acadiana Area Improvement Project • Includes a set of reliability and economic projects based on a joint study performed by Entergy, CLECO, LUS, and the ICT. • Potential projects include new 230 kV sources from Richard and Wells down to the Meaux and Moril areas along with a second Labbe to Bonin 230 kV line. • Area transmission owners are currently in the process of finalizing the required set of projects.

  15. Identified Target Areas Around Lake Charles 2012 and Beyond Lake Charles Improvement 230 kV Loop Nelson-Moss Bluff 230kV line overload Nelson-Mossville Line overload Chlomal-Lacassine: Upgrade 69kV line Spot loading and load growth increasing on distribution level voltage Solac auto overloads FTLO either

  16. Jennings Auto overloads FTLO either Upgrade Chlomal-Iowa 69 kV line

  17. Identified Target Areas Around Acadiana Area 2012 and Beyond Champagne to Sunset line overloads Wells FTLO Webre-Wells 500 kV line, lines crossing the Atchafalaya Basin overload Scott Auto overloads FTLO either. Scott to Carencro Line Overloads . Note: FTLO means “for the loss of”

  18. Identified Target Areas Around Baton Rouge 2012 and Beyond McManus to Brady Heights - Upgrade Jackson to Tejas to Marydale-Upgrade Gloria-Harelson-Upgrade Coly-Denham Springs-Upgrade Greenwell Spr. Area Reconfiguration Port Hudson - 69 kV area improvement

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