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Entergy Gulf States, Inc.(Louisiana)

Proposed Transmission Reliability Projects

Entergy Transmission Planning Summit

New Orleans, LA

July 31, 2007

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Proposed 2007-10 EGSI-LA Transmission Reliability Projects

• Port Hudson Bus Upgrade (2007)• McManus Capacitor Bank

Expansion (2008)

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 Nesser Sub:

Build a new 69kV line (2009)

138 kV Alchem-Monochem:Line Upgrade (2010)

Various Areas:• Circuit Breaker Upgrades

(2007 and beyond)

Acadiana Area Voltage Improvement (2009)

Colonial Academy Cap Bank Installation (2010)

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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.

Port Hudson : Bus/Switch Upgrade

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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.

Jefferson Davis: 69 kV System Improvement

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Install 15 MVAr Capacitor at Winn

Upgrade 69 kV linefrom Lawtag to Jennings

Install a breaker at Lacassine

Upgrade 69kV line fromChlomal to Lacassine

Upgrade 69 kV line fromWelsh to Lawtag

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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

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Nesser Area Voltage Improvement

Build a new 69 kV line

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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

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Expand 69 kV capacitor bank

69 kV McManus Capacitor Bank Expansion

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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

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Install two 36MVAr cap banks at Leblanc

Upgrade existing 18MVAr cap bank at Meaux to 36MVAr

Acadiana Area Voltage Improvement

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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

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Install 138kV capacitor bank

138 kV Colonial Academy Capacitor Installation

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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

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Upgrade 138kV Line

Alchem - Monochem: Upgrade 138 kV Line

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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

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Target Areas Around Acadiana Area Beyond 2011

Richard-Colonial Academy-Scott line overloads

FTLO Webre-Wells 500 kV line, lines crossing the Atchafalaya Basin overload

Wells

Scott-Judice-Meaux Line Overloads

Note: FTLO means “for the loss of”

Scott Auto overloads FTLO either.

Champagne to Sunset line overloads

Scott to Carencro Line Overloads.

Lafayette to Holiday line overloads

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Target Areas Around Lake Charles Beyond 2011

Nelson-Mossville Line overloads

Spot loading and load growth increasing on distribution level voltage

L.C. Bulk auto overloads FTLO either

Nelson-Moss Bluff 230kV line overload

Upgrade L.C. Bulk to Chlomal

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Upgrade Chlomal-Iowa 69 kV line

Expand existing capacitor bank at Sarpent or Elton

Jennings Auto overloads FTLO either

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Target Areas Around Baton Rouge Beyond 2011

Coly-Denham Springs overloads, FTLO Gloria-Harelson

Gloria-Harelson overloads, FTLO Coly-Denham Springs

69 kV line Jackson to Marydale overloads