Entergy Louisiana, LLC (South)

1
Entergy Louisiana, LLC (South) Entergy New
Orleans, Inc.Proposed TransmissionReliability
Projects

• Entergy Transmission Planning Summit
• New Orleans, LA
• July 29, 2008

2
ELL-South/ENOI Transmission Reliability Projects
Loblolly-Hammond Build 230kV line
DSG Phase III (Postponed)

• Paterson
• Restore 4 breakers

SELA Phase 3 Oakville-Alliance Build 230kV line
Auto
Improve ASI Capability
Phase II- Panama-Dutch Bayou Phase III-
Coly-Vignes Conway-Bagatelle
SELA Phase 2 Peters Rd-Oakville Build 230kV
line Station
Houma Install Cap Bank
ELL-South
3
PatersonRestore 4 Breakers

• Scenario
• Paterson substation was flooded during Hurricane
  Katrina resulting in all major transmission
  equipment being damaged. Prior to Katrina,
  Paterson 115kV bus terminated four 115kv
  transmission lines and operated as a hub for the
  transmission system in the New Orleans area.
  Presently, the Paterson 115kV bus has been
  temporarily restored to operate in a split, east
  / west bus configuration. The east bus is in
  series with the Chalmette 115kV and the Sherwood
  Forest 115kV substations.
• The west bus is in series with the Claiborne
  115kV and the Pontchartrain Park 115kV
  substations. Various single contingencies in the
  New Orleans area now could result in overloads on
  portions of this west bus circuit.
• Recommended Solution
• Re-build the Paterson 115kV substation to
  terminate four 115kV transmission lines from
  Pontchartrain Park, Sherwood Forest, Chalmette
  and Claiborne. The bus configuration should be
  configured in a double bus with shared breaker
  configuration (breaker and a 1/2). This
  arrangement will allow for station expansion,
  including power transformer additions and
  potentially the addition of a 230/115kV auto
  transformer as system conditions dictate.
• Proposed In-Service Date 2008
• Estimated Cost 3 MM

ENOI
4
Paterson Restore 4 Circuit Breakers
Restore Breakers
5
HoumaInstall Capacitor Bank

• Scenario
• This project was identified as required as part
  of a transmission service request
• Recommended Solution
• Install a 40MVAr capacitor bank at Houma 115kV
  substation.
• Proposed In-Service Date 2008
• Estimated Cost 850 k

ELL-South
6
HoumaInstall Capacitor Bank
Install Cap Bank
7
Loblolly-HammondConstruct 230 kV Substation and
Line

• Scenario
• Entergys transmission system north of Lake
  Pontchartrain is primarily supported from the ELL
  230kV system between Willow Glen and Waterford.
• Loss of the Franklin-McKnight 500kV line, or
  certain other transmission contingencies, result
  in overloads to occur on the underlying
  transmission system, primarily on the
  Gypsy-Madisonville 230kV line.
• Adding another 230kV source from a location north
  of Willow Glen reduces loading on the existing
  system and improves load serving capability north
  of Lake Pontchartrain and into south Mississippi.
• Recommended Solution
• Construct 230 kV line from Loblolly to Hammond
  using existing ColyHammond 69 kV line
  (constructed for 230kV).
• Proposed In-Service Date 2012
• Estimated Cost 75 MM

ELL-South
8
Loblolly-Hammond Build 230 kV Line
To Franklin
To Fancy Point
McKnight
To SOCOs Plant Daniel
To Coly
Construct new 230kV line
Coly
Loblolly
ELL-South / EGSI-LA
9
ASI Improvement Plan - Phases 2 3

• Scenario
• When generation in the Amite South area is low,
  loss of the WaterfordWillow Glen 500 kV line is
  the most severe contingency that establishes the
  Amite South Import (ASI) capability.
• The ASI capability improved to approximately
  2,450 MW upon completion of Phase 1 of the ASI
  Improvement Plan (Conway-Panama) in 2005.
• Phase 2 (Panama-Dutch Bayou) and Phase 3
  (Coly-Vignes, Conway-Bagatelle) were expected to
  provide economic benefits and were to be
  completed by 2007 prior to Hurricane Katrina.
• Post Hurricane Katrina and the subsequent loss of
  load within southeast LA, Phases 2 and 3 were
  determined to be needed for reliability by 2015
  or by 2010 for economics.
• Based on the 2006 Transmission Study, Entergy
  determined that accelerating Phases 2 3 could
  yield economic benefits sufficient enough to
  advance the in-service dates to earlier than
  2010.
• Recommended Solution
• Construction of Phases 2 3.
• Proposed In-Service Date 2009 (Phases 2 3)
• Estimated Project Costs
• Phase 2 38 MM
• Phase 3 20 MM

ELL-South / EGSI-LA
10
ASI Improvement Plan - Phase 2
Build 230kV line
ELL-South
11
ASI Improvement Plan - Phase 3
Upgrade 230kV line
Upgrade 230kV line
ELL-South / EGSI-LA
12
Southeast Louisiana Coastal Improvement
Plan Construct New Peters Road-Oakville-Alliance
230 kV Line

• Scenario
• The primary transmission sources to lower
  Lafourche, Lower Jefferson, and Plaquemines
  Parishes are the Ninemile and Valentine
  substations. Although lower Plaquemines Parish
  experienced heavy damage during Hurricane
  Katrina, it is expected that oil refining and
  pumping facilities in the area will be restored.
• Additionally, upper Plaquemines Parish, including
  Belle Chasse and the Naval Air Support facility,
  is experiencing growth.
• For the contingency loss of the
  Ninemile-Barataria 115kV or the
  Valentine-Clovelly 115kV lines, potential low
  voltages and line overloads exists.
• Recommended Solution
• Peters Road-Oakville 230kV
• Build a new 230kV substation at Oakville and a
  new radial 230kV line from Peters Road to
  Oakville Substation.
• Proposed In-Service Date 2010
• Estimated Cost 21.3 MM
• Oakville-Alliance 230 kV
• Construct a new 230kV transmission line from
  Oakville substation to Alliance substation. Add a
  150MVA 230/115kV auto at Alliance substation.
  This project also provides support for the
  Fourchon area.
• Proposed In-Service Date 2010
• Estimated Cost 35 MM

ELL-South
13
Peters Road-Oakville 230kV Build new line and
substation Oakville-Alliance 230 kV Build new
line
Build 230kV Line Sub
Build 230kV Line Auto
Build 230kV Line Auto
ELL-South
14
ELL-South and ENOI Identified Target Areas
Beyond 2011
Paterson Install 230/115kV auto
Belle Point Little Gypsy Reconductor 230kV Line
DSG Phase III
Napoleonville Add capacitor bank