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Entergy Louisiana, Inc.(South)

Proposed TransmissionReliability Projects

Entergy Transmission Planning Summit

New Orleans, LA

July 10, 2003

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2004 ELI-South Transmission Reliability Projects

Amite-Fernwood:Upgrade line

(2006 ISD)

Bogue Chitto: Build 500kVSS, tap Daniel-McKnightto Bogalusa (2006 ISD)

Coly-Hammond:Build 230kV line

(2006 ISD)

Improve ASI REVISED :Build lines -- Carryover

Phase I - Conway-Panama (2005 ISD)Phase II- Panama-Frisco (2006 ISD)

Hammond-Amite:Convert to 230kV

(2006 ISD)

Houma:Install Breakers

(2005 ISD)

NineMile:Replace Breakers

(2004 ISD)

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Amite South Area

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• The Amite South Import (ASI) has typically been approximately 2,100 MW during the summer operating season. When generation in the Amite South area is low, the Waterford–Willow Glen 500 kV line is usually the most severe contingency, thereby defining the ASI. The import calculation incorporates multiple operating guides, one of which assumes a potential increase (using Dynamic Line Rating (DLR) equipment) in the rating of the Conway–Bagatelle 230 kV line, under favorable system and weather conditions. Recent studies have shown that the Conway–Bagatelle line is the most limiting transmission line that establishes the ASI capability. The potential benefit from the use of DLR equipment on this line is no longer adequate to maintain ASI capability at appropriate levels.

• Recommended Solution: Build a new circuit from Conway to a new 230kV switching station (Panama) near Sunshine Substation. This circuit will be approximately 10 miles long and should be constructed using 1,780MCM ACSR conductor (1,605 Amps). The Panama switching station and a new line bay at Conway will have to be constructed.

• Estimated Total Cost: $13.4M ($1.59M for EGSI in 2004)

($8.66M for ELI in 2004)

2003-05

ASI Improvement Plan:Build Panama Switching Station &

Conway-Panama 230kV Line

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Panama

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Bogalusa-Daniel-McKnight:Build Bogue Chitto Switching Station & 500kV

Line• Power transfers from the Entergy system are limited by the flow on the Franklin to McKnight 500kV line flowgate. Loss of this line causes the underlying transmission system, particularly the Little Gypsy to Madisonville 230kV line, to become overloaded.

• Recommended Solution: Build a 500kV switching station on the Daniel-McKnight 500kV line south of Bogalusa. Build two circuits of approximately 11 miles each to a point on the Bogalusa- Franklin 500kV line. Reconnect the system with the following arrangement:

– Bogue Chitto - Daniel– Bogue Chitto - McKnight– Bogue Chitto - Bogalusa– Bogue Chitto - Franklin

This arrangement redirects approximately 620MW of flow off of Franklin- McKnight, which in turn lowers the post-contingency flow on Gypsy - Madisonville by approximately 200MW.

• Estimated Cost: $50.5M ($400,000 in 2003 for engineering expenditures)

($6.23M 2004 for ROW)

2003-06

Bogalusa

Daniel

Franklin

McKnight

Bogue Chitto

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Coly-Hammond:Build 230kV Line

• Entergy’s transmission system north of Lake Pontchartrain is primarily supported from the ELI 230kV system between Willow Glen and Waterford. Loss of the Franklin-McKnight 500kV line causes overloads 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: Build a 230kV line, approximately 24 miles, from Coly to Hammond.

• NOTE: This line cannot be connected until the Amite - Fernwood overload condition is resolved and until the Hammond-Amite line is converted.

• Estimated Cost: $19M– $400,000 in 2003 for engineering expenditures

– $2.1M ELI, $2.5M EGSI in 2004

2003-06

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COLY

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Amite(ELI)-Fernwood(EMI) Line:Upgrade 115kV Line

• The Amite to Fernwood 115kV line, located in south Louisiana, north of Lake Pontchartrain, extending north into southern Mississippi is 32 miles long. The section of line from Amite Substation to the Mississippi state line is approximately 17 miles and the section from the state line to Fernwood Substation is approximately 15 miles. This 115kV line, constructed with 4/0 ACSR conductor, is part of the Amite to McComb tie between ELI and EMI.

• Single contingencies in Mississippi of Brookhaven-Mallalieu or Mallalieu-Norfield in 2004 will cause overloads up to 27% on the Amite-Kentwood-Colonial Pipeline-Fernwood line segments.

• Recommended Solution: Rebuild the line with 1,272MCM ACSR conductor to obtain a line rating of 261 MVA.

NOTE: This project needs to be in place prior to the Hammond-Amite conversion and the Coly-Hammond 230kV line.

• Estimated Total Cost: $15M for ELI & EMI– $7.7M for ELI ($3.88M in 2004)

2004-06

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Hammond-Independence-Amite 115kV:Convert to 230kV

• The Hammond-Independence-Amite 115kV line, which is constructed for 230kV and operated at 115kV, is limited by the Hammond 230/115kV, 168MVA autotransformer and an 800Amp circuit breaker at Amite . This circuit overloads by 22% for a single contingency loss of Franklin-McKnight 500kV and by 18% for the loss of Bogalusa-Franklin 115kV line in 2004.

• Recommended Solution: Convert the Hammond-Independence-Amite 115kV line and the Independence 115kV substation to 230kV operation. Install a 230/115kV, 400MVA autotransformer at Amite and remove the autotransformer at Hammond.

• Estimated Cost: $7.4M ($150,000 in 2004)

2005-06

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Ninemile 230kV: Replace Circuit Breakers2004

• Mandatory: Safety - Replace 4 - 230 kV circuit breakers at

Ninemile Substation

• Total Cost: 2004 - $1.55 M

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Houma 115kV: Install 3 Breakers

• Houma Substation presently has a single 115 kV operating bus with no 115KV breakers. There has been frequent outages on the Chauvin – Houma – Ashland – Coteau 115kV line and the Houma – City of Houma 115KV line, causing this circuit to be one of ELI’s poorest performing lines.

• Recommended Solution: Install 3-115 kV breakers along with associated bus and switches at the Houma Substation.

• NOTE: Entergy has obtained a signed contract with City of Houma to pay 1/3 of the total project cost.

• Estimated Cost: $1.22M for ELI ($610,000 in 2004)

$610,000 for City of Houma

2004-05

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• The Amite South Import (ASI) has typically been approximately 2,100 MW during the summer operating season. When generation in the Amite South area is low, the Waterford–Willow Glen 500 kV line is usually the most severe contingency, thereby defining the ASI. The import calculation incorporates multiple operating guides, one of which assumes a potential increase (using Dynamic Line Rating (DLR) equipment) in the rating of the Conway–Bagatelle 230 kV line, under favorable system and weather conditions. Recent studies have shown that the Conway–Bagatelle line is the most limiting transmission line that establishes the ASI capability. The potential benefit from the use of DLR equipment on this line is no longer adequate to maintain ASI capability at appropriate levels.

• Recommended Solution: Build a new 230kV circuit from Panama to Frisco This circuit will be approximately 20 miles long and should be constructed using 1,780MCM ACSR conductor (1,605 Amps). The ring bus at Panama switching station will have to be completed and a new line bay at Frisco will have to be constructed.

• Estimated Total Cost: $14M ($1.5M 2004 for ROW)

2004-06

ASI Improvement Plan - Phase IIBuild Panama -Frisco 230kV Line

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Panama

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Amite-FernwoodCarryover (2005 ISD)

2005 - 2007 ELI-South Transmission Reliability Projects

Bogue Chitto: Build 500kVSS, tap Daniel-McKnightto Bogalusa Carryover (2006 ISD)

Improve ASI REVISED :Build lines -- CarryoverPhase II - Panama-Frisco (2006 ISD)

Coly-Hammond:Build 230kV lineCarryover (2006 ISD)

Hammond-Amite:Convert to 230kVCarryover (2006 ISD)

Houma: Install115kV BreakersCarryover (2006 ISD)

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2008 ELI Transmission Reliability Target Areas

Belle Chasse-Alliance:Build Switching Station & 115kV Line

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Questions