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Entergy Mississippi, Inc.

Proposed Transmission Reliability Projects

Transmission Planning Summit

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Grenada/Winona/Greenwood Area Improvement

2011

2008 - 2012 EMI Transmission Reliability Projects

Ridgeland - Madison Reliability Improvement

2012

Horn Lake – TH Allen 161kV Line Upgrade

2009

Ray Braswell – Byram 115kV Line

2011

Liberty – Gloster 115 kV2009

Natchez D-Var andCapacitor Banks

2008

Hollandale/Belzoni Breakers2011

Liberty – Gillsburg 115 kV2009

Indianola-Greenwood 115 kV2009

Rankin-Ind. – Airport 115 kV2009

3

Natchez SES:Install D-Var and Capacitor Bank

Scenario: • The Natchez area is served by five 115 kV lines out of Franklin,

Baxter Wilson, Liberty, Swartz, and Standard. The load in the area in 2009 will be 482 MW.

• The single contingency loss of any one of the five lines feeding into the area will cause low voltages at various substations.

Recommended Solution:• Install two 30 MVAr capacitor banks at Natchez SES and refurbish

and relocate two +/- 8MVAr D-VAR systems from Texas to Natchez SES.

• Estimated Cost: $8 MM

2008

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Natchez SVC and Capacitor Bank

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Liberty - Gillsburg 115 kV: Upgrade Capacity of Line

Scenario:• The Liberty - Gillsburg 115kV line, located in southern Mississippi, is

approximately 15 miles long and is limited to a rating of 69 MVA.

• The loss of the Franklin – Bogalusa EHV line will cause the line to overload.

Recommended Solution: • Re-conductor the Liberty – Gillsburg line and increase the rating of

the line to 103 MVA.

• Estimated Cost: $7 MM

2009

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Liberty - Gillsburg 115 kV: Upgrade capacity of line

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Liberty - Gloster 115 kV: Upgrade Capacity of Line

Scenario:• The Liberty - Gloster 115kV line, located in southern Mississippi, is

20 miles long and is limited to a rating of 108 MVA.

• The loss of the Franklin – Meadville 115 kV line or the S. Vicksburg – Port Gibson 115 kV line will cause the line to overload.

Recommended Solution: • Re-conductor the Liberty – Gloster line and increase the rating of

the line to 190 MVA.

• Estimated Cost: $4.4 MM

2009

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Liberty - Gloster 115 kV: Upgrade capacity of line

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Indianola - Greenwood Line Upgrade

Scenario:• The Indianola - Greenwood 115kV line, located in central

Mississippi, is 28 miles long and is limited to a rating of 120 MVA by equipment in the Moorhead, Itta Bena, and Greenwood substations.

• The loss of the several lines in the area including Pickens - Durant 115kV and Delta - Ruleville 115kV will cause the line to overload.

Recommended Solution: • Replace the affected substation equipment and increase the rating

of the line to 161 MVA.

• Estimated Cost: $250 K

2009

10

Indianola - Greenwood Line Upgrade

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Horn Lake:Energize 230/161kV Autotransformer & Upgrade

Horn Lake – Allen (TVA) 161kV LineScenario: • The load in the Southaven and Senatobia areas, served by one 230

kV line and two 115 kV lines, will total approximately 406 MW in 2009.

• The single contingency loss of the Freeport – Horn Lake 230kV line will cause low voltages at 9 substations.

Recommended Solution:• Reconductor the Horn Lake – TH Allen (TVA) 161kV line to a rating of

at least 390 MVA and energize the idle 230/161kV autotransformer at Horn Lake.

• Estimated Cost: $3.5 MM

2009

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HornLake 230/161kV Auto & Allen Line Upgrade

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Rankin Ind. - Airport Reconductor

Scenario:• The Rankin Ind. - Airport 115kV line, located in near Jackson

Mississippi, is 5.5 miles long and is limited to a rating of 161 MVA.

• The loss of the 230/115kV autotransformer at Rankin will cause the line to overload.

Recommended Solution: • Re-conductor the Rankin Ind. - Airport 115kV line and increase the

rating of the line to 231 MVA.

• Estimated Cost: $3 MM

2011

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Rankin Ind. - Airport Reconductor

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Ridgeland-Madison Reliability Improvement

Scenario: • The Lakeover -NE Jackson - Rex Brown 115 kV line is 25 miles long and will

serve 6 substations totaling 194 MW in 2009.

• The loss of the Rex Brown - Hico, Hico - N. Jackson or N. Jackson - Canton Rd 115 kV lines in 2008 causes overloads on the Lakeover - Livingston Rd 115 kV line. The loss of the Lakeover - Livingston Rd or Livingston Rd - Ridgeland 115kV lines causes the Rex Brown - Hico - N. Jackson 115kV lines to overload.

Recommended Solution:• Build a 115kV substation in the existing Northpark 230kV substation and

cut in the Lakeover-NE Jackson line at Northpark (between Ridgeland and Country Club). Double-Circuit the existing Lakeover–Livingston–Ridgeland 115 kV line, upgrading the existing line to at least 231 MVA, and connect the new circuit to the new 115kV bus at the Northpark substation. This new circuit will be used for the feed to the new Sunnybrook substation.

• Estimated Cost: $13 MM

2012

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Sunnybrook

Northpark 115

Ridgeland-Madison Reliability Improvement

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Ray Braswell – Byram 115 kV LineConstruction

Scenario: • The SW Jackson to Byram to Brookhaven line is 53 miles long and

serves 162 MW of load. • The loss of the SW Jackson to Elton or Elton to Byram 115 kV lines

will cause overloads on three line sections from Brookhaven to Hazlehurst 115 kV and undervoltages on various buses in 2008.

• In addition, the loss of Brookhaven - Wesson or Wesson - James Rd. will cause overloads on two line sections from SW Jackson to Byram.

Recommended Solution: • Build a new 115 kV line from Ray Braswell to Byram 115 kV

substation with a rating of at least 261 MVA.

• Estimated Cost: $23 MM

2011

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Ray Braswell – Byram 115 kV Line Construction

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Hollandale - Belzoni Breakers

Scenario: • The N.Vicksburg - Rolling Fork - Greenville line is 81 miles long and

will serve 109 MW of load in 2009. The Indianola - Yazoo City line is 51 miles long and will serve 35 MW. When either end of the N.Vicksburg - Rolling Fork - Greenville line is open, the buses along the line have low voltages, and when the North end of the Indianola - Yazoo City line is open, Inverness, Isola, and Belzoni substation have low voltages.

Recommended Solution:• Install breakers at Hollandale and near the Belzoni SS / Midnight

substation to close the normally open section between Belzoni SS and Murphy. Install a 21.4 MVAR capacitor bank at the Rolling Fork Substation.

• Estimated Cost: $4 MM

2011

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Hollandale - Belzoni Breakers

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Tillatoba - South Grenada:Build New 230 kV Line and

Install 230/115 Auto at S. Grenada

Scenario:• The Greenwood, Winona, and Grenada area is supplied by five

115kV lines and will serve 390 MW in 2009. • The loss of one of these five 115 kV lines or the loss of the Tillatoba

230/115kV auto will cause various bus undervoltages and overloads on 2 115kV lines.

Recommended Solution:• Build a 230kV line from Tillatoba to S. Grenada and install a

230/115kV autotransformer at S. Grenada. Install a capacitor bank at Schlater (21 MVAR), an additional bank at Winona (21 MVAR) and upgrade the bank at Greenwood (32 MVAR)

Estimated Cost: $45 MM

2011

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Tillatoba - S. Grenada: Build New 230 kV Line & South Grenada Auto

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EMI Transmission System Target Areas 2013 and Beyond

Southhaven Area•Build 2 New 230 kV lines

Franklin Area•New 230kV Substation•Build 2 New 230kV Lines

Madison/N. Jackson Area•Lakeover-Pickens 230 kV line•Northpark 230/115kV Auto