entergy arkansas, inc. proposed transmission projects

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Entergy Arkansas, Inc.

Proposed TransmissionProjects

Entergy Transmission Planning Summit

New Orleans, LA

August 11, 2009

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2009 EAI Transmission Projects

1) Gillette: Install 10.8 MVAR Capacitor Bank

2) Donaghey to Conway South: Upgrade Line

3) Hamlet: Install Breaker on Conway Industrial Line

4) Danville: Upgrade Terminal Equipment

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2010-2012 EAI Transmission Projects

1) Osage Creek – Grandview: New Line

2) Transmission Service - OG&E

3) Holland Bottoms: Construct 500/161/115 kV Substation

4) Transmission Service - Aquila

5) Warren East: Install 10.8 MVAR Capacitor Bank

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6) Transmission Service – SMEPA

7) Melbourne to Sage 161kV: Upgrade Line

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2010-2012 EAI Transmission Projects

1) Harrison to Everton Road: Replace Switches and Line Trap

2) Transmission Service – Westar

3) Jonesboro to Hergett: Upgrade 161kV Line

4) Ebony Switching Station: Convert to a Breaker Station

5) Beebe: Install 21.6 MVAR Capacitor Bank

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6) Holland Bottoms to Hamlet: Construct New 161 kV Line

7) Benton North to Benton South: Construct New 115 kV Line

8) Mt Ida: Install 10.8 MVAR Capacitor Bank

9) Sarepta: Emerson Install a 10.8 MVAR Capacitor Bank

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Gillette: Install 10.8 MVAR Capacitor Bank

Scenario:

• Loss of the Helena Industrial - Ritchie SES 115 kV line segment causes low voltages at various substations

• Loss of the Stuttgart Ricusky 230/115 kV autotransformer causes low voltages at various substations and overloads on the Woodward – Altheimer and the Altheimer – Wabbaseka 115 kV line segments

Proposed Solution:

• Install a 10.8 MVAR capacitor bank at Gillette.

• Correct Distribution power factor at Dewitt, Almyra, Marvell, Gillett, Helena Central, and Ulm substations.

Proposed In Service Date: Summer 2009

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Gillette: Install 10.8 MVAR Capacitor Bank

Gillette: Install 10.8 MVAR Capacitor

Bank

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Donaghey to Conway South: Upgrade Line& Hamlet: Install Breaker on Conway Industrial

LineScenario:• Loss of the Helena Industrial - Ritchie SES 115 kV line segment

causes low voltages at various substations• Loss of the Pleasant Hill - Quitman 161 kV line segment causes an

overload on the Conway West to Donaghey and Donaghey to Conway South 161kV transmission line sections. The Conway West - Donaghey line has been upgraded.

• The Pleasant Hill – Quitman line and the Morrilton East to Quitman line are subjected to unanticipated transactions which tend to overload the Morrilton East to Quitman line for the loss of the Pleasant Hill to Quitman line.

Proposed Solution:• Re-conductor Donaghey – Conway South• Install a breaker at Hamlet Switching Station to remove the

overloads caused by the loss of Pleasant Hill – Quitman. This is an interim measure until a line can be constructed from Holland Bottoms to Hamlet in 2012.

Proposed In Service Date: Winter 2009

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Donaghey to Conway South: Upgrade Line& Hamlet: Install Breaker on Conway Industrial

Line

Donaghey to Conway South: Upgrade Line

Hamlet: Install Breaker on Conway

Industrial Line

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Danville: Upgrade Terminal Equipment

Scenario:

• Loss of ANO - Fort Smith 500kV Transmission line causes overloads on the Danville-Magazine, and Magazine-North Magazine line sections.

• The loss of the 500 kV line causes the flow to utilize the underlying network to transfer power to the neighboring utilities.

Proposed Solution:

• Upgrade Danville bus section, switches and line trap.

• Danville to North Magazine re-conductor. This has been completed.

Proposed In Service Date: Fall 2009

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Danville: Upgrade Terminal Equipment

Danville: Upgrade Substation Equipment

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Osage Creek – Grandview: New Line

Scenario:

• By 2010 it is estimated that approximately 227 MW of load will be served between Harrison East and Eureka Springs.

• Loss of the Harrison East – Harrison South transmission line segment causes thermal overloads by as much as 7% on the Eureka – Osage Creek (AECC) line segment.

• Loss of this line also causes depressed voltage at key load centers.

Proposed Solution:

• Construct a new switching station, Grandview, on the transmission line from Table Rock Dam – Eureka Springs. Build a new line between Grandview and Osage Creek.

Proposed In Service Date: 2011

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Osage Creek – Grandview: New Line

Grandview 161 kV Substation

Grandview – Osage Creek 161 kV Line: Construct

New Line

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Supplemental Upgrades - OG&E

Scenario:

• Supplemental upgrades for OG&E

Proposed Solution:

• ANO - Russellville N 161 kV: Line Upgrade

• Russellville E - Russellville S 161 kV: Line Upgrade

• ANO EHV Substation: Upgrade Switch

• Russellville N 161 kV Substation: Upgrade Switch

• Russellville E 161 kV Substation: Upgrade Switch

• Russellville S 161 kV Substation: Upgrade Switch


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Supplemental Upgrades - OG&E

Re-Conductor the 161 kV Transmission Line from

ANO to Russellville North


Russellville East to Russellville South

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Holland Bottoms: Construct 500/161/115 kV Substation

Scenario:

• For the past two summers, several stations in Little Rock observed voltages as low as 91% of nominal with no significant contingencies.

• The loss of one of the 500/115 kV transformers at Mabelvale in 2006 resulted in low voltages in the Little Rock area during periods where heavy flows to the north were occurring.

• A loss of the second transformer at Mabelvale (N-2) could result in widespread low voltage in the Little Rock area.

Proposed Solution:

• Construct a 500/115kV substation near Cabot Northeast of Little Rock. This will provide voltage support to Little Rock and reduce some thermal contingencies.


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Holland Bottoms: Construct 500/161/115 kV Substation

Holland Bottoms 500/161/115 kV

Substation

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Transmission Service - Aquila

Scenario:

• Aquila Transmission Service (Base Funded)

Proposed Solution:

• Project definitions will be completed for the following Base Plan Projects:

• Hot Springs EHV to Bismarck 161kV T-line upgrade• Bismarck to AECC Alpine 161 kV T-line Upgrade• AECC Alpine to Amity Tap 161 kV T-line Upgrade• Bismarck Substation Upgrades


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Transmission Service - Aquila

Re-Conductor the 115 kV Transmission Line from AECC Alpine to

Amity SS

Re-Conductor the 115 kV Transmission Line from Hot Springs EHV

to Bismarck

Re-Conductor the 115 kV Transmission Line

from Bismarck to AECC Alpine

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Warren East: Install 10.8 MVAR Capacitor Bank

Scenario:

• The Warren East is a substation which is located in southeastern Arkansas, northeast of El Dorado. This is a long radial line fed from Monticello East and El Dorado EHV which is approximately 61 miles. Loss of any of the line segment along this line causes voltages to dip below 90%. Also, voltages in this area drop during the loss of the 500/115 kV at El Dorado EHV.

Proposed Solution:

• Install a 10.8 MVAR capacitor bank to the operating bus at the Warren East substation.


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Warren East: Install 10.8 MVAR Capacitor Bank

Warren East: Install 10.8 MVAR Capacitor

Bank

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Transmission Service - SMEPA

Scenario:

• SMEPA transmission service (Base Funded).

Proposed Solution:

• Upgrades required for transmission service:– Re-conductor Dell to AECC Manila 161 kV Transmission Line

– Re-conductor AECC Manila to Monette 161 kV Transmission Line

– Re-conductor Jonesboro North to Paragould South 161 kV Transmission Line

– Re-Conductor Jonesboro to Jonesboro North 161 kV Transmission Line


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Transmission Service - SMEPA


from Dell to AECC Manila

Re-Conductor the 161 kV Transmission Line from AECC Manila to

Monette

Re-Conductor the 161 kV Transmission Line from Jonesboro North

to Paragould South


from Jonesboro to Jonesboro North

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Melbourne to Sage 161kV: Upgrade Line

Scenario:

• The following contingencies cause the Melbourne to Sage 161kV line segment to overload in the Winter 2010 Planning Models:

• Loss of ANO to Fort Smith 500kV• Loss of ISES to Dell 500kV• Newport to Jonesboro 161kV

Proposed Solution:

• Re-conductor the Melbourne to Sage 161kV Transmission line segment to a minimum of 1200 Amps.


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Melbourne to Sage 161kV: Upgrade Line


from Melbourne to Sage

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Harrison East to Everton Road:Replace Switches and Line Trap

Scenario:

• Harrison East to Hilltop has a limited of 167 MVA due to breaker B4836 switches at Harrison East and the line trap at Harrison East. The switches are currently rated at 600 Amps and the line trap is rated for 600 Amps. BY upgrading the switches and line trap the line rating will increase from 167 MVA to 223 MVA.

Proposed Solution:

• Install 2 sets of switches at Harrison East on breaker B4836. The new switches need to be rated no less than 1200 Amps.

• Install a new line trap at Harrison East with a rating no less than 1200 Amps.


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Harrison to Everton Road: Replace Switches and Line Trap

Harrison East: Replace switches and line trap on the

Everton Road 161 kV Transmission Line

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Transmission Service - Westar

Scenario:

• Transmission Service

Proposed Solution:

• Re-conductor the Monette to Paragould 161 kV (Base Funding) Transmission line segment to at least 246 MVA.

• Upgrade the switch B6673 at Paragould substation from 600 A to 2000 A

• Russellville South 161 kV Substation – Upgrade Dardanelle Dam Line Terminal Equipment (Supplemental Funding) – Proposed upgrade to 416 MVA rating


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Transmission Service - Westar


from Paragould to Monette

Upgrade Switch B6673


Russellville South to Dardanelle Dam

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Jonesboro to Hergett: Upgrade 161 kV Line

Scenario:

• The loss of Jonesboro to Jonesboro SPA causes the Jonesboro to Hergett 161 kV Transmission Line segment to overload. Also the loss of the Marked Tree to Harrisburg Tap 161 kV Transmission Line segment causes the Jonesboro to Hergett 161 kV Transmission Line segment to overload.

Proposed Solution:

• Re-conductor the Jonesboro to Hergett 161 kV Transmission line segment to at least 240 MVA.


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Jonesboro to Hergett: Upgrade 161 kV Line


from Jonesboro to Hergett

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Ebony Switching Station: Convert to a Breaker Station

Scenario:

• The loss of West Memphis EHV to West Memphis Polk causes low voltages at WM Polk and WM Lehi. To prevent this, Ebony SS will be converted to a breaker station.

• Ebony SS ties together Kuhn Road, WM Gateway, Marked Tree, WM Lehi and WM Polk. The current configuration has Marked Tree to WM Lehi bypassing the switching station. This also prevents a creation of an operational guide for the TOC to remove the low voltages condition if an event should occur.

Proposed Solution:

• Convert Ebony SS to a 5 breaker station (Single Bus Single Breaker Scheme). Additional land may need to be purchased.


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Ebony Switching Station: Convert to a Breaker Station

Ebony SS: Convert Ebony SS to a Ring

Bus

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Beebe: Install 21.6 MVAR Capacitor Bank

Scenario:

• The loss of the Cabot to Ward 115 kV Transmission line segment causes low voltages along line 937. Line 937 breaker to breaker is from Jacksonville North to Searcy Price. Since there is a capacitor bank at Cabot, the loss of Jacksonville to Cabot is not as severe. The Cabot capacitor bank is 32.4 MVAR (30.53 MVAR at 115 kV).

Proposed Solution:

• Install a 21.6 MVAR, 115 kV capacitor bank at Beebe Substation.


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Beebe: Install 21.6 MVAR Capacitor Bank

Beebe: Install 21.6 MVAR Capacitor

Bank

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Holland Bottoms - Hamlet: Construct New 161 kV Line

Scenario:

• The loss of the 161 kV transmission line from Pleasant Hill to Quitman causes an overload on the Conway West to Donaghey and Donaghey to Conway South 161 kV transmission line sections. There are two 161 kV transmission lines that push power to North/Northwest Arkansas due to daily and long term/firm transactions. One of the lines runs through the City of Conway (Morrilton East to Quitman) and the other is north of Conway (Pleasant Hill to Quitman). When the Pleasant Hill to Quitman line trips the Morrilton to Conway West to Quitman line now has to handle not only the load in the Conway area but the transactions flowing North.

Proposed Solution:

• Convert Hamlet SS to a breaker station (Single Bus Single Breaker Scheme)

• Move the Quitman line from Gold Creek to Hamlet SS• Move the Gravel Ridge line from Gold Creek to Hamlet SS• Construct a line from Hamlet SS to Holland Bottoms with a rating no

less than 1200 AmpsProposed In Service Date: 2012

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Holland Bottoms to Hamlet: Construct New 161 kV Line

Holland Bottoms

Hamlet: Convert to a breaker station

Construct a new 161 kV Transmission Line from

Holland Bottoms to Hamlet

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Benton North - Benton South:Construct New 115 kV Line

Scenario:

• The loss of Mabelvale to Bryant 115kV Transmission Line segment causes on overload on the Hot Springs EHV to Butterfield line section and low voltages at Benton South, Bryant and Alcoa Road substations.

Proposed Solution:

• Convert Benton South SS to a breaker stations (Single Bus Single Breaker Scheme)

• Convert Benton North SS to a breaker stations (Single Bus Single Breaker Scheme)

• Construct a line from Benton South to Benton North• The new line needs to be rated to at least 170 MVA


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Benton North to Benton South:Construct New 115 kV Line

Benton North SS: Convert to a breaker

station

Benton South SS: Convert to a breaker

station

Construct a new 115 kV Transmission Line from Benton North to

Benton South

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Mt Ida: Install 10.8 MVAR Capacitor Bank

Scenario:

• The loss of Hot Springs to Bismarck 115 kV Transmission line segment causes low voltages along the Hot Springs EHV to Murfreesboro 115 kV Transmission Line. The source from the South, SWEPCO's area, is not strong enough to support the load on this line.

Proposed Solution:

• Install a 10.8 MVAR Capacitor Bank at Mt Ida Substation.


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Mt Ida: Install 10.8 MVAR Capacitor Bank

Mt Ida: Install 10.8 MVAR Capacitor

Bank

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Sarepta: Emerson Install a 10.8 MVAR Capacitor Bank

Scenario:

• With the forecasted 2008 summer peak load model, a single contingency analysis was performed in the ELL-North-West area with and without the potential load additional of 28 MW at the new substation close to Arcadia.

Proposed Solution:

• Install a 345/115kV Auto at the Serepta 115 kV substation• Install a 10.8 MVAR capacitor bank at Emerson• Install a 32.4 MVAR cap bank at Lucky• Install a 32.4 MVAR cap bank at Vienna


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Sarepta: Emerson Install a 10.8 MVAR Capacitor Bank

Emerson: Install 10.8 MVAR Capacitor

Bank

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Transmission System Target Areas 2013 and Beyond

1) Little Rock Re-Conductor 115 kV Transmission Lines

2) Norfork – Sage: Upgrade 161 kV Line

3) Bull Shoals to Midway: Upgrade 161 kV Line

4) Gum Springs: Construct Switching Station

5) Gum Springs to Amity: Construct 115 kV Line

6) Holland Bottoms to Ward: Construct 2nd 115 kV Line

7) Jim Hill to Datto: Convert 115 kV Line to 161 kV Or Construct a New 161 kV Line

8) Jonesboro: Construct a 500/161 kV Substation

9) Lake Village Bagby to Macon Lake: Upgrade 115 kV Line

10) Mayflower to Morgan: Upgrade 115 kV Line

11) Russellville East to Russellville North: Upgrade 161 kV Line

12) Camden North to Camden McGuire: Construct a 115 kV Line

13) Poyen: Install a 10.8 MVAR Capacitor Bank

14) El Dorado Upland to Texas Eastern F: Construct 115 kV Line

15) Gobel: Construct 230/115 kV Substation

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Entergy Mississippi, Inc.

Proposed Transmission Reliability Projects

Transmission Planning Summit

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Grenada/Winona/Greenwood Area Improvement

2010 & 2012

2010 - 2012 EMI Transmission Reliability Projects

Ridgeland - Madison Reliability Improvement

2011-12

Horn Lake: Energize Auto & UpgradeHorn Lake – TH Allen 161kV Line

2011

Ray Braswell - Byram 115kV Line2013

Indianola-Greenwood 115 kV2010

Upgrade Switches at Magee2010

Waterways – E. Vicksburg 115kV Line Upgrade

2011

South Jackson – Florence 115kV Line Upgrade &

Switches at Morton 2010

Florence - Star 115kV Line Upgrade

2011Upgrade Breakers and

Switches at Baxter Wilson and Ray Braswell

2010

McAdams 500/230kV Auto &Upgrade McAdams-Pickens

230kV Line2011

Getwell 230/115kV Auto & Getwell-Hernando 230kV Line

(Operate at 115kV)2013

Install 500/115kV Auto at Baxter Wilson

2012

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Indianola-Greenwood Line Upgrade

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

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

• Loss of several sections including Pickens-Durant, Durant-Bowling Green, Attala-Kosciusko and Delta-Ruleville causes the Indianola-Moorhead section to overload.

Recommended Solution: • Replace the limiting substation equipment and increase the rating of

the line to 161 MVA.


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Indianola-Greenwood Line Upgrade

Itta Bena 115 kV Substation: Upgrade

Substation Equipment

Moorhead 115 kV Substation: Upgrade


Greenwood 115 kV Substation: Upgrade


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Upgrade Switches at Magee Substation

Scenario:• Entergy and SMEPA have a tie at Magee substation through two

161/115 kV, 150 MVA transformers.

• SMEPA has replaced the transformers with 336 MVA transformers to increase the contract path with Entergy. The switches on the 115kV side limits the new contract path limit to 480 MVA.

Recommended Solution:• Replace the existing switches to increase the tie capability to full

value (672 MVA) of the new transformers.


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Upgrade Switches at Magee Substation

Magee 115 kV Substation: Upgrade Substation

Equipment

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Upgrade Florence-South Jackson Line & Switches at Morton Substation

Scenario:• TVA requested transmission service across Entergy’s transmission

system from TVA to TVA. The transfer causes various lines to overload for a single contingency.

• Florence-South Jackson, Morton-Pelahatchie and Morton-West Forest (SOCO) 115kV lines overloads for the loss of Choctaw-WestPoint (TVA) 500kV line.

Recommended Solution: • Re-conductor Florence-South Jackson line and increase the rating of

the line to at least 183 MVA.

• Upgrade switches at Morton substation (from 600Amps to 1200 Amps) to increase the rating of Morton-Pelahatchie and Morton-West Forest (SOCO) lines to 176MVA and 154 MVA respectively.


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Upgrade Florence-South Jackson Line & Switches at Morton Substation

Florence – South Jackson 115 kV Line: Upgrade Line

Morton 115 kV Substation: Upgrade


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Baxter Wilson-Ray Braswell 500kV Line Equipment Upgrade

Scenario:• The Baxter Wilson to Ray Braswell 500kV line overloads for the

loss of the Franklin-Grand Gulf 500kV transmission line.

Recommended Solution: • The breakers and switches at Baxter Wilson and Ray Braswell

500kV substations must be upgraded to at least 3000 A. This upgrade increases the line capacity to 2884MVA.


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Baxter Wilson-Ray Braswell 500kV Line Equipment Upgrade

Baxter Wilson 500 kV Substation: Upgrade Substation Equipment

Ray Braswell 500 kV Substation: Upgrade Substation Equipment

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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:• Phase I: Install a capacitor bank at Schlater (21 MVAR), an additional bank at

Winona (21 MVAR) and upgrade the bank at Greenwood (32 MVAR).


• Phase II: Build a 230kV line from Tillatoba to S. Grenada with 1,272 ACSR (or equivalent conductor) and install a 230/115kV autotransformer at S.Grenada.


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Tillatoba – South Grenada 230 kV Line: Construct New Line

Schlater 115 kV Substation: Install Capacitor Bank

Greenwood 115 kV Substation: Upgrade

Capacitor Bank

Winona 115 kV Substation: Install

Capacitor Bank

South Grenada 115 kV Substation: Install 230 – 115

kV Autotransformer

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Florence-Star 115kV Line Upgrade

Scenario:• The Florence – Star 115kV line, located in central Mississippi, is

approximately 7 miles long and is limited to a rating of 161 MVA.

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

Recommended Solution:• Re-conductor the Florence-Star line and increase the rating of the

line to 240 MVA.


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Florence-Star 115kV Line Upgrade

Florence – Florence SS - Star 115 kV Line: Upgrade Line

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Horn Lake:Energize 230/161kV Autotransformer & Upgrade

Horn Lake – Allen (TVA) 161kV LineScenario: • 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.


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Horn Lake 230/161kV Auto & Allen Line Upgrade

Horn Lake 230 kV Substation:Energize 230 – 161 kV Autotransformer

Horn Lake – TH Allen 161 kV Line: Upgrade Line

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Reconductor Waterways-East Vicksburg 115kV Line

Scenario:• Vicksburg-Ray Braswell 115kV line is 27 miles long and serves

about 114MW load in 2011.

• The Waterways - East Vicksburg 115kV segment overloads for the loss of Baxter Wilson-Ray Braswell 500kV line.

Recommended Solution: • Reconductor the Waterways - East Vicksburg 115kV segment to

match the rating of Vicksburg-Waterways (240MVA) section.


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Reconductor Waterways-East Vicksburg 115kV Line

East Vicksburg – Waterways 115 kV Line:

Upgrade Line

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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. A new substation, Sunnybrook will be fed from this line (2011) which will add to the existing line loading.

• The loss of the Rex Brown - Hico, Hico - N. Jackson 115 kV lines in 2009 causes overloads on the Lakeover - Livingston Rd 115 kV line. The loss of the Lakeover - Livingston Rd or Livingston Rd - Ridgeland 115 kV lines causes the Rex Brown - Hico - N. Jackson 115 kV lines to overload.

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

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

Proposed In Service Date: 2011/2012

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Sunnybrook

Northpark 115

Ridgeland-Madison Reliability Improvement

Laveover – Livingston Road 115 kV Line: Upgrade Line

Laveover – Sunnybrook - Northpark 115 kV Line:

Construct New Line

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Install 2nd 500/230 kV Autotransformer at McAdams & Upgrade McAdams-Pickens 230 kV

LineScenario:• The 500/230 kV autotransformer at McAdams overloads for the loss

of McAdams - Lakeover 500 kV line.

• The McAdams - Pickens 230 kV line, which supports the Canton/Madison area, overloads when a 2nd 500/230 kV autotransformer is added to eliminate the overload of the existing transformer.

Recommended Solution: • Add 2nd 500/230 kV auto at McAdams substation. Upgrade McAdams

- Pickens 230 kV line with double bundled 954 ACSR (or equivalent) to a capacity of at least 880MVA.


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Install 2nd 500/230 kV Autotransformer at McAdams & Upgrade McAdams-Pickens 230 kV

Line

McAdams – Pickens 230 kV Line: Upgrade Line

McAdams 500 kV Substation: Install Second 500 – 230 kV

Autotransformer

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Add 2nd 500/115 kV Autotransformer at Baxter Wilson

Scenario:

• This is a part of the reliability project that is required to add the Ouachita generating facility (Transmission Service Request) to Entergy’s transmission network.

• The existing 500/115 kV autotransformer at Sterlington will be moved and installed at Baxter Wilson substation.


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Add 2nd 500/115 kV Autotransformer at Baxter Wilson

Baxter Wilson 500 kV Substation: Install Second 500 – 115 kV

Autotransformer

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Ray Braswell - Byram 115 kV Line Construction

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 2009.

• 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 through Wyndale (future

substation) to Byram 115 kV substation with a rating of at least 261 MVA.


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Ray Braswell – Byram 115 kV Line Construction

Ray Braswell – Byram 115 kV Line: Construct New Line

(230 kV Construction)

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Add 2nd 230/115 kV Autotransformer at Getwell & Getwell-Hernando 230 kV Line Construction

Scenario:• The Hornlake-Hernando area in Northwest Mississippi is experiencing

a high annual growth rate. The Getwell-Batesville 115 kV line will serve about 124 MW of load in 2013 and Getwell-Hornlake 115 kV serves about 145 MW.

• Loss of Getwell-Hernando 115 kV section overloads the Batesville-Sardis 115 kV section. Low voltages are also projected at Hernando, Coldwater and Senatobia substations. Loss of 230/115 kV auto at Getwell overloads the Hornlake-Greenbrook segment.

Recommended Solution:• Construct a new line from Getwell-Hernando with 230 kV

specifications (operating at 115 kV) with a minimum rating of 240 MVA.

• Install a second 230/115 kV autotransformer at Getwell.


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Add 2nd 230/115 kV Autotransformer at Getwell & Getwell-Hernando 230 kV Line

Construction

Getwell 230 kV Substation: Add Second 230 – 115 kV

AutotransformerGetwell – Hernando 115 kV Line:

Construct New Line(230 kV Construction)

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EMI Transmission System Target Areas 2014 and Beyond

Southhaven AreaChurch Rd-Getwell 230 kV Line

Lakeover-Canton 230 kV line

Breakers at Hollandale and Belzoni

Rankin-Ind. – Airport 115 kV

North Mississippi Improvement PlanContinue Getwell-Batesville 230kV line

entergy arkansas, inc. proposed transmission projects

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