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Entergy Texas, Inc.

Proposed Transmission Reliability Projects

Entergy Transmission Planning Summit

New Orleans, LA

July 29, 2008

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2008 ETI Completed Transmission Projects

Calvert 69kV Substation

• Loss of 69kV Line 159 (Bryan – APL Hearne) caused undervoltages at Calvert 69kV Substation.

• Expanded existing capacitor bank to 12 MVAr (Completed - January 2008)

• Actual Cost: $58 K

3

2008 ETI Completed Transmission Projects

EGSI-TX Breaker Upgrades

• Based on asymmetrical fault current analysis, various circuit breakers were identified as underrated.

• Replaced the identified underrated circuit breakers with appropriately sized breakers.

o Cow 69kV #5515, #5510 (Completed - January 2008)o Orange 69kV #3165, 3145 (Completed - July 2008)

• Actual Cost: $750 K

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2008-09 ETI Proposed Transmission Reliability Projects

69kV Blue WaterAdd Cap Bank

Blue Water

Replace Fawil 138/69 kV

Autotransformer

Fawil

EGSI-TX Underrated Breaker

Replacement

HelbigOrange

S. Beaumont, Dupont & Pt.

Neches

Newton Bulk

Re-tap Newton Bulk CT

College Station

Tamina

Porter-Tamina:Replace

Breaker/Switches

College Station Tap: Close N.O. Switch

69kV Beaumont Upgrades

Yankee Doodle, 69kV Line 876 &

Line 98

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Fawil: Replace 138/69 kV Autotransformer

Scenario:• Contingency events along 69 kV Line 81 (Fawil-Deweyville-Echo)

cause loads on Line 81 to be served radially through the Fawil 138/69 kV autotransformer, resulting in overloads on the transformer during peak load conditions. The transformer is currently rated at 20 MVA.

Recommended Solution:• Replace the autotransformer with a system spare 138/69 kV, 45 MVA

unit, located at Meaux substation in Louisiana.• Perform necessary reconfiguration/relay work to ensure reliable

operation• Proposed In-Service Date: December 2008

Estimated Cost: $1 MM

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Fawil: Replace 138/69 kV Autotransformer

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Newton Bulk: Re-tap CT

Scenario:• The single contingency outage of the Cypress-Hartburg 500 kV line

causes an overload of the Newton Bulk-Holly Springs 138 kV line. The rating of this line is limited to 143 MVA by a CT ratio at Newton Bulk.

Recommended Solution:• Re-tap the CT at Newton Bulk to achieve a rating of 280 MVA on the

line• Proposed In-Service Date: December 2008

Estimated Cost: $100 K

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Newton Bulk: Re-tap CT

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EGSI-TX Breaker UpgradesScenario:• Based on asymmetrical fault current analysis, various circuit

breakers have been identified as underrated.

Recommended Solution:• Replace the identified underrated circuit breakers with

appropriately sized breakers.– 2008

o Orange 69kV #3365o South Beaumont 69kV #3700o Port Neches 138kV #3345

– 2009o Dupont Bulk 69kV #3255, #3260o Helbig 69kV #5585o Orange 69kV #3370

o Estimated cost: $1.8 MM

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Blue Water: Install Capacitor Bank

Scenario:• Multiple contingencies cause undervoltages on 69kV Line 175 “Beach

Line.”

Recommended Solution:• Install 11MVAr capacitor bank at Blue Water 69kV• Proposed In-Service Date: March 2009

Estimated Cost: $800 K

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Blue Water: Install Capacitor Bank

INSTALL 11MVAR

CAP BANK

INSTALL 11MVAR

CAP BANK

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College Station Tap: Close N.O. Switch

Scenario:• The single contingency outage of the Grimes-Navasota 138kV line

causes overloads along the Lewis Creek-Longmire 138kV line, as well as undervoltages along the Navasota-Longmire 138kV line.

Recommended Solution:• Close the normally-open switch between Speedway 138kV and the

College Station 138kV tap to bring another path from Grimes into Navasota

• Proposed In-Service Date: May 2009

Estimated Cost: $3 MM

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College Station Tap: Close N.O. Switch

COLLEGESTATION TAP

N.O.

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69 kV Beaumont Network Upgrades

Scenario:• In the 69kV Beaumont area there exists several single contingency

thermal overloads including:o 69kV Line 581 (Helbig – Rosedale)o 69kV Line 468 (Elizabeth – Gallier)o 230/69kV Helbig Autotransformerso 69kV Bus Tie Breakers (Helbig & Amelia)

Recommended Solution:• Add line breakers at Yankee Doodle 69kV Substation.• Close normally open points at Lincoln and Crockett 69kV Substations.• Rebuild 69kV Line 576 (Lincoln – South Beaumont) & 69kV Line

98/190 (Dupont Beaumont – South Beaumont) to 106MVA capacity.o Approximately 5.5 miles of 69kV transmission lines

o Proposed In-Service Date: August 2009

Estimated Cost: $8 MM

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69 kV Beaumont Network Upgrades

CARDINAL

LAMAR

SOUTH BEAUMONTBULK

VIRGINIALINCOLN

YANKEEDOODLE

CROCKETT

DUPONT BEAUMONT

NITROCDT

L-458

L-458

L-1

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UPGRADE LINE 576

UPGRADE LINE 576

UPGRADE LINE 190

UPGRADE LINE 190

UPGRADE LINE 98

UPGRADE LINE 98

CLOSE N.O.

SWITCH

CLOSE N.O.

SWITCH

CLOSE N.O.

BREAKER

CLOSE N.O.

BREAKER

ADD LINE BREAKERS

ADD LINE BREAKERS

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Porter-Tamina: Replace Breaker/Switches

Scenario:• 138 kV Line 823/886 (Porter – Tamina - Cedar Hill) is one of the

primary sources into the Montgomery County load pocket.• The single contingency loss of 138 kV Line 582 (Oak Ridge - Porter)

causes thermal overloads on 138 kV Line 823 (Porter to Tamina).

Recommended Solution:• Upgrade station equipment at Tamina, including a breaker and

several switches, to bring rating of Line 823 Porter-Tamina up to 478 MVA capacity.

• Proposed In-Service Date: 2009

Estimated Cost: $2 MM

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Porter-Tamina: Replace Breaker/Switches

UPGRADE TO 478 MVA

CAPACITY BY REPLACING

TAMINA EQUIPMENT

UPGRADE TO 478 MVA

CAPACITY BY REPLACING

TAMINA EQUIPMENT

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2010-11 ETI Proposed TransmissionReliability Projects

Tamina

Tamina – CedarHill 138kV Reconductor

Cedar Hill

Inland Orange

Hartburg

Hartburg – Inland Orange 230kV Line

Upgrade

Western Region Reliability Improvement Plan - Phase 3 Interim

Jacinto

Lewis Creek

Alden

South Beaumont

Fontenot’s Corner

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Tamina – Cedar Hill 138kV Reconductor

Scenario:• 138 kV Line 823/886 (Porter – Tamina - Cedar Hill) is one of the

primary sources into the Montgomery County load pocket.• The single contingency loss of 138 kV Line 582 (Oak Ridge - Porter)

causes thermal overloads on 138 kV Line 886 (Tamina - Cedar Hill).

Recommended Solution:• Re-conductor approximately 6 miles of 138kV Line 886 (Tamina –

Cedar Hill) to 478 MVA capacity.• Proposed In-Service Date: 2011

Estimated Cost: $8.5 MM

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Tamina – Cedar Hill 138kV Reconductor

UPGRADE TO 531MVA CAPACITY

UPGRADE TO 531MVA CAPACITY

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Hartburg-Inland Orange 230 kV Line Upgrade

Scenario:• 230 kV Line 195 (Hartburg – Inland Orange) is one of the primary

sources into the Beaumont/Port Arthur area.• The single contingency loss of 500 kV Line 547 (Cypress – Hartburg)

causes thermal overloads on Line 195.

Recommended Solution:• Re-conductor approximately 4 miles of 230kV Line 195 (Hartburg –

Inland Orange) to 1042 MVA capacity.• Projected In-Service Date: 2010

Estimated Cost: $4 MM

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230 kV Line 195 (Hartburg-Inland Orange) Upgrade

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Western Region Reliability Improvement PlanPhase 3 Interim

Scenario:• Load growth within the Western Region load pocket is such that

transmission improvements are necessary to reliably serve the area under an N-1, G-1 contingency criteria

Recommended Solution:• Convert 138 kV Lines 524/824 (Jacinto-Lewis Creek) to 230 kV operation [~30

miles]• Convert Peach Creek Substation (ETEC-owned) from 138 kV to 230 kV Operation• Relocate Caney Creek load delivery point (ETEC-owned) to new location on 138

kV Line 587 (Lewis Creek – Conroe)• Install 230 kV Substation at Lewis Creek including 230/138 kV autotransformer• Reconductor Line 88/66 from Fontenot’s Corner to South Beaumont 138 kV

station [~9 miles]• Install 200 MVAr SVC at Alden 138 kV substation in The Woodlands

Estimated Cost: $98 MM

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Western Region Reliability Improvement Plan

Phase 3 Interim

200 MVAr SVC at Alden 138 kV

200 MVAr SVC at Alden 138 kV

Upgrade Line 88/66

Upgrade Line 88/66

Convert Line 524/824

Convert Line 524/824

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2012-13 ETI Proposed TransmissionReliability Projects

Cypress

Western Region Reliability Improvement

Plan - Phase 3 Final

Jacinto

Jasper

Sam Rayburn

Dam

China

Amelia

ReconductorJasper – Rayburn

138 kV Line

New China – Amelia230 kV Line

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Western Region Reliability Improvement Plan

Phase 3 Final

Scenario:• Load growth within the Western Region load pocket is such that

transmission improvements are necessary to reliably serve the area under an N-1, G-1 contingency criteria

Recommended Solution:• Construct a 230 kV transmission line from Cypress to Jacinto, with

series compensation• Projected In-Service Date: 2012

Estimated Cost: $116 MM

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Western Region Reliability Improvement Plan

Phase 3 Final

Construct New Cypress - Jacinto

230 kV Line

Construct New Cypress - Jacinto

230 kV Line

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Western Region Reliability Improvement Plan

Phase 3 AlternativeScenario:• If the decision is made by the PUCT that ETI will move to the ERCOT

retail open access (ROA) market, the WRRIP Phase 3 Final project will not be sufficient to address the load growth in the Western Region

Recommended Solution:• Reconductor Grimes-Huntsville 138 kV line • Build new Quarry 345 kV switching station• Build new Quarry-Rivtrin 345 kV line• Build new Grimes-Frontier 345 kV line• This solution would also require additional firm resources• Projected In-Service Date: 2012

Estimated Cost: $100 MM

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Western Region Reliability Improvement Plan

Phase 3 Alternative

QUARRY

• WRRIP Phase 3 Final will result in strengthening of and greater reliance on the transmission corridor between the Western Region and the Beaumont area.

• If the decision is made to move ETI to the ERCOT ROA market, Phase 3 Alternative would be implemented, which would strengthen the Western Region’s ties to the west.

• This solution would also require additional firm resources

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Reconductor Jasper-Rayburn138 kV Line

Scenario:• The single contingency outage of the Cypress-Hartburg 500

kV line causes an overload of the Jasper-Rayburn 138 kV line

Recommended Solution:• Reconductor the Jasper-Rayburn 138 kV line to achieve a

rating of 265 MVA• Proposed In-Service Date: 2012

Estimated Cost: $13 MM

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Reconductor Jasper-Rayburn138 kV Line

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New China-Amelia 230 kV Line

Scenario:• The single contingency outage of the China-Amelia 230 kV

line causes an overload of the China-Sabine 230 kV line

Recommended Solution:• Construct a new 230 kV line from China to Amelia• Proposed In-Service Date: 2013

Estimated Cost: $23 MM

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New China-Amelia 230 kV Line

AMELIA

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138 kV Line 150 (Dayton – New Long

John)

138 kV Line 150 (Dayton – New Long

John)230 kV Lines 515 & 516

(Sabine – Port Neches)

230 kV Lines 515 & 516

(Sabine – Port Neches)

138 kV Line 86 (Dayton -

Eastgate)

138 kV Line 86 (Dayton -

Eastgate)

Identified Target Areas 2012 and Beyond

230 kV Line 195 (Helbig –

Inland Orange)

230 kV Line 195 (Helbig –

Inland Orange)

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138 kV Line 571 (Jacinto –

Porter)

138 kV Line 571 (Jacinto –

Porter)

138 kV Line 582 (Porter – Oak Ridge)

138 kV Line 582 (Porter – Oak Ridge)

New Caney 138 kV

Substation

New Caney 138 kV

Substation

Identified Target Areas 2012 and Beyond

Cleveland 138 kV

Substation

Cleveland 138 kV

Substation

138 kV Line 886 (Conroe – Cedar Hill)

138 kV Line 886 (Conroe – Cedar Hill)

138 kV Line 96 (Navasota – Longmire)

138 kV Line 96 (Navasota – Longmire)

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Identified Target Areas 2012 and Beyond

138 kV Line 97 (Fork Creek –

Rayburn)

138 kV Line 97 (Fork Creek –

Rayburn)