Entergy Gulf States, Inc. (Texas) Proposed Transmission Reliability Projects

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Entergy Gulf States, Inc.(Texas)

Proposed Transmission Reliability Projects

Entergy Transmission Planning Summit

New Orleans, LA

July 31, 2007

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2007 EGSI-TX Completed Transmission Projects

Grimes 345/138 kV Substation Reconfiguration

AUTO #1

AUTO #2 FRO

NTIE

RC

RO

CK

ETT

RECONFIGURE 345kV BUS

RECONFIGURE 345kV BUS

INSTALL 138kV

BREAKER

INSTALL 138kV

BREAKER

INSTALL 345kV

BREAKER

INSTALL 345kV

BREAKER

345kV

138kV

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2007 EGSI-TX Completed Transmission Projects

Hanks and Kolbs 230 kV Upgrades

HanksKolbs

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2007-08 EGSI-TX Proposed Transmission Reliability Projects

69kV Blue WaterAdd Cap Bank

69kV CalvertExpand Cap Bank

Calvert

Blue Water

Replace Fawil 138/69 kV

Autotransformer

Fawil

EGSI-TX Underrated Breaker

Replacement

Helbig & West End

Cow & Orange

S. Beaumont, Dupont & Pt.

Neches

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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.– 2007

o Cow 69kV #5515, #5510o Orange 69kV #3165, 3145

– 2008o 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: $2.7 MM

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EGSI-TX 69kV Voltage Support

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

Calvert 69kV Substation. • Expand existing capacitor bank to 12MVAr• Proposed In-Service Date: 2008• Approximate Cost: $600 k

Blue Water 69kV Substation• Multiple contingencies cause undervoltages on 69kV Line 175 “Beach

Line.”• Install 11MVAr capacitor bank• Proposed In-Service Date: 2008• Estimated Cost: $500 k

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EGSI-TX 69kV Voltage Support

INSTALL 11MVAR

CAP BANK

INSTALL 11MVAR

CAP BANK

EXPAND EXISTING CAP BANK

EXPAND EXISTING CAP BANK

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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.• Proposed In-Service Date: 2008

Estimated Cost: $350 k

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Fawil: Replace 138/69 kV Autotransformer

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2009-10 EGSI-TX Proposed TransmissionReliability Projects

S. Beaumont

69kV Beaumont UpgradesYankee Doodle,

69kV Line 876 & Line 98

Porter

138kV Line 823/886Upgrade

Cedar Hill

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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: 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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138 kV Line 823/886(Porter – Tamina – Cedar Hill) Upgrade

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 6.3% thermal overloads on 138 kV Line 823/886 (Porter to Cedar Hill).

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

Cedar Hill) to 531 MVA capacity.• Upgrade station equipment at Tamina to bring rating of Line 823

Porter-Tamina up to 531 MVA capacity.• Proposed In-Service Date: 2009

Estimated Cost: $7.4 MM

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138kV Line 823/886(Porter – Tamina – Cedar Hill) Upgrade

UPGRADE TO 531MVA CAPACITY

UPGRADE TO 531MVA CAPACITY

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2011-12 EGSI-TX Proposed TransmissionReliability Projects

Jacinto

Cypress

Western Region Reliability Improvement

Plan - Phase 3

Lewis Creek

Inland Orange

Hartburg

230kV Line 195 Upgrade

Western Region Reliability Improvement

Plan - Phase 3A

RivtrinQuarry

GrimesHuntsville

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Western Region ReliabilityImprovement Plan

Phase 3 * • Convert 138 kV Lines 524/824 (Jacinto-Lewis Creek) to 230 kV operation.• Construct a 230 kV transmission line from Cypress to Jacinto.• Install static and dynamic VAR support in the Western Region.• Projected In-Service Date: 2011

Phase 3A (Alternative to Phase 3)• Construct new Quarry 345 kV Substation on Line 119.• Construct a new 345 kV transmission line from Quarry to Rivtrin.• Upgrade 138 kV transmission Line 485 (Grimes to Huntsville).• Additional firm network resources• Projected In-Service Date: 2011

Phase 4 (Projected ISD – 2013) *• Build new 230 kV line from Porter to Lewis Creek.

* Note: This set of projects may be modified based on further activities and developments occurring at the Louisiana and Texas Commissions.

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JACINTO

NEW 230kV LINE

NEW 230kV LINE

CONVERT LINE

824/524

CONVERT LINE

824/524

Western Region Reliability Improvement Plan

Phase 3

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Western Region Reliability Improvement Plan - Phase 3A

QUARRY

• Projects identified in Phases 3 and 4 of the WRRIP result in greater reliance on and strengthening of the transmission corridor between the Western Region and the Beaumont area.

• Because of recent events such as the isolation of the Western Region from the rest of the Entergy System, the Company has developed Phase 3A, which would strengthen the Western Region’s ties to the west.

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230 kV Line 195 (Hartburg-Inland Orange) 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: 2012

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230 kV Line 195 (Hartburg-Inland Orange) Upgrade

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Long Term Reliability Target Areas (2013 – 2017)

• The following transmission lines experience thermal overloads for various contingencies in the 2013 - 2017 time frame.

– 230 kV Line 496 (China – Sabine)• For the loss of Line 599 (China – Amelia)

– 138 kV Line 88 (Dayton – Cheek)• For the loss of Line 496 (China – Sabine)

– 138 kV Line 571 (Jacinto – Porter)• For the loss of Line 822 (China – Porter)

– 138 kV Line 150 (Dayton – Long John)• For the loss of Line 579 (Jacinto – Cleveland)

– 138 kV Line 561 (Gulfrich – Crown Orange)• For the loss of Line 590 (Gulfrich – Ausimont)

– 138 kV Line 582 (Oak Ridge – Porter)• For the loss of Line 886 (Tamina – Porter)

– 138 kV Line 86 (Dayton – Eastgate)• For the loss of Line 882 (China – Porter)

– 138 kV Line 515 (Sabine – Port Neches)• For the loss of Line 516 (Sabine – Port Neches)

– 138 kV Line 516 (Sabine – Port Neches)• For the loss of Line 515 (Sabine – Port Neches)

– 230 kV Line 195 (Helbig – Inland Orange)• For the loss of Line 547 (Cypress – Hartburg)

• The following substations experience under-voltages for various contingencies in the 2013 – 2017 time frame.

– Lacon 138 kV Substation

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230 kV Line 496 (China –

Sabine)

230 kV Line 496 (China –

Sabine)

138 kV Line 88 (Dayton -

Cheek)

138 kV Line 88 (Dayton -

Cheek)

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)

Long Term Reliability Target Areas (2013 – 2017)

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)

Lacon 138 kV

Substation

Lacon 138 kV

Substation

Long Term Reliability Target Areas (2013 – 2017)