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Entergy Texas, Inc. Proposed Transmission Reliability Projects. Entergy Transmission Planning Summit New Orleans, LA July 29, 2008. 2008 ETI Completed Transmission Projects. Calvert 69kV Substation Loss of 69kV Line 159 (Bryan – APL Hearne) caused undervoltages at Calvert 69kV Substation.

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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


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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.

    • Cow 69kV #5515, #5510 (Completed - January 2008)

    • Orange 69kV #3165, 3145 (Completed - July 2008)

  • Actual Cost: $750 K


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    2008-09 ETI Proposed Transmission Reliability Projects

    Replace Fawil 138/69 kV Autotransformer

    Re-tap Newton Bulk CT

    College Station Tap: Close N.O. Switch

    Newton Bulk

    College Station

    Fawil

    Tamina

    Orange

    Helbig

    69kV Beaumont Upgrades

    Yankee Doodle,

    69kV Line 876 & Line 98

    S. Beaumont, Dupont & Pt. Neches

    Porter-Tamina:

    Replace Breaker/Switches

    EGSI-TX Underrated Breaker Replacement

    69kV Blue Water

    Add Cap Bank

    Blue Water


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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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    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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    EGSI-TX Breaker Upgrades

    Scenario:

    • 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

        • Orange 69kV #3365

        • South Beaumont 69kV #3700

        • Port Neches 138kV #3345

      • 2009

        • Dupont Bulk 69kV #3255, #3260

        • Helbig 69kV #5585

        • Orange 69kV #3370

    • 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


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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

    COLLEGE

    STATION 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:

      • 69kV Line 581 (Helbig – Rosedale)

      • 69kV Line 468 (Elizabeth – Gallier)

      • 230/69kV Helbig Autotransformers

      • 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.

      • Approximately 5.5 miles of 69kV transmission lines

    • Proposed In-Service Date: August 2009

      Estimated Cost: $8 MM


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    69 kV Beaumont Network Upgrades

    CROCKETT

    CLOSE N.O. BREAKER

    CLOSE N.O. SWITCH

    YANKEE

    DOODLE

    L-155

    VIRGINIA

    LINCOLN

    L-458

    CARDINAL

    ADD LINE BREAKERS

    UPGRADE LINE 576

    L-458

    UPGRADE LINE 190

    LAMAR

    CDT

    NITRO

    DUPONT BEAUMONT

    SOUTH BEAUMONT

    BULK

    UPGRADE LINE 98


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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


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    2010-11 ETI Proposed Transmission

    Reliability Projects

    Western Region Reliability Improvement Plan - Phase 3 Interim

    Lewis Creek

    Hartburg

    Alden

    Hartburg – Inland Orange 230kV Line Upgrade

    Jacinto

    Cedar Hill

    Tamina

    Fontenot’s Corner

    Inland Orange

    South Beaumont

    Tamina – Cedar

    Hill 138kV Reconductor


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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


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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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    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 PlanPhase 3 Interim

    Convert Line 524/824

    Upgrade Line 88/66

    200 MVAr SVC at Alden 138 kV


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    2012-13 ETI Proposed Transmission

    Reliability Projects

    Reconductor

    Jasper – Rayburn

    138 kV Line

    Sam Rayburn Dam

    Jasper

    Cypress

    Jacinto

    Amelia

    China

    Western Region Reliability Improvement Plan - Phase 3 Final

    New China – Amelia

    230 kV Line


    Western region reliability improvement plan phase 3 final l.jpg
    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


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    Western Region Reliability Improvement Plan Phase 3 Alternative

    Scenario:

    • 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


    Western region reliability improvement plan phase 3 alternative29 l.jpg

    QUARRY

    Western Region Reliability Improvement Plan Phase 3 Alternative

    • 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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    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



    Slide34 l.jpg

    Identified Target Areas 2012 and Beyond

    230 kV Line 195 (Helbig – Inland Orange)

    138 kV Line 150 (Dayton – New Long John)

    230 kV Lines 515 & 516 (Sabine – Port Neches)

    138 kV Line 86 (Dayton - Eastgate)


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    Identified Target Areas 2012 and Beyond

    138 kV Line 96 (Navasota – Longmire)

    Cleveland 138 kV Substation

    New Caney 138 kV Substation

    138 kV Line 886 (Conroe – Cedar Hill)

    138 kV Line 571 (Jacinto – Porter)

    138 kV Line 582 (Porter – Oak Ridge)


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    Identified Target Areas 2012 and Beyond

    138 kV Line 97 (Fork Creek – Rayburn)


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