Entergy Gulf States, Inc. (Texas) Approved

1
Entergy Gulf States, Inc.(Texas)Approved
Proposed Transmission Reliability Projects

• Entergy/ETEC Subcommittee Meeting
• The Woodlands, TX
• November 28, 2006

2
Recap of 2004-06 EGSI-TX TransmissionWestern
Region Reliability Improvement Plan Phase II

• Scenario
• In 2003, several planning studies indicated the
  Western Region has the potential to encounter
  voltage stability problems and thermal
  overloading under the double contingencies listed
  below.
• Loss of Lewis Creek Unit 345 kV Line 119
  (Crockett-Grimes)
• Loss of Lewis Creek Unit 230 kV Line 568
  (China-Jacinto)
• Loss of both Lewis Creek Units
• Recommended Solution
• Phase II of the Western Region Reliability
  Improvement Plan addresses the projected load
  growth with the following projects
• 500/230 kV Auto (Cypress) COMPLETED
• Construct Line 822 (China-Porter) 230 kV
  COMPLETED
• Construct 230/138 kV Porter Substation
  COMPLETED
• Upgrade Line 599 (Amelia-China) 230 kV
  COMPLETED
• Install 300 MVAr SVC at Porter Substation
  COMPLETED
• Install series compensation on Line 822
  (China-Porter) COMPLETED
• Estimated Cost 115 MM

3
2006 EGSI-TX Approved Transmission Reliability
ProjectsWestern Region Phase II
INSTALLED SERIES CAPACITOR ON LINE 822
INSTALLED 300 MVAr SVC
4
Approved 2007 EGSI-TXTransmission Reliability
Projects inEntergys Construction Plan
Project Name In Service Year Estimated Cost (MM) Comments
Grimes Reconfigure Substation 2007 0.5 Approved
Kolbs Hanks 230 kV Bus Upgrades 2007 0.2 Approved
Splendora Switch Clearance/Replacement (Mandatory Safety) 2007 0.08 Approved
EGSI-TX Underrated Breaker Upgrades (12- 69 kV breakers, Mandatory Safety) 2007 - 2008 1.3 Approved
Calvert Expand cap bank to 12 MVAr 2008 0.6 Approved
Sandy Shores Install 11 MVAr cap bank 2008 0.5 Scoping Only
Porter-Tamina-Conroe Upgrade 138 kV lines 2008 5.5 Approved
Beaumont 69 kV Improvement Plan 2009 8 Approved
Western Region Reliability Improvement Plan Phase 3 2010 2 Scoping Engineering Only
5
Approved EGSI-TX Transmission Reliability
Projects in Entergys Construction Plan

• Others
• WRRIP- Phase 3 Scoping Engineering
• Upgrades of underrated breakers (various
  locations, mandatory-safety)
• Splendora Replace switch (mandatory-safety)

Grimes Reconfigure 345/138 kV Substation
Calvert Expand 69 kV Cap Bank
Calvert
Grimes
Conroe
Porter
Tamina
Helbig
Amelia
Porter-Tamina-Conroe Upgrade 138kV Lines
Hanks
South Beaumont
Kolbs Hanks Upgrade 230 kV Bus
Kolbs
Sandy Shores
Beaumont 69 kV System Improvement Plan
Sandy Shores Add 69 kV Cap Bank
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Grimes 345/138 kV Substation Reconfiguration

• Scenario
• 345/138 kV autotransformers tied to same node of
  345 kV and 138 kV ring busses.
• Single contingency loss of either 345/138 kV
  autotransformer causes the loss of the parallel
  autotransformer.
• Recommended Solution
• Install a 345 kV circuit breaker to separate
  autotransformers on 345kV ring and reconfigure
  station to alternate lines and loads.
• Install 138 kV breaker to separate
  autotransformers on 138 kV ring.
• Estimated Cost 0.5 MM (2007 cost only)

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Grimes 345/138 kV Substation Reconfiguration
2007
RECONFIGURE 345 kV BUS
CROCKETT
345kV
INSTALL 345 kV BREAKER
AUTO 1
FRONTIER
138kV
AUTO 2
INSTALL 138 kV BREAKER
8
Hanks Kolbs Upgrade Substation Bus

• Scenario
• Firm load within the Port Arthur area has grown
  such that the Hanks and Kolbs substation through
  bus overloads under the loss of the Sabine to Mid
  County 230 kV line.
• Recommended Solution
• Upgrade limiting elements of substation bus at
  Hanks Kolbs.
• Estimated Cost 0.2 MM

9
Hanks Kolbs Upgrade Substation Bus
Kolbs
Hanks
10
EGSI-TX Circuit 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.
• 2006
• Cow 69kV 5515, 5510
• Orange 69kV 3165, 3145
• 2007
• Orange 69kV 3365
• South Beaumont 69kV 3700
• Port Neches 138kV 3345
• West End 69kV 22135
• 2008
• Orange 69kV 3370
• Dupont Bulk 69kV 3255, 3260
• Helbig 69kV 5585

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EGSI-TX 69 kV System Voltage Support

• Calvert 69 kV Substation
• Loss of 69 kV Line 159 (Bryan APL Hearne)
  causes under-voltages at Calvert 69 kV
  Substation.
• Expand existing capacitor bank to 12 MVAr
• Approximate Cost 0.6 MM
• Sandy Shores 69kV Substation
• Multiple contingencies cause under-voltages on 69
  kV Line 175 Beach Line.
• Install 11 MVAr capacitor bank
• Estimated Cost 0.5 MM

12
EGSI-TX 69 kV Voltage Support
2007
EXPAND EXISTING CAP BANK
INSTALL 11MVAR CAP BANK
13
Porter-Tamina-ConroeUpgrade 138 kV Lines 823
886

• Scenario
• Lines 823 886 are 138 kV tie lines to the
  Western Region and the Conroe area specifically.
• The loss of 138 kV Line 886 (Oak Ridge Porter)
  overloads Lines 823 886 above their thermal
  limits.
• Recommended Solution
• Upgrade Line 886 (Tamina Conroe) to 531 MVA
  capacity replace switches and breaker at Tamina
  Substation to increase rating on the
  Porter-Tamina line segment.
• Estimated Cost 5.5 MM

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Porter-Tamina-ConroeUpgrade 138 kV Lines 823
886
2007
UPGRADE TO 531MVA CAPACITY
15
69 kV Beaumont Network Upgrades

• Scenario
• In the 69 kV Beaumont area there exists several
  single contingency thermal overloads including
• 69 kV Line 581 (Helbig Rosedale)
• 69 kV Line 468 (Elizabeth Gallier)
• 230/69 kV Helbig Autotransformers
• 69 kV Bus Tie Breakers (Helbig Amelia)
• Recommended Solution
• Add line breakers at Yankee Doodle 69 kV
  Substation.
• Close normally open points at Lincoln and
  Crockett 69 kV Substations.
• Rebuild 69 kV Line 576 (Lincoln South Beaumont)
  69 kV Line 98/190 (Dupont Beaumont South
  Beaumont) to 106 MVA capacity.
• Approximately 5.5 miles of 69 kV transmission
  lines
• Estimated Cost 8 MM

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69 kV Beaumont Network Upgrades
2007
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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2010
Western Region Reliability Improvement
PlanPhase III and IV

• Western Region Reliability Improvement Plan
  (Phases 3 4)
• Potentially convert 138 kV Lines 524/824
  (Jacinto-Lewis Creek) to 230 kV operation.
• Construct a 230 kV transmission line from Cypress
  to Jacinto.
• Construct a 230 kV transmission line from Porter
  to Lewis Creek.
• Install static and dynamic VAR support in the
  Western Region.
• 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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Alternatives to the Western Region Reliability
Improvement Plan

• Projects identified in Phases 3 and 4 of the
  WRRIP results 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 several
  alternatives to the projects described above.
  These alternatives would strengthen the Western
  Regions ties to the west.

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WRRIP Alternative 1

• Enhancement of the reliability at Grimes
  Substation in order to reduce the reliance from
  the Beaumont area
• Upgrades of 138 kV Lines 112 and 485 to
  sufficient capacity
• Installation of a 345 kV bulk tie between Grimes
  and Lewis Creek
• This option also requires additional firm local
  generation.

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WRRIP Alternative 2

• Enhancement of the reliability of the 345 kV tie
  to AEP-West in order to reduce reliance from the
  Beaumont area.
• Upgrade of 138 kV Line 485 to sufficient capacity
• Installation of a 345 kV switchyard on Line 119
  including a 345 kV tie line to Rivtrin Substation
• This option also requires additional firm local
  generation.

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ALT 2
Construct 345 kV Network Into Rivtrin
Enhance 138kV and 345kV Network at Grimes and
Lewis Creek
Construct/ Enhance 230 kV Network Into Lewis Creek
Current Plan Phases 3 4
ALT 1
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Approved 2007 ETEC-RelatedTransmission
Reliability Projects inEntergys Construction
Plan
Project Name In Service Year Estimated Cost (MM) Comments
JNEC Deweyville - Add breakers cut-in Line 2007 0.4 Approved
SHECO - Menard Substation Upgrades 2007 0.1 Approved
SHECO - Turkey Creek Substation Upgrades 2007 0.1 Approved
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Longer-Term Reliability Target Areas (2011)
Potential thermal overloads under single
contingency conditions

• 230 kV Line 496 (China Sabine)
• For the loss of Line 599 (China Amelia)
• 230 kV Line 194 (Hartburg-Helbig)
• For the loss of the Hartburg-Cypress 500 kV line
• 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)
• 138 kV overloads in the Jasper-Newton area
• For the loss of the Hartburg-Cypress 500 kV line
• 138 kV Lines from between Lewis Creek and Dobbin
• For the loss of 138kV sources from either the
  Lewis Creek or Grimes end
• Could be addressed by the Longmire
  reconfiguration project

• Other target areas/ projects
• Depressed voltages in the Lacon Substation area
• WRRIP Phase 4