Entergy Texas, Inc' Proposed Transmission Reliability Projects

1
Entergy Texas, Inc.Proposed Transmission
Reliability Projects

• Entergy Transmission Planning Summit
• New Orleans, LA
• July 29, 2008

2
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.
• Cow 69kV 5515, 5510 (Completed - January 2008)
• Orange 69kV 3165, 3145 (Completed - July 2008)
• Actual Cost 750 K

4
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
5
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

6
Fawil Replace 138/69 kV Autotransformer
7
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

8
Newton Bulk Re-tap CT
9
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

10
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

11
Blue Water Install Capacitor Bank
INSTALL 11MVAR CAP BANK
12
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

13
College Station Tap Close N.O. Switch
COLLEGE STATION TAP
N.O.
14
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

15
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
16
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

17
Porter-Tamina Replace Breaker/Switches
UPGRADE TO 478 MVA CAPACITY BY REPLACING TAMINA
EQUIPMENT
18
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
Fontenots Corner
Inland Orange
South Beaumont
Tamina Cedar Hill 138kV Reconductor
19
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

20
Tamina Cedar Hill 138kV Reconductor
UPGRADE TO 531MVA CAPACITY
21
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

22
230 kV Line 195 (Hartburg-Inland Orange) Upgrade
23
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 Fontenots 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

24
Western Region Reliability Improvement PlanPhase
3 Interim
Convert Line 524/824
Upgrade Line 88/66
200 MVAr SVC at Alden 138 kV
25
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
26
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

27
Western Region Reliability Improvement Plan
Phase 3 Final
Construct New Cypress - Jacinto 230 kV Line
28
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

29
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
  Regions ties to the west.
• This solution would also require additional firm
  resources

30
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

31
Reconductor Jasper-Rayburn138 kV Line
32
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

33
New China-Amelia 230 kV Line
AMELIA
34
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)
35
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)
36
Identified Target Areas 2012 and Beyond
138 kV Line 97 (Fork Creek Rayburn)