Entergy Mississippi, Inc. Proposed Transmission Reliability Projects

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Entergy Mississippi, Inc.Proposed Transmission
Reliability Projects

• Entergy Transmission Planning Summit
• New Orleans, LA
• July 10, 2003

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2004/2005 EMI Transmission Reliability Projects
Capacitor Banks 2004
Andrus-Greenville Upgrade Line Carryover 2003-04
Tillatoba Auto 2005-06
Livingston Rd. Ridgeland Convert to 230kV
2005-06
Rankin-S. Jackson New 230kV Line Carryover
2003-2005
Franklin-Brookhaven Upgrade Line 2004-05
Georgetown-Hazelhurst New Line 2005-06
Franklin Auto 2003-04 Carryover
Amite-Fernwood Upgrade Line 2005-06
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Andrus to GreenvilleBuild New 115 kV Line

• Scenario
• The 115kV Gerald Andrus to Greenville loop is
  located in North Mississippi. It consists of
  two lines, 5.3 miles each. These lines serve the
  city of Greenville.
• The single contingency loss of either side of the
  loop overloads the remaining section by 30.
• Recommended Solution
• To relieve the overloading condition described
  above, reconductor the existing, 954 ACSR
  conductors to 954 ACSS to obtain a line rating of
  359 MVA on the two lines from Gerald Andrus to
  Greenville. The new ACSS conductor provides a
  higher ampacity than a comparable size ACSR
  conductor due to its metallurgical properties.
  This will allow most of the existing structures
  to be re-used providing a lower cost solution
  than the original proposal to build a third line
  from Gerald Andrus to Greenville.
• Estimated Cost 2,700,000

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Franklin 500/115 kV SubstationAdd Second
500/115 kV Autotransformer

• Scenario
• Franklin substation has three single-phase
  autotransformers, 500 MVA total, 500/115kV with a
  single-phase spare in place.
• Loss of one phase causes overloads on 115kV
  system and widespread undervoltages within the
  entire south Mississippi and north of Lake
  Pontchartrain area in ELIs service territory.
• As an interim solution, an undervoltage loadshed
  scheme has been installed for the loss of the
  transformer.
• Recommended Solution
• Install a parallel three phase autotransformer
  with breakers relaying
• Estimated Cost 8,800,000

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Jackson Improvement Plan Phase IRankin to S.
Jackson Build New 230 kV Line

• Scenario
• The 115kV system serving the Jackson area is
  heavily loaded. Single contingencies in the North
  and South Jackson area will cause overloads as
  high as 33 on the 115kV transmission system. The
  solution is to shift load off of the 115 kV
  system to the 230 kV system by converting
  Livingston Rd. 115 kV and Ridgeland 115 kV to 230
  kV. The completion of the 230kV loop around
  Jackson will allow for shifting load to the 230
  kV system. The line is currently scheduled for
  an ISD of 2005. The Livingston Rd. and Ridgeland
  230 kV conversions are proposed to be in service
  in 2005 and 2006.
• Recommended Solution
• Construct the Rankin to S. Jackson 230kV line.
  This will also allow for additional S. Jackson
  area load on the 115kV system to be moved to the
  230kV system.
• The proposed Rankin to S.Jackson 230kV line will
  be approximately 20 miles long.
• Estimated Cost 10,200,000

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Franklin to BrookhavenIncrease Line Capacity

• Scenario
• The Franklin to Brookhaven transmission path
  consist of two 115kV transmission lines. The
  Franklin to Brookhaven lines are critical sources
  into the south Mississippi area. It provides
  power from the 500kV system at Franklin. The
  north line ( Franklin-Vaughn-W.
  Brookhaven-Brookhaven) is constructed of 666
  ACSR.
• The loss of the south line ( Franklin-Brookhaven
  S.-Brookhaven) will overload the north line by
  23. Load will have to be shed during the peak
  season to reduce the overload to 100. There are
  no operating procedures to mitigate this
  circumstance. This overload will increase when a
  second autotransformer is added to Franklin.
• Recommended Solution
• Upgrade the line from Franklin to Vaughn to West
  Brookhaven to Brookhaven (18.26 miles) with 1590
  ACSR. Upgrade all appropriate switches, bus work
  and other devices as necessary.
• Estimated Cost 4,940,000

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Jackson Improvement Plan Phase IIConvert
Livingston Road Ridgeland to 230 kV

• Scenario
• The 115kV line from Lakeover-NE Jackson-Rex Brown
  is 25 miles long.
• The loss of the Lakeover - Livingston Rd. 115 kV,
  Livingston Rd. Ridgeland 115 kV, Rex Brown N.
  Jackson 115 kV or N. Jackson - Canton Rd. 115 kV
  in 2004 causes overloads on 4 lines by as much
  as 33. By 2007, 5 lines would overload by as
  much as 35.
• Recommended Solution
• Convert the Livingston Rd 115kV substation to
  230kV in 2005 and convert the Ridgeland 115kV
  Substation to 230kV in 2006 on the Lakeover to
  Luckney to Rankin 230kV line.
• Estimated Cost 1,700,000

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Tillatoba 230/115 kV SubstationAdd Second
230/115 kV Autotransformer

• Scenario
• Tillatoba substation has three single-phase
  autotransformers, 392 MVA total, 230/115kV with
  one single-phase spare in place.
• The loss of the Tillatoba 230/115kV
  autotransformer causes low voltages and numerous
  overloads throughout the northern Mississippi
  area. This contingency causes 18 buses to fall
  below 92 voltage and 9 line overloads.
• Recommended Solution
• Install a parallel single-phase autotransformer
  with Breakers Relaying
• Estimated Cost 4,800,000

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Georgetown to HazelhurstBuild New 115 kV Line

• Scenario
• The SW Jackson to Byram to Brookhaven line is 53
  miles long with 234MWs of load.
• The loss of SW Jackson - Elton 115 kV or Elton -
  Byram 115kV lines will overload the segments from
  Brookhaven to Hazlehurst by as much as 43 in
  2004. Voltages as low as 78 would be caused on
  16 buses from Terry to Brookhaven to McComb to
  Tylertown . By 2007, the voltages would decrease
  to as low as 62 on 29 buses, and the loss of
  Wesson - Brookhaven 115 kV or Wesson to James Rd.
  will cause overloads by 15 on SW Jackson - Elton
  - Byram 115kV line. This project will also delay
  the need to upgrade Ray Braswell West Jackson
  115 kV and Ray Braswell Forest Hill 115 kV
  lines.
• Recommended Solution
• Build a new 115kV line from Georgetown to
  Hazelhurst using 1272 conductor to obtain a line
  rating of 261 MVA.
• Estimated Cost 9,300,000

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Amite to FernwoodIncrease Line Capacity

• Scenario
• The Amite to Fernwood 115kV line, located in
  south Louisiana, north of Lake Pontchartrain,
  extending north into southern Mississippi is 32
  miles long. Amite is approximately 17 miles from
  the Mississippi state line and Fernwood is
  approximately 15 miles from the state line. This
  115kV line, constructed with 4/0 ACSR conductor,
  is part of the Amite to McComb tie between MPL
  and LPL.
• Single contingencies in Mississippi of Brookhaven
  to Mallalieu, Mallalieu to Norfield, Norfield to
  McComb or Franklin Auto in 2004 will cause
  overloads up to 70 on the Amite-Kentwood-Colonial
  Pipeline-Fernwood line segments.
• Recommended Solution
• Reconductor the existing, 4/0 ACSR (68MVA)
  conductors to 1272 to obtain a line rating of 261
  MVA on the line from Amite to Fernwood line.
• Estimated Total Cost 14.4M for ELI EMI
• EMIs portion 7,000,000

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2006 - 2008 EMI Planned Carryovers
Tillatoba Auto Carryover 2005-06
Livingston Rd. Ridgeland Convert to 230kV
Carryover 2005-06
Georgetown-Hazelhurst New Line Carryover 2004-06
Amite-Fernwood Upgrade Line Carryover 2005-06
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2006 - 2008 EMI Transmission Reliability Projects
Capacitor Banks 2005-08
Tillatoba to S. Grenada Build New Line 2007-08
Hollandale 230/115 kV Auto 2006-07
Ray Braswell Add Second 500/230kV Auto 2006-2007
Franklin to Brookhaven S. to Brookhaven Upgrade
Line 2007-08
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Ray BraswellAdd Second 500/230 kV
Autotransformer

• Scenario
• Ray Braswell has one 560 MVA, 500/230kV
  autotransformer and one 560MVA, 500/115kV
  autotransformer.
• The loss of the Ray Braswell to Lakeover 500kV
  line will overload both the Ray Braswell
  500/230kV and the Ray Braswell 500/115 kV
  autotransformers by 11 in 2007.
• Recommended Solution
• Install a parallel 560MVA 500/230MVA
  autotransformer with breakers relaying at Ray
  Braswell.
• Estimated Cost 15,000,000

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Franklin to Brookhaven South to
BrookhavenIncrease Line Capacity

• Scenario
• The Franklin to Brookhaven transmission path
  consists of two 115kV transmission lines. The
  Franklin to Brookhaven lines are a critical
  source into the south Mississippi area. It
  provides power from the 500kV system at Franklin.
  The south line ( Franklin - Brookhaven S. -
  Brookhaven) is constructed of 954 ACSR conductor.
  
• With the addition of a parallel 500/115
  autotransformer at Franklin, the loss of the
  north line (Franklin to Vaughn to Brookhaven)
  will overload the south line by 13 in 2007.
  Load will have to be shed during the peak season
  to reduce the loading on the line to 100. There
  are no operating procedures to mitigate this
  circumstance.
• Recommended Solution
• Upgrade the line from Franklin to Brookhaven S.
  to Brookhaven with 1780 ACSR. Upgrade all
  appropriate switches, bus work and other devices
  as necessary.
• Estimated Cost 5,000,000

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Hollandale SubstationInstall 230/115 kV
Autotransformer

• Scenario
• The Greenville to Hollandale 115kV line, located
  in northwest Mississippi, is 23.5 miles long and
  the Hollandale to North Vicksburg 115kV line is
  59 miles long.
• The loss of any section of line from Greenville
  to Hollandale will cause all the line sections
  from Vicksburg to Hollandale to overload by as
  much as 61 in 2007. This will also cause
  voltages as low as 51 from Redwood to
  Hollandale.
• Recommended Solution
• Connect Gerald Andrus - Ray Braswell 230 kV line
  into Hollandale and install a 230/115kV
  autotransformer. Before the transformer is
  installed, the Hollandale Greenville TCEPA SS
  S.E. Greenville 115 kV line must be upgraded to
  1272 ACSR (20 miles long).
• Estimated Cost 12,000,000 (Includes line
  upgrade)

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Tillatoba to South GrenadaBuild New 115 kV Line

• Scenario
• The 115kV line from Tillatoba to S. Grenada is 19
  miles long and part of a 43-mile line to Winona.
• The loss of the Tillatoba to Grenada line in 2004
  causes voltages as low as 81 on five buses, and
  overloads on three lines by as much as 34. In
  2007, there are 11 buses with voltages between
  92 to 62, and overloads on 7 115kV lines by 7
  to 93.
• Recommended Solution
• Build a single separate line from Tillatoba to S.
  Grenada with 1272 ACSR (or equivalent conductor).
  The line should be built for 230kV and operated
  at 115kV.
• Estimated Cost 6,000,000

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2009-2013 EMI Transmission Reliability Target
Areas
Batesville to Getwell Build 230kV line
Jackson 230kV Improvement Plan
Natchez Area
Franklin to McComb Build New 115kV line
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• Questions