Entergy Arkansas, Inc' Proposed Transmission Reliability Projects

1
Entergy Arkansas, Inc.Proposed Transmission
Reliability Projects

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

2
2004/2005 EAI Transmission Projects
1.) Reconductoring of Lynch - Jacksonville North
115 kV Line
7.) Reconductoring of Trumann - Harrisburg Tap
161 kV Line
9
10
2
3
2.) Silver Hill New Ring Bus at Intersection of
EAI and SPA lines
7
8.) Mohawk New 345 / 115 kV Substation (ISD
2006)
1
9.) Reconductoring of Corning - Texas Eastern 8
115 kV Line (ISD 2006)
3.) Dell 500 / 161 kV Autotransformer Addition
6
10.) New 161 kV Line Osage Creek -Grandview Line
(ISD 2006)
4.) Couch 115 kV Switch Riser Replacement
5.) New 115 kV Camden Maguire - Camden North Line
Carryover from 2003
5
2004 Projects
2005 Projects
6.) Gobel - New 230 / 115 kV Substation near
Marvell (2005)
4
8
3
Lynch - Jacksonville North Area
4
Lynch - Jacksonville North 115 kV Line
Reconductoring

• Scenario
• The loss of the Jacksonville North - Sylvan Hills
  115 kV line segment will cause loading in excess
  of 129 on the Lynch - McAlmont 115 kV line
  segment, and 108 on the McAlmont - Jacksonville
  South.
• Jacksonville South - Jacksonville North also
  overloads in future years.
• Line is constructed with 666 mcm conductor and
  limited to 800 Amps (159 MVA).
• Proposed Solution
• This project proposed to reconductor the three
  line segments with 1272 ASCR conductor to achieve
  a 261 MVA rating (64 increase).
• Estimated Cost 5,600,000

5
Marshall Area
6
Silver Hill 161 kV Ring BusBetween EAI and SPA
Lines

• Scenario
• The SPA Bull Shoals - Dardanelle transmission
  line crosses the APL Harrison East - Quitman line
  near the Marshall substation.
• The Summit - Harrison East line segment is
  constructed to a different design specification,
  and transmission line sag has necessitated a line
  derating. The loss of the Eureka Springs - Osage
  Creek line segment causes the Summit - Harrison
  East line segment to overload to 139.
• Opening the line to avoid the overload causes the
  contingency voltage at Harrison to drop from
  0.9121 p.u. to 0.6487 p.u.
• Proposed Solution
• Joining the existing lines enhances voltage
  support to Harrison, especially following loss of
  Eureka Springs - Osage Creek.
• This configuration redirects power flow out of
  Bull Shoals, effectively unloading the Summit -
  Harrison East line segment.
• Estimated Cost 3,350,000

7
Dell Area
8
Autotransformer Additionat Dell Substation

• Scenario
• Dell 500/161 kV substation provides a high
  voltage source to the
• northeastern area of Arkansas.
• There are presently 4 single phase autos (3
  in-service and 1 spare)
• Each transformer has a rated capacity of 224 MVA.
• The system was planned to accommodate the loss of
  a single phase,
• since a spare can be quickly connected.
• Loss of the entire autotransformer will cause
  depressed voltages at Dell and the surrounding
  area.
• Proposed Solution
• Install a single 3 phase autotransformer.
• Estimated Cost 8,000,000

9
Couch Area
10
Replace Switch Risers at Couch

• Scenario
• Loss of the Magnolia East - McNeil transmission
  line segment causes an overload on the Couch -
  Magnolia Dow line segment.
• The overload is projected to exceed 128 in 2004.
• Line is 666 mcm conductor, but is currently rated
  120 MVA, due to switch risers at Couch.
• Proposed Solution
• Replace switch risers at Couch on the Magnolia
  Dow line to increase the rating on the line from
  Couch-Magnolia Dow.
• Estimated Cost 73,000

11
Camden Area
12
Camden Maguire to Camden North 115kV New Line
Construction

• Scenario
• Loss of the breaker-to-breaker segment from
  Camden Nth to McClellan leaves a very long line
  single-ended from Woodward. Also, if the
  McClellan plant is not generating, there is
  insufficient voltage support for the area.
• The Woodward - Rison transmission line segment is
  projected to overloaded under these scenarios in
  the year 2003.
• Low voltages also manifest in future years along
  the entire line, from Woodward to Camden Maguire,
  even with the McClellan plant operating.
• Proposed Solution
• Rebuild the existing Camden Nth substation to
  accommodate three lines. Two of the three lines
  will be the existing two lines at the substations
  (line to McClellan and to Fordyce). The third
  line will be a new 115kV line extending towards
  Camden Maguire.
• Estimated Cost 6,300,000

13
Marvell Area
14
230 / 115 kV Substation Construction (Gobel)
near Marvell

• Scenario
• Loss of the Helena Industrial - Ritchie SES line
  segment causes low single-contingency voltage
  (0.7222 p.u.) in the Helena area.
• Loss of the Helena Industrial - Ritchie SES line
  segment also causes overloads. The Almyra -
  Ricus line segment overloads to 114 and the
  Almyra - Dewitt line overloads to 108.
• Zero-contingency voltages along the Stuttgart -
  Helena line are sufficiently high, precluding
  installation of the capacitor bank for use during
  normal operation.
• Proposed Solution
• Solution involves tying the strong 230 kV source
  from Ritchie to the 115 kV line segment near
  Marvell, reducing the exposure to single
  contingency voltage issues.
• Estimated Cost 6,950,000

15
Jonesboro Area
16
Trumann - Harrisburg Tap 161 kV Line Rebuild

• Scenario
• Trumann Substation to Harrisburg Tap Switching
  Station is a 161 kV transmission line segment in
  the northeastern corner of Arkansas, near the
  load center of Jonesboro. The line segment is
  approximately 10.6 miles, and is currently rated
  for 148 MVA.
• Loss of the Newport Industrial - Newport 161 kV
  transmission line segment causes an overload on
  the Trumann - Harrisburg Tap line segment.
• The overload is projected to exceed 110 in the
  year 2004.
• Loss of the breaker-to-breaker line
  (Newport-Jonesboro) results in an overload of
  approximately 104 on the Trumann - Harrisburg
  Tap.
• Proposed Solution
• Rebuild the Trumann - Harrisburg Tap 161 kV line
  segment with a 666 mcm conductor, to increase the
  line rating to 247 MVA. Replace 600 amp line
  switches B0604 and B0290 (in the Truman
  Substation) with 1200 amp equipment.
• Estimated Cost 3,900,000

17
Emerson Area
18
345 / 115 kV Substation Construction (Mohawk)
near Emerson

• Scenario
• The following single contingencies cause low
  voltage in the extreme southwestern corner of the
  EAI service territory
• Loss of the Magnolia East - McNeil line segment,
  0.7349 p.u.
• Loss of the Magnolia Steel - Magnolia East line
  segment, 0.8469 p.u.
• Loss of the Magnolia Steel - Kerlin S.S. line
  segment, 0.8690 p.u.
• Capacitor bank additions do not provide
  sufficient improvement to this region.
• The transmission grid performance can be improved
  by delivering a high voltage source into the
  Emerson area. Emerson resides very close to a
  345 kV line from El Dorado to Longwood (SWEPCO).
  
• Proposed Solution
• A new substation is proposed to be constructed as
  a new tie between the two utilities.
• Estimated Cost 9,700,000

19
Datto - Jim Hill Area
20
Texas Station 8 Corning115kV Line Rebuild

• Scenario
• Previous construction has increased the conductor
  size on selected spans to 1590 mcm and 666 mcm,
  but a majority of the line is 336 mcm or smaller
  (e.g., 4/0 copper), and substation equipment
  limits the ampacity of the line.
• The voltage drop from TE 8 to Corning exceeds
  22 under certain single contingency scenarios.
• Low voltage also causes greater current to flow
  and will cause a 190 overload on the Corning to
  TE 8 line segment.
• Proposed Solution
• Rebuild the line segment from TE 8 to Corning
  with 666 mcm, to increase the line rating to 176
  MVA.
• Estimated Cost 7,600,000

21
Osage Creek-Grandview
22
Osage Creek-Grandview

• Scenario
• A single-contingency on the Eureka Springs -
  Osage Creek line segment causes thermal overloads
  at Harrison East - Harrison South-Harrison West.
  This contingency leaves over 100MW of load at
  Osage Creek on a long radial feed from Harrison
  East.
• Loss of this line also causes Osages voltage
  drop to 0.8986 p.u.
• Osage Creek will be rebuilt using breakers,
  switches and other equipment to accommodate three
  transmission lines. Eureka Springs and
  Berryville are two existing lines to Osage Creek
  and the third line will be new. It will be a 161
  kV line extending north.
• Proposed Solution
• There will be a new substation constructed at a
  new tap between Table Rock Dam-Beaver Dam on
  SPAs line.
• Estimated Cost 5,200,000

23
2006-2008 EAI Transmission Projects
1.) Mohawk - New 345 / 115 kV Substation near
Emerson (2005)
7.) Reconductoring of Mountain Pine South -
Blakely Dam 115 kV Line
2
3
4
2.) Reconductoring of Corning - Texas Eastern 8
115 kV Line (2005)
8.) New 115 kV Line Construction from Gum Springs
- Murfreesboro South
9
3.) New 161 kV Line Osage Creek -Grandview Line
(2005)
5
10
9.) Reconductoring of Morrilton East - Conway
West 161 kV Line
6
4.) New 161 kV Line Construction from Mountain
View to Silver Hill
7
10.) Reconductoring of Mabelvale - LR South 115
kV Line to 230 kV
8
5.) Reconductoring of NLR Levy - NLR Westgate 115
kV Line
11.) Reconductoring of El Dorado East - El
Dorado Jax 115 kV Line
11
Carryover
1
New Project
6.) Reconductoring of LR Pinnacle Walton
Heights 115kV Line
24
Mountain View Area
25
Mountain View - Silver Hill161 kV Line
Construction

• Scenario
• Mountain View is a served by a radial line from
  the Sage Switching Station.
• The Sage - Norfork Dam 161 kV Line segment is
  heavily loaded, and prone to overload when N.
  Arkansas hydroelectric output is deficient.
• Load at Mountain View continues to grow, in an
  area where alternate power is insufficient to
  meet the demand.
• Proposed Solution
• Constructing a new line from Silver Hill (near
  Marshall) to Mountain View will provide a new
  source of power to Mountain View, and will
  alleviate thermal constraints on the Sage -
  Norfork line.
• Estimated Cost 12,000,000

26
Greater Little Rock Area
27
NLR Levy - NLR Westgate115 kV Line Rebuild

• Scenario
• Loss of the LR Rock Creek - LR South 115 kV line
  segment causes overload to the NLR Levy - NLR
  Westgate 115 kV line segment (105)
• Proposed Solution
• Line will be rebuild with 1272 ACSR conductor.
• Estimated Cost 1,117,000

28
Greater Little Rock Area
29
LR Pinnacle - Walton Heights115 kV Line Rebuild

• Scenario
• Loss of the Kanis - Markham 115 kV line segment
  causes overload to the LR Pinnacle - Walton
  Heights 115 kV segment (103).
• Proposed Solution
• Line will be rebuilt with a larger conductor
  (e.g., 1272 mcm ACSR).
• Estimated Cost 2,160,000

30
Mountain Pine Area
31
Blakely Dam - Mountain Pine South115 kV Line
Rebuild

• Scenario
• Loss of the Carpenter Dam - Hot Springs South 115
  kV Line segment causes overload to the Mountain
  Pine - Blakely Dam segment.
• Line switches at the Blakely Dam prevent any
  greater throughput through the SPA substation.
• Conductor size will soon further limit power flow
  on this line segment (presently constructed with
  666 mcm conductor)
• Proposed Solution
• Line and switches should be upgraded to
  facilitate a minimum of 1200 amps (e.g., 1272
  ACSR)
• Estimated Cost 1,500,000

32
Curtis Area
33
New Switching Station (Gum Springs) and New 115
kV Line Construction

• Scenario
• The Woodward - Degray 115 kV transmission line
  crosses the Friendship - Couch 115 kV
  transmission line near Curtis, between
  Arkadelphia and Richwoods
• Connecting the two lines at their intersection
  would provide additional operational flexibility
  in the region south of HS and LR
• The new switching station would reduce to the
  exposure to single contingency voltage problems
  for several substations along both existing
  transmission lines
• Proposed Solution
• A new line constructed from Gum Springs to
  Murfreesboro South will provide another source of
  power to the Murfreesboro South region, where it
  is difficult to maintain sufficient voltage
  levels under single contingency scenarios
• Estimated Cost 8,400,000

34
Conway Area
35
Morrilton East - Conway West161 kV Line Rebuild

• Scenario
• Loss of the Lake Conway - Mayflower 115 kV line
  segment causes overload to the Morrilton East -
  Gleason 161 kV line segment (111) and the
  Gleason - Conway West 116 kV line segment (104)
• Loss of the Conway West - Lake Conway line
  segment and the Conway West 161 / 115 kV line
  segment cause smaller overloads
• Proposed Solution
• Rebuild the Morrilton East - Conway West 161 kV
  line segment
• Estimated Cost 6,120,000

36
Greater Little Rock Area
37
Mabelvale - Mann Road - Chico -LR Ind. - LR
South 115 kV Line Rebuild

• Scenario
• Loss of the Mabelvale - Alexander 115 kV line
  segment causes overload to the Mabelvale - Mann
  Road segment (109) and the Mann Road - Chico
  segment (106).
• Moving load from the existing 115 kV network in
  Little Rock to a future 230 kV loop will help
  facilitate greater power flow into and out of
  south Little Rock.
• Proposed Solution
• Line will be rebuilt, using conductor and
  insulators sufficient for future conversion to
  230 kV.
• Estimated Cost 4,000,000

38
Greater Little Rock Area
39
Mabelvale - Alexander - Hindman -LR South 115 kV
Line Rebuild

• Scenario
• Loss of the Mabelvale - Mann Road 115 kV line
  segment causes overload to the Mabelvale -
  Alexander segment (108).
• Loss of the Mann Road - Chico 115 kV line segment
  also causes overload to the Mabelvale - Alexander
  segment (107).
• Moving load from the existing 115 kV network in
  Little Rock to a future 230 kV loop will help
  facilitate greater power flow into and out of
  south Little Rock.
• Proposed Solution
• Line will be rebuilt, using conductor and
  insulators sufficient for future conversion to
  230 kV.
• Estimated Cost 4,500,000

40
El Dorado Area
41
El Dorado East - El Dorado Jax115 kV Line Rebuild

• Scenario
• Loss of the El Dorado EHV - Texas Eastern El
  Dorado 115 kV line segment causes overload to the
  El Dorado East - El Dorado Jax segment (106)
• Loss of the El Dorado Donan - Texas Eastern El
  Dorado 115 kV line segment also causes overload
  to the El Dorado East - El Dorado Jax segment
  (103)
• Proposed Solution
• Line will be rebuilt with 1272 ACSR conductor.
• Estimated Cost 1,000,000

42
2009 2013 Transmission Project Target Areas
1.) Conway Area
4.) Forrest City - Moses Area
2.) Little Rock Area
3
4
5.) Sheridan South Interface
1
2
3.) Parkin - Gilmore Area
5
Carryover
New Project
43

• Questions
• ????