Transcript No Slide Title

Entergy Arkansas, Inc.
Proposed Transmission
Projects
Entergy Transmission Planning Summit
New Orleans, LA
July 29, 2008
1
2008 EAI Transmission Projects
1.) Dewitt Capacitor
Bank Installation
2.) Maumelle East
Substation – Install
2nd 115 kV
Transmission Line
4.) Rison Substation
Upgrade Switch
Risers
3.) Little Rock 8th &
Woodrow and
Little Rock Boyle
Park Capacitor
Bank Upgrade
Little Rock Rock
Creek and Little
Rock West
Markham
Capacitor Bank
Installations
2
3
1
4
2
2009-2011 EAI Transmission Projects
1.) Gillette Capacitor
Bank Installation
5
3
2.) Pangburn
Capacitor Bank
Installation
3.) SMEPA Upgrades
2
4.) Magnolia 115 kV
Switching Station
6
1
5.) Grandview 161 kV
Substation
6.) Holland Bottoms
500/115 kV
Substation
4
3
Dewitt: 10.8 MVAR Capacitor Bank
2008
Scenario:
•
Loss of the Helena Industrial - Ritchie SES 115 kV line segment causes low
voltages at various substations
•
Loss of the Stuttgart Ricusky 230/115 kV autotransformer causes low voltages
at various substations and overloads on the Woodward – Altheimer and the
Altheimer – Wabbaseka 115 kV line segments
Proposed Solution:
•
Install a 10.8 MVAR capacitor bank at Dewitt.
• Correct Distribution power factor at Dewitt, Almyra, Marvell, Gillett, Helena Central,
and Ulm substations.
Estimated Cost: $800 K
4
Dewitt: 10.8 MVAR Capacitor Bank
Dewitt: Install 10.8
MVAR Capacitor
Bank
5
2008
Maumelle East: 2nd 115 kV Transmission Line
Scenario:
•
Significant load growth in the Maumelle area justified removing Maumelle
East from radial service.
•
The loss of the Maumelle East – Maumelle SS line results in a complete
outage to the Maumelle area.
Proposed Solution:
•
Tap the Maumelle SS to North Little Rock Levy 115kV Transmission line about
1 mile South of the Maumelle SS.
•
Construct a 115kV Transmission line from the new tap to Maumelle East.
•
The new 115kV Transmission line will be operated “Normally Open”
Estimated Cost: $4.5 M
6
Maumelle East: 2nd 115 kV Transmission Line
Maumelle East
Construct 2nd 115kV
Transmission Line
7
2008
Little Rock Capacitor Banks
Scenario:
•
For the past two summers, several stations in Little Rock observed voltages
as low as 91% of nominal with no significant contingencies.
•
The loss of one of the 500/115kV transformers at Mabelvale in 2006 resulted
in low voltages in the Little Rock area during periods where heavy flows to
the north were occurring.
•
A loss of the second transformer at Mabelvale (N-2) could result in
widespread low voltage in the Little Rock area.
Proposed Solution:
•
Prior to the Holland Bottoms 500/115kV Substation (formally known as Cabot
EHV), Upgrade the Capacitor Banks at Little Rock 8th and Woodrow and Little
Rock Boyle Park to 36 MVAR capacitor banks and install a 32.4 MVAR
capacitor bank at Little Rock Rock Creek and Little Rock West Markham.
Estimated Cost: $3 M
8
Little Rock Capacitor Banks
LR 8th & Woodrow
Upgrade Capacitor
Bank
LR West Markham
Install Capacitor
Bank
LR Boyle Park
Upgrade Capacitor
Bank
LR Rock Creek
Install Capacitor
Bank
9
2008
Rison Substation: Upgrade Switch Risers
Scenario:
•
The switch risers at Rison substation are a limiting factor on the Fordyce to
Woodward 115 kV Transmission line.
•
The risers on switches B0337 and B0837 were constructed using 4/0
conductor.
•
By upgrading the 4/0 risers, the limit on the Fordyce to Woodward line would
increase from 96 MVA to 119 MVA.
Proposed Solution:
•
Upgrade the 4/0 risers at Rison Substation on switches B0337 and B0837
•
In order to remove the jumpers, the power transformer will have to be
removed from service and a mobile transformer will have to be in place to
serve the load during the upgrades.
Estimated Cost: $100 K
10
Rison Substation: Upgrade Switch Risers
Rison Substation:
Upgrade Switch
Risers
11
Gillette: 10.8 MVAR Capacitor Bank
2009
Scenario:
•
Loss of the Helena Industrial - Ritchie SES 115 kV line segment causes low
voltages at various substations
•
Loss of the Stuttgart Ricusky 230/115 kV autotransformer causes low voltages
at various substations and overloads on the Woodward – Altheimer and the
Altheimer – Wabbaseka 115 kV line segments
Proposed Solution:
•
Install a 10.8 MVAR capacitor bank at Gillette.
• Correct Distribution power factor at Dewitt, Almyra, Marvell, Gillett, Helena
Central, and Ulm substations.
Estimated Cost: $850 K
12
Gillette: 10.8 MVAR Capacitor Bank
Gillette: Install 10.8
MVAR Capacitor
Bank
13
Pangburn: 36 MVAR Capacitor Bank
2010
Scenario:
•
Rutherford 161kV Substation has a 36 MVAR capacitor bank that the TOC can
not switch during contingency events due to the large voltage swing caused
by the capacitor bank.
•
Without the Rutherford capacitor bank, loss of the Independence to Newark
161 kV line segment causes low voltages at various substations along the
Independence to Searcy Price line.
Proposed Solution:
•
Remove the 36 MVAR capacitor Bank at Rutherford and move it to the
Pangburn 161 kV Substation
Estimated Cost: $500 K
14
Pangburn: 36 MVAR Capacitor Bank
Rutherford: Remove
36 MVAR Capacitor
Bank
Panburn: Install 36
MVAR Capacitor
Bank
15
SMEPA To Plum Point Upgrades
2010
Scenario:
•
SMEPA requested long term transmission service from Plum Point Unit 1 under
Entergy’s OATT.
Proposed Solution:
•
In order to remove the violation caused by the Transmission Service Request,
the following upgrades must be made:
– Re-conductor Dell to AECC Manila 161 kV Transmission Line
– Re-conductor AECC Manila to Monette 161 kV Transmission Line
– Re-conductor Jonesboro North to Paragould South 161 kV Transmission Line
– Re-Conductor Jonesboro to Jonesboro North 161 kV Transmission Line
Estimated Cost: $22 M
16
SMEPA To Plum Point Upgrades
Upgrade 161 kV
Transmission Line
from Jonesboro North
to Paragould South
Upgrade 161 kV
Transmission Line
from AECC Manila to
Monette
Upgrade 161 kV
Transmission Line
from Jonesboro to
Jonesboro North
Upgrade 161 kV
Transmission Line
from Dell to AECC
Manila
17
Magnolia 115 kV Switching Station
2011
Scenario:
• The loss of the McNeil to Magnolia East 115kV line segment causes low
voltages at Magnolia East, Magnolia Steel, Kerlin and Emerson with the lowest
voltage at Magnolia East. The Taylor to Springhill line may overload to 120%.
•
With the Sarepta project in service. the scenario is improved but some low
voltage in the area remain.
Proposed Solution:
• Construct a switching station in Magnolia where the 115kV lines of Magnolia
East to Magnolia Steel and Magnolia South to Shuler cross.
Estimated Cost: $3.5 M
18
Magnolia 115 kV Switching Station
Magnolia Switching
Station
19
Grandview 161 kV Substation
2011
Scenario:
•
By 2010 it is estimated that approximately 227 MW of load will be served
between Harrison East and Eureka Springs.
•
Nearly 110 MW of the load will be located at Osage Creek, at the extreme
northwest end of the line.
•
Loss of the Harrison East – Harrison South transmission line segment causes
thermal overloads by as much as 7% on the Eureka – Osage Creek (AECC)
line segment.
•
Loss of this line also causes depressed voltage at Osage Creek.
Proposed Solution:
•
Construct a new switching station, Grandview, on the transmission line from
Table Rock Dam – Eureka Springs. Build a new line between Grandview and
Osage Creek.
Estimated Cost: $6 M
20
Grandview 161 kV Substation
Grandview
21
Holland Bottoms 500/115kV Substation
(Formally Cabot EHV)
2011
Scenario:
•
For the past two summers, several stations in Little Rock observed voltages
as low as 91% of nominal with no significant contingencies.
•
The loss of one of the 500/115kV transformers at Mabelvale in 2006 resulted
in low voltages in the Little Rock area during periods where heavy flows to
the north were occurring.
•
A loss of the second transformer at Mabelvale (N-2) could result in
widespread low voltage in the Little Rock area.
Proposed Solution:
•
Construct a 500/115kV substation near Cabot Northeast of Little Rock. This
will provide voltage support to Little Rock and reduce some thermal
contingencies.
Estimated Cost: $60 M
22
Holland Bottoms 500/115kV Substation
(Formally Cabot EHV)
Holland Bottoms
500/115 kV
Substation
23
Transmission System Target Areas
2012 and Beyond
1.) Norfork – Bull Shoals
161 kV Re-Conductor
2.) Mt View – Hilltop 161
kV Transmission Line
3.) Russellville Area
Improvements
4.) Corning – Texas
Eastern ReConductor 115kV
Transmission Line
5.) Holland Bottoms –
Gold Creek 161 kV
Transmission Line
6.) Little Rock ReConductor 115kV
Transmission Lines
4
1
2
7.) Hot Springs ReConductor 115kV
Transmission Lines
3
5
6
7
9
8
8.) Gumsprings 115
kV Switching
Station
9.) Gobel 230/115 kV
Substation
10.) El Dorado Area
Improvements
10
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