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Entergy Arkansas, Inc. Proposed Transmission Projects

Entergy Arkansas, Inc. Proposed Transmission Projects. Entergy Transmission Planning Summit New Orleans, LA August 11, 2009. 2009 EAI Transmission Projects. 1) Gillette: Install 10.8 MVAR Capacitor Bank 2) Donaghey to Conway South: Upgrade Line

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Entergy Arkansas, Inc. Proposed Transmission Projects

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  1. Entergy Arkansas, Inc.Proposed TransmissionProjects Entergy Transmission Planning Summit New Orleans, LA August 11, 2009

  2. 2009 EAI Transmission Projects 1) Gillette: Install 10.8 MVAR Capacitor Bank 2) Donaghey to Conway South: Upgrade Line 3) Hamlet: Install Breaker on Conway Industrial Line 4) Danville: Upgrade Terminal Equipment 2, 3 4 1

  3. 2010-2012 EAI Transmission Projects 1 1) Osage Creek – Grandview: New Line 2) Transmission Service - OG&E 3) Holland Bottoms: Construct 500/161/115 kV Substation 4) Transmission Service - Aquila 5) Warren East: Install 10.8 MVAR Capacitor Bank 7 6 6) Transmission Service – SMEPA 7) Melbourne to Sage 161kV: Upgrade Line 2 3 4 5

  4. 2010-2012 EAI Transmission Projects 1) Harrison to Everton Road: Replace Switches and Line Trap 2) Transmission Service – Westar 3) Jonesboro to Hergett: Upgrade 161kV Line 4) Ebony Switching Station: Convert to a Breaker Station 5) Beebe: Install 21.6 MVAR Capacitor Bank 1 2 3 6) Holland Bottoms to Hamlet: Construct New 161 kV Line 7) Benton North to Benton South: Construct New 115 kV Line 8) Mt Ida: Install 10.8 MVAR Capacitor Bank 9) Sarepta: Emerson Install a 10.8 MVAR Capacitor Bank 4 5 6 7 8 9

  5. Gillette: Install 10.8 MVAR Capacitor Bank 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. Proposed In Service Date: Summer 2009

  6. Gillette: Install 10.8 MVAR Capacitor Bank Gillette: Install 10.8 MVAR Capacitor Bank

  7. Donaghey to Conway South: Upgrade Line& Hamlet: Install Breaker on Conway Industrial Line Scenario: • Loss of the Helena Industrial - Ritchie SES 115 kV line segment causes low voltages at various substations • Loss of the Pleasant Hill - Quitman 161 kV line segment causes an overload on the Conway West to Donaghey and Donaghey to Conway South 161kV transmission line sections. The Conway West - Donaghey line has been upgraded. • The Pleasant Hill – Quitman line and the Morrilton East to Quitman line are subjected to unanticipated transactions which tend to overload the Morrilton East to Quitman line for the loss of the Pleasant Hill to Quitman line. Proposed Solution: • Re-conductor Donaghey – Conway South • Install a breaker at Hamlet Switching Station to remove the overloads caused by the loss of Pleasant Hill – Quitman. This is an interim measure until a line can be constructed from Holland Bottoms to Hamlet in 2012. Proposed In Service Date: Winter 2009

  8. Donaghey to Conway South: Upgrade Line& Hamlet: Install Breaker on Conway Industrial Line Donaghey to Conway South: Upgrade Line Hamlet: Install Breaker on Conway Industrial Line

  9. Danville: Upgrade Terminal Equipment Scenario: • Loss of ANO - Fort Smith 500kV Transmission line causes overloads on the Danville-Magazine, and Magazine-North Magazine line sections. • The loss of the 500 kV line causes the flow to utilize the underlying network to transfer power to the neighboring utilities. Proposed Solution: • Upgrade Danville bus section, switches and line trap. • Danville to North Magazine re-conductor. This has been completed. Proposed In Service Date: Fall 2009

  10. Danville: Upgrade Terminal Equipment Danville: Upgrade Substation Equipment

  11. Osage Creek – Grandview: New Line Scenario: • By 2010 it is estimated that approximately 227 MW of load will be served between Harrison East and Eureka Springs. • 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 key load centers. 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. Proposed In Service Date: 2011

  12. Osage Creek – Grandview: New Line Grandview 161 kV Substation Grandview – Osage Creek 161 kV Line: Construct New Line

  13. Supplemental Upgrades - OG&E Scenario: • Supplemental upgrades for OG&E Proposed Solution: • ANO - Russellville N 161 kV: Line Upgrade • Russellville E - Russellville S 161 kV: Line Upgrade • ANO EHV Substation: Upgrade Switch • Russellville N 161 kV Substation: Upgrade Switch • Russellville E 161 kV Substation: Upgrade Switch • Russellville S 161 kV Substation: Upgrade Switch Proposed In Service Date: Winter 2010

  14. Supplemental Upgrades - OG&E Re-Conductor the 161 kV Transmission Line fromANO to Russellville North Re-Conductor the 161 kV Transmission Line from Russellville East to Russellville South

  15. Holland Bottoms: Construct 500/161/115 kV Substation 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 500/115 kV 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. Proposed In Service Date: 2011

  16. Holland Bottoms: Construct 500/161/115 kV Substation Holland Bottoms 500/161/115 kV Substation

  17. Transmission Service - Aquila Scenario: • Aquila Transmission Service (Base Funded) Proposed Solution: • Project definitions will be completed for the following Base Plan Projects: • Hot Springs EHV to Bismarck 161kV T-line upgrade • Bismarck to AECC Alpine 161 kV T-line Upgrade • AECC Alpine to Amity Tap 161 kV T-line Upgrade • Bismarck Substation Upgrades Proposed In Service Date: 2011

  18. Transmission Service - Aquila Re-Conductor the 115 kV Transmission Line from Bismarck to AECC Alpine Re-Conductor the 115 kV Transmission Line fromHot Springs EHV to Bismarck Re-Conductor the 115 kV Transmission Line fromAECC Alpine to Amity SS

  19. Warren East: Install 10.8 MVAR Capacitor Bank Scenario: • The Warren East is a substation which is located in southeastern Arkansas, northeast of El Dorado. This is a long radial line fed from Monticello East and El Dorado EHV which is approximately 61 miles. Loss of any of the line segment along this line causes voltages to dip below 90%. Also, voltages in this area drop during the loss of the 500/115 kV at El Dorado EHV. Proposed Solution: • Install a 10.8 MVAR capacitor bank to the operating bus at the Warren East substation. Proposed In Service Date: 2012

  20. Warren East: Install 10.8 MVAR Capacitor Bank Warren East: Install 10.8 MVAR Capacitor Bank

  21. Transmission Service - SMEPA Scenario: • SMEPA transmission service (Base Funded). Proposed Solution: • Upgrades required for transmission service: • 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 Proposed In Service Date: Summer 2010

  22. Transmission Service - SMEPA Re-Conductor the 161 kV Transmission Line from Jonesboro North to Paragould South Re-Conductor the161 kV Transmission Line from AECC Manila to Monette Re-Conductor the 161 kV Transmission Line from Jonesboro to Jonesboro North Re-Conductor the161 kV Transmission Line from Dell to AECC Manila

  23. Melbourne to Sage 161kV: Upgrade Line Scenario: • The following contingencies cause the Melbourne to Sage 161kV line segment to overload in the Winter 2010 Planning Models: • Loss of ANO to Fort Smith 500kV • Loss of ISES to Dell 500kV • Newport to Jonesboro 161kV Proposed Solution: • Re-conductor the Melbourne to Sage 161kV Transmission line segment to a minimum of 1200 Amps. Proposed In Service Date: Winter 2010

  24. Melbourne to Sage 161kV: Upgrade Line Re-Conductor the 161 kV Transmission Line from Melbourne to Sage

  25. Harrison East to Everton Road:Replace Switches and Line Trap Scenario: • Harrison East to Hilltop has a limited of 167 MVA due to breaker B4836 switches at Harrison East and the line trap at Harrison East. The switches are currently rated at 600 Amps and the line trap is rated for 600 Amps. BY upgrading the switches and line trap the line rating will increase from 167 MVA to 223 MVA. Proposed Solution: • Install 2 sets of switches at Harrison East on breaker B4836. The new switches need to be rated no less than 1200 Amps. • Install a new line trap at Harrison East with a rating no less than 1200 Amps. Proposed In Service Date: 2011

  26. Harrison to Everton Road: Replace Switches and Line Trap Harrison East: Replace switches and line trap on the Everton Road 161 kV Transmission Line

  27. Transmission Service - Westar Scenario: • Transmission Service Proposed Solution: • Re-conductor the Monette to Paragould 161 kV (Base Funding) Transmission line segment to at least 246 MVA. • Upgrade the switch B6673 at Paragould substation from 600 A to 2000 A • Russellville South 161 kV Substation – Upgrade Dardanelle Dam Line Terminal Equipment (Supplemental Funding) – Proposed upgrade to 416 MVA rating Proposed In Service Date: 2012

  28. Transmission Service - Westar Re-Conductor the 161 kV Transmission Line from Paragould to Monette Upgrade Switch B6673 Re-Conductor the 161 kV Transmission Line from Russellville South to Dardanelle Dam

  29. Jonesboro to Hergett: Upgrade 161 kV Line Scenario: • The loss of Jonesboro to Jonesboro SPA causes the Jonesboro to Hergett 161 kV Transmission Line segment to overload. Also the loss of the Marked Tree to Harrisburg Tap 161 kV Transmission Line segment causes the Jonesboro to Hergett 161 kV Transmission Line segment to overload. Proposed Solution: • Re-conductor the Jonesboro to Hergett 161 kV Transmission line segment to at least 240 MVA. Proposed In Service Date: 2012

  30. Jonesboro to Hergett: Upgrade 161 kV Line Re-Conductor the 161 kV Transmission Line from Jonesboro to Hergett

  31. Ebony Switching Station: Convert to a Breaker Station Scenario: • The loss of West Memphis EHV to West Memphis Polk causes low voltages at WM Polk and WM Lehi. To prevent this, Ebony SS will be converted to a breaker station. • Ebony SS ties together Kuhn Road, WM Gateway, Marked Tree, WM Lehi and WM Polk. The current configuration has Marked Tree to WM Lehi bypassing the switching station. This also prevents a creation of an operational guide for the TOC to remove the low voltages condition if an event should occur. Proposed Solution: • Convert Ebony SS to a 5 breaker station (Single Bus Single Breaker Scheme). Additional land may need to be purchased. Proposed In Service Date: 2012

  32. Ebony Switching Station: Convert to a Breaker Station Ebony SS: Convert Ebony SS to a Ring Bus

  33. Beebe: Install 21.6 MVAR Capacitor Bank Scenario: • The loss of the Cabot to Ward 115 kV Transmission line segment causes low voltages along line 937. Line 937 breaker to breaker is from Jacksonville North to Searcy Price. Since there is a capacitor bank at Cabot, the loss of Jacksonville to Cabot is not as severe. The Cabot capacitor bank is 32.4 MVAR (30.53 MVAR at 115 kV). Proposed Solution: • Install a 21.6 MVAR, 115 kV capacitor bank at Beebe Substation. Proposed In Service Date: Winter 2010

  34. Beebe: Install 21.6 MVAR Capacitor Bank Beebe: Install 21.6 MVAR Capacitor Bank

  35. Holland Bottoms - Hamlet: Construct New 161 kV Line Scenario: • The loss of the 161 kV transmission line from Pleasant Hill to Quitman causes an overload on the Conway West to Donaghey and Donaghey to Conway South 161 kV transmission line sections. There are two 161 kV transmission lines that push power to North/Northwest Arkansas due to daily and long term/firm transactions. One of the lines runs through the City of Conway (Morrilton East to Quitman) and the other is north of Conway (Pleasant Hill to Quitman). When the Pleasant Hill to Quitman line trips the Morrilton to Conway West to Quitman line now has to handle not only the load in the Conway area but the transactions flowing North. Proposed Solution: • Convert Hamlet SS to a breaker station (Single Bus Single Breaker Scheme) • Move the Quitman line from Gold Creek to Hamlet SS • Move the Gravel Ridge line from Gold Creek to Hamlet SS • Construct a line from Hamlet SS to Holland Bottoms with a rating no less than 1200 Amps Proposed In Service Date: 2012

  36. Holland Bottoms to Hamlet: Construct New 161 kV Line Hamlet: Convert to a breaker station Construct a new 161 kV Transmission Line from Holland Bottoms to Hamlet Holland Bottoms

  37. Benton North - Benton South:Construct New 115 kV Line Scenario: • The loss of Mabelvale to Bryant 115kV Transmission Line segment causes on overload on the Hot Springs EHV to Butterfield line section and low voltages at Benton South, Bryant and Alcoa Road substations. Proposed Solution: • Convert Benton South SS to a breaker stations (Single Bus Single Breaker Scheme) • Convert Benton North SS to a breaker stations (Single Bus Single Breaker Scheme) • Construct a line from Benton South to Benton North • The new line needs to be rated to at least 170 MVA Proposed In Service Date: 2012

  38. Benton North to Benton South:Construct New 115 kV Line Benton North SS: Convert to a breaker station Construct a new 115 kV Transmission Line from Benton North to Benton South Benton South SS: Convert to a breaker station

  39. Mt Ida: Install 10.8 MVAR Capacitor Bank Scenario: • The loss of Hot Springs to Bismarck 115 kV Transmission line segment causes low voltages along the Hot Springs EHV to Murfreesboro 115 kV Transmission Line. The source from the South, SWEPCO's area, is not strong enough to support the load on this line. Proposed Solution: • Install a 10.8 MVAR Capacitor Bank at Mt Ida Substation. Proposed In Service Date: 2011

  40. Mt Ida: Install 10.8 MVAR Capacitor Bank Mt Ida: Install 10.8 MVAR Capacitor Bank

  41. Sarepta: Emerson Install a 10.8 MVAR Capacitor Bank Scenario: • With the forecasted 2008 summer peak load model, a single contingency analysis was performed in the ELL-North-West area with and without the potential load additional of 28 MW at the new substation close to Arcadia. Proposed Solution: • Install a 345/115kV Auto at the Serepta 115 kV substation • Install a 10.8 MVAR capacitor bank at Emerson • Install a 32.4 MVAR cap bank at Lucky • Install a 32.4 MVAR cap bank at Vienna Proposed In Service Date: 2011

  42. Sarepta: Emerson Install a 10.8 MVAR Capacitor Bank Emerson: Install 10.8 MVAR Capacitor Bank

  43. Transmission System Target Areas 2013 and Beyond 9) Lake Village Bagby to Macon Lake: Upgrade 115 kV Line 10) Mayflower to Morgan: Upgrade 115 kV Line 11) Russellville East to Russellville North: Upgrade 161 kV Line 12) Camden North to Camden McGuire: Construct a 115 kV Line 13) Poyen: Install a 10.8 MVAR Capacitor Bank 14) El Dorado Upland to Texas Eastern F: Construct 115 kV Line 15) Gobel: Construct 230/115 kV Substation 1) Little Rock Re-Conductor 115 kV Transmission Lines 2) Norfork – Sage: Upgrade 161 kV Line 3) Bull Shoals to Midway: Upgrade 161 kV Line 4) Gum Springs: Construct Switching Station 5) Gum Springs to Amity: Construct 115 kV Line 6) Holland Bottoms to Ward: Construct 2nd 115 kV Line 7) Jim Hill to Datto: Convert 115 kV Line to 161 kV Or Construct a New 161 kV Line 8) Jonesboro: Construct a 500/161 kV Substation 7 3 2 8 11 6 10 1 13 15 5 4 12 9 14

  44. Entergy Mississippi, Inc.Proposed Transmission Reliability Projects Transmission Planning Summit

  45. 2010 - 2012 EMI Transmission Reliability Projects Horn Lake: Energize Auto & Upgrade Horn Lake – TH Allen161kV Line 2011 Getwell 230/115kV Auto & Getwell-Hernando 230kV Line (Operate at 115kV) 2013 Grenada/Winona/Greenwood Area Improvement 2010 & 2012 McAdams 500/230kV Auto & Upgrade McAdams-Pickens 230kV Line 2011 Indianola-Greenwood 115 kV 2010 Ray Braswell -Byram 115kV Line 2013 Ridgeland - Madison Reliability Improvement 2011-12 Install 500/115kV Auto at Baxter Wilson 2012 South Jackson – Florence 115kV Line Upgrade & Switches at Morton 2010 Waterways – E. Vicksburg 115kV Line Upgrade 2011 Florence - Star 115kV Line Upgrade 2011 UpgradeBreakers and Switches at Baxter Wilson and Ray Braswell 2010 Upgrade Switches at Magee 2010

  46. Indianola-Greenwood Line Upgrade Scenario: • The Indianola - Greenwood 115KV line, located in central Mississippi, is approximately 28 miles long and is limited to a rating of 120 MVA by equipment in the Moorhead, Itta Bena, and Greenwood substations. • Loss of several sections including Pickens-Durant, Durant-Bowling Green, Attala-Kosciusko and Delta-Ruleville causes the Indianola-Moorhead section to overload. Recommended Solution: • Replace the limiting substation equipment and increase the rating of the line to 161 MVA. Proposed In Service Date: Winter 2010

  47. Indianola-Greenwood Line Upgrade Greenwood 115 kV Substation: Upgrade Substation Equipment Itta Bena 115 kV Substation: Upgrade Substation Equipment Moorhead 115 kV Substation: Upgrade Substation Equipment

  48. Upgrade Switches at Magee Substation Scenario: • Entergy and SMEPA have a tie at Magee substation through two 161/115 kV, 150 MVA transformers. • SMEPA has replaced the transformers with 336 MVA transformers to increase the contract path with Entergy. The switches on the 115kV side limits the new contract path limit to 480 MVA. Recommended Solution: • Replace the existing switches to increase the tie capability to full value (672 MVA) of the new transformers. Proposed In Service Date: Winter 2010

  49. Upgrade Switches at Magee Substation Magee 115 kV Substation: Upgrade Substation Equipment

  50. Upgrade Florence-South Jackson Line & Switches at Morton Substation Scenario: • TVA requested transmission service across Entergy’s transmission system from TVA to TVA. The transfer causes various lines to overload for a single contingency. • Florence-South Jackson, Morton-Pelahatchie and Morton-West Forest (SOCO) 115kV lines overloads for the loss of Choctaw-WestPoint (TVA) 500kV line. Recommended Solution: • Re-conductor Florence-South Jackson line and increase the rating of the line to at least 183 MVA. • Upgrade switches at Morton substation (from 600Amps to 1200 Amps) to increase the rating of Morton-Pelahatchie and Morton-West Forest (SOCO) lines to 176MVA and 154 MVA respectively. Proposed In Service Date: Summer 2010

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