ICT Strategic Transmission Expansion Plan (ISTEP) Report. ICT Planning

Transcription

1 ICT Strategic Transmission Expansion Plan (ISTEP) Report ICT Planning PUBLISHED: 12/04/2007

2 Table of Contents Table of Contents...1 I. Executive Summary...2 II. Objectives...4 III. A. Improving Load-Serving Capability...4 B. Improving Inter-Regional Transfer Capability...4 C. Improving Load Pockets/Load Centers...4 D. Relieving Constraining Flowgates...4 System Overview...5 A. Current Issues on the Entergy Transmission System...5 IV. Study Assumptions...10 A. Modeling Assumptions...10 V. Proposed Upgrade Discussion...12 VI. VII. A. Overview of Proposed Upgrades...12 B. Amite South Upgrades...13 C. Acadiana Upgrades...16 D. Monroe Area 230 kv...20 E. Southeast Arkansas 230 kv...22 F. Ozarks EHV...24 G. South LA Bulk...28 H. Western Region...30 I. Northwest LA Bulk...32 J. South MS 230 kv...34 K. SOCO/SMEPA Interface Improvement...36 L. North LA 230 kv...38 M. Northshore 230 kv...40 N. North MS Bulk...41 O. Central Arkansas 230 kv...43 P. Brinkley East...47 Q. Central Arkansas Bulk...48 R. Jackson Area...50 S. Central MS Bulk...52 T. Short-term Project: McAdams Series Reactor...54 U. Short-term Project: Mt. Olive Hartburg Series Compensation...55 Summary...56 Next Steps...61 A. Stakeholder Input...61 B. Proposed Timeline...62 December 5,

3 I. Executive Summary On November 17, 2006 the ICT initiated its duties laid out in Attachment A of the ICT Agreement and further defined in Attachments S and T of Entergy s OATT. The ICT has developed the ICT Strategic Expansion Plan (ISTEP) recognizing that a long-term analysis is needed to encourage transmission expansion on the Entergy transmission system beyond the three-year window provided by Attachment T. Section 3.2 of Attachment T states: The ICT will assess whether a proposed upgrade should be considered a Base Plan Upgrade or Supplemental Upgrade. For purposes of this Section 3.2, the ICT will consider only upgrades in the then-current Base Plan for which construction is to be initiated within the next 3 years. The Attachment S language, relocated to Attachment K due to modifications imposed by FERC Order 890, provides additional guidance in the development of transmission expansion projects. Another duty of the ICT, as outlined in Section 14 of Entergy s proposed Attachment K, is that of identifying potential economic upgrades. Section 14 of Attachment K states: The ICT will identify such upgrades based on screening criteria, which may include considerations such as frequent transmission loading relief events, frequently constrained flowgates in the Available Flowgate Capability process or the Weekly Procurement Process (WPP), flowgates with high congestion costs as identified in the WPP process, and commonly invoked must-run operating guides. The projects identified in the ISTEP are proposed outside the scope of the ICT Base Plan. The expectation is that such facility upgrades will provide reliability and economic benefits to Entergy transmission system users. The ISTEP is not an evaluation Entergy Transmission System compliance with NERC Transmission Planning Standards, which allow for the use of operating guides, redispatch, breaker operation, or other mitigation plans. These mitigation plans have not been taken into account in this analysis. The 2015 Summer Peak Model is the basis for this analysis which will be further referred to as the ISTEP Phase 1. A primary purpose of this Plan is to promote EHV expansion on the Entergy transmission system by identifying problem areas and developing long-term strategic solutions. This first phase was developed using thermal and voltage analysis tools in PSS/E, MUST, and Powerworld software. Phase 1 of the ISTEP has been developed and is presented herein. The areas of focus in this first phase are the following: Improving Load-Serving Capability, Improving Inter- Regional Transfer Capability, Improving Load Pockets/Load Centers, and Relieving Constraining Flowgates. December 5,

4 Twenty ISTEP projects are presented in this report, with each consisting of one or more transmission system upgrades. These projects are grouped by geographic area, and focus on creating new, higher-voltage transmission in order to address system expansion and performance needs on the Entergy Transmission System, as opposed to upgrading the underlying lower-voltage systems. Because of the high-level nature of this Plan, no cost estimates or proposed in-service dates are provided in phase I. The ISTEP is being presented at a high-level in this document, with the intent that it will be further developed with the input from interested parties in the coming months. The ICT welcomes feedback from interested parties on this plan, and feedback mechanisms and timelines are discussed in Part VII of this report. December 5,

5 II. Objectives The ISTEP was created with several key objectives driving the projects that compose the Plan. Those objectives are: Improving Load-Serving Capability, Improving Inter- Regional Transfer Capability, Improving Load Pockets/Load Centers, and Relieving Constraining Flowgates. These objectives combine in order to provide a more robust transmission system that is capable of both reliable service and the economic delivery of power across the transmission system. Each objective is discussed in further detail below. A. Improving Load-Serving Capability The ISTEP projects are designed to enhance the reliability of the transmission system by improving its ability to serve load. The upgrades accomplish this task by providing increased voltage, increased thermal capacity, and additional paths from the generation to the load. B. Improving Inter-Regional Transfer Capability The Entergy Transmission System interfaces with 19 control areas, including both SERC and SPP members. The ISTEP includes projects that improve the ability to move power between Entergy and neighboring systems. C. Improving Load Pockets/Load Centers The Entergy Transmission System has several recognized load pockets. These are areas of high load, with limited local generation, and are dependent upon transmission lines in order to move power into the area. Several of the load pockets on the Entergy Transmission System have generation that is designated as must-run, dependent upon system conditions. One focus of the ISTEP is to increase the import capability into these load pockets, such that generation must-run requirements within those areas can be relaxed or removed improving reliability and economics. D. Relieving Constraining Flowgates Under certain system conditions, flowgates can become constrained during real-time operations. When this occurs, the ICT will institute congestion management procedures, often in the form of Transmission Loading Relief (TLR). TLR procedures have a number of levels, and can result in the curtailment of non-firm and/or firm transmission service. In addition to the operational issues, there are a number of flowgates that frequently constrain the sale of transmission service. The ISTEP includes upgrades that are intended to address some of the current most constraining flowgates, from both a TLR and a transmission service perspective. December 5,

6 III. System Overview A. Current Issues on the Entergy Transmission System 1. Operational Limitations TLR s are used to curtail transmission service and help prevent instability, uncontrolled separation, or cascading outages. NERC prescribes eight levels of TLR s. The higher the level of the TLR, the more critical the potential problem on the transmission system is. Actions taken by the ICT Reliability Coordinator on TLR s level one through four include curtailment or holding of Non-Firm transmission service. Reallocation, curtailment or holding of firm transmission service occurs when TLR s reach levels five or above. The ICT, as the Reliability Coordinator for the Entergy Transmission System, has called 213 TLRs, resulting in the curtailment of 340,181 MWh of Firm and Non Firm transmission service between January and October of A breakdown of the MWhs curtailed, by month, is displayed below in Table 1. Table 2 displays the number of TLR events, by level. Month (2007) Firm Non Firm Total Jan Feb Mar April May June July Aug Sept Oct Nov n/a n/a n/a Dec n/a n/a n/a Total 49, , ,181 Table 1 - TLR Monthly MWh Curtailed December 5,

7 Month (2007) Level One Level Two Level Three Level Four Level Five Jan Feb Mar April May June July Aug Sept Oct Nov n/a n/a n/a n/a n/a Dec n/a n/a n/a n/a n/a Total Table 2 - Total TLR Monthly Number of Events by Level December 5,

8 The 213 TLR events in 2007 were called on 37 flowgates. Those flowgates are listed below. Flowgate Description Adams Creek-Bogalusa3 230kV FTLO Adams Creek-Bogalusa2 Addis-Tiger 230kV for loss of Dow Meter Point-Air Liquid Tap 230kV Addis-Tiger 230kV FTLO BigCajun-Webre500kV Baxter Wilson-Ray Braswell FTLO Grand Gulf-Franklin Brookhaven-Wesson FTLO Grand Gulf-Baxter Wilson 500KV Byram-Terry 115KV FTLO Grand Gulf-Franklin 500KV Cecelia-Moril 138 kv for loss of Flanders-Hopkins 138 kv Coly-Vignes for loss of Willow Glen-Waterford Conway- Donaghey 161KV FTLO Pleasant Hills-Greenbrier 161KV El Dorado-Sheridan 500KV FTLO McNeil-Etta 500KV Fancy Auto 500/230kv (flo) McKnight-Coly 500kv Hartburg-Inland Orange 230 KV FTLO Hartburg-Cypress 500KV Hot Springs-Bismarck 115KV FTLO Dolet Hills-SWShreveport 345KV Hot Springs-Bismarck for loss of El Dorado-Longwood Keo - West Memphis 500kv (flo) Shelby - Dell 500kv Mabelvale-Bryant for the loss of Sheridan - El Dorado Mabelvale-Sheridan for loss of White Bluff-Sheridan Mabelvale - Bryant 115kv (flo) White Bluff Sheridan 500kv Mayflower-Morgan 115 ftlo Mayflower-Sylvan Hills 115 McAdams for loss of McAdams-Lakeover Meaux-Judice 138KV FTLO Flanders-Hopkins 138KV Morrilton East-Gleason 161 kv ftlo Pleasant Hills-Mayflower 500 kv Mt. Olive - Hartburg for the loss of Webre - Wells Nelson 500/230 XFMR T1 ftlo Hartburg-Cypress 500 kv Nelson-Lake Charles Bulk 138kV 1 FTLO Nelson-Lake Charles Bulk 138kV 2 Ray Braswell 500/115 AT1 FTLO Ray Braswell-Lakeover 500KV Richard - Colonial Academy 138 Russellville E-Russellville S 161kV FTLO ANO-FT. Smith 500kV Scott-Bonin 138 kv for loss of TJ Labbe-Bonin 230 kv Terrebonne-Greenwood for loss of Webre-Wells Thomas-Louisiana Station 138 kv ftlo Webre-Wells 500 kv White Bluff-KEO 500KV FTLO Sheridan-Mabelvale 500KV White Bluff-Keo 500KV FTLO Wrightsville-Keo 500KV White Bluff-Sheridan for loss of Mabelvale-Sheridan Wilbert-Livonia for loss of Webre-Wells Willow Glenn-Addis 138KV FTLO Webre-Wells 500KV Willow Glen AT2 500/230 (flo) Fancy AT1 500/230 Table 3 - Flowgates Having TLR Events Transfer Capability Limitations Short-term transmission service is evaluated through the Available Flowgate Capacity system, which determines what capacity is available on a select list of flowgates. There are a number of these flowgates which are more limiting to service than others. The table below illustrates which flowgates are most limiting to transmission service. This December 5,

9 list is based on AFC Logs from 10/1/06 to 10/1/07. A flowgate is counted as a limit if any time point of any Top 15 flowgate did not have the full capacity available. Flowgate # Flowgate Description SCBSEM_WLPNT 2304 Scott-Semere 138 Ftlo Wells-Pont Des Mouton 230 SCBSEM_PNTBO 2185 Scott-Semere 138 Ftlo Pont Des Mouton-Bonin 230 NRCSCB_WLPNT 1873 North Crowley-Scott 138 Ftlo Well-Pont Des Mouton 230 RAYBAX_GGFRA 1799 Baxter Wilson-Ray Braswell 500 Ftlo Grand Gulf-Franklin MCADXF_LAKOV 1565 McAdams 500/230 Ftlo McAdams-Lakeover 500 BONCEC_RICCO 1495 Bonin-Cecelia 138 Ftlo Richard-Colonial Academy 138 BONXF_FLNHPK 1388 Bonin 230/138 Ftlo Flanders-Hopkins 138 SCBBON_WLPNT 1075 Scott-Bonin 138 Ftlo Wells-Pont Des Mouton 230 Nelson-Lake Charles Bulk 138 #1 Ftlo Nelson-Lake Charles Bulk 138 #2 NELLC_NELLCB 1010 LASTHM_WEBWL 885 Thomas-La. Station 138 Ftlo Webre-Wells 500 DODDAN_HARMT 830 Dodson-Danville 115 Ftlo Mt. Olive-Hartburg 500 TBOGRN_WEBWL 694 Terrebonne-Greenwood Ftlo Webre-Wells 500 BONXF_RICSCB 692 Bonin 230/138 Ftlo Richard-Scott 138 SCBSEM_WELXF 655 Scott-Semere 138 Ftlo Wells 500/230 AMRN_TIECAPE 528 Export Limit For Amrn Interface GRIMTZ_WDN 514 Grimes-Mt. Zion 138 Ftlo Grimes-Walden 138 NCRSCB_RICHR 488 North Crowley-Scott 138 Ftlo Richard-Scott 138 MTOHTB_WEBWL 479 Mt. Olive-Hartburg 500 Ftlo Webre-Wells 500 WATGYP_WATGP 457 Waterford-Little Gypsy 230 #1 Ftlo Waterford-Little Gypsy 230 #2 CLYWIG_WGWAT 454 Coly-Vignes 230 Ftlo Willow Glen-Waterford 500 LEPA_TIECAPI 439 Import Limit For Lepa Interface AMRN_TIECAPI 425 Import Limit For Amrn Interface SCBSEM_BOCEC 409 Scott-Semere 138 Ftlo Bonin-Cecelia 138 LASTHM_WEBCJ 406 Thomas-La. Station 138 Ftlo Cajun-Webre 500 WHBSHE_MABEL 376 White Bluff-Sheridan Ftlo Mabelvale-Sheridan 500 MABSH_WBSH 338 Mablevale-Sheridan 500 Ftlo White Bluff-Sheridan LAKXF_RABLO 265 Lakeover115/500 Ftlo Lakeover-Ray Braswell 500 ELDAT1_MCNAT 260 El Dorado 500/115 Ftlo McNeil 500/115 HAYBLY_NMDEL 247 Hayti-Blytheville Interstate 161 Ftlo New Madrid-Dell 500 Table 4 - Limiting AFC Flowgates 3. Reliability Issues The base case used for ISTEP studies identified 235 lines that were overloaded under contingency conditions, and 414 buses that had low voltage under contingency conditions. The numbers above are not an indication Entergy Transmission System compliance with NERC Transmission Planning Standards, which allow for the use of operating December 5,

10 guides, redispatch, breaker operation, or other mitigation plans. These mitigation plans have not been taken into account in this analysis. 4. Must-Run Generation There are a number of load pockets on the Entergy Transmission System where the load cannot be served using a normal merit-order dispatch, due to transmission limitations. Under certain system conditions, generators within these load pockets must be run out of merit order to serve the load. These generators are designated as Reliability Must-Run (RMR) generation. The requirement for these units to generate out of merit-order can result in a higher cost for energy in the Entergy system. Projects are included in the ISTEP to reduce or remove must-run requirements; however, these projects are not specifically identified because information on RMR units has not been made publicly available. December 5,

11 IV. Study Assumptions A. Modeling Assumptions The 2015 Summer model was used as the starting point for ISTEP studies. Several additional dispatch scenarios were run in order to simulate system conditions that would cause a flowgate to show up as overloaded under contingency, that do not show up given the dispatch in the base case model. Upgrades from Entergy s Construction Plan were included in the model. There were no Base Plan upgrades included in the models. Those upgrades are listed below. Construction Plan (Approved) o Port Hudson 69 kv Bus Upgrade o Beaumont 69 kv Upgrades o Bluewater 69 kv capacitor bank o WESCO 230 kv Reconfiguration o Upgrade 138 kv Alchem Monochem o Hilltop 161 kv station o Winn 69 kv capacitor bank o Hanks Kolbs 230 kv Upgrade o Grimes Bus Reconfiguration o Sterlington Perryville CKT 2 o Ray Braswell 500/230 kv transformer #2 o Upgrade Monroe Walnut Grove 115 kv o Convert Amite Hammond 115 kv to 230 kv o McManus 69 kv capacitor bank o McComb 115 kv capacitor bank o Upgrade Liberty Gloster 115 kv o Senatobia capacitor bank o Expand 69 kv Calvert capacitor bank o North Bastrop 115 kv reconfiguration o Alliance - Happy Jack 115 kv o Amite South Phase II o Amite South Phase III o DSG Phase III o Coly Hammond 230 kv o Grambling Winnfield 230 kv o Madison Ridgeland 230 kv Construction Plan (Proposed) o Napoleonville 115 kv capacitor bank o Lawtag Jennings 69 kv upgrade o Cabot 500/115 kv station December 5,

12 o Sarepta 345/115 kv station o Upgrade Lafayette Holiday 69 kv o Upgrade Chlomal Lacassine 69 kv o Peters Rd. Oakville 230 kv o Oakville Alliance 230 kv o Horn Lake o Restore Patterson December 5,

13 V. Proposed Upgrade Discussion A. Overview of Proposed Upgrades The ISTEP upgrades include over 1400 miles of 500 kv lines, over 1000 miles of 230 kv lines, and over 50 transformers. The upgrades are presented in detail below, in groups by geographic region or project. Figure 1, below shows all of the upgrades included in the ISTEP. 500 kv line 345 kv line 230 kv line Transformer Figure 1 - ISTEP Upgrade Overview December 5,

14 B. Amite South Upgrades Figure 2 - Amite South Upgrades 1. Description The proposed Amite South upgrades include the creation of a 500 kv circuit around the New Orleans area. The proposed projects are listed below in Table 5. December 5,

15 Project Description Voltage Mileage Tap Daniel McKnight, loop into Bogalusa Convert Waterford 9 Mile 230 kv to 500 kv /230 kv transformer at 9 Mile 500/230 9 Mile Michoud 500 kv /230 kv transformer at Michoud 500/230 Michoud Bogalusa 500 kv nd 500/230 kv transformer at Bogalusa 500/230 Adams Creek Bogalusa CKT Table 5 - Amite South ISTEP Upgrades The upgrades include tapping the Daniel to McKnight 500 kv line near the Bogalusa substation, and building 22 miles of 500 kv line to tie Daniel to McKnight into Bogalusa. In order to facilitate the new connections at Bogalusa, an additional 500/230 kv transformer is needed, as well as another 230 kv line between Adams Creek and Bogalusa. The project also includes the conversion of the existing Waterford to 9 Mile line to 500 kv operation, terminating with a 500/230 kv transformer at 9 Mile. A new 500 kv line from 9 Mile to Michoud, along with a 500/230 kv transformer at Michoud is also included. To complete the circuit, a new 500 kv line from Bogalusa to Michoud would be built. 2. Project Selection The projects were selected to improve import capability into the Amite South and DSG load pockets, and to reduce generation requirements in the load pocket. A portion of Waterford 9 Mile is built to 500 kv, but the line is operated at 230 kv. 3. Alternatives Considered None 4. Benefits The Amite South projects result in an increase in import capability of approximately 1000 MW. This increase in import capability into the Amite South region could reduce the requirements to have generation online in the load pocket. December 5,

16 Without Amite South Upgrades With Amite South Upgrades Available Transfer Capability (Entergy - Amite South) Table 6 - Transfer Capability Results: Amite South Upgrades In addition to the enhancement in transfer capability, the upgrades provide relief on some of the flowgates listed below: Flowgate Type Flowgate Name AFC WATGYP_WATGP AFC CLYWIG_WGWAT TLR Coly-Vignes for loss of Willow Glen-Waterford Table 7 - Flowgates Relieved by Amite South Upgrades December 5,

17 C. Acadiana Upgrades Table 8 - Acadiana Upgrades 1. Description The Acadiana upgrade plan involves creating strong 230 kv connections to the south of the Acadiana Load Pocket. The proposed upgrades are listed below in Table 9. December 5,

18 Project Description Voltage Mileage Wells - Scott 230 kv Scott - Bonin 230 kv Scott - Sellers Rd. 230 kv Sellers Rd. - Meaux 230 kv Meaux 230/138 kv transformer 230/138 Sellers Rd. - Richard 230 kv Richard 500/230 kv transformer 500/230 Sellers Rd. - Moril 230 kv Moril 230/138 kv transformer 230/138 Reconfigure 138 kv lines near Bonin 138 Table 9 - Acadiana ISTEP Upgrades The proposed upgrades include construction of a new 230 kv line from Wells Scott, along with a new 230 kv switching station at Scott. The lines from Scott Bonin and Bonin Cecelia would be joined at a new 138 kv switching station near the Labbe station, with a single 138 kv line from Bonin to the new switching station. A new 230 kv line from Scott Bonin would be constructed. A second 230 kv station would be constructed between Scott and Meaux, named Sellers Rd. From Sellers Rd, lines would be built to Meaux, Moril, Richard and Scott. 2. Project Selection The Acadiana projects have been selected, based upon the results of discussions amongst Cleco, Entergy, Lafayette and the ICT. The projects were selected in order to provide increased reliability, such that the Acadiana Load Pocket would be secure for the loss of a generator and a transmission line. The projects are also intended to address the flowgates that have had TLRs called recently. 3. Alternatives Considered ICT Acadiana Plan Webre 500/230 kv transformer Webre Cecelia 230 kv line Wells Cecelia 230 kv line Cecelia Moril 230 kv line Upgrade Bonin Cecelia 138 kv line Upgrade Cecelia Moril 138 kv line Upgrade Moril Dubion 138 kv line Moril Leblanc 138 kv line December 5,

19 Cleco Richard and Wells Plan Build a new 230 kv Richard Substation (500/230 kv Auto) Build a new 230 kv Meaux Substation (230/138 kv Auto) Build a new 230 kv Moril Station (230/138 kv Auto) Build a new 230 kv Station Where the Habetz to Flanders and Judice to Meaux lines Cross (Sellers Rd) Build a new Richard to Andrew 230 kv line Build a new Sellers Rd to Meaux 230 kv line Build a new Sellers Rd to Moril 230 kv line Build a new Wells to Bonin 230 kv line Build a new Sellers Rd to Bonin 230 kv line Disconnect Scott - Bonin and Bonin - Cecelia from Bonin (Bonin Bypass) Add a second 230 Auto at Bonin (230/69 or 230/138) Add Capacitor Banks Cleco Richard and Webre Plan Build a new 230 kv Richard Substation (500/230 kv Auto) Build a new 230 kv Meaux Substation (230/138 kv Auto) Build a new 230 kv Moril Station (230/138 kv Auto) Build a new 230 kv Webre Station (500/230 kv Auto) Build a new 230 kv Station Where the Habetz to Flanders and Judice to Meaux lines Cross (Andrew) Build a new Richard to Andrew 230 kv line Build a new Andrew to Meaux 230 kv line Build a new Andrew to Moril 230 kv line Build a new Moril to Webre 230 kv line Build a new Andrew to Bonin 230 kv line Disconnect Scott - Bonin and Bonin - Cecelia from Bonin (Bonin Bypass) Add a second 230 Auto at Bonin (230/69 or 230/138) Add Capacitor Banks Wells Meaux Project Wells Scott 230 kv Scott Bonin 230 kv Scott Meaux 230 kv Reconfigure 138 kv lines near Bonin 4. Benefits The Acadiana ISTEP upgrade would result in improved load-serving capability for the Acadiana Load Pocket, ensuring that the load pocket could sustain the loss of a generating unit and a transmission line. December 5,

20 Transfer capability into the load pocket is also increased by over 700 MW. Available Transfer Capability (Entergy -> Acadiana Load Pocket) Without Acadiana Upgrades Table 10 - Transfer Capability Results: Acadiana Upgrades With Acadiana Upgrades In addition, this project addresses several flowgates that are constraining to transmission service, and have had TLRs issued on. The flowgates that are relieved by these upgrades are listed below. Flowgate Type Flowgate Name TLR Meaux-Judice 138KV FTLO Flanders-Hopkins 138KV TLR Cecelia-Moril 138 kv for loss of Flanders-Hopkins 138 kv TLR Scott-Bonin 138 kv for loss of TJ Labbe-Bonin 230 kv TLC Richard - Colonial Academy 138 AFC SCBSEM_WLPNT AFC SCBSEM_PNTBO AFC NRCSCB_WLPNT AFC RAYBAX_GGFRA AFC MCADXF_LAKOV AFC BONCEC_RICCO AFC BONXF_FLNHPK AFC SCBBON_WLPNT AFC BONXF_RICSCB AFC SCBSEM_WELXF AFC NCRSCB_RICHR AFC SCBSEM_BOCEC Table 11 - Flowgates Relieved by Acadiana Upgrades December 5,

21 D. Monroe Area 230 kv Figure 3 - Monroe Area 230 kv Upgrades 1. Description These upgrades constitute a 230 kv loop around the Monroe/West Monroe area. The upgrades are described below in Table 12. December 5,

22 Project Description Voltage Mileage Sterlington 500/230 kv transformer 500/230 Convert Sterlington - Drew to 230 kv Convert Drew - Cheniere to 230 kv Convert Cheniere - Riser to 230 kv Convert Riser - Frostkraft to 230 kv Frostkraft 230/115 kv transformer 230/115 Convert Frostkraft - Rilla to 230 kv Tap Frostkraft - Rilla at Buckhorn Buckhorn 230/69 kv transformer 230/69 Rilla 230/115 kv transformer 230/115 Convert Rilla Selman Field to 230 kv Convert Selman Field - Sterlington to 230 kv Selman Field 230/69 kv transformer 230/69 Grambling - Rilla 230 kv Table 12 - Monroe Area 230 kv ISTEP Upgrades Complete a 230 kv loop around Monroe/West Monroe by converting existing 115 kv lines to 230 kv operation. Tap Frostkraft Rilla where the line passes by the Buckhorn 69 kv station, and install a step-down transformer there. 2. Project Selection Projects are driven by potential low voltage in the Monroe area with limited generation resources online. Several of the lines included in the upgrade package are built to 230 kv, but operated at 115 kv. The Grambling Rilla line was selected in order to have a secondary source to the 230 kv network constructed. 3. Alternatives Considered None 4. Benefits These projects provide an improvement to load-serving capability in the local area in the form of additional voltage support, in addition to reducing loading on the Sterlington 500/115 kv transformers. December 5,

23 E. Southeast Arkansas 230 kv Figure 4 - Southeast Arkansas 230 kv Upgrades 1. Description This project consists of the conversion of a 115 kv circuit in Southeast Arkansas to 230 kv operations. The upgrades are listed below in Table 13. Project Description Voltage Mileage Convert Woodward - Pinebergen - Glendale Monticello E. to 230 kv Monticello E. 230/115 kv transformer 230/115 Convert Monticello E. - Lacey - Crossett Crossroad - Crosset N. to 230 kv Convert Crosset N. - Hamburg - Mist - Montrose - Montrose E. - Bagby to 230 kv Table 13 - Southeast Arkansas 230 kv ISTEP Upgrades December 5,

24 The project involves the conversion of a 115 kv circuit from Woodward, through Monticello to Bagby to 230 kv operation. 2. Project Selection Projects were selected to provide improved load-serving capability. These lines were selected due to the lines being constructed for 230 kv, but operated at 115 kv. 3. Alternatives Considered Build a parallel 230 kv circuit from Woodward to Monticello to Bagby 4. Benefits The upgrades provide some relief to loading, as well as an increase in voltage in the local area, contributing to improved load-serving capability in the area. December 5,

25 F. Ozarks EHV Figure 5 - Ozarks EHV Upgrades 1. Description This set of projects would create a new 500 kv network, supporting the Ozarks region of Northwest Arkansas and Southwest Missouri. The upgrades are listed below in Table 14. December 5,

26 Project Description Voltage Mileage McNeil Couch 500 kv Couch 500/115 kv transformer 500/115 Couch - NW Texarkana 500 kv NW Texarkana - Ft. Smith 500 kv Ft. Smith Flint Creek 500 kv Flint Creek 500/ /161 Flint Creek - Table Rock 500 kv Table Rock 500/ /161 Table Rock - ISES 500 kv Brookline - Table Rock 500 kv Brookline 500/ /345 Lacygne - Brookline 500 kv Lacygne 500/ /345 Table 14 - Ozarks EHV ISTEP Upgrades Create a 500 kv circuit that connects from McNeil through NW Texarkana, to Ft. Smith, to Flint Creek, to Table Rock, and onto ISES. The project also includes several lines in the SPP region, bringing a 500 kv line down from LaCygne to Brookline to Table Rock. 2. Project Selection These projects were originally proposed in the SPP EHV Overlay study. They are included here due to the benefits in transfer capability between the Entergy and SPP systems. 3. Alternatives Considered SPP Ozark Study Option A o ANO - S Fayetteville 500kV o E Centerton - Osage Creek - S Fayetteville - Chamber Springs 345kV o Flint Creek - Chouteau 345kV o GRDA1 - Flint Creek 345kV rating increase o Tontitown - Elm Springs 161kV rating increase o Tontitown - Dyess 161kV rating increase o Clarksville - Chamber Springs 345kV increase CT o Chamber Springs - Tontitown 161kV Reconductor o Flint Creek - Chamber Springs 345kV o Flint Creek - E Centerton 161kV Reconductor o S Fayetteville to E Fayetteville 161kV o Chamber Springs - Farmington 161kV Reconductor o Neosho SPA - Neosho EDME 161kV Reconductor o Monett 345/161kV Transformer o Monett - Chesapeak 161kV o Compton 161kV Tie o Compton Tie - Table Rock 161kV Reconductor December 5,

27 o Omaha 161kV Tie o Huben 345/161kV Transformer o Willow Springs - Mansfield 161kV o Norfork - Midway 161kV Reconductor o Hilltop Mountain View 161kV o Batesville N - ISES 161kV Reconductor o Searcy Price 500/161kV Transformer o Searcy Price 161/115kV Transformer o Datto 161kV Tie o Corning - TX Eastern 8 115kV Reconductor o Gobbler Knob 161kV Tie o Green Forest - Gobbler Knob 161kV Reconductor o Asherville - Idalia 161kV Reconductor o Jonesboro 500/161kV Transformer o Jonesboro - Jonesboro SPA 161kV Rebuild o Jonesboro - Hergett 161kV Reconductor o Harrisburg Tap - Truman 161kV Reconductor o Batesville 161kV Tie o Brookline - Summit - Table Rock - Osage Creek 500kV o Table Rock - Bull Shoals - Norfork - Independence 500kV SPP Ozark Study Option B o ANO - S Fayetteville 500kV o E Centerton - Osage Creek - S Fayetteville - Chamber Springs 345kV o Flint Creek - Chouteau 345kV o GRDA1 - Flint Creek 345kV rating increase o Tontitown - Elm Springs 161kV rating increase o Tontitown - Dyess 161kV rating increase o Clarksville - Chamber Springs 345kV increase CT o Chamber Springs - Tontitown 161kV Reconductor o Flint Creek - Chamber Springs 345kV o Flint Creek - E Centerton 161kV Reconductor o S Fayetteville to E Fayetteville 161kV o Chamber Springs - Farmington 161kV Reconductor o Neosho SPA - Neosho EDME 161kV Reconductor o Monett 345/161kV Transformer o Monett - Chesapeak 161kV o Compton 161kV Tie o Compton Tie - Table Rock 161kV Reconductor o Omaha 161kV Tie o Huben 345/161kV Transformer o Willow Springs - Mansfield 161kV o Norfork - Midway 161kV Reconductor o Hilltop Mountain View 161kV o Batesville N - ISES 161kV Reconductor o Searcy Price 500/161kV Transformer o Searcy Price 161/115kV Transformer December 5,

28 o Datto 161kV Tie o Corning - TX Eastern 8 115kV Reconductor o Gobbler Knob 161kV Tie o Green Forest - Gobbler Knob 161kV Reconductor o Asherville - Idalia 161kV Reconductor o Jonesboro 500/161kV Transformer o Jonesboro - Jonesboro SPA 161kV Rebuild o Jonesboro - Hergett 161kV Reconductor o Harrisburg Tap - Truman 161kV Reconductor o Batesville 161kV Tie o Brookline - Summit - Table Rock - Osage Creek 345kV o Table Rock - Bull Shoals - Norfork - Thayer - Gobbler Knob 345kV o E Centerton - Tontitown 161kV o Asherville - Poplar Bluff 161kV Reconductor o Heber Springs N - Pangburn 161kV 4. Benefits The Ozarks EHV project provides an improvement in transfer capability between the Entergy and SPP systems. It also provides additional support to a rapidly growing Northwest Arkansas region. Without Ozarks Upgrades With Ozarks Upgrades Transfer From Transfer To Available Transfer Capability Available Transfer Capability Entergy AECI Entergy AEPW Entergy EMDE Entergy OKGE 0 97 Entergy SWPA 0 44 Entergy TVA AECI Entergy AEPW Entergy 0 0 EMDE Entergy LAFA Entergy OKGE Entergy SMEPA Entergy SWPA Entergy Table 15 - Transfer Capability Results: Ozarks Upgrades December 5,

29 G. South LA Bulk Figure 6 - South LA Bulk Upgrades 1. Description Table 16, below, lists the upgrades included in the South LA Bulk project. Project Description Voltage Mileage Fancy Point Hartburg 500 kv Table 16 - South LA Bulk ISTEP Upgrades This upgrade consists of building a new 500 kv line from Fancy Point Hartburg 500 kv. 2. Project Selection This project was selected in order to address several constraining flowgates, notably Webre Wells and Mt. Olive - Hartburg. 3. Alternatives Considered Fancy Point Richard McKnight Hartburg ICT Acadiana Project Cleco Richard and Webre Plan December 5,

30 4. Benefits The South LA Bulk project provides additional import capability into the WOTAB region of the Entergy Transmission System. The project should provide relief on several flowgates that are limiting to transfer capability and have TLRs called on them; those flowgates are listed below. Flowgate Type Flowgate Name AFC LASTHM_WEBWL AFC DODDAN_HARMT AFC TBOGRN_WEBWL AFC LASTHM_WEBCJ TLR Wilbert-Livonia for loss of Webre-Wells TLR Mt. Olive - Hartburg for the loss of Webre - Wells TLR Thomas-Louisiana Station 138 kv ftlo Webre-Wells 500 TLR Terrebonne-Greenwood for loss of Webre-Wells TLR Willow Glenn-Addis 138KV FTLO Webre-Wells 500KV Table 17 - Flowgates Relieved by South LA Bulk Upgrades December 5,

31 H. Western Region Figure 7 - Western Region Upgrades 1. Description The Western Region project consists of a 500 kv loop into Western Region, in addition to the strengthening of ties from the West. The upgrades included in this project are presented below in Table 18. Project Description Voltage Mileage Cypress Lewis Creek 500 kv /138 kv transformer at Lewis Creek 500/138 Hartburg Sabine 500 kv /230 kv transformer at Sabine 500/230 Sabine Porter 500 kv /230 kv transformer at Porter 500/230 Porter Lewis Creek 500 kv Lewis Creek Grimes 500 kv Grimes 500/138 transformer 500/138 Porter - Goslin 230 kv Goslin 230/138 kv transformer 230/138 Tap Crockett - Grimes near Rivtrin (Quarry) 345 Quarry - Rivtrin 345 kv /138 kv transformer at Rivtrin 345/138 Table 18 - Western Region ISTEP Upgrades December 5,

32 The upgrades include extending 500 kv from Cypress to Lewis Creek, through Porter, to Sabine, and returning to Hartburg. In addition to these lines, a 500 kv line from Grimes to Lewis Creek is included. Additionally, bringing a 345 kv line into Rivtrin, by tapping the Crockett Grimes 345 kv line is included. 2. Project Selection The projects are based on Entergy Western Region expansion plans, and then modifying and increasing the capacity of those upgrades. The projects are focused on providing additional import capability into Western Region. 3. Alternatives Considered Entergy Western Region Phase III, IIIA, IV Western Region Phase III o Convert Jacinto Lewis Creek to 230 kv o Build a 230 kv line from Cypress Jacinto o Add a 230/138 kv Auto at Lewis Creek Western Region Phase IIIA o Tap Grimes Crockett 345 kv near Rivtrin (Quarry) o Quarry Rivtrin 345 kv o Add a 345/138 kv transformer at Rivtrin Western Region Phase IV o Build a 230 kv line from Lewis Creek - Porter 4. Benefits This project results in increased transfer capability into Western Region. In addition to the increase in transfer capability, line loadings are reduced, and voltage is improved in the area. Available Transfer Capability (Entergy -> Western Region) Without Western Region Upgrades With Western Region Upgrades Table 19 - Transfer Capability Results: Western Region Upgrades December 5,

33 I. Northwest LA Bulk Figure 8 - Northwest LA Bulk Upgrades 1. Description This project involves the construction of one new 500 kv line, one 345 kv line, and installing a new step-down station. Details are below in Table 20. Project Description Voltage Mileage Sarepta - Dolet Hills 345 kv Sterlington - Mt. Olive 500 kv Messick Tap 500 Messick 500/230 kv transformer 500/230 Table 20 - Northwest LA Bulk ISTEP Upgrades Entergy s Construction Plan includes tapping El Dorado Longwood 345 kv at Sarepta, and installing a 345/115 kv transformer. This project builds from that, and includes a 345 kv line south to Dolet Hills from Sarepta. Also included is a 500 kv line from Sterlington Mt. Olive. The last portion of the project is to tap Mt. Olive Hartburg near Messick, and install a 500/230 kv transformer. December 5,

34 2. Project Selection The Messick project was selected in order to improve transfer capability between Entergy and Cleco, and also to help relieve the stability limitations on Mt. Olive Hartburg, by splitting the line into smaller sections. The Sarepta Dolet hills line was selected in order to improve transfer capability between Entergy and Cleco, and to enhance an existing Construction Plan project. Installing a Mt. Olive Sterlington 500 kv line was chosen in order to improve transfer capability into the WOTAB Region. 3. Alternatives Considered McNeil Sarepta 500 kv Sarepta Messick 345 kv 4. Benefits This project should relax the stability limitations on the Mt. Olive Hartburg line by effectively shortening the line. Interface capacity between Entergy, Cleco and AEP is also improved. The projects also address several flowgates related to transfer capability and TLRs. Those flowgates are listed below. Flowgate Type AFC AFC TLR Flowgate Name DODDAN_HARMT MTOHTB_WEBWL Mt. Olive - Hartburg for the loss of Webre - Wells Table 21 - Flowgates Relieved by North LA Upgrades December 5,

35 J. South MS 230 kv Figure 9 - South MS 230 kv Upgrades 1. Description The South MS 230 kv project involves the construction of a 230 kv line parallel to the existing 115 kv line between Jackson and Amite. The upgrades are listed below in Table 22. December 5,

36 Project Description Voltage Mileage Ray Braswell - Terry 230 kv Terry 230/115 kv transformer 230/115 Terry - Brookhaven 230 kv Brookhaven - Franklin 230 kv Brookhaven 230/115 kv transformer 230/115 McComb - Amite 230 kv Natchez Ind. Franklin 230 kv Natchez Ind. 230/115 kv transformer 230/115 Franklin 500/230 kv transformer 500/230 Franklin - McComb 230 kv McComb 230/115 kv transformer 230/115 Table 22 - South MS 230 ISTEP Upgrades The project includes a new 230 kv line from Ray Braswell to Terry, continuing to Brookhaven. A new 230 kv line from Franklin into McComb substation is included, as well as a line between Franklin and Natchez Industrial. 2. Project Selection Projects were selected in order to improve load-serving capability in the local area. 3. Alternatives Considered Jackson South Terry 230 kv 4. Benefits This project provides improved load-serving capability to the region, by improving voltage, and reducing overloads in the area. The project also addresses several flowgates associated with transmission service and TLRs. Those flowgates are listed below. Flowgate Type TLR TLR Flowgate Name Brookhaven-Wesson FTLO Grand Gulf-Baxter Wilson 500KV Byram-Terry 115KV FTLO Grand Gulf-Franklin 500KV Table 23 - Flowgates Relieved by South MS Projects December 5,

37 K. SOCO/SMEPA Interface Improvement Figure 10 - SOCO/SMEPA Interface Improvement Upgrades 1. Description This project consists of two new 230 kv lines to tie with the Southern/SMEPA systems. Project Description Voltage Mileage Rankin - Magee 230 kv Magee 230/115 kv transformer 230/115 Magee - Hattiesburg 230 kv Brookhaven - Magee 230 kv Table 24 - SOCO/SMEPA Interface Improvement ISTEP Upgrades 2. Project Selection Southern Company s Regional Planning Stakeholders Group (RPSG) recommended the construction of a Rankin Sweatt 230 kv and Rankin Hattiesburg 230 kv in order to improve transfer capability between Southern and Entergy. These projects were selected as a modification of the Southern proposal. December 5,

38 3. Alternatives Considered Rankin Sweatt 230 kv Rankin Hattiesburg 230 kv 4. Benefits These upgrades tie in with the South MS 230 kv ISTEP upgrades, and improve the transfer capability between Southern, SMEPA and Entergy. Without SOCO/SMEPA Upgrades With SOCO/SMEPA Upgrades Available Transfer Capability (Entergy - SOCO) Available Transfer Capability (Entergy - SMEPA) Table 25 - Transfer Capability Results: SOCO/SMEPA Upgrades December 5,

39 L. North LA 230 kv Figure 11 - North LA 230 kv Upgrades 1. Description This project consists of the conversion of several 115 kv lines in North Louisiana, and one new 230 kv line. Details are below Table 26. December 5,

40 Project Description Voltage Mileage Convert Natchez Industrial - Plantation - S. Ferriday - Red Gum 115kV to 230kV Plantation 230/115kV transformer 230/115 S. Ferriday 230/115kV transformer 230/115 Red Gum 230/115kV transformer 230/115 Convert Winnfield - Standard to 230kV /115kV transformer at Standard 230/115 Convert Standard - Red Gum to 230 kv Tap Baxter Wilson - Perryville at Tallulah Tallulah 500/115 kv transformer 500/115 Red Gum - Tallulah 230kV Tallulah 500/230 kv transformer 500/230 Table 26 - North LA 230 ISTEP Upgrades This project involves the conversion of existing 115 kv lines from Winnfield, through Red Gum, to Natchez to 230 kv. Also included is a tapping Baxter Wilson Perryville 500 kv line at Tallulah, and building a new 230 kv line from Tallulah to Red Gum. 2. Project Selection These projects are driven by improving load-serving capability in the local area. Some of the lines included in this project are built to 230 kv, but operated at 115 kv. 3. Alternatives Considered Red Gum Natchez SES 230 Grand Gulf Natchez SES 500 kv 4. Benefits This project provides an enhancement to improving load-serving capability in the local area. December 5,

41 M. Northshore 230 kv Figure 12 - Northshore 230 kv Upgrades 1. Description This project consists of the conversion of existing 115 kv lines to 230 kv. Project details are below in Table 27. Project Description Voltage Mileage Convert Amite - Chicken Farm - Franklinton - Bogalusa to 230kV Franklinton 230/115 kv transformer 230/115 Table 27 - Northshore 230 kv ISTEP Upgrades 2. Project Selection Projects were selected to improve load-serving capability in the local area. 3. Alternatives Considered None 4. Benefits This project provides an improvement to load-serving capability in the local area. December 5,

42 N. North MS Bulk Figure 13 - North MS Bulk Upgrades December 5,

43 1. Description This project consists of a new 500 kv line from Freeport to McAdams. Details of the upgrades included are presented in Table 28. Project Description Voltage Mileage Freeport - Batesville 500kV Batesville 500/115 kv transformer 500/115 Tillatoba - Batesville 500 kv Tillatoba 500/230kV transformer 500/230 Tillatoba - McAdams 500 kv Indianola - Moon Lake 230kV Tap Indianola - Tillatoba 230, bring into Greenwood Greenwood 230/115 kv transformer 230/115 Table 28 - North MS Bulk ISTEP Upgrades 2. Project Selection The projects were selected primarily to relieve issues with flowgates on the Entergy TVA interface, particularly the McAdams 500/230 kv transformer. The addition of the 230 kv line to Greenwood is designed to provide improved load-serving capability in the local area. 3. Alternatives Considered Batesville Ritchie 500 kv 4. Benefits This project results in an improvement in transfer capability between the Entergy and TVA systems. Also, with these upgrades in place, a reduction in post-contingent loading is seen on the 500/230 kv transformer at McAdams. Without North MS Upgrades With North MS Upgrades Available Transfer Capability (Entergy -> TVA) Table 29 - Transfer Capability Results: North MS Bulk December 5,

44 O. Central Arkansas 230 kv Figure 14 - Central Arkansas 230: Conway Upgrades Figure 15 - Central Arkansas 230: Little Rock Upgrades December 5,

45 Figure 16 - Central Arkansas 230: Hot Springs Upgrades 1. Description This project involves the creation of new 230 kv networks in the cities of Conway, Little Rock, and Hot Springs in Arkansas. Details for the upgrades for Conway are below in Table 30, for Little Rock in Table 31, and Hot Springs in Table 32. Project Description Voltage Mileage Cabot 500/230 kv transformer 500/230 Cabot - Gold Creek 230 kv Gold Creek 230/115 kv transformer 230/115 Gold Creek - Conway Ind. 230 kv Conway Ind. 230/115 kv transformer 230/115 Conway Ind. - Conway W. 230 kv Conway W. 230/115 kv 230/115 Tap Mayflower - Pleasant Hill Near Gleason Gleason 500/230 kv 500/230 Gleason - Conway W. 230 kv Table 30 - Central Arkansas 230 kv: Conway ISTEP Upgrades December 5,

46 Project Description Voltage Mileage Wrightsville 500/230 kv transformer 500/230 Mabelvale 500/230 kv transformer 500/230 Wrightsville - Little Rock South 230 kv Little Rock South 230/115 kv transformer 230/115 Convert Little Rock South - Rock Creek to 230 kv Convert LR Rock Creek - LR Boyle to 230 kv Convert LR Boyle - LR West to 230 kv Convert LR West - LR Markham to 230 kv Convert LR Markham - Kanis to 230 kv Kanis 230/115 kv transformer 230/115 Kanis - Mabelvale 230 kv Convert LR West - LR 8th & Woodrow to 230 kv Convert LR 8 th & Woodrow - LR Gaines to 230 kv LR Gaines 230/ /115 Table 31 - Central Arkansas 230 kv: Little Rock ISTEP Upgrades Project Description Voltage Mileage Cheetah 230/115 kv transformer 230/115 Mablevale - Cheetah 230 kv Cheetah - Mt. Pine South Mt. Pine South - Carpenter 230 kv Carpenter 230/115 kv transformer 230/115 Carpenter - Hot Springs EHV 230 kv Hot Springs EHV 500/230 kv transformer 500/230 Hot Springs - Cheetah 230 kv Mt. Pine South 230/115 kv transformer 230/115 Table 32 - Central Arkansas 230 kv: Hot Springs ISTEP Upgrades 2. Project Selection These projects were selected in order to provide improved load-serving capability to these load centers in Central Arkansas. Additionally, the upgrades near Conway were selected in order to reduce TLR events on Morrilton East Gleason and Pleasant Hill Greenbrier. 3. Alternatives Considered Tapping Mablevale Mayflower at Pinnacle, install 500/115 kv transformer Mabelvale LR South 500 kv Cabot Mayflower 500 kv December 5,

47 4. Benefits The upgrades result in reductions in loading and increased voltage in the Little Rock, Conway, and Hot Springs. The upgrades should also result in a reduction in TLRs on Morrliton East Gleason. Flowgate Type TLR TLR Flowgate Name Morrilton East-Gleason 161 kv ftlo Pleasant Hills-Mayflower 500 kv Conway- Donaghey 161KV FTLO Pleasant Hills-Greenbrier 161KV Table 33 - Flowgates Relieved by Central Arkansas 230 Upgrades December 5,

48 P. Brinkley East Figure 17 - Brinkley East Upgrades 1. Description The Brinkley East project involves tapping West Memphis Keo near Brinkley East, and installing a 500/230 kv transformer. Details are below in Table 34. Project Description Voltage Mileage Tap Keo - West Memphis at Brinkley East /230 kv transformer at Brinkley East 500/230 Table 34 - Brinkley East ISTEP Upgrades 2. Project Selection The project was selected to provide an improvement to load-serving capability in the local area. 3. Alternatives Considered Tap Keo West Memphis 500 kv at Moses 4. Benefits This project provides an improvement to load-serving capability in the local area. December 5,

49 Q. Central Arkansas Bulk Figure 18 - Central Arkansas Bulk Upgrades 1. Description This project involves the construction of a new 500 kv line between Wrightsville White Bluff. Details are below in Table 35. Project Description Voltage Mileage Wrightsville - White Bluff 500 kv Table 35 - Central Arkansas Bulk ISTEP Upgrades 2. Project Selection This project was selected in order to address TLR issues on the White Bluff Keo and Sheridan Mabelvale flowgates. 3. Alternatives Considered White Bluff Mabelvale 500 kv 4. Benefits This project will reduce TLR events, and increase AFC on several flowgates, as well as increasing transfer capability to other systems. The increase in transfer capability is shown below. December 5,

50 Without Central AR Upgrades With Central AR Upgrades Available Transfer Capability (Entergy - TVA) Available Transfer Capability (Entergy - AMRN) Table 36 - Transfer Capability Results: Central Arkansas Upgrades The flowgates that are relieved by this project are below. Flowgate Type Flowgate Name AFC WHBSHE_MABEL AFC MABSH_WBSH TLR White Bluff-KEO 500KV FTLO Sheridan-Mabelvale 500KV TLR White Bluff-Keo 500KV FTLO Wrightsville-Keo 500KV TLR White Bluff-Sheridan for loss of Mabelvale-Sheridan TLR Mabelvale-Sheridan for loss of White Bluff-Sheridan Table 37 - Flowgates Relieved by Central Arkansas Bulk Upgrades December 5,

51 R. Jackson Area Figure 19 - Jackson Area Upgrades 1. Description These projects involve building a new 230 kv switching station and 230 kv line North of Jackson, MS. Project Description Voltage Mileage Tap Lakeover - McAdams, where it crosses Pickens Canton 500 Tap station 500/230 kv transformer 500/230 Bozeman - Lakeover 230 kv Table 38 - Jackson Area ISTEP Upgrades December 5,

52 2. Project Selection These projects were selected in order to improve load-serving capability in the local area, and to reduce TLR events on McAdams Lakeover. 3. Alternatives Considered McAdams Pickens 500 kv 500/230 kv transformer at Attala 4. Benefits These projects provide an improvement to load-serving capability in the local area. TLR events would be reduced on the McAdams 500/230 kv transformer. December 5,

53 S. Central MS Bulk Figure 20 - Central MS Bulk Upgrades 1. Description The Central MS Bulk project is the construction of a new 500 kv line from Ray Braswell Grand Gulf. Details are below in Table 39. Project Description Voltage Mileage Ray Braswell - Grand Gulf 500 kv Table 39 - Central MS Bulk ISTEP Upgrades 2. Project Selection Projects were selected in order to improve transfer capability on the Entergy Transmission System. 3. Alternatives Considered Grand Gulf Natchez SES 500 kv Natchez SES Fancy Point 500 kv December 5,

54 4. Benefits The benefits from this project include improved internal transfer capability. Flowgates relieved by this project are listed below. Flowgate Type TLR TLR Flowgate Name Ray Braswell 500/115 AT1 FTLO Ray Braswell-Lakeover 500KV RAYBAX_GGFRA Table 40 - Flowgates Relieved by Central MS Bulk Upgrades December 5,