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10 Year Transmission Expansion Plan

10 Year Transmission Expansion Plan. The projects described in this presentation represent the current ten (10) year expansion plan. The expansion plan is periodically reviewed and may be revised due to changes in assumptions.

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10 Year Transmission Expansion Plan

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  1. 10 Year Transmission Expansion Plan

  2. The projects described in this presentation represent the current ten (10) year expansion plan. The expansion plan is periodically reviewed and may be revised due to changes in assumptions. This presentation does not represent a commitment to build for projects listed in the future. Disclaimer

  3. Existing Generation Future Generation Regional Assumptions Walker Park Dahlberg Hancock CC Rocky Mtn Warren Co Bio McDonough Vogtle Wansley West Georgia Washington Co CT Central AL Tenaska Rumble Road #1 CC Harris CC Elmore Co CC Appling Co Bio Kemper Farley SOWEGA McIntosh Lansing Smith CT East Bainbridge

  4. Generation Assumptions utilized during the 2009 Transmission Expansion Planning Process

  5. Generation Assumptions utilized during the 2009 Transmission Expansion Planning Process

  6. Generation Assumptions utilized during the 2009 Transmission Expansion Planning Process

  7. Region’s Planning Responsibilities East West

  8. East • Georgia Integrated • Transmission System (ITS) • Dalton Utilities • GTC (Georgia Transmission Corporation) • MEAG (Municipal Electric Authority of GA) • Southern Company Transmission Jointly Planned ITS

  9. 2010 ITS-1 Expansion Item ITS-1 • Ola 230 / 115 kV Project • Construct a new 230 kV circuit from Klondike to Ola by way of two new GTC load stations, Jackson Creek and East Lake • Convert the existing East Lake – Ola 115 kV line to 230 kV operation. • Install a 400 MVA, 230 / 115 kV autobank at OLA and three 115 kV breakers to terminate the lines to McDonough, Porterdale and Island Shoals. • The loss of the McDonough – Stockbridge 115 kV T.L. causes multiple facilities to overload.

  10. 2010 ITS-2 Expansion Item ITS-2 • North Americus Series Reactors • Install two series reactors at North Americus, a 2% 230 kV series reactor on the North Americus – North Tifton 230 kV line and a 2% 230 kV series reactor on the North Americus – Talbot County #2 230 kV line. • The loss of Hatch unit #1 and North Tifton 500 / 230 kV transformer cause thermal overloads on the North Americus – North Tifton 230 kV line. Additionally, the loss of Hatch unit #2 and Fortson – North Tifton 500 kV line cause thermal overloads on the North Americus – Talbot County #2 230 kV line.

  11. 2010 ITS-3 Expansion Item ITS-3 • McDonough 4 & 5 Network Improvement • Construct the Jack McDonough – Smyrna 230 kV line via Cumberland (convert from 115 kV) and Galleria (new) substations. Add a 5 element, 230 kV ring bus at Smyrna and replace the 300 MVA 230 / 115 kV transformer with two 400 MVA transformers. • The loss of the Jack McDonough – Peachtree 230 kV T.L. will cause overloading of the facilities surrounding McDonough.

  12. 2010 ITS-4a Expansion Item ITS-4a • Pegamore 230 kV Project • Construct a new 230 kV switching station (Pegamore 230 kV SS) on the newly converted Bowen – Villa Rica 230 kV line at Huntsville Junction. • Install three 230 kV breakers to terminate the Bowen, Villa Rica, and McConnell Road 230 kV Lines. • Construct a new 230 kV line using existing ROW, from Pegamore to Huntsville, and from Huntsville to the McConnell Road 230 / 115 kV substation.

  13. 2010 ITS-4b Expansion Item ITS-4b • Pegamore 230 kV Project • Install a 230 kV breaker at McConnell substation and terminate the Pegamore line. Convert the Huntsville, Battlefield, and Cedarcrest substations to 230 kV operation. • This project will alleviate multiple thermal overloads and provide approximately 100 MVAR's of reactive support in the area.

  14. 2010 ITS-5a Expansion Item ITS-5a • Thomson 500 / 230 kV Project • Expand the 500 kV ring bus at Warthen and terminate the Thomson Primary 500 kV line. • Construct a 500 kV switchyard and expand the 230 kV switchyard at Thomson Primary. • Install a 1344 MVA, 500 / 230 kV transformer at Thomson Primary. • Replace the 140 MVA, 230 / 115 kV transformer at Thomson Primary with a 300 MVA transformer. • Construct 23 miles of 230 kV line on new ROW from Thomson Primary to Dum Jon.

  15. 2010 ITS-5b Expansion Item ITS-5b • Thomson 500 / 230 kV Project • Install a 230 kV breaker at Dum Jon to terminate the Thomson Primary line. • Replace the 125 MVA, 230 / 115 kV transformer at Evans Primary with a 300 MVA transformer. • Construct 35 miles of 500 kV line from Warthen to Thomson Primary. • The loss of the Goshen – Peach Orchard section of the Dum Jon – Goshen 230 kV T.L. will overload the Dum Jon – West Augusta 115 kV T.L. An outage of the Goshen 230 kV #1 bus will overload both the Goshen – Vogtle 230 kV T.L. (Black) and the Goshen 230 / 115 kV #2 transformer.

  16. 2010 ITS-6 Expansion Item ITS-6 • Union Point – Warrenton 115 kV Rebuild • Rebuild the Union Point – Warrenton 115 kV line (26.7 miles of 336 ACSR) with 1351 ACSR conductor at 230 kV specifications. • The loss of the East Social Circle – Madison Primary 115 kV T.L. will overload the Union Point – Warrenton 115 kV T.L.

  17. 2010 ITS-7 Expansion Item ITS-7 • Klondike 230 kV Reactor Project • Install a 0.5 %, 230 kV series reactor. • The loss of the Klondike – Norcross 500 kV T.L. causes the Klondike 500 / 230 kV transformer to overload.

  18. 2011 ITS-8a Expansion Item ITS-8a • Factory Shoals • Create a 230 / 115 kV network substation at Factory Shoals. • Install one 230 / 115 kV 300 MVA transformer. • Tap the Adamsville – Douglasville 230 kV line from Buzzard Roost for 230 kV source using existing line. • Create a 115 kV network station by breakering up the Douglasville – Greenbriar 115 kV line.

  19. 2011 ITS-8b Expansion Item ITS-8b • Factory Shoals • Install three 230 kV breakers at Buzzard Roost, looping in the Adamsville- Douglasville 230 kV line, with a third terminal serving Factory Shoals. Tap the Adamsville – Douglasville 230 kV line from Buzzard Roost for 230 kV source using existing line. • Alleviates the overload of Gordon Road – Hightower 115 kV T.L., Adamsville – Greenbriar 115 kV T.L. and the Douglasville 230 / 115 kV transformer given various contingencies.

  20. 2011 ITS-9 Expansion Item ITS-9 • Arkwright – Gordon #1 115 kV Transmission Line • Rebuild the Arkwright – Gordon #1 115 kV Transmission Line (23.6 miles) with 100° C 795 ACSR conductor. • This line becomes thermally overloaded given multiple contingencies in 2011.

  21. 2013 ITS-10 Expansion Item ITS-10 • East Social Circle 230 kV Series Reactors • Install a 2%, 230 kV series reactor at East Social on the Branch – East Social Circle 230 kV T.L. • The loss of the Franklin unit #2 and Branch – East Social Circle 230 kV T.L.

  22. 2014 ITS-11 Expansion Item ITS-11 • East Carrollton 230 / 115 kV Substation • Construct the East Carrollton 230 / 115 kV substation looping the Hickory Level – Yellowdirt 230 kV T.L. and the Possum Branch – Yates 115 kV T.L.. • Reconductor 1.5 miles of 115 kV T.L. from Clem – Oak Mtn. – Holox – East Carrollton – Southwire – Carrollton #2 Junction • With Yates unit #3 offline, the loss of Hickory Level – Sand Hill 115 kV T.L. causes Mt. Zion – Jonesville Junction 115 kV T.L. to overload. Additionally, the loss of either Bremen or Hickory Level 230 / 115 kV transformers will cause the other transformer to exceed its rating.

  23. 2014 ITS-12 Expansion Item ITS-12 • Goshen – Waynesboro 115 kV Transmission Line • Reconductor the Goshen – Waynesboro 115 kV T.L., 18.7 miles, with 1033 ACSR. • Loss of the Wilson – Waynesboro 230 kV T.L. will load the Goshen – Waynesboro 115 kV T.L. to 112% of its 124 MVA conductor rating.

  24. 2014 ITS-13 Expansion Item ITS-13 • Hatch – Offerman 230 kV Transmission Line • Reconductor 27.1 miles of 230 kV T.L. from Appling Biomass to Offerman. • The loss of the 500 / 230 kV transformer at Thalmann with Farley unit # 1 offline causes this section to become overloaded.

  25. 2014 ITS-14 Expansion Item ITS-14 • Bethabara 230 / 115 kV project • Delay project from 2011 to 2014. • Build a new 230 / 115kV substation (Bethabara). • Build a new 230 kV switching station (Clarksboro). • Build a new 115 kV switching station (Jefferson Rd). • Build a new 230kV T.L. from Bethabara to Clarksboro. • Build a new 115 kV T.L. from Bethabara to the Georgia Square substation. • Loop the Athens – Winder 115 kV T.L. into the 115 kV • Jefferson Road Switching Station. • Project alleviates multiple thermal overloads in the northeast Georgia area.

  26. 2015 ITS-15a Expansion Item ITS-15a • East Walton 500 / 230 kV Project – P1 • Construct a new 500 /230 kV Substation at East Walton. • Construct a new Rockville 500 kV Switching Station. • Construct a new 500 kV T.L. from the new Rockville 500 kV Switching Station to the new East Walton 500 / 230 kV substation. • Construct 230 kV T.L. from East Walton to Jacks Creek

  27. 2015 ITS-15b Expansion Item ITS-15b • East Walton 500 / 230 kV Project – P1 • Construct a new 230 kV T.L. from East Walton to the new Bostwick Switching Station. • Construct two new 230 kV T.L. from Bethabara to East Walton. • Reconductor Bostwick – East Watkinsville 230 kV T.L. and Center Primary – Clarksboro 230 kV T.L. Replace line traps at Center and East Watkinsville. • The loss of the Klondike – Scherer 500 kV T.L. will thermally overload the Klondike – O’Hara 500 kV T.L.

  28. 2016 ITS-16 Expansion Item ITS-16 • Thomson Primary – Vogtle 500 kV Project • Construct a 500 kV line from Plant Vogtle to the new Thomson Primary 500 / 230 kV substation. • This project is to support the expansion of Plant Vogtle. A new 500 kV T.L. will be required from Plant Vogtle to Thomson Primary to address generator stability issues.

  29. 2017 ITS-17 Expansion Item ITS-17 • South Metro Phase-III Project • Rebuild the existing O'Hara – Bonanza – Hampton – McDonough 115 kV T.L. with double circuit with ACSR 1351 at 230 kV specifications. • Create a new 230 kV circuit from O'Hara to McDonough and add a 230 / 115 kV, 400 MVA transformer at McDonough • Construct a 115 kV T.L. between the Peeksville and Ingram substations. • Project alleviates multiple thermal overloads in the metro Atlanta area.

  30. 2017 ITS-18 Expansion Item ITS-18 • Dorchester 230 kV Project • Construct a 45 mile 230 kV T.L. from Dorchester to West Brunswick. • Install a second 230 / 115 kV transformer and 230 kV capacitor bank at Dorchester. • Reconductor Dorchester – Little Ogeechee 230 kV T.L. • This project is to alleviate multiple thermal overloads for various contingencies in the Savannah Georgia area.

  31. 2017 ITS-19 Expansion Item ITS-19 • Middle Fork 500 / 230 kV Project • Install a 500 / 230 kV transformer at Middle Fork and loop the South Hall – Oconee 500 kV T.L. • Required to support generation expansion in the central Georgia area.

  32. 2017 ITS-20 Expansion Item ITS-20 • Middle Fork – Thomson 500 kV Transmission Line • Construct a new 500 kV Transmission Line from Middle Fork – Thomson (approximately 110 miles) • Required to support generation expansion in the central Georgia area.

  33. 2017 ITS-21 Expansion Item ITS-21 • Hopewell – McGrau Ford 2nd 230 kV Line • Construct a second 230 kV Transmission Line between McGrau Ford and Hopewell. • This project alleviates thermal overloads on the Norcross – Ocee 230 kV T.L. and provides additional voltage support for the North Georgia area.

  34. 2017 ITS-22 Expansion Item ITS-22 • O'Hara 500 / 230 kV Transformer #2 Addition • Install a second 500 / 230 kV transformer at the O'Hara substation. • The loss of the 500 / 230 kV transformer at O'Hara causes Union City's 500 / 230 kV transformer to overload.

  35. 2017 ITS-23 Expansion Item ITS-23 • South Hall – Suwanee 230 kV Transmission Line • Construct 19 miles of 230 kV T.L. from South Hall to Suwanee. • The loss of Norcross – South Hall 500 kV T.L. overloads the South Hall – Shoal Creek 230 kV T.L.

  36. 2018 ITS-24 Expansion Item ITS-24 • East Walton – South Hall 500 kV Transmission Line • Construct a 500 kV T.L. from South Hall to East Walton. • Required to support generation expansion in the central Georgia area.

  37. 2018 ITS-25 Expansion Item ITS-25 • Sharon Springs – Suwanee 230 kV Transmission Line • Construct 14.5 miles of 230 kV T.L. from Sharon Springs to Suwanee. • For the loss of the Norcross – South Hall 500 kV T.L., the South Hall – Spout Springs 230 kV T.L. becomes overloaded.

  38. 2018 ITS-26 Expansion Item ITS-26 • South Coweta – Yates 115 kV Transmission Line • Reconductor approximately 19 miles consisting of multiple sections of the South Coweta – Yates 115 kV T.L. • For the loss of either end of the South Coweta – Yates 115 kV T.L. with Yates unit #3 offline, sections of the South Coweta – Yates 115 kV T.L. become overloaded.

  39. 2019 ITS-27 Expansion Item ITS-27 • Blankets Creek – Holly Springs 115 kV Transmission Line • Construct a second Blankets Creek – Holly Springs 115 kV T.L. • For the loss of the Blankets Creek – Holly Springs 115 kV T.L., sections of the Holly Springs – Nelson 115 kV T.L. become overloaded.

  40. 2019 ITS-28 Expansion Item ITS-28 • Commerce Primary – Middle Fork 115 kV Transmission Line • Reconductor approximately 13.9 miles from Middle Fork to North Commerce Junction. • For the loss of the Middle Fork – South Hall 500 kV T.L. sections of the Commerce Primary – Middle Fork 115 kV Transmission Line will become overloaded.

  41. West • Coordinated Planning • PS (PowerSouth Energy Cooperative) • SMEPA (South Mississippi Electric Power Association) • Southern Company Transmission Coordinated Planning SMEPA PowerSouth

  42. Expansion Item W-1 2009 W-1 East Pelham 230/115 kV Project • East Pelham 230 / 115 kV substation in 2009 • New Ballentrae DS (East Pelham) – Double Oak Mountain 115 kV T.L. • New East Pelham – Alabaster SS 115 kVT.L. in 2010. • Upgrade Gaston – East Pelham 230 kV T.L. to 100° C operation in 2015.

  43. Expansion Item W-2a 2009 W-2a Carriere SW 230 / 115 kV Substation Project • Construct approximately 18.4 miles of 230 kV line and a new 230 / 115 kV Carriere Switching Station located ~ 5 miles north of Picayune 115 kV substation. • Phase in project over time. (2009-2010-2011)

  44. Expansion Item W-2b 2009 W-2b Carriere SW 230 / 115 kV Substation Project • The loss of the Necaise – Spence 115 kV T.L. results in overload of Kiln – Nicholson tap 115 kV T.L. and vice versa. • Phase in project over time. (2009-2010-2011)

  45. Expansion Item W-3a 2010 W-3a • McIntosh – C.A.E.S. 115 kV T.L. • Reconductor 1.74 mile McIntosh – C.A.E.S. bundled (2) 795 26/7 ACSR 115 kV TL with bundled (2) 795 26/7 ACSS @ 160°C design. • Loop Barry S.P. – McIntosh T.S. “B” 115 kV TL into C.A.E.S. and reconductor this TL from C.A.E.S. to McIntosh T.S. with bundled (2) 795 26/7 ACSS @ 160°C design (1.74 miles). • Upgrade the C.A.E.S. and Barry S.P. “B” 115 kV terminals at McIntosh T.S. to 3000 A. Replace main bus at McIntosh T.S. with 2 – 1590 AAC.

  46. Expansion Item W-3b 2010 W-3b • McIntosh – C.A.E.S. 115 kV T.L. • With the new addition of generation at C.A.E.S. and a Washington County #1offline scenario and loss of West McIntosh – C.A.E.S. 115 kV T.L., the McIntosh T.S. – C.A.E.S. 115 kV T.L. exceeds its thermal rating.

  47. Expansion Item W-4 2011 W-4 • Laguna Beach 230 / 115 kV Substation • Install a second 230 / 115 kV transformer at Laguna beach substation. • The loss of the Smith 230 / 115 kV transformer with Smith unit #1 offline overloads the Laguna Beach 230 / 115 kV transformer.

  48. Expansion Item W-5 2011 W-5 • Laguna Beach – Holiday 115 kV • Holiday – Hathaway Tap 115 kV • T.L.s • Construct a new 115 kV T.L. from Laguna Beach – Holiday • Construct 1.25 of double circuit 115 kV T.L. from Holiday – Hathaway Tap. • With Smith unit #1 offline, the loss of Smith 230 / 115 kV transformer causes the Laguna Beach – Lullwater Tap 115 kV to exceed its thermal rating.

  49. Expansion Item W-6 2011 W-6 • Smith – Laguna Beach 115 kV T.L. • Convert the Smith – Laguna Beach 115 kV T.L. to 230 kV operation. • With Crist unit #7 offline, the loss of the Laguna Beach 230 / 115 kV transformer causes the Smith – Laguna Beach 115 kV to exceed its thermal limit.

  50. Expansion Item W-7 2012 W-7 • Mobile Area 115 kV Networking • Construct a new Switching Station. • Create ten new network 115 kV T.L. in the Mobile Metro Area.

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