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El Campo – Vanderbilt 69 kV Project – Status report

This report provides an overview of the proposed options for rebuilding the existing 69 kV transmission system in Jackson County, TX to accommodate the new electric load addition. The options include building a new 345 kV station and constructing a new 69/138 kV line. The costs, benefits, and future load capacity implications of each option are discussed.

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El Campo – Vanderbilt 69 kV Project – Status report

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  1. El Campo – Vanderbilt 69 kV Project – Status report Ehsan Ur Rehman Planning Engineer ERCOT RPG Meeting

  2. Project Background • Jackson Electric Cooperative (JEC) Load addition • Areas surrounded by Jackson, Victoria and Wharton Counties are part of Eagle Ford shale formation and are newly discovered oil exploration areas • Oil reserves are estimated to be 3 billion barrels and is said to be the sixth largest oil field discovered in the USA • Oil and gas exploration leads towards significant amount of load addition • Approx. 118 MW of new electric load will be added in Jackson County, TX by the end of 2013 • Existing 69kV (STEC) system is composed of 4/0 ACSR conductor (45MVA) and cannot support the new load addition RPG Meeting

  3. Map of the Area of concern RPG Meeting

  4. Base Case Model & Assumptions • Study Cases • The latest 2014 & 2016 Reliability Cases from the 2011 5YTP • Load Changes • Load was updated/increased in the area of concern based on STEC’s submittal • 2016 Case:- STEC load: 1503 MW • 2014 Case:- STEC load: 1395 MW • Generation Changes • Monticello 1 & 2 (in-service) • Sam Bertron 1 & 2 (in-service) • Greensbayou5 (in-service) • Panda Temple 1 (not available in 2014) • All other mothballed units (turned off) RPG Meeting

  5. Overloads on existing system due to updated loading in 2014 RPG Meeting

  6. Project Options • Option 1 (345 kV) • Build a new 345 kV station near Cordelle and loop the STP – Elm Creek 345 kV line into it • Add a 345/138 kV auto-transformer • Build a new 138 kV line (approx. 1.5 miles) to the new load serving 138/24.9 kV distribution system • Add 9.6 Mvar capacitor banks at Cordele and Ganado Switch • Total Cost :- $24.5 million • Facts • The load will be radially connected to the 345 kV station • The 18.7 MW of load at Cordelle 69 kV still requires Vanderbilt – Eltoro and Ricebird – Round Mott 69 kV line to be upgraded • No New load can be served through the existing weak 69 kV transmission system without these upgrades RPG Meeting

  7. Option 1 (345 kV) topology with entire load moved to the new distribution station RPG Meeting

  8. Loading after moving the Cordelle load (18.7 MW) served radial from 345 kV (2016 case) RPG Meeting

  9. Project Options (Cont.) • Option 2 (69/138 kV rebuild) • Rebuild the existing 69 kV line (22 miles) from El Campo and Cordelle as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively • Rebuild the existing 69 kV line (13 miles) from Cordelle and El Toro switch as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively • Rebuild the existing 69 kV line (13.6 miles) from El Toro and Vanderbilt switch as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively • Install 9.6 Mvars of capacitor banks at Louisville 69 kV, Ganado 69 kV, Cordele 69 kV and ETP sub 138kV • Construct a new 138 kV double circuit line (on a new R.O.W) from the ETP substation to a single new 84 MW load • Total Cost :- $ 27.33 million RPG Meeting

  10. Option 2 Upgrades RPG Meeting

  11. Option 2 (n-1) results for 2014 RPG Meeting

  12. Option 2 (n-1) results for 2016 RPG Meeting

  13. G-1 analysis for Option 2 • Option 2 (rebuilding of existing 69 kV and adding 138kV lines) was analyzed under G-1 conditions • The biggest combined cycle train at Colorado Bend (252 MW) was turned off. • Nursery – Rayburn 69 kV line was shown overloaded in both 2014 and 2016 RPG Meeting

  14. Facts about Option 2 upgrades • Load will not be radially connected with Option 2 • More load can be connected to the 69 kV system with Option 2 in future • Nursery – Rayburn 69 kV line has to be upgraded with Option 2 upgrades RPG Meeting

  15. Summary Summary Rebuilding the existing 69 kV transmission system (Option 2 upgrades) seems to be a better option as additional load may be connected to the existing 69 kV substations in future. However, after performing the G-1 analysis, it is mandatory to include Nursery – Rayburn 69 kV upgrade as a part of Option 2 Upgrades to serve future loads additions. Thus the final Option 2 Upgrades are listed on the following slide RPG Meeting

  16. Summary (Cont.) • Updated Option 2 Upgrades (69/138 kV rebuild) • Rebuild the existing 69 kV line (22 miles) from El Campo and Cordelle as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively • Rebuild the existing 69 kV line (13 miles) from Cordelle and El Toro switch as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively • Rebuild the existing 69 kV line (13.6 miles) from El Toro and Vanderbilt switch as a double circuit 69 KV & 138 kV with 122 MVA and 240 MVA (emergency rating); respectively • Install 9.6 Mvars of capacitor banks at Louisville 69 kV, Ganado 69 kV, Cordele 69 kV and ETP sub 138kV • Construct a new 138 kV double circuit line (on a new R.O.W) from the ETP substation to a single new 84 MW load • Upgrade Nursery – Rayburn 69 kV line such the the Circuit Rate B is 122 MVA • Total Updated Cost :- $ 28.15 million RPG Meeting

  17. Questions? March 12, 2010 RPG Meeting

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