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Eastern Nevada Transmission Intertie (EN-ti)

Eastern Nevada Transmission Intertie (EN-ti). January 24, 2008 Las Vegas, NV. Eastern Nevada Transmission Intertie (EN-ti) Path Rating Study, Phase II Colorado River Transmission Study Group Meeting, . Agenda. EN-ti and EEC: Description EN-ti and EEC: Current project status

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Eastern Nevada Transmission Intertie (EN-ti)

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  1. Eastern Nevada Transmission Intertie (EN-ti)

  2. January 24, 2008 Las Vegas, NV Eastern Nevada Transmission Intertie (EN-ti) Path Rating Study, Phase IIColorado River Transmission Study GroupMeeting,

  3. Agenda • EN-ti and EEC: Description • EN-ti and EEC: Current project status • EN-ti and EEC: Design study results • WECC Rating Review Process: Current status • Phase II Study: • Study Scope & Plan • Non-Simultaneous & Simultaneous EN-ti to Centennial case preparation • Comments received & case corrections • Contingency analysis • Next Steps

  4. Ely Energy Center and Eastern Nevada Intertie Project: Nevada Map

  5. Ely Energy Center & EN-ti Projects • EEC 500 kV Switching Station • EEC – Robinson Summit 500 kV No. 1 & 2 Transmission Lines • Robinson Summit 500/345 kV Switching Station • Fold of Falcon – Gonder 345 kV Line Into Robinson Summit Substation • Series compensation on Falcon – Gonder 345 kV Line • Harry Allen – Robinson Summit 500 kV No. 1 Transmission Line: “Eastern Nevada Transmission Intertie” (EN-ti): 236 mi, 70 % series compensated, reactors, single-pole switching • Harry Allen 500 kV Improvements for EEC/EN-ti

  6. Simplified Robinson Summit Substation One-line Diagram

  7. White Pine Energy Center / Great Basin Transmission Interconnection

  8. Purpose and Justification of the EN-ti & EEC Projects • Interconnect SPPC and NPC Systems • 1,550 MW of new resources to Nevada Power loads • 300 MW of new resources to Sierra Pacific loads • Deliver renewable energy & future IGCC to Southern Nevada • Possible interconnection to the North (toward Midpoint 500-kV) • Interconnect White Pine Energy Center • Point-to-point transmission service for Great Basin Transmission additions

  9. Ely Energy Center and Eastern Nevada Intertie Project: One-Line Diagram

  10. EN-ti & EEC Project Status En-Ti Rating Process Description • Project initiated in 2006 • BLM Line & Plant permitting status: • In process (cultural surveys underway) • Is expected to take 7 months to 1 year longer, which would likely delay the project, with the COD of EEC unit # 1 to be moved at least from 2011 to 2012 • EIS Plant permitting: in process; SPR is about to obtain the air quality permit

  11. EN-ti & EEC Project Status (Continued) En-Ti Rating Process Description • Specifications for series compensation and shunt reactors are in process • Long-lead equipment production slots are reserved • Design Study: underway EMTP, PSS, SSR studies; a number of alternatives is still under consideration • Major Equipment: Specifications for autotransformers, PSTs finalized • Generation: SPR prepared RFPs, initiated bids for major equipment (boilers, turbine generators)

  12. EN-ti & EEC Design Studies: Major Results En-Ti Rating Process Description • EN-ti Series and shunt compensation: • Line over-voltages due to step-voltages at the series capacitors terminals (see Figure 1) • Recommended: increase EN-ti line max insulation level from 550 kV to 600 kV • Single-pole reclosing (secondary arc extinguishing) and line energization conditions • Recommended: Shunt reactors: 2×100 Mvar + 1,200 Ω neutral reactors at each end of EN-ti line • Recommended: Shunt reactors: 48 Mvar at Falcon and Robinson 345 kV

  13. EN-ti Voltage Profile Under Heavy Loads Figure 1:

  14. EN-ti & EEC Design Studies: Major Results (Continued) • Defined voltage domains of EN-ti and 345 kV system for normal operation (see Figure 2), which revealed additional operational constraints • Recommended: set Robinson – Falcon transfer limit to 600 kV and install a 48 Mvar bus reactor at Falcon 345 kV

  15. EN-ti & 345 kV RS-Falcon Voltage Profiles Figure 2: Normal Operations Voltage Domains

  16. EN-ti & EEC Design Studies: Major Results (Continued) • Delayed current zeros: EEC BKR clearing time increased to ~5 cycles • Recommended: specify 500 kV BKRs at EEC to have a capability to interrupt fault current in a network configuration that has a very high X/R ratio, which produces two effects that are detrimental to breaker fault current interruption: • delayed current zeros, and • high dc offset.

  17. EN-ti & EEC Design Studies: Major Results (Continued) • Major Equipment at Robinson Summit : • Autotransformers: 2×525 MVA (E=840MVA) • PSTs: 2×600 ±48°; Transformers and PSTs impedances Z=4% (based on angular stability requirements) • EMTP, PSS: currently are ongoing • SSR studies: ongoing (frequency scans, etc.). Bypassing of SC @ Robinson or TCSC may be required

  18. EN-ti WECC Rating Review and Study: Status En-Ti Rating Process Description • SPR Initiated WECC Regional Planning Process, Regional Review Group Formed in Jan-2006 • Initiated Phase I in Oct-2006 • Comprehensive Progress Report Phase I submitted on Nov-9-2006 and approved by the PCC chair on Feb-26-2007 after 60-days review

  19. EN-ti WECC Rating Review and Study: Status (Continued) En-Ti Rating Process Description • Regional Project Report submitted on Jan-25-2007 and approved by the PCC chair on Feb-26-2007 after 30-days review • Phase II Status to EN-ti Project has been granted on March 02, 2007

  20. EN-ti Phase II Project Review Group

  21. Phase II Study Cases Phase II EN-ti Study • Non – Simultaneous cases • Pre-Project, 2014hs • N-S 2,000 MW, 2014hs; 2X750MW @ EEC + 2,000 MW from SPPC to NPC CA + EN-ti (studied at Phase I) • S-N 1,000 MW, 2014hs; 0 MW @ EEC + 1,000 MW from NPC to SPPC CA + EN-ti

  22. Phase II Study Cases (Cont) Phase II EN-ti Study • Simultaneous EN-ti North to South & Centennial case • Created by stressing Centennial to 3,000 MW (new definition used) in the N-S non-simultaneous case • 2014hs; EN-ti N-S 2,000 MW + Centennial 3,000 MW; 2X750MW @ EEC + 2,000 MW from SPPC to NPC CA + EN-ti

  23. Phase II Study Cases (Cont) • Revisions 0 – 2 have been sent to the PRG & WATS electronically in February – March 2007 and responses and comments received and included in the Study Plan. All three cases were discussed during WATS/PRG teleconference on April-17-2007 • Updated cases were sent out for PRG/WATS review on 10/23/07 and again, after USE/SDG&E/SCE comments and respective corrections on 12/03/07

  24. Next Steps Rating Study Status Study Scope Study Results Next Steps • Complete transient and post- transient studies for non-simultaneous and Centennial cases • EOR/WOR/Path 63 • TOT2B/2C • GBT 500 kV Line • Sensitivities

  25. Questions?Thank you For Listening and Participating!

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