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Southwest Utah Area Study Review

A review of the Southwest Utah area study, covering the transmission substation infrastructure, load growth projections, system improvements, and transmission reliability improvements.

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Southwest Utah Area Study Review

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  1. Nathan Wilson/Talmage Daley Need to review the LOADS before Friday Southwest Utah Area StudySeptember 2014

  2. SOUTHWEST UTAH STUDY • PacifiCorp: • Parowan • Cedar City • Springdale • Twin Cities • Ivins • Municipalities/REA: • St. George • Hurricane • Santa Clara • Dixie/Escalante REA Nathan Wilson/Talmage Daley

  3. Southwest Utah Study • Covers ~ 1,800 square miles of area in Iron and Washington Counties. • There are 6 transmission subs in the area – Parowan Valley, Three Peaks, West Cedar, Red Butte, Middleton and St. George. • Several power entities within study area. • There are 44 substations, 4 being transmission customer substations. • Transmission voltages studied include 69 kV and 138 kV.

  4. Load Growth • Base System Loads • Summer 2013: 564 MW • Winter 2013-2014: 371 MW • Growth • Summer: 2.7% • Winter: 2.7% • Projected System Loads • Summer 2017: 620 MW • Winter 2017-18: 411 MW

  5. System Improvements • Hurricane West Substation to accommodate new points of delivery. • Designed for future expansion to 345 kV.

  6. System Improvements • Apple Valley 69-12.47 kV Substation 2015 • Required by agreement with Hurricane City. • 69 kV source from Middleton via Windy Ridge Substation. • Servesexisting 34.5 kV load in Apple Valley. • Total Estimated cost: $4,000,000

  7. Transmission Reliability Improvements • Coleman Substation Reliability • Circuit breakers on both sources serving 138 kV bus. • Cuts exposure in the Cedar City area by two-thirds.

  8. Construction Schedule Summary

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