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PRPA and FOOTHILLS AREA

Meeting of Colorado Task Force On Reliable Electricity Infrastructure Platte River Power Authority (PRPA) Planning Reliable Power Through 2016 September 5, 2006 John Collins. PRPA and FOOTHILLS AREA. Colorado. PRPA Owned by Estes Park, Fort Collins, Longmont, and Loveland. 345 kV.

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PRPA and FOOTHILLS AREA

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  1. Meeting of Colorado Task Force On Reliable Electricity InfrastructurePlatte River Power Authority (PRPA)Planning Reliable Power Through 2016September 5, 2006John Collins

  2. PRPA and FOOTHILLS AREA Colorado PRPA Owned by Estes Park, Fort Collins, Longmont, and Loveland

  3. 345 kV PRPA LOAD-SERVING AREA 230 kV 115 kV FORT COLLINS AULT I-25 LOVELAND ESTES PARK GREELEY ST.VRAIN LONGMONT *

  4. What PRPA is doing to ensure reliability for its customers….. • Lights On “8760” • Generation – use contingency-based planning reserve • Summer peaking, steep load duration curve • Rawhide peaking resource addition(s) • Transmission – use HIGH load forecast for planning • Margin for delayed construction or actual loads > forecasted • 230 & 115 kV, new & upgraded, overhead & underground • Load Delivery Points – require loop service and full breaker isolation • 7 new 115 kV delivery points (1 new sub, 6 existing subs) • Reactive power resources - meet summer peak demand plus reserves

  5. …And through the Foothills Planning Group… • Plan for load growth along I-25 corridor and surrounding communities • Coordinate needs and plans with those of WAPA, PSCo, and TSGT, new interconnections • Rebuild single-ckt 115 kV lines on existing rights-of-way to double-ckt 230 kV capable lines, multiple ownership • TOT 7 short- and long-range studies • A northern Metro Denver import path for PSCo • Voltage stability studies of this importing region

  6. TOT 3 AULT TOT 5 WEAK LINK for TOT 7 TOT 7 ST.VRAIN

  7. TOT Plans….. • Move weak link for TOT 7 away from the heart of PRPA load-serving area • No need to increase TOT 5 capacity for Craig resources • No part of TOT 3

  8. Some challenges to building infrastructure….. • Achieve an optimum route and design while maximizing both reliability and public acceptance • New right-of-way for overhead is time-consuming, can vary by County, can jeopardize in-service date • Rebuild two circuits of higher voltage on right-of-way where one circuit exists • PRO: Good steward of land use • PRO: Generally better received by public and quicker to build • CON: Reliability risks during construction and less route diversity • CON: Encroachments can alter line design or route • “Scope Creep” from overhead to underground

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