Meeting of Colorado Task Force On Reliable Electricity Infrastructure Platte River Power Authority P

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Meeting of Colorado Task Force On Reliable
Electricity InfrastructurePlatte River Power
Authority (PRPA)Planning Reliable Power Through
2016September 5, 2006John Collins
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PRPA and FOOTHILLS AREA
Colorado
PRPA Owned by Estes Park, Fort Collins, Longmont,
and Loveland
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345 kV
PRPA LOAD-SERVING AREA
230 kV
115 kV
AULT
FORT COLLINS
I-25
LOVELAND
ESTES PARK
GREELEY
ST.VRAIN
LONGMONT

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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 gt
  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

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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

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

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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