Methods to Derate Hydro Sustained Peaking Capability into a SingleHour Value

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Methods to Derate Hydro Sustained Peaking
Capability into a Single-Hour Value

• Resource Adequacy Technical CommitteeAugust 24,
  2007Portland, Oregon

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Options

• Trapezoidal Model
• Genesys
• HOSS
• Other, e.g. Columbia Vista

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Objectives for Review

• Assess the sustained peaking capability of the
  hydro system
• Critical hydro (what about summer?)
• No emergency hydro operations
• No additional Canadian releases
• No spot market purchases assumed
• No hydro flexibility

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Objectives for Review

• Assess the sustained peaking capability for
  various peak durations
• Consecutive hours or not? Does it matter? Pros
  and Cons.
• Different values for each month?
• Compute a derate for sustained peaking capability
  for WECC use

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Trapezoidal OutputHydro Capacity vs. Monthly
Energy
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Derate for 12-Hr DurationHydro Capacity vs.
Monthly Energy
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Derate using Trapezoidal
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Derate using Genesys
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Derate using HOSS

• Run appropriate peaking study
• Develop method to assess non-fed peaking
  capability
• Sum up total system peaking capability
• Same method as Genesys to get derate Derate
  1-Hr cap 12-Hr Avg cap

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Options Pros and Cons