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Appendix D of 2014 TEPPC Study Program – Study Case Scoping Form
TEPPC 2013 & 2014 Study Programs
Study Case Scoping Form
The purpose of this document is to define the overall scope of a TEPPC study case so that the study requestor,
TEPPC, and the WECC staff have a common understanding of the expectations and limitations of the study that
will be completed.
Study Case Name
Wind Forecasting Study
Date of Adoption
5/22/2014
Case Number
PC17
Study Timeframe
10-Year
Study Requestor
ColumbiaGrid
Priority
High
Study Case Summary
Over Generation Study: Study the level of historical wind spill in the Northwest. Our rationale for this is
that the BA’s modeled in the studies are electrically much larger than those in place today. Also, the
models have much better foresight than exists today. If the hourly output of upcoming wind generation is
known at the time of unit commitment, then commitment and ramping of other generation can be
optimized to take advantage of the wind. However, wind forecast models in the day-ahead timeframe are
presently not very accurate. The purpose of this study would be to test the impact of the "perfect foresight"
assumption on variable production costs and transmission congestion.
The hypothesis that would be tested by this study is that the perfect foresight assumption for wind may
cause an underestimation of production costs, transmission path congestion and wind spill if thermal units
must remain online at minimum generation during high wind events rather than shutting down. The test
case would use different wind curves for commitment and dispatch, reflecting limitations of forecasting
tools.
Key Questions to be Answered/Addressed by the Study -This information will be used to identify data inputs required for the
study as well as key outputs that should be communicated back to the study requestor.
1. What is the impact of the perfect foresight assumption for wind due to production cost in the 2024 Common Case?
2. What does it do to conjestion and wind spill?
3.
4.
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Study Case Tasks
Requestor Tasks
1.
Develop case assumptions and targets for evaluating
results in the 10-year horizon.
2.
Review & provide comments on study results and report
Responsible Party
Completion Date
3.
Staff or Work Group Tasks
Responsible Party
Completion Date
1. Support scoping process
WECC
TBD
2. Review scope and advise on synergistic efforts to
inform case development
3. Implement desired study assumptions
WECC
TBD
WECC
TBD
4. Run study and report results
WECC
TBD
5.
Key Study Limitations -What issues will not be addressed by this TEPPC study due to limitations in time, resources, or modeling tools?
1.
2.
3.
4.
Other Study Information – link to background material (reports/analysis completed in support of study) and or study results