1. Technical Advisory Subcommittee Quarterly Meeting August 15-16, 2016
Tom Miller, TAS Chair
Western Electricity Coordinating Council

2. Agenda item5- Contingency Reserves
Western Electricity Coordinating Council

3. Contingency Reserve Modeling
SOURCE: TEPPC 2026 Common Case Release Notes
Hourly Flexibility Reserve: manages the variability and uncertainty associated with variable generation resources like wind and solar: proxy for regulation and load following
ABB Flex Reserve Tool
SOURCE: Xiaobo Wang- CAISO Reserve Modeling Pertinent to FERC Order 789
Western Electricity Coordinating Council

4. Flexibility Reserve Update
Flexibility Reserves Component
Reflect the coincidental system variability and are unique to the reference day data
Impact unit commitment in the PCM simulations
Composite Reserves shortfalls may indicate system reliability issues
Concern is that using Flexibility based on old data may result in compromised results from the 2026 Common Case
Stakeholders have depended on WECC to have these calculations in the data-set
ILLUSTRATIVE EXAMPLE
Western Electricity Coordinating Council

5. Western Electricity Coordinating Council
Questions or Comments
Western Electricity Coordinating Council