The California ISO as published historical resource adequacy (RA) import aggregate data as a follow up on its commitment to provide this data as part of the transparency enhancements suggested by stakeholders in the Transmission Service & Market Scheduling Priorities Phase 1 initiative. The data is available on the Reliability Requirements webpage, under the Wheeling and Resource Adequacy Imports Aggregate Data heading.

The historical RA import aggregate data is based upon monthly RA plans over 24 months from January 2020 through December 2021. The data is aggregated for total MWs shown at individual import tie points to the ISO system, by month. This data is intended for informational purposes only.

Stakeholders also requested the ability to provide input on the format of how this data is presented. Please reach out to isostakeholderaffairs@caiso.com if you have suggestions for how to improve the format or presentation of the available data.