The ISO had one exceptional dispatch of non-RA in the month of September 2019.
The report includes the following:
name of the resource;
utility service area and local capacity area (if applicable);
maximum non‑RA dispatched in response to the event (MW);
how capacity was procured (for example, by residual unit commitment or exceptional dispatch); and
reason the non‑RA capacity was dispatched (either through market optimization or exceptional dispatch).
The “maximum” non-RA capacity includes non-resource adequacy capacity, which includes capacity payment mechanism capacity, committed as a result of physically binding start-up instructions and incremental energy dispatches. Exceptionally dispatched non-RA capacity will be reported separately from in-market non‑resource adequacy capacity for each trading day. Exceptional dispatches for the purposes of testing will not be included. Maximum non resource adequacy capacity will not include any non‑RA capacity below the resource’s minimum operating level if the resource has sold any capacity below that level as resource adequacy capacity. When this occurs, the RA must offer obligation applies to the minimum operating level (PMin) available.
Market commitments and dispatches result from a security constrained optimization based on bids and self-schedules from all capacity (RA and non RA) that has submitted bids. The ISO may also issue exceptional dispatches to commit and dispatch resources, for which the ISO uses available information to select the most economic resources for exceptional dispatch that can meet the reliability need. This generally results in exceptional dispatches only of RA capacity.