California ISO - Documents By Group

HomeCurrently selected

Exceptional dispatch
Under MRTU, reliability requirements that cannot be resolved through the California ISO market software will be met by manually issued Exceptional Dispatches. Units receiving Exceptional Dispatches for energy will be paid the higher of their bid price or the Locational Marginal Price (LMP). The ISO expects that the frequency and duration of Exceptional Dispatches will be very limited under MRTU. However, the potential cost of such Exceptional Dispatches could be significant if generators receiving such dispatches are able to exercise local or temporary market power by submitting extremely high energy bids. Therefore, the ISO is considering modifications to the MRTU to mitigate the potential for market power by units receiving Exceptional Dispatches for energy.
- Outcome
  Exceptional Dispatch was implemented with the new market deployment on April 1, 2009 per the FERC Order received on Feb. 20, 2009. As part of the order, the ISO will publish a monthly Exceptional Dispatch report with FERC, the first of which was published on May 15, 2009. To assist stakeholders in understanding how Exceptional Dispatch is used in the ISO Market, the ISO published a Technical Bulletin on May 13, 2009. The Technical Bulletin also explains instruction type codes and mitigation rules that will be implemented four months after initial deployment on Aug. 1, 2009. — FERC approval: Sept. 2, 2009; Tariff amendment filing: June 27, 2008 (ER08-1178)
- Exceptional dispatch - papers and proposals
- Exceptional dispatch - tariff language
- Comments on straw proposal 24-Apr-2008
- Comments on white paper 04-Apr-2008
- Comments on mitigation rule for exceptional dispatches under MRTU
- Comments 12-Dec-2007
- Comments on tariff language