Proposed change to curtail wheel-through transactions as a control action
April 21, 2016
The IESO is proposing changes to Market Manual 7.2: Near-Term Assessments and Reports. The proposed change would add a new condition in section 1.3.4: IESO Control Actions (Nuclear Manoeuvres Forecasted or Occurring) to allow the IESO to curtail wheel-through transactions if a nuclear shutdown is scheduled in future hours concurrent with wheel-through transactions.
Curtailing wheel-through transactions to prevent a nuclear shutdown may be the appropriate market response during this circumstance given:
- The IESO's scheduling tool does not account for all of the implications of a nuclear shutdown for future hours – including the fact that a nuclear unit can take up to 72 hours to re-start after a shutdown; and
- The fact that the next set of economic resources after the nuclear shutdown are likely to have limited flexibility to be dispatched in this timeframe.
The IESO will host a stakeholder webinar on April 28 at 10:00 am to discuss the proposal in more detail, answer questions and outline next steps. Stakeholders interested in participating in this webinar can contact email@example.com for further details and to register.