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Forecasts & 18-Month Outlooks

​The IESO regularly publishes an 18-Month Outlook, which presents the IESO's assessment of the reliability of the Ontario electricity system over the short term. This quarterly publication assesses whether the existing and proposed generation and transmission facilities are adequate to meet Ontario's needs.

18-Month Outlook: Winter 2017

The IESO issues its 18-Month Outlook each quarter. Here is the most recent issue and related documents.

Submitting of Reliability Assessment Information

Market participants are required to provide information to the IESO to enable it to conduct reliability assessments.  These submissions are required each calendar year.

For submission deadlines for input information for the 18-Month Outlook and other reliability assessments, see the Calendar for Submission of Reliability Assessments Information.

Previous 18-Month Outlooks and Reliability Reports

Ontario Reserve Margin Requirements

The Ontario Reserve Margin Requirements reports on the operational planning reserve requirements to meet the NPCC resource adequacy design criterion over a five-year window.

Notice: The posting of submissions on the IESO's Web site is done for the convenience of market participants and other interested visitors to the IESO's site. When requesting or receiving submissions from market participants and/or industry stakeholders, it is the normal practice of the IESO to post the submissions on the IESO Web site. The IESO reserves the right to revise or withdraw any such submission at any time without further notice should the submission include, in the IESO's opinion, any defamatory or other inappropriate provisions. Participants are reminded that all the material that they submit may be published and that, in making a submission, their permission to publish the material is deemed to be granted.