Reliability Outlook

Cover of Reliability Outlook

The quarterly Reliability Outlook (formerly known as the 18-Month Outlook) presents Ontario’s demand forecast and associated drivers, resource adequacy projections and the assumptions that inform them, as well as an assessment of operability and the province’s transmission assets.

As part of the IESO’s commitment to open and transparent planning, beginning in December 2018, the IESO extended the traditional 18-month planning horizon for an additional 42 months, providing a five-year assessment of reliability. Published every June and December, these extended outlooks address the drivers that can affect resource adequacy, and require the IESO to address associated reliability risks through outage management.

In addition, The IESO is making its Transfer Capability Assessment Methodology for the Near-Term Transmission Planning Horizon publically available. The Ontario Transmission System document was consolidated with this Transfer Capability Assessment Methodology document. Operating Limits previously documented in the Ontario Transmission System document are now available in the Reliability Outlook Tables.

Here is the most recent issue and related documents.

Summer 2019:  July 2019 to June 2024 (Released June 20, 2019)

For earlier reports, including Ontario Reliability Outlook and 10-year Outlooks see the Document Library.

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 Reliability Outlook and other reliability assessments, see the Calendar for Submission of Reliability Assessments Information.

Related Information

Ontario Reserve Margin Requirements: 2019 - 2023 reports on the operational planning reserve requirements to meet the NPCC resource adequacy design criterion over a five-year window.