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.
18-Month Outlook: An Assessment of the Reliability and Operability of the Ontario Electricity System from January 2017 to June 2018 (Released December 15, 2016)
- 18-Month Outlook Interim Update: in Microsoft Excel Spreadsheet format (Released February 6, 2017)
18-Month Outlook - Tables from the current Outlook in Microsoft Excel spreadsheet format (Released December 15, 2016)
Ontario Demand Forecast issued semi-annually, this document provides more detail about the 18-month forecast of electricity demand for Ontario. (Released December 15, 2016)
Ontario Transmission System provides specific details on the transmission system, including the major internal transmission interfaces and interconnections with neighbouring jurisdictions. (Released December 15, 2016)
Methodology to Perform Long Term Assessments contains information regarding the methodology used to perform the demand forecast, resource adequacy assessments, and transmission adequacy assessments in this Outlook report. (Released December 15, 2016)
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.
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.