IESO’s Planning Outlook: New loads trigger transmission needs across Ontario
The Independent Electricity System Operator’s (IESO) 2026 Annual Planning Outlook (APO), released in March 2026, identifies system needs from 2027 to 2050 and outlines the actions needed to meet them. This annual planning exercise draws on market intelligence, forecast data, models and studies, and includes a long-term projection of Ontario’s electricity needs. For the first time, the IESO has introduced three demand scenarios – Reference, High, and Low – alongside a new “growth margin” concept that distinguishes uncertain and variable sources of demand growth from stable baseline demand.
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