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December 5, 2025

Market Renewal Program

IESO
Higher Prices Stressing Ontario Mines, Greenhouse Growers
Higher prices under Ontario’s renewed market are causing heartburn for mines and greenhouse growers, stakeholders told IESO.
IESO
IESO Tweaking Make-whole Payments for Operating Reserves
IESO proposed rule changes to eliminate unwarranted make-whole payments to operating reserve providers under Ontario’s nearly eight-month-old Market Renewal Program.
IESO
IESO Implementing ‘True-up’ on Renewed Market Rules
After more than six months of operations under its Market Renewal Program, IESO is implementing “non-substantive” rule changes it says will improve clarity and alignment.
Oxford Properties
Stakeholders Press IESO on Governance, Transparency
IESO’s plan to give its staff authority to set market parameters without approval by the Board of Directors has sparked a debate over the ISO’s governance and the role of stakeholders.
Ontario Energy Board Market Surveillance Panel State of the Market Report 2023
Ontario Market Monitor Revamps Techniques for IESO Nodal Market
Ontario’s energy regulator is learning new ways to identify inefficiencies and malign behavior under IESO’s Market Renewal Program.
IESO
Ontario Nodal Market Nearing ‘Steady State’ After Nearly 4 Months
IESO officials say they are shifting from correcting implementation problems to seeking structural improvements in their nodal market.
IESO
Ontario Nodal Market Operating as Expected at 1-month Mark

Ontario’s nodal market is showing promise one month after its launch, with improved price certainty, increased day-ahead trading and LMPs reflecting expected congestion patterns, IESO officials say.

Yes Energy
IESO Nodal Market Launch Successful
Ontario's IESO successfully launched its nodal market on May 1, reporting few glitches during its rollout.
Yes Energy
Ontario Introducing Nodal Market May 1
IESO is scheduled to launch its new nodal market May 1, a change it says will save Ontario $700 million over the next decade through reduced out-of-market payments and increased efficiency.
IESO
FAQs: Ontario’s Shift to a Nodal Market
Yes Energy's Emily Merchant provides answers to some frequently asked questions about IESO's new nodal market.

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