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December 5, 2025

IESO

Ontario’s Independent Electricity System Operator is a government organization with a mixture of commercial and public-policy goals, owned by the government of Ontario. It was created to prepare for deregulation of the province’s electrical system and is governed by a board whose directors are appointed by the provincial government.
IESO
IESO Seeks to Fill Growing Regulation Needs
IESO will seek to fill its growing need for regulation services through competitive bids but will resort to bilateral procurements if there is insufficient interest.
IESO
IESO Sees Improved ‘Trust’ Ratings in Survey
IESO saw “across the board improvement” in its 2024 stakeholder and community engagement survey.
IESO
IESO Seeks Feedback on Revised Storage Model
IESO opened discussions on new rules for storage facilities and hybrid resources that will enable the provision of regulation service.
IESO
Canadian Utilities Push Action on Net-zero Goals, Tax Credits
Canada’s utilities are encouraged by the country’s new government but say legislation to fast-track high-priority infrastructure projects doesn't address needs for permitting reform and more flexible clean energy targets and investment tax credits.
IESO
IESO Planners Using ‘Adaptive Pathways’ to Address Load Growth Uncertainty
IESO transmission planners are using “adaptive pathways” to account for uncertainty over future load growth.
IESO
IESO Capacity Market Rule Changes Advance

IESO’s Technical Panel approved measures to reduce unfulfilled capacity commitments and began discussion of proposed changes for how the ISO breaks ties in its annual auctions.

IESO
IESO Officials Deny Favoring Gas Resources in Upcoming Procurement
Potential energy suppliers in IESO’s second long-term energy and capacity procurement said the ISO's auction rules favor natural gas generators by insulating them from most of the cost of gas transmission upgrades.
IESO
IESO to Expand Synchrophasor Data Requirements to Storage

IESO proposes to update its synchrophasor data requirements to include storage resources as part of its effort to expand the use of phasor measurement units in Ontario.

IESO
IESO Seeking Feedback on Commercial HVAC Demand Response Program

IESO plans to introduce its first electricity demand-side management program in 2026, focused on commercial HVAC systems during summer to lower peak demand as load grows in Ontario.

IESO
IESO Eyes New Tie-break Rules for November Capacity Auction

IESO will revise its procedure for breaking capacity auction ties in time for the 2025 contest in November.


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