Independent Electricity System Operator (IESO)

The Independent Electricity System Operator is responsible for operating the electricity market and directing the operation of the bulk electrical system in Ontario.
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Stakeholders Urge Further Refinement of NERC Standard Modernization Proposals
Stakeholders mostly said the recommendations to update NERC's standards development process represented a good start but needed further development to ensure a fair process.
IESO
IESO, Stakeholders Ponder Changes to Hourly DR
IESO is reconsidering how it deploys hourly demand response following complaints over partial activations and an increase in standby notices.
IESO
IESO Seeks Input on RFP for 3rd Toronto Transmission Line
IESO is seeking stakeholder input on its first competitive transmission solicitation: a $1.5 billion HVDC line under Lake Ontario that will become the third major supply line for Toronto.
IESO
IESO Holds Firm on Hydro Exclusion, Reserve Price in Long Lead-time RFP
IESO officials held firm on excluding hydro redevelopment projects from the ISO’s Long Lead-Time procurement despite objections from potential bidders.
NERC
IESO Reliability Compliance Plan Focuses on CIP, Modeling, IBRs
IESO is targeting six areas of NERC’s Reliability Standards in its 2026 compliance program, largely continuing a focus on issues it has prioritized since 2023.
Government of Canada
Canada’s Emission Reductions Dependent on Fixing Industrial Carbon Markets
After scrapping most Trudeau-era climate policies, Prime Minister Mark Carney wants to tighten rules over Canada’s industrial carbon markets, which observers say have failed to incentivize emission reductions.
IESO
Ontario OKs Underwater HVDC Line to Toronto
Ontario approved IESO’s proposed $1.5 billion HVDC line under Lake Ontario, which planners say is needed to meet a potential doubling of Toronto’s electricity demand by 2050.
Hydro One
IESO Sees 2026 Demand Cooling from ‘Trade Tensions’
IESO's latest Reliability Outlook reduces its 2026 demand growth projection slightly, citing “international trade tensions.”
IESO
IESO Seeks Comment on Revised Monitoring Requirements
IESO released proposed market rule and manual revisions to require synchrophasor data from storage resources.
Highview Power
IESO Drops Termination Option for Long Lead-time RFP

Responding to opposition from suppliers, IESO said it will not include a termination option in its procurement for long lead-time resources.


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