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July 10, 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 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.

IESO
IESO Moving Forward with Competitive Tx Plans
IESO will open some transmission projects to competition, although most will continue being awarded to incumbents.
Ontario Ministry of Energy & Mines
Ontario Integrated Energy Plan Boosts Gas, Nukes
Ontario is putting its chips on nuclear power and natural gas to meet its growing energy demand while directing IESO to incorporate gas distributors and the province’s economic development goals in its system planning.
IESO
Ontario Energy Plan Gives IESO Long ‘To Do’ List
Ontario’s newly released integrated energy plan includes a long "to do" list for grid operator IESO.
Brookfield Renewable
IESO Purchasing 3,000 MW of Energy and Capacity
IESO completed its second medium-term procurement with contracts with 27 wind and natural gas generators.
IESO
IESO Seeks to Shore up Capacity Market

The IESO Technical Panel approved posting for comment several revisions to the ISO’s capacity market rules and manual intended to reduce the occurrence of unfulfilled commitments.

Power Advisory
Operating Reserve Prices Surge in Ontario

The opening of Ontario’s nodal market has been marked by real-time volatility and unusually high operating reserve prices.

Canadian Biogas Association
IESO Sticking with Local Generation Program Design

IESO politely said “no” to many of the stakeholder-requested changes to the design of its proposed Local Generation Program, but noted it will include the raised concerns in its report to the Ontario government in July and signaled it was open to further discussing others before then.


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