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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 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.

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.

Canadian Biogas Association
Suppliers Call for Changes to IESO Local Generation Proposal

Electricity cooperatives, independent power producers and biogas generators have asked IESO to reconsider key components of its proposed Local Generation Program.

GE Hitachi Nuclear Energy
Counterflow: The SMR Fission Vision in Ontario
Experience with small modular reactors (like other nuclear) is for massive cost overruns, writes columnist Steve Huntoon.

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