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  1. Market Data
September 1, 2021

Ontario IESO – Flow Battery Energy Storage System, Canada

By Carmen

The Ontario IESO – Flow Battery Energy Storage System is a 5,000kW energy storage project located in TBD, Ontario, Canada. The rated storage capacity of the project is 20,000kWh.

The electro-chemical battery energy storage project uses flow as its storage technology. The project was announced in 2015.


The Ontario IESO – Flow Battery Energy Storage System is being developed by SunEdison. The project is owned by Independent Electricity System Operator (100%).

The key applications of the project are frequency regulation and renewable capacity firming.

Contractors involved

Independent Electricity System Operator is the owner. SunEdison is the developer. Imergy Power Systems is the technology provider for the project.

Additional information

SunEdison has signed a 10 year agreement with Ontarios ISEO to supply 5 MW, or 20 MWh, of battery storage to the Canadian province. Imergys vanadium redox flow battery technology will be employed. Construction is scheduled to begin in the first half of 2017, with completion slated for later that year.

About SunEdison

SunEdison, Inc. (SunEdison) is a solar energy company that develops and sells photovoltaic energy solutions, and owns and operates clean power generation assets. The company also develops, manufactures and sells silicon wafer for the semiconductor industry. It also offers solar energy services to its clients that integrate the design, financing, installation, monitoring, operations and maintenance functions of the downstream solar market. SunEdison serves commercial customers including national retail chains and real estate property management firms; federal, state and municipal governments; utilities; and customers from the semiconductor industry. The company, together with its subsidiaries, manufacturing facilities and representative offices, operates in the US, Canada, Europe, Asia, Latin America, and Middle East and North Africa (MENA). SunEdison is headquartered in Maryland Heights, Missouri, the US.

The company and some of its domestic and international subsidiaries have filed for reorganization under chapter 11 of the U.S. Bankruptcy Code in April 2016.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.

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