Aecon Group Secures 150 MW Simcoe Battery Storage Project in Ontario with 20-Year IESO Contract

Ownership and Partnership Structure of Simcoe Battery Project

The Simcoe Battery Project is being developed through a multi-stakeholder partnership emphasizing Aecon's dedication to integrated project delivery and Indigenous collaboration. Ownership partners include Aecon Concessions, Six Nations of the Grand River Development Corporation (SNGRDC), Mississaugas of the Credit Business Corporation (MCBC), Sitka Power Inc., and NRStor. This structure aligns with Aecon’s strategy of embedding Indigenous partnerships as a core element of project development.

The partnership model builds on experience from the Oneida Energy Storage Project, operational since May 2025, which involved the same Indigenous partners, NRStor, and construction partner Aecon-Six Nations (A6N). This collaborative approach highlights Aecon’s commitment to inclusive governance in Ontario’s energy storage sector.

Revenue Framework and 20-Year IESO Contract

The Simcoe Battery Project will operate under a 20-year contract with IESO, generating multiple revenue streams. The ownership group will receive capacity payments for capacity services, supplemented by revenues from energy sales into Ontario’s electricity grid and ancillary services. This diversified revenue model supports long-term operational sustainability and investment returns.

Capacity payments provide contracted revenue certainty, a key advantage in Ontario’s evolving electricity market. Additional income from energy arbitrage and ancillary services offers exposure to real-time grid dynamics and market pricing, potentially enhancing returns beyond base capacity payments.

Aecon’s Role as EPC Contractor

In addition to its equity stake, Aecon will serve as the exclusive Engineering, Procurement, and Construction (EPC) contractor for balance of plant works. The announcement states that the EPC agreement is expected to be finalized soon, though formal execution remains pending as of July 28, 2026.

This dual role aligns with Aecon’s "One Aecon approach," leveraging expertise across operating sectors to convert development and construction capabilities into long-term concession opportunities. This structure enables Aecon to earn near-term construction revenues while maintaining long-term ownership benefits through its Concessions division.

Expansion of Aecon’s Ontario Battery Storage Portfolio

The Simcoe Battery Project significantly expands Aecon’s presence in Ontario’s battery energy storage market. Aecon’s portfolio now represents approximately 1 GW of delivered or planned projects, including the operational Oneida Energy Storage Project, completed York and Goreway Battery Energy Storage Systems (BESS), and ongoing South March and Trail Road BESS projects.

This cumulative capacity reflects Ontario’s accelerating battery storage deployment to integrate renewables and enhance grid reliability. Aecon’s involvement across multiple project stages—from construction to operation—demonstrates a diversified strategy to capture value amid Ontario’s energy transition. The Simcoe project, with a 2030 commercial operations target, extends Aecon’s pipeline into the medium term, supporting sustained revenue visibility.

Project Details and Grid Reliability Benefits

The Simcoe Battery Energy Storage System will feature 150 MW instantaneous power capacity and 1,200 MWh total energy storage, making it a major asset for Ontario’s grid. Steve Nackan, Executive Vice President and President of Aecon Concessions, stated the facility will "strengthen grid reliability and support the integration of renewable generation—helping to provide the resilient energy foundation and critical storage capacity required to support economic growth and meet Ontario’s growing electricity demand."

Battery storage systems of this scale address key challenges such as renewable generation variability, peak demand smoothing, and grid frequency stability. IESO’s 20-year capacity services contract underscores confidence in the project’s long-term grid service reliability.

Location and Development Schedule

Situated in Norfolk County, Ontario, the Simcoe Battery Project targets commercial operations by 2030, allowing approximately four years for development and construction from the July 2026 announcement. This timeline aligns with the complexity of utility-scale battery storage projects, though detailed milestone and capital expenditure information has not been disclosed.

The announcement does not specify a construction start date, and finalization of the EPC agreement remains pending. Stakeholders should watch for updates on contractual milestones, regulatory approvals, and any changes to the 2030 operational target.

Aecon’s Competitive Standing in North American Power Infrastructure

Aecon is positioned as "a leader in Canada’s power generation and battery storage sector" with broad North American infrastructure expertise. Its participation in Simcoe, Oneida, York, and Goreway projects establishes a strong track record in Ontario’s battery storage market, providing competitive advantages for future contracts as battery deployment grows across North America.

By separating construction and concessions operations, Aecon monetizes projects through multiple segments: the Construction division earns EPC revenues, while the Concessions segment secures long-term returns via equity ownership and service contracts. This diversified model enhances revenue streams across development, delivery, and operational phases.

Regulatory and Operational Risks

The announcement includes a forward-looking statement outlining risks such as potential project delays or cancellations, inability to finalize the EPC agreement, and third-party performance risks. Additional challenges include permitting, approvals, labor availability, and supply chain issues that have affected infrastructure projects in North America recently.

Achieving the 2030 commercial operations goal depends on managing these risks and obtaining necessary regulatory authorizations. The statement cautions that anticipated revenues and project benefits may not fully materialize due to uncertainties in electricity demand, renewable development, grid expansion, and market conditions.

Impact on Aecon Shareholders and Ontario’s Grid Evolution

The Simcoe Battery Project underscores Aecon’s strategic role in Ontario’s electricity transition. As the province phases out coal and integrates renewables, battery storage is vital grid infrastructure. Aecon’s ongoing involvement in projects like Oneida and Simcoe positions it to benefit from sustained regulatory demand for storage capacity.

For investors, the project offers diversified revenue streams combining construction margins via the EPC contract and long-term operational income through the 20-year IESO agreement. Aecon’s approximately 1 GW Ontario battery storage portfolio suggests significant revenue and earnings contributions over the next decade. However, with commercial operations targeted in 2030, financial impacts will unfold over an extended period.