Northland Power Announces Commercial Operations at Oneida Energy Storage Project – Canada’s Largest Battery Storage Facility Delivered Ahead of Schedule and Below Budget

Press Release

TORONTO, May 07, 2025 Northland Power Inc. (“Northland” or the “Company”) (TSX: NPI) is pleased to announce that the Oneida Energy Storage Project (“Oneida”) has successfully commenced commercial operations. The project was completed ahead of schedule and under budget and is the largest battery energy storage facility in operation in Canada.

“Today marks a major milestone for Northland and the Oneida project,” said Christine Healy, President & Chief Executive Officer of Northland. “Oneida represents a pivotal step in our strategy to develop and operate battery storage facilities. A first-of-its-kind in Canada, this facility supports grid stability and reliability in Ontario. Delivering this project ahead of schedule and under budget is a clear demonstration of Northland’s capability to execute large-scale energy projects safely and effectively.”

Located in Haldimand County, Ontario, Oneida is a 250 MW / 1,000 MWh battery storage facility. It is Northland’s first operational energy storage project in Canada. The project positions the Company as a market leader in a key growth segment, offering immediate scale and presence. Northland owns approximately 70% of Oneida, with the remaining ownership held by Six Nations of the Grand River Development Corporation, NRStor Inc., Aecon Concessions and Mississaugas of the Credit Business Corporation. The project was completed with a final cost of approximately $700 million, compared to the initial $800 million estimate at financial close in 2023. Oneida is backed by a 20-year capacity contract with Ontario’s Independent Electricity System Operator, providing stable, long-term revenue.

“We’re incredibly proud of what our joint teams have accomplished,” said Michelle Chislett, Executive Vice President of Northland’s Onshore Renewables business. “This milestone reflects the strong collaboration among our project partners, including our First Nations partners, suppliers, and financiers, including the Canadian Infrastructure Bank.”

With the completion of Oneida, Northland remains focused on the successful and safe delivery of its construction projects, including the 1.1 GW Baltic Power offshore wind project in Poland and the 1.0 GW Hai Long offshore wind project in Taiwan.

ABOUT NORTHLAND POWER

Northland Power is a Canada-based global power producer dedicated to accelerating the global energy transition. Founded in 1987, with almost four decades of experience, Northland has a long history of developing, owning and operating a diversified mix of energy infrastructure assets including offshore and onshore wind, solar, battery energy storage, and natural gas. Northland also supplies energy through a regulated utility.

Headquartered in Toronto, Canada, with global offices in seven countries, Northland owns or has an economic interest in 3.5 GW of gross operating generating capacity, 2.2 GW under construction and a significant inventory of early to mid-stage development opportunities encompassing approximately 10 GW of potential capacity.

Publicly traded since 1997, Northland’s Common Shares, Series 1 and Series 2 Preferred Shares trade on the Toronto Stock Exchange under the symbols NPI, NPI.PR.A and NPI.PR.B, respectively.

For further information, please contact:

Dario Neimarlija, Vice President, FP&A & Investor Relations
647-288-1019
investorrelations@northlandpower.com

Victor Gravili, Head of Global Brand & Integrated Communications
647-288-1105
communications@northlandpower.com

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