e-STORAGE Achieves Commercial Operation of 220 MWh Mannum Battery Energy Storage Project in South Australia

KITCHENER, ON, Oct. 29, 2025 /PRNewswire/ -- Canadian Solar Inc. (the "Company" or "Canadian Solar") (NASDAQ: CSIQ) today announced that e-STORAGE, part of the Company's majority-owned subsidiary CSI Solar Co., Ltd. ("CSI Solar"), has successfully achieved commercial operation of the 220 MWh DC Mannum Battery Energy Storage Project in South Australia. e-STORAGE served as the Engineering, Procurement, and Construction (EPC) provider for the project, which is owned by Epic Energy and was developed by Recurrent Energy, a subsidiary of Canadian Solar.

e-STORAGE has further strengthened its track record in delivering large-scale storage solutions by commissioning the project in Australia. This success was driven by e-STORAGE's experienced local team and its partnership with Consolidated Power Projects (CPP) as the Balance of Plant contractor.

The project utilizes e-STORAGE's proprietary SolBank technology, ensuring safe, reliable, and high-performance operation. Under a long-term service agreement, e-STORAGE will also support the project's ongoing performance and operational management, demonstrating its commitment to long-term value creation.

Situated alongside 46 MWp of solar farm capacity also owned by Epic Energy at the Mannum site, the Mannum project marks a significant milestone in strengthening South Australia's grid stability and will make a significant contribution to South Australia's target of 100% renewable electricity generation by 2027.

Stephen Mudge, Interim Co-Chief Executive Officer of Epic Energy, said: "The commissioning of the Mannum grid-scale battery is an important milestone in our ongoing commitment to South Australia's energy security, and we thank all our internal and external partners for successfully delivering this complex project."

Colin Parkin, President of e-STORAGE, commented: "We are delighted to support Epic Energy in reinforcing South Australia's grid resilience and accelerating the shift towards clean energy. Today, with over 1.8 GWh of BESS under construction in Australia, e-STORAGE continues to establish itself as a leading product and solution provider in the region."

About Canadian Solar Inc.Canadian Solar is one of the world's largest solar technology and renewable energy companies. Founded in 2001 and headquartered in Kitchener, Ontario, the Company is a leading manufacturer of solar photovoltaic modules; provider of solar energy and battery energy storage solutions; and developer, owner, and operator of utility-scale solar power and battery energy storage projects. Over the past 24 years, Canadian Solar has successfully delivered nearly 165 GW of premium-quality, solar photovoltaic modules to customers across the world. Through its subsidiary e-STORAGE, Canadian Solar has shipped over 13 GWh of battery energy storage solutions to global markets as of June 30, 2025, boasting a $3 billion contracted backlog as of June 30, 2025. Since entering the project development business in 2010, Canadian Solar has developed, built, and connected approximately 12 GWp of solar power projects and 6 GWh of battery energy storage projects globally. Its geographically diversified project development pipeline includes 27 GWp of solar and 80 GWh of battery energy storage capacity in various stages of development. Canadian Solar is one of the most bankable companies in the solar and renewable energy industry, having been publicly listed on the NASDAQ since 2006. For additional information about the Company, follow Canadian Solar on LinkedIn or visit www.canadiansolar.com.

About e-STORAGEe-STORAGE is a subsidiary of Canadian Solar and a leading company specializing in designing, manufacturing, and integrating battery energy storage systems for utility-scale applications. e-STORAGE offers proprietary battery energy storage solutions, comprehensive EPC services, and innovative solutions aimed at improving grid operations. Currently, e-STORAGE operates fully automated, state-of-the-art manufacturing facilities with an annual battery energy storage system capacity of 10 GWh and battery cell capacity of 3 GWh. For more info, please refer to the Media&PR section of www.csestorage.com and follow our LinkedIn page.

Safe Harbor/Forward-Looking StatementsCertain statements in this press release are forward-looking statements that involve a number of risks and uncertainties that could cause actual results to differ materially. These statements are made under the "Safe Harbor" provisions of the U.S. Private Securities Litigation Reform Act of 1995. In some cases, you can identify forward-looking statements by such terms as "believes," "expects," "anticipates," "intends," "estimates," the negative of these terms, or other comparable terminology. Factors that could cause actual results to differ include general business, regulatory and economic conditions and the state of the solar power and battery energy storage market and industry; geopolitical tensions and conflicts, including impasses, sanctions and export controls; volatility, uncertainty, delays and disruptions related to global pandemics; supply chain disruptions; governmental support for the deployment of solar power and battery energy storage; future available supplies of silicon, solar wafers and lithium cells; demand for end-use products by consumers and inventory levels of such products in the supply chain; changes in demand from significant customers; changes in demand from major markets such as China, the U.S., Europe, Brazil and Japan; changes in effective tax rates; changes in customer order patterns; changes in product mix; changes in corporate responsibility, especially environmental, social and governance ("ESG") requirements; capacity utilization; level of competition; pricing pressure and declines in or failure to timely adjust average selling prices; delays in new product introduction; delays in utility-scale project approval process; delays in utility-scale project construction; delays in the completion of project sales; the pipeline of projects and timelines related to them; the ability of the parties to optimize value of that pipeline; continued success in technological innovations and delivery of products with the features that customers demand; shortage in supply of materials or capacity requirements; availability of financing; exchange and inflation rate fluctuations; litigation and other risks as described in the Company's filings with the Securities and Exchange Commission, including its annual report on Form 20-F filed on April 30, 2025. Although the Company believes that the expectations reflected in the forward-looking statements are reasonable, it cannot guarantee future results, level of activity, performance, or achievements. Investors should not place undue reliance on these forward-looking statements. All information provided in this press release is as of today's date, unless otherwise stated, and Canadian Solar undertakes no duty to update such information, except as required under applicable law.

CANADIAN SOLAR INC. INVESTOR RELATIONS CONTACTWina HuangInvestor Relations Canadian Solar Inc.investor@canadiansolar.com 

e-STORAGE MEDIA CONTACTmarketing@csisolar.com