Canadian Solar announces the final resolution of the patent dispute with Maxeon Solar, after a U.S. federal court dismissed the lawsuit and the Federal Circuit vacated part of a PTAB ruling.
Canadian Solar Inc. announced the final resolution of the patent dispute that opposed it to Maxeon Solar Pte. Ltd. in the United States. Maxeon’s patent infringement lawsuit before a U.S. federal court has been dismissed with prejudice, a ruling that bars any new action on the same claims. The North American solar market remains marked by strong commercial activity, illustrated by the 48 MWac solar power purchase agreement recently signed by ENGIE and QTS in Texas and by the 857 million dollars raised by Dimension Energy for its distributed solar business. The U.S. Court of Appeals for the Federal Circuit also vacated the portion of the Patent Trial and Appeal Board (PTAB) decision, the administrative body responsible for reviewing the validity of U.S. patents, relating to Maxeon’s remaining claim.
The proceedings date back to March 2024, when Maxeon filed a patent infringement lawsuit covering three patents related to TOPCon solar cell technology. Maxeon alleged that Canadian Solar used these patents without authorization in the manufacturing of its photovoltaic modules. The case was pursued simultaneously before a federal court and before the PTAB, the body responsible for reviewing the validity of U.S. patents.
In January 2026, the PTAB issued Final Written Decisions in Canadian Solar’s favor, finding all of the patent claims Maxeon had asserted in the federal court litigation invalid. According to Canadian Solar, this ruling provides important legal clarity and reinforces its position of non-infringement. The Federal Circuit’s decision, which vacated the portion of the PTAB ruling relating to the last claim still in dispute, together with the federal court’s dismissal of the lawsuit, brings the proceedings to a definitive close.
Colin Parkin, Chief Executive Officer of Canadian Solar Inc., said the resolution confirms the company’s continued ability to compete through technology and manufacturing leadership. According to him, Canadian Solar has built a global manufacturing platform and a deep intellectual property portfolio by advancing high-performance solar and energy storage solutions for its global customer base. The executive added that the company intends to continue defending its intellectual property rights, supporting its customers and bringing new innovations to market.
Canadian Solar describes itself as one of the world’s largest renewable energy companies, with operations spanning the manufacturing of photovoltaic modules and energy storage systems. The company, listed on the Nasdaq under the symbol CSIQ, is headquartered in Kitchener, Ontario. The resolution of this dispute closes a legal proceeding that began more than two years ago between the two solar technology manufacturers.
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