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The USITC instituted a Section 337 investigation on March 30, 2026, based on a complaint filed by First Solar, Inc. (Phoenix, AZ) alleging patent infringement of U.S. Patent No. 9,130,074 by imported TOPCon solar cells, modules, panels, and components. The Commission will determine whether to issue a general or limited exclusion order and cease-and-desist orders against infringing imports. TOPCon (Tunnel Oxide Passivated Contact) solar technology is primarily manufactured in China, making this a significant action in the solar supply chain.