USITC Institutes Section 337 Investigation of Certain Topcon Solar Cells, Modules, Panels, Components Thereof, and Products Containing Same

The U.S. International Trade Commission (USITC) voted to institute an investigation of certain TOPCon solar cells, modules, panels, components thereof, and products containing same. The products at issue in the investigation are described in the Commission's notice of institution of investigation.

The investigation is based on a complaint filed on behalf of First Solar, Inc. of Phoenix, Arizona on February 24 2026. The Complaint was supplemented on March 10, 2026. The complaint, as supplemented, alleges violations of section 337 of the Tariff Act of 1930 in the importation into the United States of certain TOPCon solar cells, modules, panels, components thereof, and products containing same infringe certain claims of the patent asserted by the complainant. The complainant requests that the USITC issue a general exclusion order, or in the alternative a limited exclusion order, and cease and desist orders.

The USITC has identified the following respondents in this investigation:

• AXITEC, LLC, Radnor, Pennsylvania
• AXITEC Energy GmbH & Co. KG, Böblingen, Germany
• Axitec Solar, LLC, Newark, Delaware,
• Canadian Solar Inc., Ontario, Canada
• CSI Solar Co., Ltd., Suzhou, Jiangsu Province, China
• Canadian Solar (USA) Inc., Walnut Creek, California
• Canadian Solar Manufacturing (Thailand) Co., Ltd., Chon Buri, Thailand
• Canadian Solar US Module Manufacturing Corporation, Mesquite, Texas
• Canadian Solar International Ltd., Kowloon, Hong Kong
• JA Solar Technology Co., Ltd, Beijing, China
• JA Solar USA, Inc., San Jose, California
• JA Solar AZ, LLC, Phoenix, Arizonia
• JA Solar International, Ltd., Kowloon, Hong Kong
• JA Solar Vietnam Co., Ltd., Township, Bac Giang, Vietnam
• JinkoSolar Holding Co., Ltd., Jiangxi Province, China
• Jinko Solar Co., Ltd., Jiangxi Province, China
• Jinko Solar (Vietnam) Industries Co. Ltd., Quang Ninh, Vietnam
• Jinko Solar Technology Sdn. Bhd., Pulau Pinang, Malaysia
• Zhejiang Jinko Solar Co., Ltd., Zhejiang Province, China
• JinkoSolar (U.S.) Inc., Campbell, California
• JinkoSolar (U.S.) Manufacturing Inc., Dover, Delaware
• JinkoSolar (U.S.) Industries Inc., Jacksonville, Florida
• Mundra Solar PV Limited, Gujarat, India
• Mundra Solar Energy Ltd., Gujarat, India
• Adani Green Energy Ltd., Gujarat, India
• Philadelphia Solar LLC, Amman, Jordan
• Philadelphia Solar USA Inc., San Mateo, California
• Hanwha Q CELLS USA Inc., Dalton, Georgia
• Hanwha Q CELLS America Inc., Irvine, California
• Hanwha Q CELLS USA Corp., Irvine, California
• Hanwha Solutions Corporation, Seoul, Korea
• Jiangsu Runergy New Energy Technology Co., Ltd., Yancheng City, Jiangsu Province, China
• Runergy USA Inc., Pleasanton, California
• Runergy Alabama Inc., Huntsville, Alabama
• Runergy USA Trading LLC, Dover, Delaware
• Runergy PV Technology (Thailand) Co., Ltd., Pluak Daeng, Rayong, Thailand
• Trina Solar Co., Ltd., Xinbei District, Jiangsu Province, China
• Trina Solar (U.S.), Inc., Fremont, California
• Trina Solar Energy Development Co., Ltd., Nguyen Province, Vietnam
• Changzhou Trina Solar Energy Co., Ltd., Suxi Town, Yiwu, Zhejiang China
• Trina Solar Yiwu Technology Co., Ltd., Suxi Town, Yiwu, Zhejiang China
• T1 Energy, Inc., Austin, Texas
• T1 G1 Dallas Solar Module LLC, Wilmer, Texas
• Vietnam Sunergy Joint Stock Company, Viet Yen Town Bac Giang Province, Vietnam
• VSUN Solar USA Inc., Fremont, California
• Toyo Co., Ltd, Tokyo, Japan
• Toyo Solar Texas, LLC, Humble, Texas

By instituting this investigation (337-TA-1494), the USITC has not yet made any decision on the merits of the case. The USITC's Chief Administrative Law Judge will assign the case to one of the USITC's administrative law judges (ALJ), who will schedule and hold an evidentiary hearing. The ALJ will make an initial determination as to whether there is a violation of section 337; that initial determination is subject to review by the Commission.

The USITC will make a final determination in the investigation at the earliest practicable time. Within 45 days after institution of the investigation, the USITC will set a target date for completing the investigation. USITC remedial orders in section 337 cases are effective when issued and become final 60 days after issuance unless disapproved for policy reasons by the U.S. Trade Representative within that 60-day period.