ClearSign Receives Fourth Low-Emission Flare Burner Order from Leading Energy Producer in California

TULSA, OK / ACCESS Newswire / October 23, 2025 / ClearSign Technologies Corporation (NASDAQ:CLIR) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen, today announces it received an engineering order for a fourth low-emission retrofit flare burner from a major energy producer for deployment in California.

"We're pleased to expand our partnership with this key customer as they continue to modernize their operations for stricter environmental standards," said Jim Deller, Ph.D., Chief Executive Officer of ClearSign. "This marks the third burner order this year and the fourth overall from this operator - a strong validation of our technology's performance and reliability in the field. With increasing regulatory pressure and growing demand for proven retrofit solutions, we believe additional opportunities with this customer may follow."

The order covers engineering and design work for the retrofit of an enclosed flare at a production facility in California's San Joaquin Valley, scheduled for installation in the second quarter of 2026. The scope includes upgraded flare structure components and control systems, expanding ClearSign's engagement beyond burner technology into broader emissions and system integration solutions.

"This repeat business demonstrates how ClearSign is not only winning new customers but deepening relationships with existing ones," Deller added. "Each successful deployment enhances our reputation as a trusted provider of next-generation, ultra-low-NOx combustion technologies."

About ClearSign Technologies Corporation

ClearSign Technologies Corporation designs and develops products and technologies for the purpose of decarbonization and improving key performance characteristics of industrial and commercial systems, including operational performance, energy efficiency, emission reduction, safety, the use of hydrogen as a fuel and overall cost-effectiveness. Our patented technologies, embedded in established OEM products as ClearSign Core™ and ClearSign Eye™ and other sensing configurations, enhance the performance of combustion systems and fuel safety systems in a broad range of markets, including the energy (upstream oil production and down-stream refining), commercial/industrial boiler, chemical, petrochemical, transport and power industries. For more information, please visit www.clearsign.com.

For further information:

Investor Relations:
Matthew Selinger
Firm IR Group for ClearSign
+1 415-572-8152
[email protected]

Cautionary note on forward-looking statements

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SOURCE: ClearSign Technologies