ClearSign Technologies Reports Record Q4 and Full Year 2025 Results

Annual Revenue Up 44% to $5.2 Million, Backlog Grows with New Flexible Fuel Burner Orders

Apr. 9, 2026 at 8:05pm

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A highly polished, geometric metal object representing ClearSign's advanced combustion technology, set against a clean, monochromatic background and dramatically lit to convey the precision and innovation of the company's solutions.ClearSign's cutting-edge combustion technologies are helping industrial operators reduce emissions and support the transition to cleaner energy sources.Today in Tulsa

ClearSign Technologies Corporation, a leader in advanced combustion and sensing technologies, reported record quarterly revenue of $3.7 million and annual revenue of $5.2 million, up 44% from the prior year. The company received multiple orders for its ClearSign Core burner technology, including a 36-unit order from an integrated petroleum producer and a 32-unit order from a major refiner. ClearSign also successfully completed testing of its new ClearSign Core 2 flexible fuel burner, which can utilize fuel blends with up to 100% hydrogen.

Why it matters

ClearSign's record financial performance and growing order backlog demonstrate the increasing industry adoption of its innovative combustion and emissions reduction technologies. As companies across the energy, industrial, and commercial sectors seek solutions to reduce their environmental impact, ClearSign's flexible, hydrogen-capable burners position the company to capitalize on this market demand.

The details

ClearSign received two significant orders during the fourth quarter: the first was for 36 ClearSign Core burners from an integrated petroleum producer for a refinery retrofit, and the second was for 32 ClearSign Core burners from a major refiner for one of its California facilities. The company also successfully completed testing of its new ClearSign Core 2 burner, which can utilize fuel blends with up to 100% hydrogen, under the Department of Energy's Small Business Innovation Research program. Additionally, ClearSign received a fifth low-emission flare order from an energy company in California's San Joaquin Valley, as well as an order from a petrochemical client for comprehensive testing of the 100% hydrogen-capable burner.

  • ClearSign received the 36-unit order from the integrated petroleum producer in the fourth quarter of 2025.
  • ClearSign received the 32-unit order from the major refiner in the fourth quarter of 2025.
  • ClearSign successfully completed testing of the ClearSign Core 2 burner in the fourth quarter of 2025.
  • ClearSign received the fifth low-emission flare order from the California energy company in the fourth quarter of 2025.
  • ClearSign received the order for 100% hydrogen-capable burner testing from the petrochemical client in the fourth quarter of 2025.

The players

ClearSign Technologies Corporation

A leader in advanced combustion and sensing technologies that help industrial operators reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen.

Jim Deller, Ph.D.

Chief Executive Officer of ClearSign Technologies Corporation.

U.S. Department of Energy

The federal agency that, through its National Energy Technology Laboratory and Small Business Innovation Research program, collaborated with ClearSign on testing the ClearSign Core 2 flexible fuel burner.

Zeeco

A company that ClearSign has partnered with to co-brand and market the ClearSign Core process burner line.

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What they’re saying

“We're pleased to have closed the year on a high note, delivering record results for both the fourth quarter and the full year. We believe that this performance reflects ClearSign's growing recognition across the industry and increasing traction in our markets.”

— Jim Deller, Chief Executive Officer

“We expect this momentum to continue, supported by a strong and expanding proposal pipeline. Our highly adaptable, new flexible fuel ClearSign Core-2 process burner technology, which delivers ultra-low emissions while utilizing fuel blends, including up to 100% hydrogen, enables us to provide combustion solutions for a broader range of customer applications.”

— Jim Deller, Chief Executive Officer

What’s next

ClearSign expects the ongoing projects and new orders for its ClearSign Core and ClearSign Core 2 burners to continue strengthening the company's track record and expanding its base of references. The company's priorities are to grow its proposal pipeline and convert those opportunities into additional orders.

The takeaway

ClearSign's record financial performance and growing order backlog, driven by the successful development and testing of its flexible, hydrogen-capable ClearSign Core 2 burner technology, position the company to capitalize on increasing market demand for advanced combustion solutions that can help industrial operators reduce emissions and transition to cleaner fuels.