ClearSign Technologies Reports Strong Q4 2025 Revenue, Highlights Burner Project Pipeline

Industrial tech firm sees 525% year-over-year revenue jump, driven by major refinery and petrochemical orders.

Apr. 13, 2026 at 2:36pm

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A close-up photograph of a sleek, black metal industrial burner component floating on a clean white background, symbolizing the advanced engineering behind ClearSign's emissions-reducing technology.ClearSign's advanced burner technology aims to reduce emissions at the source, providing a cost-effective alternative to downstream filtration systems.Santa Rosa Today

ClearSign Technologies (NASDAQ:CLIR) reported a sharp increase in fourth quarter 2025 revenue, driven by a $2.6 million process burner order for a Texas Gulf Coast petrochemical plant. The company also discussed progress on multiple large refinery and petrochemical burner projects, emphasizing growing customer engagement, expanded product configurations, and upcoming demonstrations intended to support additional order wins.

Why it matters

ClearSign's low-emissions industrial burners provide a cost-effective alternative to traditional selective catalytic reduction (SCR) systems, helping customers meet stringent environmental regulations. The company's ability to secure major orders from prominent refining and petrochemical customers demonstrates the growing demand for its technology and positions it for potential future growth in the sizable industrial burner market.

The details

ClearSign recognized approximately $3.7 million in revenue in Q4 2025, up from $590,000 in the same period of 2024. The increase was primarily due to the $2.6 million process burner order. For the full year 2025, ClearSign reported gross profit of 27%, down from 31% in 2024, driven by a warranty accrual. Net loss increased by $197,000, largely due to $746,000 in non-recurring legal fees.

  • The 26-burner order that drove Q4 revenue has been completed and delivered, with installation expected in early Q3 2026 and startup currently scheduled for October 2026.
  • ClearSign has also received a 36-burner order for a 'household name' major customer on the Gulf Coast, with engineering work progressing well and the first manufacturing phase pulled forward.
  • Additionally, ClearSign has a 32-burner order for another major refiner, with engineering and computational fluid dynamics (CFD) work going well and the project split into two parts with an accelerated first portion.

The players

ClearSign Technologies Corporation

A clean energy technology company specializing in advanced combustion solutions that significantly reduce emissions of nitrogen oxides (NOx), carbon monoxide (CO), and greenhouse gases from industrial and power generation sources.

Brent Hinds

Chief Financial Officer of ClearSign Technologies.

Jim Deller

Chief Executive Officer of ClearSign Technologies.

Zeeco

A multi-billion-dollar company with extensive testing and manufacturing infrastructure that manufactures and supports testing for ClearSign's process burner products.

Calco

A heater engineering and revamp firm involved in the 26-burner project on the Texas Gulf Coast.

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What they’re saying

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— Robert Jenkins, San Francisco resident

“Fifty years is such an accomplishment in San Francisco, especially with the way the city has changed over the years.”

— Gordon Edgar, grocery employee

What’s next

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The takeaway

This case highlights growing concerns in the community about repeat offenders released on bail, raising questions about bail reform, public safety on SF streets, and if any special laws to govern autonomous vehicles in residential and commercial areas.