Cutting-edge Gas Turbine Combustion Retrofits

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Innovative solutions for clean fuels and low emissions

Page last modified
December 11 2023

Thomassen Energy helps gas turbine power plants achieve their business and profitability objectives while reducing their carbon footprint to meet decarbonization goals. 

We specialize in retrofitting currently installed gas turbines with our cutting-edge technologies that enable them to burn versatile fuels, including hydrogen and refinery off-gas (ROG). When clean H2 is blended with natural gas, the gas turbine CO2 emissions cab be significantly reduced. When the fuel source is 100% H2, no CO2 will be generated by the gas turbine. 

Thomassen Energy's FlameSheet™ combustion system is flexible, it features a unique flame stabilization mechanism that enhances combustion stability and enables greater fuel flexibility. This allows for efficient combustion clean/cleaner fuels (eg H2, ROG) without compromising combustion stability or emissions performance and help to reduce carbon emissions and mitigate the effects of climate change. 

The commercially proven FlameSheet™ combustor platform is operating in ca. 20 installations, at today, worldwide. It is available for the worldwide installed fleets of B-, E- and F-Class gas turbines. The FlameSheet™ combustor delivers unsurpassed fuel flexibility, operational flexibility, and emissions performance with optimized life cycle maintenance costs.

As an example of these installations, in July 2023, Thomassen Energy, PSM and Hanwha celebrated a world-first achievement by co-firing liquefied natural gas (LNG) and hydrogen, with a record rate of 60% hydrogen (by volume) and with single digit NOx emissions, in a 80MW heavy-duty frame gas turbine retrofitted with the FlameSheet™ combustor.

Thomassen Energy is leading a consortium to demonstrate the use of the FlameSheet™ technology for flexible operation from 0-100% hydrogen, with sub 9ppm NOx, without the use of diluents. The consortium includes such partners as powerplant operators, research institutes and universities.


NOx as low as 5 ppm
No Carbon emission when 100% H2 is used
Ideally suited for alternate fuel operations, including Hydrogen and Refinery off-gas
Up to 30% increase in Gas Turbine operating load range with single digit NOx and CO
Superior Fuel Flexibility


Decarbonize existing gas turbines Cost-effective cutting-edge retrofits for existing gas turbine fleet
Grid balancing Complement and balance intermittent renewable energy sources by providing reliable and dispatchable power with low emissions
Enhanced fuel flexibility Ideally suited for natural gas and alternate fuels as hydrogen, with a 30% Modified Wobbe Index operational range
Retrofit available for GE Fr5, 6B, 6F, 7E, 7F, 9E, 9F; Siemens/Mitsubishi 501F, 501G, 701F, 701G; Siemens 501B/D and Opra OP16
Superior Fuel Flexibility 30% Modified Wobbe Index

Relative Business Impact


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Technology Readiness Level


Development Technology demonstration Mature / Proven
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Thomassen Energy B.V. is a leading manufacturer and supplier of technologically advanced aftermarket gas turbine components, performance upgrades, in-house component repair and outage services for multiple existing General Electric (GE), Siemens/Mitsubishi and Westinghouse gas turbines. We offer flexible and comprehensive Service Agreements, ranging from parts supply and reconditioning to full scope agreements including remote monitoring and diagnostics and inventory management. Thomassen Energy is a proven alternative with parts and upgrades successfully operating for more than 10 million operating hours in over 10 GW of installed gas turbines.

With more than 50 years of experience working on all aspects of heavy-duty gas turbine technology, Thomassen Energy provides flexible, reliable and efficient service solutions that optimise asset availability, minimise maintenance and lifecyle costs, and increase operating safety while meeting the need for clean, efficient and reliable power in an environmentally responsible manner.

Since 2021, we are owned by Hanwha Impact Corporation, part of the global Hanwha Group headquartered in South Korea. Hanwha is the 7th largest company in Korea and is a Fortune Global 500 company. It intends to play a major role in the transition to the low carbon economy. Jointly with our American-based sister company Power Systems Manufacturing (PSM) we form the core of Hanwha’s gas turbine service group, with the ambition to provide clean energy solutions for future generations.

From our headquarters in the Netherlands and through local execution centres based in the US, Asia and the Middle East, Thomassen Energy serves customers around the world.

We are a leading manufacturer and supplier of innovative clean energy solutions for future generations. Our mission is to fulfil our client needs with a flexible, reliable and efficient portfolio to improve asset life cycle costs. Safety, Quality and Respect for people are embedded in our DNA.

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