Sister project: Flex4H2

Flexibility for Hydrogen (FLEX4H2) is a co-funded project by Clean Hydrogen Partnership, EU, and Switzerland. It aims to develop a fuel-flexible combustion system capable of operation with any hydrogen concentration in natural gas, up to 100% H2.


The design of the combustor is based on the proprietary combustion technology, Constant Pressure Sequential Combustion (CPSC), developed for Ansaldo’s GT36 H-Class turbine. The technology will be demonstrated in a stepwise approach, at full gas turbine operation conditions. It will be entirely compliant with NOx emissions targets without the use of diluents and with minimal impact on thermal efficiency.


The new combustor design will be fully retrofittable to existing gas turbines, thereby providing significant opportunities for refurbishing existing assets.