MHIET Sets Hydrogen Co-Firing Specifications for KU Series Gas Engines
MHIET Sets Hydrogen Co-Firing Specifications for KU Series Gas Engines
Mitsubishi Heavy Industries Engine & Turbocharger (MHIET) has established hydrogen co-firing specifications for its KU Series gas engines, rated 3.65-5.75 MW and used in cogeneration systems, and has begun proposal activities. The specifications allow operators to switch from natural gas to any hydrogen co-firing ratio during operation, with design changes minimized so new units can start on natural gas and later convert. Existing KU Series engines can be retrofitted with minimal modifications, and the KU Diesel Engine (KU30A) can be converted via gas engine conversion.
Hydrogen-capable gas engines let distributed power and cogeneration users hedge fuel supply and extend existing assets, which may shift demand toward hydrogen, e-methane and co-firing-ready equipment.
Key facts
| Companies | Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. (MHIET), Mitsubishi Heavy Industries (MHI) Group |
|---|---|
| Chemicals | hydrogen, natural gas, e-methane (synthetic methane), CO2 |
| Capacity | KU Series gas engine output 3.65-5.75 MW; hydrogen co-firing up to 50 vol% confirmed at rated output on a single-cylinder test engine for a 5.75 MW gas engine; GS6R2 engine 450 kW previously released with hydrogen co-firing specification |
| Location | Tokyo |
| Timing | 2026-08-27 |
| End uses | cogeneration systems, on-site power generation in institutions and factories, district heat supply, grid stability and power wheeling service, distributed power generation |
Market context
Gas engines of this size are used in cogeneration, where one fuel input produces both electricity and useful heat for buildings, factories and district heating networks. Demand for such units comes from on-site power in institutions and industrial plants, distributed generation, and grid support services that need fast-responding capacity. Natural gas remains the dominant fuel for these engines, so any change that lets them burn hydrogen or synthetic methane affects both gas consumption and the outlook for low-carbon fuels. Hydrogen blended into natural gas is typically limited by engine design, materials and combustion stability, which is why co-firing ratios and retrofit paths matter to operators. Equipment that can run on a range of blends gives buyers flexibility to adjust fuel sourcing as hydrogen and e-methane supply develops, and it can slow the replacement of existing assets. For suppliers of hydrogen, e-methane and gas engine equipment, such developments signal where future offtake and component demand may build.
Source: official release on mhi.com. Summary and context written by Market Krystal.
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