The pair have signed a non-binding memorandum of understanding to assess, using HiiRoc’s plasma-based technology to decarbonise Tokyo Gas customers’ operations and explore potential uses for solid carbon.

HiiRoc’s thermal plasma electrolysis (TPE) technology operates similarly to methane pyrolysis. However, the company uses electrical plasma torches, rather than heat, to split hydrocarbons into high-pressure hydrogen and solid carbon.

It claims the system can produce hydrogen as cheaply as steam methane reforming without the need for carbon capture, while requiring less energy than electrolysis.

Under the partnership, the duo said they will “collaborate” on HiiRoc’s TPE technology in Japan, with the option to expand to other regions in the future.

HiiRoc CEO, Tim Davies, said the partnership could drive “significant advancements” in energy and industrial decarbonisation as well as carbon black.

Methane pyrolysis is slated as a lower-cost clean hydrogen pathway due to its solid carbon output, which can be monetised for use in various sectors.

Tokyo Gas has been exploring the use of hydrogen, renewable and natural gas, and e-methane to decarbonise its grid operations. In 2024, the operator brought online a megawatt-class PEM electrolyser at a facility to trial the technology.

If the partnership is successful, it could lead to some of HiiRoc’s first overseas deployments. To date, the firm has been conducting trials with UK industrial and energy companies.