Mantasia, a joint venture between German renewable energy firms Yamko Energy and Ilos Energy, claims the project is among the first to successfully navigate Greece’s complex hydrogen regulations.

Greenlit by the environmental impact association and certified for production by the Greek government, the Mantasia project aims to supply low-carbon hydrogen for heavy industry and transport.

While details of the project remain thin, it now proceeds to early financial and technical development.

In July 2025, the Greek government passed its first dedicated hydrogen law, establishing a framework for licensing, certifying, and supporting production.

It introduced a hydrogen producer certificate (HPC), which means a project must have environmental licensing within six months, a grid connection agreement (within 36 months, if injecting hydrogen), a monitoring agreement for non-injecting units, and installation approval, trial operation, and then operation approval within 24–36 months total.

Greece’s clean hydrogen sector remains extremely nascent. The only other large-scale example is a 50MW project at Motor Oil’s refinery, which received €111.7m ($117m) in EU funding.

Despite the country’s strong renewable energy potential, it has been widely left out of EU-wide funding schemes.

Speaking at European Hydrogen Week 2025, Dimtiros Triantafyllopoulous, CEO of Greek firm Hellenic Hydrogen, said the European Commission should look at how it could support projects beyond key regions like the Iberian Peninsula and the Nordics.