Hyphen Hydrogen Energy has agreed a deal with the government of Namibia for the next phase of a $10 billion green hydrogen project that will export to Europe once complete, the two parties said on Wednesday.

Hyphen, whose shareholders include Germany-headquartered Enertrag, was announced as the preferred bidder in 2021 for the project in the Namib Desert’s Tsau //Khaeb National Park.

The feasibility and implementation agreement will be officially signed on Friday, officials said, as some community activists raised concerns over a perceived lack of transparency around the huge deal that costs as much as the country’s gross domestic product.