TotalEnergies announced a call for tenders for the annual production of 500,000 tonnes of “green” hydrogen on Thursday, as part of the French oil major’s plans to decarbonise its European refineries.

Its emissions reduction plan is to use green hydrogen, which is produced using renewable energy, to completely replace “grey” hydrogen in its carbon intensive industrial activities.

TotalEnergies said the transition to green hydrogen would reduce emissions by around five million metric tons of CO2 per year from its refineries in Europe, including its three oil refineries and two biorefineries in France.

The call for tenders will complement other smaller, local projects, it added.