Norsk Hydro ASA has made the world’s first batch of aluminum using green hydrogen in a step toward decarbonizing the production of the metal.

The Norwegian producer replaced natural gas with green hydrogen during a test at its extrusion plant in Navarra, Spain, it said in a statement on Thursday. Hydro’s renewable hydrogen company, Hydro Havrand, conducted the trial in partnership with Fives North America Combustion, an engineering firm with expertise in hydrogen burner technology.

For more than a century, Hydro has been searching for new uses for the vast amounts of hydroelectric power that Norway generates each year. The company first found success making artificial fertilizers via a pioneering electrochemical process, and later focused its attention on aluminum, which is one of the world’s most energy-intensive industrial commodities to make. Now, it’s betting that hydrogen could prove even more lucrative.