Green hydrogen is produced by splitting water (H₂O) into hydrogen and oxygen using electricity from renewable sources through a process called electrolysis. When solar, wind, or hydroelectric power drives an electrolyzer, water molecules break apart at the cathode and anode, creating pure hydrogen with zero carbon emissions—unlike gray or blue hydrogen derived from fossil fuels.

What Happens During the Electrolysis Process?

An electrolyzer contains two electrodes submerged in water with an electrolyte solution. When renewable electricity flows through, water molecules split: oxygen forms at the anode (positive electrode) and hydrogen collects at the cathode (negative electrode). Modern PEM (Proton Exchange Membrane) electrolyzers operate at 60-70% efficiency, while alkaline electrolyzers reach 50-60%. The hydrogen is then compressed and stored for various applications.

Which Renewable Energy Sources Power Green Hydrogen Production?

Solar and wind dominate green hydrogen production in 2026, with offshore wind projects in Europe and massive solar farms in Australia and the Middle East leading capacity. According to the International Energy Agency, production costs have dropped to $3-4 per kilogram in optimal locations—down from $6-8 in 2020. Hydroelectric power also contributes significantly in regions like Norway and Canada, providing stable baseload electricity for continuous hydrogen generation.

Where Is Green Hydrogen Being Used Today?

Heavy industry applications lead adoption: steel manufacturers are replacing coal-based reduction with hydrogen, while ammonia producers use it for fertilizers. Transportation sectors including shipping, aviation, and long-haul trucking are piloting hydrogen fuel cells. Germany’s hydrogen pipeline network now spans 1,800 kilometers, serving industrial clusters directly from renewable-powered electrolysis facilities.