Green ammonia is ammonia produced using hydrogen made with renewable electricity, combined with nitrogen from air. Conventional ammonia commonly relies on fossil-based hydrogen, so changing how the hydrogen is supplied can significantly reduce associated emissions.
Ammonia is an established industrial chemical, especially in fertilizer production. It is also being studied as a fuel or as a way to ship energy and hydrogen across long distances. Turning ammonia back into hydrogen takes equipment and energy, so it is not a free transport step.
The environmental result depends on the electricity, hydrogen production, ammonia synthesis, transport and eventual use. Burning ammonia avoids carbon dioxide from the fuel molecule but may produce nitrogen oxides unless emissions are controlled. Ammonia is also toxic and requires established safety procedures.
For project claims, distinguish planned ammonia plant capacity from actual output and check whether the hydrogen feedstock is contractually and verifiably renewable. Evaluate the entire chain before calling it a low-emissions fuel.