[api]

It's a way of storing energy. You use solar, nuclear, wind, etc. to make ammonia.

[jnmandal]

I get that but isn't it like 100x more efficient to be storing that energy to offset intermittency/base power or selling that ammonium as fertilizer to offset hydrocarbon-based haber bosch ferts?

[api]

There are more efficient ways, but batteries are heavy and still not as compact as liquid fuels. If you want to run ships on non-carbon-based energy making a liquid fuel is one way that can work today.