Source? I'm not finding any result for electric ammonia synthesis plants under construction right now.
The best I could find is this [1] but it's not a plant under construction, and there still significant challenges to overcome to make this viable.
> You imagine that engineers are idiots who cannot direct existing, familiar processes, unchanged, to new purposes. But engineers are not idiots. Neither are we.
Those engineers have opted not to build any of the storage systems you listed. I agree they're not idiots.
1. https://www.chemistryworld.com/features/ammonia-synthesis-go...
Insisting that a synthesis plant must jealously direct every last liter produced to be tanked and later burned in a local peaker turbine is fetishism. The ammonia doesn't care, and neither does the synthesis equipment owner: any customer who pays is a good one.
Yes, for purposes different from energy storage. The massive amounts of ammonia synthesized through the Haber process for fertilizer production does nothing to demonstrate ammonia's viability for electric grid storage.
Likewise the hydrogen used in space rockets has no bearing on the feasibility of electrolyzing water, storing the hydrogen, and converting it back to electricity. If anything, the fact that most hydrogen is produced through steam reformation highlights the difficulties of electrolysis at scale.
We have plenty of experience with flywheels. Almost every car has a flywheel in it. Does that mean it's guaranteed to be extremely cheap and scalable to store electricity by spinning a bunch of giant flywheels? That's the kind of leap you're making here.
When someone actually builds and operates a facility that takes in electricity, produces ammonia, and then taps that stored ammonia to produce electricity later, then we can actually measure real-world cost of such a storage system. Until then, it's just optimistic predictions. And optimistic predictions don't actually store any energy.