This of course also enables storage for delivery of power at night. I think there is some physical-chemical development work left to do for maximally efficient

This of course also enables storage for delivery of power at night. I think there is some physical-chemical development work left to do for maximally efficient commodity-grade solid-state fuel cells that work with ammonia and air, but it is eminently doable today. In the meantime, you can burn ammonia in combined-cycle turbines where NG is burned now.