Efficiency matters little given a natural surplus, as will be the case when most of power comes from massively over-provisioned solar, similarly as is seen with

Efficiency matters little given a natural surplus, as will be the case when most of power comes from massively over-provisioned solar, similarly as is seen with hydro power in certain very wet places. Utility-scale users of solar will naturally install electrolysers for the additional revenue stream, using generation in excess of immediate need after local storage is charged up. They will favor the cheapest equipment, disregarding efficiency, because of their intermittent utilization. Nobody will be able to compete with them, because the power they use will be wholly free (i.e. "zero marginal cost"). The market for electrolysed H2, and NH3 produced from it, will be unlimited. Solar farms not producing H2 will find themselves undercut by those that are. Long-term energy storage will not be a thing, because any need beyond a few days will be satisfied by shipments of LNH3 from tropical producers. It will take time for all this to settle out. Expect to see a lot of short-term adaptations.