How does renewable hydrogen production efficiency vary with scale? That is, are there reasons why renewable hydrogen may not make sense to produce at very small scale, or conversely, why it may not be economic at very large scale?

The efficiency of hydrogen production is largely unaffected by scale. Electrolyzer efficiencies are normally quoted at their rated input level, but the efficiency at power levels below the rated level can actually be higher. Commercial electrolyzers are quoted in a...