To search for ideas of what would be a good candidate for soaking up excess electricity, look at capital cost per watt consumed: For instance, if I have an eff

To search for ideas of what would be a good candidate for soaking up excess electricity, look at capital cost per watt consumed: For instance, if I have an efficient computer system that costs $100 for every watt consumed, it's not going to make sense to run it only during that 20% of the time there's excess electricity. The effective capital cost is then 5 times greater. I'd be better off investing in a battery and extra solar to allow it to run it 24/7. But if, instead, I have something which has incredibly low capital costs, like 10 cents per Watt consumed, and which can tolerate being shutdown and restarted, then even though it might only be operating 20% of the time, the effective capital cost is still just 50 cents per Watt, even cheaper than a battery capital cost. So it makes economic sense to use that to soak up the extra electricity demand. This is why the key for hydrogen electrolysis isn't so much efficiency but capital costs: a variable-renewables-heavy grid will have enormous amounts of excess electricity at times, but only for fairly brief periods. You can't economically "store" that electricity using hydrogen if your electrolysis capital costs are so high you need to run your electrolysis cell 24/7! If you want to make the hydrogen economy a reality, FORGET about hydrogen cars. Focus on hydrogen electrolysis capital costs!!!