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You can also use hydrogen (or Ammonia) for long term storage. It's one of the few use cases where hydrogen makes sense.

• kragen 3y ago
  for long-term storage it might be better to convert the hydrogen to something more easily storable, such as propane or octane, or to make a different electrolytic product such as aluminum
  • jasonwatkinspdx 3y ago
    Ammonia is another interesting storage fuel option.
    • kragen 3y ago
      yes, that's mentioned in the comment i was replying to, but while it's appealing in some ways, i feel that it is not as appealing as the options i mentioned for reasons of accident hazard, noxious combustion products, lower density, and risk of corrosion
      • pfdietz 3y ago
        There's also a possibility of using methanol, which is not as dangerous as ammonia. This would involve some complexity: 1) Have CO2 storage. 2) Make hydrogen by electrolysis. Store the oxygen. 3) The hydrogen is reacted with CO2 to make methanol, which is easily stored. 4) When power is needed, use the oxygen from 2) and the methanol from 3) in an Allam-cycle turbine. The CO2 of combustion is easily separated and put back into CO2 storage. One ends up needed long term storage of CO2, oxygen, and methanol, but this could be easier than storing hydrogen, especially if the CO2 and oxygen can be liquefied and there are no salt formations to make H2 storage easy.