Interesting article on using renewably-generated hydrogen as a giant battery:
An $11 trillion global hydrogen energy boom is coming. Here's what could trigger it
Scheduled to be operational by 2025, the first phase of the ACES [Advanced Clean Energy Storage] project will provide 150,000 MWh of renewable power storage capacity, nearly 150 times the current U.S. installed lithium-ion battery storage base, according to [Mitsubishi Hitachi Power Systems].
...
“The formation has the potential to create up to 100 caverns, each one capable of holding 150,000 MWh of energy,” says Browning. “It would take 40,000 shipping containers of batteries to store that much energy in each cavern.”
But other elements of the timeline aren't as aggressive as that first part:
In the ACES project, some will power the adjacent Intermountain Power Project, a coal-fired plant operated by the Los Angeles Department of Water and Power that will be converted to hydrogen and natural gas, which produces almost half the carbon dioxide of coal, by 2025. It’s scheduled to be all green hydrogen by 2045.
Got to wonder, if they have a 150 GWh hydrogen supply on-site by 2025, why will it take 20 years to decide to use it? It's hard to know whether all this is really, you know, real. Or just nice-looking plans on paper.