It’s curious to see this topic on HN as I just came across an article about the impeding energy crisis in Ontario that sheds light on how the province is leveraging underground compressed air storage[1] as a tactic in their energy storage mitigation strategy.
[1] “Beyond the sprawling nuclear plants and waterfalls that generate most of the province’s electricity sit the batteries, the underground caverns storing compressed air to generate electricity, and the spinning flywheels waiting to store energy at times of low demand and inject it back into the system when needed.”
https://toronto.citynews.ca/2022/12/26/ontario-electricity-e...
[1] “Beyond the sprawling nuclear plants and waterfalls that generate most of the province’s electricity sit the batteries, the underground caverns storing compressed air to generate electricity, and the spinning flywheels waiting to store energy at times of low demand and inject it back into the system when needed.” https://toronto.citynews.ca/2022/12/26/ontario-electricity-e...