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Also you could do it underwater if you live near a coast. Basically an upside down cup with a pipe in it, sunk as deep as possible.


The same company has actually done this[1] with the city of Toronto.

[1] https://www.youtube.com/watch?v=GicQwXbNnv0


The video is from 2015, and says it was a 2 year pilot project. Do you know if there are there any updates on how the project went? Is it still operational? Did they build any more?


Not sure, this is the page on the companies website: https://www.hydrostor.ca/toronto-a-caes-facility/




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