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[–] sheepsexplode 0 points 3 points (+3|-0) ago  (edited ago)

THIS Compressed air stored in bags under water. Toronto hydro is testing. Video

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[–] tame ago 

The problem with compressing air is that you lose a lot of energy as heat, so it's really inefficient for long term storage. Great for very short term though, there was a regen braking system for trucks that used compressed air stored in insulated tanks.

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[–] Maxcactus [S] ago  (edited ago)

That looks like it would work and would be easily expandable once it was perfected. Mostly off the shelf technology. Air bladders a and pressurized pipes were figured out a long time ago. I wonder why they included the underground approach? They could have just run a pipe along the surface and extended it out into the water depth required.

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[–] sheepsexplode 0 points 1 point (+1|-0) ago 

I think it is to prevent damage to the line but I am not sure either.