Undersea compressed air energy storage

[Daox]

An interesting idea. I'm not sure that its all that efficient. However, if it solves the problem of actually storing wind, tidal, or wave power for a reasonable amount of money, then it is a very important step forward.

Thin Red Line Aerospace - Capabilities

Energy bags would be anchored at a depth of approximately 600 meters (2000 feet) where the pressure of the ocean takes on the role of high performance pressure vessel. The bag is hereby relegated to a flexible, balloon like structure needing only to restrain the buoyant air bubble contained within—rather than a massive, thick-walled pressure tank of exceptional cost and complexity. At this depth the immense pressure of the ocean ensures high energy storage density, constant pressure regardless of bag volume, and pressure compatibility with existing high efficiency turbine technology.

[NeilBlanchard]

This is new - we gotta' keep thinking!