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Also interesting is hydraulic energy storage. Any entrepreneurs want to take a shot with this system?

http://license.umn.edu/technologies/z07054_hydraulic-energy-...

>Hydraulic energy storage systems store energy by compressing air similar to a battery storing energy in an electric circuit.

Wait, did you read the article? :)

Hydraulic systems and compressed air systems are usually regarded as separate things. Maybe the distinction is a bit arbitrary and the former can be regarded as a subset of the latter but there you go. edit: Google says hydraulic transmits power through fluid, compressed air through air/gas.

Pneumatic vs hydraulic is about compressible vs incompressible fluids. (Naturally, hydraulic oil is also a much better lubricator and an exceedingly superior sealant than oiled air).

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