Energy is extremely hard to store, currently there are not may options for power storage, you can either store potential energy is the form of a dam or electrical energy in batteries. However these are not very feasible methods as dams require certain geography and years of planning and building, while current batteries are unable to store anywhere near the amount of energy needed for commercial use.
A Canadian group have been working on a solution to this problem and it's well worth having a read about it if you have a spare few minutes. This is something you could be seeing put into practice in the very near future.
Check out the link
http://www.sciencealert.com/underwater-balloons-could-give-us-a-new-way-of-storing-renewable-energy
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