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if you want more about green power storage then please read below...
green power storage is environmental friendly..which uses sustainable method to store energy like in springs or in flywheel...etc ,green power storage is required for use with renewable energy,like energy carriers as hydrogen, liquid nitrogen, compressed air, oxyhydrogen, batteries, to power vehicles.flywheel energy storage, pumped-storage hydroelectricity is more usable in stationary applications to power homes and offices. In household power systems, conversion of energy can also be done to reduce smell. For example organic matter such as cow dung and spoilable organic matter can be converted to biochar. To eliminate emissions, carbon capture and storage is then used.Renewable energy power plants do provide a steady flow of energy. For example hydropower plants, ocean thermal plants, osmotic power plants all provide power at a regulated pace


please read
http://en.wikipediawiki/Grid_energy_storage
http://en.wikipediawiki/Sustainable_energy

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