A couple of points:
(1) On.Energy storage, batteries may be preferred for storage of small amount of energy… However for grid scale where large amount of energy to be stored, the emerging trend is to go for hydro pumping storage due to low cost , 50-100 years life cycle and no import content in construction where as lithium ion batteries are expensive with import content would be bulky for mega energy storage, batteries would require frequent maintenance and low life cycle of batteries.
(2) On electrolyser,/ fuel cell, a lot of developments taking place very fast and RO water may not be required.
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