An energy transport and storage system in combination with a method of water treatment, which includes: a fresh water or effluent water interconnection, an electricity interconnection with an electric grid, a water filtration and de-mineralization system, a fresh or effluent water electrolyser, a heat recovery system connected to the electrolyser, an electrolyte recovery system connected to the electrolyser, an interconnection to an alternative hydrogen gas supply, a high pressure underground hydrogen gas storage system, a safety valve connected to the underground hydrogen gas storage system, an electric generation system powered by compressed hydrogen gas turning a turbine during decompression which can recycle electricity within the system or send electricity to an electric grid, a hydrogen gas outlet for distribution of hydrogen, an oxygen gas transport system which sends oxygen gas to a water treatment facility to be used for water disinfection.
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