
Mine shafts— Gravity Hydrogen, Methane Aquifer— Thermal Purpose-drilled shafts— Coal mine— Methane, compressed air, and. . Depleted gas reservoirs Solution-mined salt caverns Non-potable aquifers Abandoned mines . Hydrogen (either as a gas, liquid, or within another mol-ecule like ammonia) may store a substantial amount of chemical energy. The subsequent. Storage media include water or ice-slush tanks, masses of native earth or bedrock accessed with heat exchangers by means of boreholes, deep aquifers contained between impermeable strata; shallow, lined pits filled with gravel and water and insulated at the top, as well as eutectic solutions and phase-change materials. [pdf]
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