Underwater storage of electricity with 70% efficiency

[Eric DUPONT]

what would the overall return be?

[ENERC]

what would the overall return be?

Electrolyser: 70%
The energy yield of NH3 synthesis is around 70%
Liquefaction is negligible
Turbine efficiency: I would say 45-50%

We should reach 25%.

On the other hand, the PCI is 18 kJ / kg. In a 646 m3 tank, we store 000 GWh with the above data (3 * 5 * 3 [liter] * 1000 [kJ] / 1000/18600/3600 * 1000 [µ] * 1000 [liquid ammonia density])
I edited by putting the efficiency of the turbine, and not the overall efficiency

[Eric DUPONT]

I think it's pointless to have such an energy density. especially to lose a significant yield in the conversion of ammonia, it remains all the same that it is difficult to exceed 50% yield with hydrogen.