Whether or not it's a good idea, the numbers you're quoting aren't really an argument for it. A low efficiency solution with high storage capacity absolutely h

Whether or not it's a good idea, the numbers you're quoting aren't really an argument for it. A low efficiency solution with high storage capacity absolutely has a role in the transition to renewables. Solar and wind are going to necessarily be overbuilt in terms of peak capacity. If you have enough to power your country on a relatively calm overcast day, what happens on a windy clear day?