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From the previous comment:

> Batteries will probably be cheaper,

The above commenter clearly thinks that batteries are going to provide cheap storage.

If you have some alternative plan for storage at the scale of tens of terawatt hours, please do tell.

I'd imagine we'll probably continue to store power the same way the vast majority of power is stored now, using pumped hydroelectric storage.

Pumped storage is geographically limited: as more convenient sites are developed, viable locations become more and more remote. Hydroelectric storage is great, but not the pumped kind. The energy storage supplies by the Hoover dam, the Coolie dam, dwarf pumped hydro.

It's great for countries that have it, but you're not going to be storing much hydroelectricity outside of mountainous regions.

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