Suspect a good portion of the storage issues will be resolved by using those electric cars themselves in the long run. For most people on most days - they use their car at most 1-2 hours. The other 22-23 hours its just sitting there.
You'd need to build out infrastructure - but if you can get a two way connection to those cars - they take power during low demand and then sell their stored power during peak demand - you've got a bunch of storage immediately available from cars that are just sitting around all day.
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