[anovikov]

There is surprisingly little storage (or in some better cases, no storage at all) required to balance renewables and studies from 10-15 years ago confirm it, that's a favourite theme of conservatives but no longer brought up in serious circles. We already have all the production capacity (online and in committed, funded projects) for the required amount of batteries and will have many times more in only a few years - batteries will be there even before solar panels themselves will, mainly because installing them is simpler and they immediately make quick money, payback periods are shorter (and getting shorter as more solar is installed).

[pfdietz]

Also, because we're going to need storage anyway, for vehicles.

A Tesla has maybe 70 kWh of batteries. There are 283 million motor vehicles in the US. Electrify them all at that rate and it's 20 TWh of storage, about 40 hours worth of the average US grid consumption.