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Whole house backup battery systems. Whether it's a self contained unit or a control unit to diy such a set up with a collection of second hand batteries, these seem to be coming down in cost per kWh over time.
Trouble is, owning a home to install such a system is getting less and less affordable. Renter friendly units may be the way backup power becomes affordable.
Also, I think large backup generators will be sold relatively cheap by people who bought a battery pack and home solar.
I think the price will come down rapidly as lithium ion batteries get swapped out of EVs. Usually they're still plenty usable, just not energy dense enough for a car anymore. Honestly, I hope that becomes how we "dispose" of used batteries in the future, or at least part of a longer chain.
That's right! I do hope it's the default second use for ev batteries.