I don't know much about residential, but I've been watching battery/solar setups for vans and RVs, and the cost of batteries to store power has been going down a lot.
I wonder if there'd be savings if one set up a "house battery" that only charged at night, then you use the stored electricity during the day.
Maybe hiring an electrician to do it would eat any savings, though.
Although, if one is more of a prepper than simply frugal, setting up a big "house battery" to smooth out electric outages due to thunderstorms or whatever might be nice.