PG&E offers plans where off-peak rates are substantially cheaper than peak. So, for example, currently Peak rates are 56 cents/kWh while off peak are 25 cents/kWh.[0]

Not sure if the economics will work out, as in a really long ROI for most people, but even without Solar some of these battery packs can potentially time-shift power for homes, reducing effective rate to be the off-peak rate.

[0] https://www.pge.com/en_US/residential/rate-plans/rate-plan-o...