One would have to do the math, cost of battery versus 24kw free daily. But clearly for lots of people the math will work.

A side effect of policies like this is effectively getting people to invest capital to time-shift elec usage. That's good policy. Reducing the peaks in consumption solves other problems.

Here in Germany, it is absolutely massive and an increasing number of people run their balcony solar with batteries that just feed into a regular Schuko Plug. It only allows to feed in 800W at a time, but there are workarounds for that as well