The problem is the legislation doesn't currently allow for solar to run right into an outlet in the US because it's unsafe without the right cutoff devices (like Germany has), but no one is manufacturing the devices cause the legislation doesn't allow for things like that to exist (and the voltage/frequency is different, so you can't just import one).

I think Utah was just the first state to enable it, so hopefully this spur wider adoption.

https://grist.org/energy/balcony-solar-took-off-in-germany-why-not-the-us/