So what you’re saying is that the general case is that it feeds back into the grid unless there are additional measures taken? But at the same time, it’s not the general case?

I was saying the general case is that they aren’t tied to the grid, but that they could be setup to do so. I’m almost definitely wrong about how often these are tied to the grid though.

Which is why, where I live, you have to register your devices with the utility company.

Yup! I’d be shocked if a country didn’t make you inform your utility.