I suspect there are at least a couple of powerful owls frequenting our valley. I have no direct proof. However, good tree cover and ample prey suggest that they would be about. I have only seen a powerful owl once in the wild. I was surprised at the size of this owl. I guess I was used to seeing the considerably smaller boobook owls.
I read an article this morning about how powerful owls are moving into urban areas, particularly as these areas have high numbers of possums, a favourite food. I love hearing stories about creatures adapting to urban areas. Nonetheless, they are still facing challenges. If you are interested in powerful owls, then have a read of Look Up!