The line workers would not be aware of power coming from the load side and therefore may accidentally work on a live line and die.
Most rooftop solar that plugs into the grid is set up to switch off if power goes out for this reason.
This is mostly and educated (from a solar class years ago) guess.
Just a picture I took today at the Bamboo Grove behind Tenryu-ji temple in Kyoto.
Kyoto is one of the loveliest cities I’ve seen, but going late July is a very, very sweaty experience.
It was a strawberry purée, but we also got syrup which was just thinned honey. Both were very good.