Musk has often said that Orbital solar is incredibly stupid. And it is.
As for the actual uses besides beaming power down, providing additional power to spacecraft in deep space, powering lasers for light sails, or maybe as a directed energy weapon.
> providing additional power to spacecraft in deep space
Very likely an extreme niche application or wont happen.
> powering lasers for light sails
Again, an extreme niche or wont happen.
> or maybe as a directed energy weapon.
Same thing.
In a world where Starship exists, you can throw a deep space probe with gigantic amounts of solar panels, that seems cheaper then having a separate space craft.