Theoretically any distance is possible. Practically, we are limited by antenna size considerations.

For example, we are currently looking at powering an island across a distance of 30km with an end-to-end efficiency of around 60%.

Wow! Please do set up an aggressive schedule to build the first space solar station. The Earth urgently needs its Dyson swarm already. With such distances under test you are very close to the goal.

I bet Musk will be your best friend if you brief him with such project ;)