Collect solar power in orbit (where sunlight is uninterrupted) and microwave[0] it to earth.

[0] https://en.wikipedia.org/wiki/Wireless_power_transfer#Microw...

Batteries?

Starting this year, in Romania you cannot put new PV capacity online without the storage for it, is mandatory. Possibly for existing ones, but I am not sure.

"the problem is what to do when it gets dark"

Batteries (or pumped storage hydro, which is more like a gravity-driven capacitor)