You don't have to take all of it. If you can either vent off energy in a harmless direction or decide to reflect a significant portion back at the sun, it's no

You don't have to take all of it. If you can either vent off energy in a harmless direction or decide to reflect a significant portion back at the sun, it's not a problem. Besides, whatever the power conversion technology is, it's unlikely to be anywhere near 100% efficient. That means you need to be getting rid of thermal energy in large quantities anyway. As long as you're at least pointing that away from Earth, it's a win.