It is not exactly a sci-fi. Soviets used such spacecraft to make a daylight at nights for point-area disaster relief earlier. With bigger geostationary spacecraft you can establish all-time daylight at bigger areas.
Melt the permafrost, release more methane, more Glowbull Warming.
Problem solved...................
Just never heard of it before. I happen to live below the arctic circle. When us folks have emergency situations, me make sure to do it during the day, like most civilized people.