we have two options here: We either improve the power grid all around the world, so whenever it's dark in one side of the planet, the other side, sunny, feeds t

we have two options here: We either improve the power grid all around the world, so whenever it's dark in one side of the planet, the other side, sunny, feeds the darker part; or we start investing heavier on other renewable sources not depending on the sun, to provide the required energy for those nights and cold evenings in the the winter months.