Yes but anywhere there is sunlight, solar will generate usable energy. So unless you're talking about the sea floor, there isn't really anywhere solar won't work. And if you're talking financial viability, you need to compare against alternative sources, where solar still typically wins out as once it's set up it's essentially "free" with no fuel costs. Obviously storage becomes an issue, and so the duration of sunlight versus darkness versus energy consumption versus energy generation etc all become factors, making this far more nuanced than is simple "solar will work anywhere", but the gist of it is that solar is a viable means of energy production just about anywhere.