> Solar in Virginia (not particularly sunny).
I work with solar, not directly but we turn investor money into solar plants, and part of that is getting the most money out of them as possible. The amount of sun obviously matters, but the temperature matters more. The hotter it gets the less efficient the solarpanels become at generating electricty.
The efficiency starts dropping by around 0.5% for every degree celcius above 25 degrees celcius. In hotter climates, you can build solarplants differently, similarly to the one in that james bond movie I believe, not too sure as we don't do that, and I'm obviously not into the engineering part. I mean, I've read the manual of some solarinverters, but that was to get data out of them. Aside from that, solarplanes do actually generate power on cloudy days, not as much, but the only thing that really stop them is snow. The coolest thing about solar, is that it's very predictable. We can basically forecast our budgets for decades to come, because we know exactly how much energy we're going to be producing each month, and with the advances in storage, you'll soon be capable of storing excess power for nights.
Anyway, areas with 10-35 degree celcius are often better suited for solar power than hotter areas with more sun. That's not to say you shouldn't build solar in hot areas, but if you're planning where to put your solar powered factory down, you're likely going to take that into account. Along with a range of other things. I'd wager that logistics and taxes were more important for Lego.