From the article:
> “The problem with solar in Taiwan is that we don’t have a big area. We have the same population as Australia and use the same amount of electricity, but we are only half the size of Tasmania, and 79 percent of Taiwan is mountainous, so land acquisition is difficult.” Rooftop solar is expensive, and roof space is sometimes needed for other things, such as helicopter pads, public utilities, or water tanks.
the whole country is people living in 10 story apartment buildings. Taiwan looks like this[1], not like suburban Texas where everyone lives in 2k square feet mansions. The very limited roof space/dweller ratio you have in a country like this is indeed used for water storage, helicopter pads, what have you. If you're in a country so sparsely populated where home's are so large that a house can power itself with solar maybe roof solar makes some difference, in a place where you can slap 2 solar panels on a building of 300 people it really doesn't.
[1]https://img.static-kl.com/images/media/54842792-60B3-4C6E-A9...