Great for them, I guess. I live thousands of miles away from Java. You? The point isn’t “there are 1500 active volcanoes on the planet”, the point is is “there are many places not in the proximity of one of 1500 active volcanoes”.
Even if it's not the cheapest option, if it can provide some backup, that could be an option. Because solar panel and hurricanes are not best friends.
[0] that kills 30k people in 1902 : https://en.wikipedia.org/wiki/1902_eruption_of_Mount_Pel%C3%... [1] https://www.emsc-csem.org/Earthquake_information/earthquake....
Theory was that both wind and solar are too risky due to the frequent hurricanes. But maybe there's more local nuance? Too cheap diesel?