Glancing at the real estate in Tucson, there seem to be an abundance of simple one story structures, lots of brick/stucco/block construction vs. wood. More vegetation than I would have guessed. Significantly fewer solar panels than I would have guessed--even on upper class homes.

I do see some banks of solar panels that could serve as starting points for fires, e.g.:

32.192223636768645, -110.86541009501595

If I were a cabal entity tasked with razing a city like Tucson, I'd initially think to use their power infrastructure. But after glancing at it a bit, I'm inclined to think their style of construction is resistant to it. There's dry vegetation, but not much of it, and it's very low to the ground.

If you did an attack through the power infrastructure, it'd destroy homes, sure, but then people would be aware of that attack vector and they would likely be able to rebuild w/out issues. i.e. I don't think it would create enough damage. It's more useful to be able to light a given house on fire through that attack method than to destroy a city with it and lose the method due to public awareness.

I'm wondering if a chemical or earthquake attack would be more effective in terms of convincing people not to rebuild. You want the victim to perceive it as a 100% loss.