Not really an answer to your questions, but just to add:
Solar (and wind) projects don't have the tendency to balloon in costs as other large infrastructure projects do [1]. They tend to be more modular then for example nuclear, making them easier to build (you place one rack of solar panels, and then another one, etc). Additionally, once (a part of) the panels is installed, you can already start generating energy rather than having to wait until the whole project in finalized.
Some parts of the project like the cable between Australia and Singapore to transmit energy might be a different story though.
Solar (and wind) projects don't have the tendency to balloon in costs as other large infrastructure projects do [1]. They tend to be more modular then for example nuclear, making them easier to build (you place one rack of solar panels, and then another one, etc). Additionally, once (a part of) the panels is installed, you can already start generating energy rather than having to wait until the whole project in finalized.
Some parts of the project like the cable between Australia and Singapore to transmit energy might be a different story though.
[1] https://www.fastcompany.com/90844859/why-massive-wind-and-so...