I get the benefits of that, and, that sort of megastructure power generation requires massive investment in power plants and a grid to carry the power.

One of the great things about solar is you don't need megastructures or thousands of miles of cables, because you can generate power directly where it's needed - need more power, add more panels. One of the great things about batteries is they work the same way.

That's a boon for industry in rural areas with poor infrastructure, like, say, rural India. You don't need to rely on a power plant hundreds of miles away to power your factory. You don't need to trust the government to keep the power grid intact and stable. You don't need to worry the government will divert the power you need in order to power the President's brother's data center or whatever. You plop down your solar panels and battery bank and get to work.

(That's a disappointment from the article. India's building an enormous solar megastructure way out in a rural area without the power transmission infrastructure to get the power where it's needed. Smells like graft.)