There are countless square miles of vacant land in the USA that are unsuitable for farming and ideal for solar. This might be useful in areas where vacant land is actually scarce.

The US is huge. The problem is efficiency of transmission. But maybe we just install 2x the solar to overcome that? When energy is so low cost we can afford to be a bit less efficient.

A huge amount of corn goes into producing ethanol to burn as fuel in cars. We can safely take a small portion of agricultural land out of "food" production and replace it with photovoltaics and electrical production instead of using it to produce ethanol and produce productive stable returns for farmers instead of subsiding corn and fuel.

That vacant land tends to be far away from electricity users. Not always - lots of desert around Las Vegas - but people historically like settling around arable land. Producing electricity close to where you need it is great, both because of transmission losses and because building more long-distance transmission lines is neither easy, cheap nor fast

The better solution to this vacant land is to remove the regulatory and permitting burden that made it vacant in the first place.

Let the people build.

I feel like starting with parking lots might be better than filling "empty" land though?