Of course solar power is not limitless. Finite insolation, and finite land mass = finite resource. But, you could generate the entirety of US energy usage fr

Of course solar power is not limitless. Finite insolation, and finite land mass = finite resource. But, you could generate the entirety of US energy usage from less than 100,000 square miles of solar panels, and quite possibly from less than 50,000 square miles, if you consider wind + solar. That's a lot of land, in one respect, but it's less than, e.g., the amount of land (circa 60,000 square miles) we currently use just to produce ethanol that accounts for less than 10% of just our energy use for small internal combustion engines. The challenge with solar/wind isn't limits on their production due to land, or even infrastructure, it's that they produce intermittently, and only produce electricity, and electricity is challenging to store for extended periods of time so you can match production to demand over time scales from hours to years.