I agree that most countries are not critically limited by land when it comes to solar power, but there are a couple of problems with your figures. The US consu

I agree that most countries are not critically limited by land when it comes to solar power, but there are a couple of problems with your figures. The US consumes nearly 29000 TWh of primary energy per year, of which about 3700 TWh ends up as usable electricity: https://flowcharts.llnl.gov/content/assets/images/charts/Energy/Energy_2017_United-States.png https://flowcharts.llnl.gov/content/assets/images/charts/Ene... (1 "quad", quadrillion BTU, is 293 TWh.) The other is that you're estimating the energy of the sunlight that falls on 77.5e6 m^2 rather than the achievable electrical generation. The most efficient terrestrial solar panels are just a little above 20%.