I am already using free wireless transmitted fusion energy. (WTF)
Higher technology even yet than a directed beam !
~1kW/m^2
Unfortunately, it only works during the daytime.
boB
A few spaceships with mirrors could solve that problem!
In the "Pinky and the Brain" cartoons, the Brain conspired to purchase all real estate above the 24th floor, infiltrate a NASA space shuttle mission, and melt the polar ice caps with the Hubble telescope.
Some Nazi rocket scientists, led by Hermann Oberth, were working on the design of a large space station ("Raumstation") that would orbit at roughly 1000 km altitude, with a 100 m diameter mirror for focusing solar light to limited spots on Earth. (see V Houghton, "Nuking the Moon", Penguin 2019, pp 206-216.)