This document discusses wireless power transmission systems, which were discovered by Nikola Tesla in 1891 and allow the transmission of electricity from one place to another without wires. It describes various technologies for wireless power transmission over both short and long distances, including inductive coupling, resonant inductive coupling, air ionization, microwave power transmission, and laser power transmission. Microwave power transmission in particular works by converting solar power collected in orbit into microwaves beamed to large antennas on Earth to generate conventional electricity. The document concludes that wireless power transmission has advantages over wired systems like lower maintenance costs and could help address energy crises in the future.