Wireless energy transfer uses magnetic fields or microwaves to transmit electricity between two objects over short or long distances without wires. Nikola Tesla pioneered this concept in the late 1890s by transmitting energy wirelessly over 40 km. While promising for reducing transmission losses, challenges remain for large-scale adoption including high costs and potential health effects. Space-based solar power satellites aim to overcome some issues by collecting solar energy in space for wireless transmission to Earth.