Powering Earth Safely from Space
RF wireless power transmission is proven, safe, and regulated — with power density lower than sunlight. Here's the science behind safe space-to-Earth energy delivery.
TerraSpark uses radio frequency (RF) wireless power transmission to deliver energy from space to Earth, operating in the same spectrum as WiFi, mobile phones, and satellite television. The RF power density received at ground stations is lower than the intensity of natural sunlight, with a peak of approximately 250 W/m2 at the receiver compared to sunlight's peak of approximately 1,000 W/m2. The International Commission on Non-Ionizing Radiation Protection (ICNIRP) sets a reference level of 10 W/m2 for continuous RF exposure, and any spillover beyond the rectenna is designed to remain below this threshold.
The article addresses the weaponisation concern by explaining that RF power transmission requires coordinated beam shaping, precise alignment between transmitter and receiver, continuous two-way communication, and distributed power reception across large ground arrays. The maximum power density is physically limited by the transmitter dimensions, making the system architecture fundamentally incompatible with weaponisation.
TerraSpark notes that RF passes through clouds, rain, and fog with minimal attenuation. Even at terawatt-scale deployment, the atmospheric impact would be negligible compared to the approximately 170,000 TW of natural solar radiation Earth receives continuously.