Transmission of energy through the air.

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Nikola Tesla dreamed of a wireless world, where poles and cables are just memories of the past, a world where electrical energy no longer needs cables to reach where it is needed. Those who know the story of Nicola Tesla say that this was one of his ideas that never got funding, but the most recent tests from DARPA show that the idea of transmitting energy through the air is real and could be closer than we think.

With an energy transmission system based on laser beams, the United States military is challenging the limits of physics and redefining how electricity could be distributed in the future, quickly, without physical contact and crossing kilometers of distance through the air.

The project is called Persistent Optical Wireless Energy Relay (POWER) and its proposal is bold, creating invisible energy lines made of light capable of sending electricity in the same way we transmit data via Wi-Fi or satellite. The operation is as elegant as it is disruptive. The laser transmitter fires a highly concentrated laser that travels for several kilometers until it reaches a structure called PRAD, a type of optical receiver with photovoltaic cells that convert light into usable electrical energy.

https://www.youtube.com/watch?v=F-4fkhWYUDA

During the most recent experiment, the system managed to transmit 800 W for 30 seconds at a distance of 8 km, a new absolute record of power and range for energy transmission using lasers. For now, the tests have been carried out with equipment on solid ground, but DARPA's true plan goes much further, they want to install these emitters and receivers on high-altitude drones, transforming them into aerial displays capable of transmitting energy for hundreds of kilometers.

By operating above the clouds and out of reach of physical obstacles, these relays will allow energy to be sent even to isolated regions, war zones or places devastated by natural disasters, where rebuilding the electrical grid would be impossible or too risky, although current efficiency is barely around 20%, the focus at this time is on stability and range.

Next steps include correcting the beam wavefront, reducing losses, and making the system more accurate and safe in various environments; The impact of technology like this goes far beyond military use, imagine this research bases in remote areas receiving energy directly from the sky, having constant electricity without depending on noisy and polluting generators or even entire cities migrating to an aerial energy infrastructure, without having to rebuild kilometers of cables and poles after each storm.

DARPA is already planning a system capable of transmitting up to 10,000 W over 200 km using conventional drones, paving the way for a new era of energy distribution, without cables, without borders and almost without limits. Of course, such a powerful innovation also raises legitimate concerns. After all, we are talking about high-power laser beams crossing the sky and if something passes by, a plane, a bird, a balloon, engineers are working to mitigate those risks, but the transition from controlled tests to large-scale use will require protocols. rigorous safety standards and international regulations.

You would rely on an invisible network of lasers to power your house or your city, or that wasn't Nikola Tesla's idea.

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