Chinese engineers are building the world’s first full-chain ground verification system for a space-based solar power station, with plans to scale the technology to over 100 kilowatts of orbital energy generation by 2030. The effort, known as the Sun-Chasing Project, aims to prove that sunlight collected in orbit can be wirelessly transmitted to Earth, a concept that could eventually supply continuous power to typhoon-battered coastal regions where ground-based grids regularly fail. If the timeline holds, China would become the first nation to operate what researchers have called a “space power bank,” turning an idea that has lingered in science fiction for decades into working infrastructure.
The Sun-Chasing Project and Its Ground Tests
At the center of this push is the Sun-Chasing Project, described in a series of peer-reviewed papers published in the journal Engineering as the first full-chain verification system for a space-based solar power station, or SSPS. Unlike earlier concept studies that modeled individual components in isolation, this program ties together the entire energy pathway: solar collection in simulated orbital conditions, conversion to microwave or laser energy, wireless transmission across distance, and reception on the ground. The goal is not just to prove that each step works on its own, but to show that the entire chain can operate continuously and efficiently as an integrated power plant in space.
Multiple studies in the same journal document different subsystems of the project, covering key structural issues, heat control methods, and the mechanics of keeping a massive orbiting array pointed at a ground receiver with enough precision to be useful. Another paper details how multiple subsystems interact when operated together, highlighting both the gains from integration and the new failure modes that appear when everything is linked. A separate Engineering study explores the project’s end-to-end energy pathway, offering outside researchers a rare look at how close the technology actually is to orbit-ready hardware. That level of technical transparency is unusual for a program with clear strategic value, and it suggests Chinese institutions are seeking international scientific credibility alongside national energy goals.
Microwave Transmission and the Xidian Breakthrough
One of the hardest problems in space-based solar power is getting energy from orbit to the ground without losing most of it along the way or creating safety hazards on the surface. Professor Baoyan Duan of Xidian University has led a team that developed an optimal design method for microwave power transmission, published as a peer-reviewed paper in Engineering that focuses on beam efficiency and safety constraints. The method addresses how to shape and aim a microwave beam so that a ground-based receiver captures the highest possible share of transmitted energy while keeping surrounding areas within internationally accepted exposure limits. That balance is critical if space solar is ever to move beyond small test ranges into populated regions that actually need emergency power.
According to Duan, the 2030 target calls for expanding the solar array to generate over 100 kilowatts and testing medium-power laser transmission across significant distances, as reported by China’s science authorities in an overview of the Sun-Chasing roadmap. That 100-kilowatt figure may sound modest next to a conventional power plant, but it would represent the first time any nation has beamed meaningful amounts of solar energy from a space-grade system to a terrestrial receiver. The planned laser tests are equally significant: lasers offer higher energy density than microwaves but demand even tighter pointing accuracy and more sophisticated safety protocols. Proving that both transmission modes can work under realistic conditions would give engineers flexibility to match the link to weather, distance, and local regulatory requirements.
Ground-Based Solar as a Parallel Track
China’s orbital ambitions do not exist in a vacuum. On the ground, the country is simultaneously constructing what NASA’s Earth-observing program has documented as an immense solar complex with specific dimensions and multi-gigawatt capacity targets, also expected to be finished by 2030. The scale of this terrestrial buildout dwarfs anything attempted elsewhere, and it serves a dual purpose: it feeds electricity into the national grid while also providing a testing ground for the power-conversion and grid-integration technologies that an orbital station would eventually require. Engineers working on space-based solar need to understand how intermittent, wirelessly delivered power interacts with existing infrastructure, and a massive ground array offers a live laboratory for those questions.
The parallel tracks also reveal a strategic hedge. Ground-based solar is proven technology with declining costs, while space-based solar remains expensive and unproven at scale. By advancing both simultaneously, Chinese planners ensure that even if the orbital timeline slips, the country still adds significant renewable capacity and experience managing high solar penetration on the grid. For typhoon-prone coastal provinces, though, the orbital option carries a distinct advantage: a satellite in geostationary orbit collects sunlight around the clock, unaffected by clouds, rain, or the storm systems that can knock out ground panels and transmission lines for days. That resilience gap is what makes the “space power bank” concept more than a prestige project and turns it into a potential backbone for emergency response.
Typhoon Resilience and the Real Stakes
Most coverage of China’s space solar program frames it as an energy story, but the more consequential angle is disaster infrastructure. Typhoons that strike China’s southeastern coast routinely destroy power lines, flood substations, and leave millions without electricity during the most dangerous hours of a storm’s aftermath. A functioning SSPS could beam power directly to portable ground receivers positioned in disaster zones, bypassing damaged grid infrastructure entirely. That capability would allow emergency responders to power field hospitals, water treatment systems, and communications hubs even when roads are blocked and local fuel supplies are disrupted. Because the orbital platform would sit above the storm, it could continue generating and transmitting power long after ground-based assets had gone offline.
For planners, the stakes go beyond any single storm. As coastal cities grow denser and more dependent on electrified services, the cost of prolonged outages rises sharply, measured not just in economic losses but in lives. A mature space-based solar network could, in theory, route power dynamically to whichever region faces the most severe disruption, acting as a global reserve that complements local renewables and hardened grids. The Sun-Chasing Project is still far from that vision: the current focus is on proving basic feasibility at tens or hundreds of kilowatts, not building multi-gigawatt orbital farms. Yet the research now underway (on beam control, structural deployment, thermal management, and ground integration) lays the technical groundwork for a future in which orbiting solar stations are judged less by their novelty and more by how reliably they keep the lights on when everything on the ground has failed.
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*This article was researched with the help of AI, with human editors creating the final content.
