15 March 2026
After more than five decades on the fringes of speculative energy debate, space-based solar power is entering a new era of serious global investment, driven by plummeting launch costs, proven wireless power transmission, and an accelerating global race to secure firm, round-the-clock clean energy.
| MARKET VALUE 2024 $3.1 Billion Global SBSP research & development spend | PROJECTED 2032 $5.72 Billion At 7.9% CAGR – GM Insights | SOLAR INTENSITY IN ORBIT 1,361 W/m² vs ~200 W/m² avg on Earth’s surface | SA SOLARIS BENEFIT ESTIMATE €601 Billion Projected EU benefits through 2070 |
For most of the past half-century, space-based solar power occupied a peculiar position in the energy conversation. It was technically credible enough to attract the occasional government study, yet economically implausible enough to be routinely shelved. That position is now shifting, and shifting quickly.As nations confront the reality that intermittent wind and solar, even when supported by batteries, may not alone deliver the always-on, low-carbon electricity modern grids require, the idea of harvesting sunlight continuously in orbit and transmitting it wirelessly to Earth is being revisited. This time, however, the concept carries genuine engineering momentum.
The Concept and Its Enduring Appeal
The physics of space-based solar power (SBSP) has never really been in doubt. First proposed by American aerospace engineer Peter Glaser in 1968, the concept is elegant in its outline. Large satellite arrays positioned in geostationary orbit, approximately 36,000 kilometres above Earth, collect sunlight uninterrupted by clouds, nightfall, or atmospheric losses. That energy is then converted into microwaves or laser beams and directed toward a ground-based receiving antenna, known as a rectenna, which converts it back into grid-ready electricity.
The appeal is structural. At the top of Earth’s atmosphere, solar irradiance reaches approximately 1,361 watts per square metre, compared with terrestrial averages that vary widely depending on location and time. In geostationary orbit, satellites can achieve nearly continuous solar exposure, generating power around the clock without the storage penalties that increasingly shape the economics of ground-based renewables. The World Economic Forum notes that an SBSP system requires orders of magnitude fewer critical minerals to provide the same continuous power as a terrestrial solar installation paired with large-scale energy storage.
“A new space race for sustainable energy is already underway. The question is no longer whether SBSP is physically possible – it is whether we can build it fast enough to matter.”
From Laboratory to Orbit: The Breakthrough Moment
One of the most significant recent milestones came from the California Institute of Technology. In June 2023, Caltech’s Space Solar Power Demonstrator (SSPD-1) successfully demonstrated wireless power transfer in space and transmitted detectable energy to a receiver on its Pasadena campus. It marked the first time such a transmission had been achieved from orbit to a ground target. The system did not power a city, but it proved a principle. In the long arc of technology development, that proof carries considerable weight.
NASA’s January 2024 assessment acknowledged the achievement while injecting economic realism. The agency’s lifecycle cost estimates for representative SBSP designs placed them between 12 and 80 times the cost of terrestrial renewable alternatives at current technology levels. NASA framed SBSP not as an immediate commercial solution but as a technology worth monitoring, particularly given adjacent investments in in-space servicing, assembly and manufacturing (ISAM), and autonomous robotics that could eventually enable large orbital power infrastructure.
A Global Race Takes Shape
What has changed most visibly in recent years is the geographic breadth of serious national programmes. SBSP is no longer only an American or Japanese curiosity. It has begun to emerge as a strategic priority across several major economies.
Europe
The European Space Agency’s SOLARIS programme, funded at ESA’s November 2022 Ministerial Council, reached a critical decision point in 2025. Member states are now weighing whether to commit to a full SBSP development programme. ESA commissioned independent cost-benefit analyses from Frazer-Nash Consultancy in the United Kingdom and Roland Berger in Germany. The Frazer-Nash study estimated that deploying 54 gigawatt-class satellites between 2022 and 2070 could generate approximately €601 billion in benefits against €418 billion in costs, producing a net present value of roughly €183 billion. ESA estimates that a single solar satellite could deliver up to 2 GW of continuous power to the European grid.
The United Kingdom
The UK has emerged as one of the most active participants in the field, backing development of the CASSIOPeiA architecture. This helical reflector design concentrates sunlight onto photovoltaic strips to minimise active solar cell mass. The Space Energy Initiative, a coalition of more than 90 organisations from industry, academia and government, is coordinating the UK’s effort. UK-based company Space Solar has committed to delivering a commercial demonstration system within six years. Airbus Defence is separately leading the development of modular three-square-kilometre ground antennas designed to integrate with conventional solar farms.
China
China’s programme is arguably the most ambitious in scope. The China National Space Administration plans to use its Tiangong space station to test high-voltage transfer and wireless beaming technologies. The roadmap includes a kilowatt-level low Earth orbit test by 2028, a megawatt-level demonstration station by 2030, and a commercially viable gigawatt-scale facility in geostationary orbit by 2050. China has been developing the Chongqing test facility since 2019, coordinating efforts between the Chinese Academy of Sciences, CAST and several major universities.
Japan
JAXA and Japan Space Systems are advancing the OHISAMA project, a planned demonstration of wireless solar power transmission from a 180-kilogram satellite in low Earth orbit, targeted for launch in 2025. Japan has maintained one of the longest continuous SBSP research traditions of any nation, stretching back decades. The country is widely considered to possess some of the most mature wireless power transmission intellectual property in the world.
“Researchers at King’s College London estimated in 2025 that space-based solar could supply the majority of Europe’s renewable energy needs by 2050.”
The Cost Frontier: Starship and the Launch Economics Question
Every serious analysis of SBSP eventually reaches the same bottleneck: launch cost. Deploying a single gigawatt-scale power station in geostationary orbit could require between 50 and 100 heavy-lift launches. A fleet large enough to make a meaningful contribution to global decarbonisation would demand thousands of launches annually, an order of magnitude beyond today’s global launch cadence.
This is where SpaceX’s Starship programme enters the discussion as a potential game-changer. If Starship achieves its targeted economics of roughly $100 per kilogram to orbit, the transport cost for a 5,000-tonne power station could fall to approximately $500 million. That would represent a manageable fraction of the total capital expenditure for a major power plant.nSpaceX’s Falcon 9 has already normalised reusability in the commercial launch market, and the broader reusable launch ecosystem has fundamentally changed what is possible in orbit compared with a decade ago.
Beyond launch costs, significant engineering challenges remain. Ultra-lightweight modular structures spanning multiple kilometres must be assembled autonomously in orbit by robotic systems that are still under development. Wireless power transmission will need to achieve beam-focusing precision across 36,000 kilometres while maintaining safe power density on the ground. Thermal management of high-power systems in the radiation environment of geostationary orbit will require advances in materials that current satellite programmes have not yet prioritised.
The Finance Gap: Infrastructure Capital in a Venture World
Perhaps the most underestimated challenge is financial rather than technical. SBSP represents a capital-intensive, long-horizon infrastructure investment, precisely the type of project that venture capital is poorly structured to support. The World Economic Forum describes the gap between early-stage private investment and the institutional capital required for deployment as a financial “valley of death”. Pension funds and sovereign wealth funds operate at the necessary scale but typically demand predictable, near-term returns that first-generation space power infrastructure cannot yet guarantee.
To bridge this gap, commercial SBSP developers are constructing milestone-based roadmaps designed to generate value and revenue at each stage before committing to full infrastructure deployment. Early applications may include powering remote installations, military forward operating bases and satellites in low Earth orbit before eventually targeting terrestrial grid supply. This staged approach mirrors the development path that ultimately made terrestrial solar and wind commercially viable through learning curves, declining costs and gradual expansion into larger markets.
What It Means for Sustainability Leaders
For professionals working in sustainability strategy, ESG planning and climate-aligned investment, space-based solar power sits in a category that deserves careful monitoring rather than passive observation. The global SBSP market, currently dominated by research, development and component spending rather than operational revenue, was valued at approximately $3.1 billion in 2024 and is projected to reach $5.72 billion by 2032. That trajectory could accelerate sharply if national programmes targeting demonstrations between 2028 and 2030 meet their timelines.
The strategic value of SBSP extends beyond the electricity it might eventually generate. The World Economic Forum has highlighted its potential for climate equity. With the expensive infrastructure located in orbit and the ground rectenna comparatively inexpensive, developed nations could theoretically deliver clean energy directly to developing regions. This would allow them to bypass fossil-fuel infrastructure altogether, presenting a fundamentally different model for energy justice within the global climate finance landscape.
ESA’s cost-benefit studies add further depth to this argument. In their modelling, many of the benefits arise not only from avoided carbon costs but also from avoided expenditure on terrestrial infrastructure that would otherwise need to be built.In a world where grid investment requirements are already immense, a complementary source of firm clean power that does not compete for land, water or critical minerals in the same way as ground-based renewables could offer structural advantages over a 30- to 50-year horizon.
“SBSP is not a replacement for terrestrial renewables. It is a bet on the kind of firm, dispatchable clean power that the energy transition will increasingly demand – and cannot yet guarantee.”
The Verdict: Worth Watching, Seriously
Space-based solar power has moved beyond the realm of science fiction, though it has not yet reached commercial reality. What it occupies in 2025 is the increasingly important middle ground of climate technology. It has been demonstrated at the subsystem level, carries clear strategic appeal, and now awaits the industrial and financial conditions that will determine whether it scales.
The next five years will be decisive. ESA’s post-SOLARIS programme decision, China’s 2028 low-Earth-orbit demonstration target, Japan’s OHISAMA launch and the continued evolution of launch economics will collectively determine whether SBSP moves toward a meaningful role in the global energy system or returns once again to the category of promising ideas awaiting better conditions.
For sustainability professionals, the message is clear. This is neither a technology to dismiss nor one to oversell. It is a long-horizon infrastructure bet with credible pathways to scale, meaningful implications for climate equity and the rare distinction of offering energy that is truly always on. In a decarbonised energy system, that characteristic may prove exceptionally valuable
