Solar Power From Space Moves Closer to Reality as Startups Test Orbital Energy Beaming

Harvesting solar energy in space and transmitting it to Earth has long been a concept associated with science fiction and Cold War-era research. In recent years, however, advances in launch economics, satellite manufacturing, and wireless power transmission have brought space-based solar power back into serious discussion. A growing number of startups and government-backed programs now see orbital solar as a potential complement to terrestrial renewables in a net-zero energy system.

One of the most visible new entrants is Aetherflux, a California-based startup founded by former tech entrepreneur Baiju Bhatt. The company’s approach, highlighted in a recent Forbes report, focuses on placing relatively compact solar satellites in low Earth orbit that collect sunlight and convert it into radio-frequency energy. That energy would then be transmitted to ground-based receiving stations, where it is converted back into electricity and fed into the grid.

Why Space-Based Solar is Attracting Attention

Solar panels in orbit receive uninterrupted sunlight for most of the year, unlike ground-based systems that face night cycles, weather variability, and seasonal changes. This continuous exposure could theoretically enable much higher capacity factors than terrestrial solar farms. For energy systems increasingly dominated by intermittent renewables, a constant zero-carbon power source is attractive.

Advocates argue that space-based solar could play a role similar to baseload generation, supporting grids as coal and gas plants are phased out. It could also provide power to remote regions, military installations, or disaster-hit areas where grid infrastructure is limited or damaged.

The renewed interest is also driven by falling launch costs. Reusable rockets and higher launch cadence have dramatically reduced the cost per kilogram to orbit compared with a decade ago. At the same time, satellite components have become lighter, more efficient, and more modular, enabling designs that would have been impractical in the past.

Technical Approach and Challenges

Aetherflux’s concept relies on transmitting power using radio frequencies rather than lasers, a choice intended to reduce atmospheric losses and safety concerns. The receiving antennas on Earth, known as rectennas, would cover large areas but could potentially be co-located with agricultural land or other low-intensity uses.

Despite the progress, significant technical challenges remain. Wireless power transmission at a meaningful scale has never been demonstrated from orbit. Ensuring precise beam control, minimizing energy losses, and preventing interference with communications systems are major engineering tasks. Ground infrastructure would also need to be built, adding to upfront costs.

Energy efficiency is another open question. Even modest losses at each stage, from solar capture to conversion, transmission, and reconversion, could reduce the overall competitiveness of space-based solar compared with rapidly falling costs for ground-based renewables paired with storage.

Cost, Policy, and Regulatory Considerations

From a commercial perspective, cost remains the central uncertainty. Building, launching, and maintaining solar satellites is capital-intensive, and early systems are unlikely to compete directly with terrestrial solar or wind on price. Proponents argue that costs could fall with scale and standardization, much as they did for conventional satellites and photovoltaic panels.

Regulation is also a factor. Space-based solar sits at the intersection of space law, spectrum regulation, and energy policy. Frequency allocation for power transmission must be coordinated internationally to avoid interference. Environmental and land-use approvals would be required for large rectenna sites. Governments may also need to clarify liability frameworks in case of system failures.

Public funding has historically played a role in space solar research. Agencies in the United States, Europe, China, and Japan have all explored pilot projects. Analysts note that early commercial deployments are likely to depend on government partnerships, long-term power purchase agreements, or defense applications before broader grid integration becomes viable.

Implications for Net-Zero Strategies

For policymakers and energy planners, space-based solar is unlikely to be a near-term solution to emissions reduction. Most experts see it as a long-term option that could complement, rather than replace, ground-based renewables, nuclear power, and energy storage.

If technical and economic barriers can be overcome, orbital solar could help address one of the hardest challenges of the energy transition: providing reliable, low-carbon power during periods when wind and solar output are low. Its potential role is therefore strategic rather than immediate.

Investors and corporations tracking net-zero pathways are watching these developments closely. While the technology remains high-risk, its promise of constant clean energy has ensured continued interest. Whether space-based solar becomes a meaningful contributor to global electricity supply will depend on the results of upcoming demonstrations and the willingness of governments to support early deployment.

For now, startups like Aetherflux represent a broader trend of revisiting ambitious energy concepts with modern tools. Their progress over the next decade will help determine whether solar power from space remains an intriguing experiment or evolves into a practical component of the clean energy transition.

Source: www.forbes.com