For decades, satellites have relied on solar panels to generate the electricity needed to power their own systems. As missions become more ambitious, however, engineers are beginning to ask a different question: What if spacecraft could generate energy in one place and deliver it somewhere else?

The ability to transmit energy through space has the potential to reshape how future missions operate. Instead of every spacecraft carrying enough power generation and storage for its entire mission, future systems could share energy across satellites, lunar infrastructure, orbital manufacturing facilities, and eventually even receivers on Earth. While these technologies remain under development, they represent one of the most exciting frontiers in space systems engineering.

During our interview, space engineer Benjamin Calloway classifies solar-power satellite technology into three categories, illustrating how concepts which were once science fiction are evolving into a rapidly growing part of the commercial space industry. His perspective highlights the diverse satellite architectures taking shape as companies, governments, and academia work together toward making space-based energy transmission a reality.

Modular Planar Arrays

The most familiar vision of space-based solar power is the modular planar array. Large orbital platforms collect sunlight using expansive solar arrays, convert that energy into electricity, and transmit it to a distant receiver using microwave energy. Modular construction allows these systems to grow over time, creating the potential for utility-scale power generation.

Although often associated with delivering clean energy to Earth, planar arrays could also support large orbital facilities or future space infrastructure requiring significant amounts of continuous electrical power.

Laser Swarms

Calloway’s second topic explores a very different philosophy. Rather than constructing a single massive spacecraft, laser swarms use numerous smaller satellites working together as a coordinated system. Each satellite collects solar energy and transfers power through laser links, creating a distributed network capable of delivering energy where it is needed in a more agile manner.

This architecture offers flexibility that could prove valuable for satellite servicing, in-space manufacturing, defense applications, and future lunar operations, in addition to terrestrial applications.

Reflector Swarms

The third concept, reflector swarms, approaches the problem from another direction. Rather than converting sunlight into electricity before transmitting it, these satellites use lightweight mirrors to redirect sunlight itself.

Redirected sunlight could supplement solar arrays operating in shadow, extend illumination for terrestrial and lunar operations, or provide additional energy to locations where direct sunlight is limited. By eliminating the conversion from light to electricity and back again, reflector systems simplify portions of the overall architecture while opening new possibilities for energy management in space.

One Challenge, Many Solutions

One of the most interesting aspects of emerging technologies is that engineers are still exploring multiple solutions to the same problem. There is no single roadmap for how space-based solar power will mature, and today’s concepts continue to evolve through research, testing, and innovation.

Calloway’s classification reminds us that the future of space-based solar power is about more than generating electricity. It is about building an energy infrastructure that can move power where it is needed, when it is needed. Whether that future is shaped by large orbital power stations, distributed laser networks, reflector systems, or concepts still waiting to be imagined, one thing is becoming increasingly clear: energy will become one of the next great infrastructure systems connecting the space economy.