What Is Space-Based Solar Power?

Space-based solar power (SBSP) is a concept that has been studied by space agencies and aerospace companies for decades. The fundamental idea is straightforward: place large arrays of photovoltaic panels in geostationary orbit, where they can collect sunlight 24 hours a day, 365 days a year, without atmospheric interference, cloud cover, or the day-night cycle. That energy is then converted into a form of wireless power—typically a microwave or laser beam—and transmitted to a receiving station on Earth, where it is converted back into electricity and fed into the grid.

The key advantage over terrestrial solar power is continuity. Ground-based solar installations produce power only during daylight and are heavily dependent on weather conditions. An SBSP system in geostationary orbit, by contrast, receives nearly constant insolation (about 1,361 W/m²) and can deliver baseload renewable power. This makes it a potentially transformative technology for decarbonizing electricity generation, especially in regions with limited land area or high latitude.

Lockheed Martin, with its deep expertise in satellite systems, advanced materials, and defense-related wireless power technologies, has positioned itself as a leader in turning this long-studied concept into an engineering reality.

Lockheed Martin’s Strategic Interest in SBSP

Lockheed Martin has been actively involved in SBSP research since the early 2000s, when it first began internal studies and small-scale component demonstrations. The company’s efforts are part of a broader portfolio of energy and space technologies, and they leverage decades of experience building large, lightweight deployable structures for satellites, as well as advanced microwave and laser systems originally developed for communications and defense applications.

The company’s approach to SBSP is notably pragmatic. Rather than betting on a single breakthrough, Lockheed Martin is pursuing a modular, incremental development path that focuses on solving specific engineering challenges:

  • Ultra-lightweight, high-efficiency solar panels that can be compactly stowed for launch and then deployed to kilometer-scale dimensions in orbit.
  • High-power microwave transmission systems that can beam energy efficiently over thousands of kilometers with minimal beam divergence and high conversion efficiency at the receiving end.
  • Autonomous satellite platforms capable of assembling and maintaining large solar arrays in orbit, possibly using robotic systems or in-space manufacturing techniques.
  • Safety and regulatory frameworks to ensure that the transmitted beams do not interfere with aircraft, satellites, or human populations, and that the system can be shut down in an emergency.

Lockheed Martin has also collaborated with external partners, including the U.S. Department of Defense and research universities, to advance key subcomponents. For example, the company has worked on high-power rectenna (rectifying antenna) designs and on phased-array beam-steering techniques that allow the transmission beam to be precisely directed to a receiving station while maintaining safe power densities.

Key Technology: Modular Satellite Platforms

A core element of Lockheed Martin’s SBSP strategy is the use of modular satellite platforms. Instead of launching a single, monolithic megawatt-scale power station—which would be prohibitively expensive and risky—the company envisions deploying a constellation of smaller, interconnected satellites that can be assembled in orbit over time. Each module would generate and transmit a fraction of the total power, and the overall system could be scaled up incrementally as demand grows and launch costs continue to fall.

This modular approach is similar to the satellite “buses” that Lockheed Martin already produces for commercial and military communications constellations. It reduces the per-launch cost and allows for redundancy: if one module fails, the rest of the system continues operating. In-orbit servicing and refueling, capabilities that Lockheed Martin has also been developing, could further extend the operational life of SBSP modules.

Wireless Power Transmission Methods

The two main candidates for beaming power from orbit to Earth are microwaves (typically in the 2.45 GHz or 5.8 GHz ISM bands) and near-infrared lasers. Lockheed Martin has experience with both. Microwave transmission offers higher overall efficiency (around 50–70% from DC at the satellite to AC at the ground station) and can be beamed through clouds, while laser transmission allows for smaller transmitter and receiver apertures but is more affected by atmospheric absorption and clouds.

The company has conducted tests of microwave power beaming at its facilities in New York and Colorado, demonstrating that rectennas can convert incoming microwave energy into DC electricity with efficiencies exceeding 80% at the component level. For the full end-to-end chain—from solar array to beam to ground receiver—Lockheed Martin aims for an overall efficiency of at least 30%, which would make SBSP economically competitive with other renewables when launched costs drop below $500/kg.

Challenges on the Path to Commercial SBSP

Despite the promise, the engineering, economic, and regulatory hurdles remain formidable. Lockheed Martin and other SBSP advocates openly acknowledge these challenges, which include:

Launch Cost and System Mass

Even with the advent of reusable rockets like SpaceX’s Falcon 9 and Starship, launching the massive structures needed for a gigawatt-class SBSP system remains extremely expensive. Current costs are roughly $1,500–$2,500 per kilogram to low Earth orbit, and for geostationary orbit the cost can be double that. An operational SBSP station would require hundreds of tonnes of material in space. Lockheed Martin is betting on continued launch cost reductions, in-orbit assembly to avoid launching a single heavy piece, and advanced lightweight materials (such as carbon composite trusses) to bring total system mass down.

Beam Safety and Regulation

The microwave beam from an SBSP station will have a power density at the ground receiver of roughly 0.2–0.5 kW/m², similar to natural sunlight. However, the beam must be intensely focused to maximize efficiency, and any leakage outside the designated area must adhere to international safety standards (e.g., the ICNIRP guidelines). Lockheed Martin has developed adaptive beam-steering technology that can “paint” the receiver and automatically shut off if the beam drifts off target or if an aircraft or satellite enters the path. Regulatory approvals from bodies such as the International Telecommunication Union (ITU) and national aviation authorities will be required before any operational deployment.

Space Debris and Orbital Maintenance

A large structure in geostationary orbit would be a tempting target for space debris. Lockheed Martin’s design includes self-healing panels and redundant power paths, but debris mitigation is a concern. The company is also exploring active debris removal concepts, as well as orbital maneuvers to avoid collisions. In addition, the solar arrays will degrade over time due to radiation and micrometeoroids, so periodic servicing (replacing damaged panels or boosting the orbit) will be needed—another area where Lockheed Martin’s space logistics experience is relevant.

Economic Viability Compared to Terrestrial Renewables

The current cost of terrestrial solar plus battery storage has fallen below $60 per megawatt-hour in many sunny regions, and it continues to decline. For SBSP to compete, its levelized cost of energy (LCOE) must be at or below that threshold. Lockheed Martin’s internal models suggest that a first-of-its-kind SBSP demonstration in the 2030s could produce power at around $100–$150 per MWh, with subsequent generations falling to $50–$75 per MWh once the technology matures and launch costs drop to $200/kg. That timeline aligns with the company’s long-range planning, but is still a steep hill to climb.

Lockheed Martin’s Testing and Demonstration Milestones

Lockheed Martin has already achieved several key milestones in SBSP research:

  • 2015: Successfully demonstrated a microwave wireless power transmission system at its facility in Syracuse, New York, beaming 1 kW over a distance of 1 km with an efficiency of 45%.
  • 2018: Unveiled a thin-film solar array design that achieves 33% efficiency in a laboratory setting while weighing less than 1 kg per square meter—ideal for large-scale deployment.
  • 2021: Partnered with the Air Force Research Laboratory to study the use of SBSP for forward-deployed military bases, which require secure, on-demand power without relying on vulnerable fuel supply lines.
  • 2023: Conducted a ground-based test of a scalable phased-array transmitter capable of beam-steering with sub-millisecond response time, crucial for tracking moving ground receivers and avoiding obstacles.

These incremental steps are deliberately aimed at reducing the technology readiness level (TRL) gaps that have kept SBSP from moving beyond concept studies. Lockheed Martin expects to have a small-scale orbital demonstrator (generating 10–100 kW) by the early 2030s, assuming continued funding and favorable policy support.

The Broader Context: Global Interest in SBSP

Lockheed Martin is not alone in pursuing space-based solar power. The Japan Aerospace Exploration Agency (JAXA) has conducted multiple ground and aerial tests of microwave power beaming. The UK Space Agency is funding studies for a “space solar” demonstrator by 2035. The European Space Agency’s SOLARIS program aims to assess the feasibility of SBSP for European energy needs. And the U.S. Department of Energy has reinvigorated its interest through the Space Power and Energy Initiative.

Lockheed Martin’s competitive advantage lies in its integrated approach: it can design, build, launch, and operate the entire system, from the solar panels to the ground station. Its history of managing complex space programs—such as the Orion spacecraft, GPS satellites, and missile defense systems—gives it credibility with both government and commercial customers.

Environmental and Geopolitical Implications

If SBSP becomes commercially viable, it could fundamentally reshape the global energy system. Unlike terrestrial solar and wind, SBSP is not geographically constrained: it can be delivered to any location on Earth where a receiving station can be built. That includes remote islands, disaster zones, and developing nations with poor grid infrastructure. It also means that energy could be transmitted across borders without the need for pipelines or high-voltage power lines, potentially altering energy security dynamics.

From an environmental perspective, SBSP avoids the land-use conflicts associated with large solar farms and wind parks. A single 2 GW SBSP station in orbit would require a ground receiver about 5–10 km² in area (depending on latitude and beam efficiency), whereas a terrestrial solar farm of the same capacity would need roughly 20–30 km². The upper stages of the launch vehicles used to build SBSP would produce greenhouse gas emissions, but lifecycle analyses suggest that the total emissions per MWh from SBSP are comparable to or lower than those from terrestrial solar PV, and far lower than natural gas or coal.

What the Future Holds

Lockheed Martin’s leadership has stated that space-based solar power is a “when, not if” technology. The company continues to invest in the necessary building blocks: advanced photovoltaics, high-efficiency power electronics, adaptive beamforming, and modular satellite architectures. As Lockheed Martin’s SBSP page notes, the company is “pushing the boundaries of what’s possible” to deliver “clean, abundant energy from space.”

Critical milestones in the next decade will include a dedicated orbital test flight to validate power generation and beam transmission in the space environment, as well as the first commercial ground station designs. If those tests succeed, and if launch costs continue to fall as expected, the first commercial SBSP plants could begin operation in the 2040s. For now, Lockheed Martin’s work represents the most concrete step yet toward a future where the sun’s energy, collected above the clouds, powers our world around the clock.

For more information on the broader efforts and challenges, see the NASA SBSP studies and recent SpaceNews coverage of SBSP developments.