Space-based solar power is moving from thought experiment to funded orbital demo
Space-based solar power has been theoretically sound since a 1968 paper by aerospace engineer Peter Glaser: put solar panels in orbit, where sunlight is roughly six times more consistent than on the ground and unaffected by weather or nightfall, then beam the collected energy down to Earth via microwave or laser. For fifty years it stayed a thought experiment, blocked by one number — launch cost per kilogram. In 2026, that number has fallen far enough, and enough capital has moved in, that the idea is now backed by real contracts and real hardware in orbit, not just white papers.
The clearest signal came in April 2026, when Overview Energy secured a capacity reservation agreement with Meta for up to 1 gigawatt of orbital solar capacity, targeted for data center power delivery by 2030. Overview's own orbital demonstration isn't scheduled until January 2028, meaning Meta is contracting for power from hardware that doesn't exist yet — a bet that only makes sense if the economics of AI-driven data center power demand have gotten desperate enough to justify it. Overview also holds a U.S. Air Force contract studying military base applications, adding a second, non-commercial demand signal to the mix.
The Money Is Already Moving
Overview isn't the only company attracting serious capital. Florida-based Star Catcher raised a $65 million Series A in 2026, bringing its total funding to $88 million, to build a constellation of power-beaming “nodes” designed to recharge client satellites via laser rather than power ground targets — a narrower but nearer-term business case. In April 2026, Star Catcher completed an on-orbit precision acquisition and tracking demonstration, with a further in-space test planned later in the year. Luxembourg's TerraSpark closed a €5 million pre-seed round in March 2026 for modular space-based solar hardware, with a ground demonstration planned to validate wireless power beaming over a defined distance before any orbital attempt. UK-based Space Solar was selected for NATO's DIANA defense-innovation cohort in 2026 — a signal that space-delivered power is now being evaluated as a strategic defense asset, not just a clean-energy bet.
Government Programs Are the Load-Bearing Infrastructure
Private funding is filling in the commercial edges, but the expensive, high-risk architecture work is still largely government-funded. The European Space Agency's SOLARIS initiative commissioned two commercial-scale concept studies and holds a budget in the hundreds of millions of dollars through 2027 for architecture trade-offs and ground receiver validation — the unglamorous engineering that determines whether a beamed-power system can be built at all. The UK backs the CASSIOPeiA architecture through an innovation partnership between Space Solar and Thales Alenia Space UK, with the government's Net Zero Innovation Programme allocating £4.3 million specifically toward lightweight truss structures and adaptive rectennas — the ground-based receiving antennas that convert a beam back into usable electricity. Japan's JAXA is furthest along on an actual orbit-to-ground test: its OHISAMA program targets a 180-kg satellite transmitting roughly 1 kW from low Earth orbit to a rectenna in Japan, aiming to be the first meaningful-distance orbital-to-ground power transfer demonstration.
What “Funded” Doesn't Mean Yet
None of this means gigawatt-scale orbital solar is imminent. The market is still tiny in absolute terms — projected at $713 million globally in 2026, growing to an estimated $4.61 billion by 2041 at a 13.24% CAGR, according to Mordor Intelligence. That's a real, investable growth curve, but it's a rounding error next to terrestrial solar or nuclear. The near-term commercial cases that are actually shipping hardware — Star Catcher's satellite-to-satellite power beaming — sidestep the hardest problem (beaming meaningful power through the atmosphere to a ground rectenna) in favor of an easier one (beaming power between two objects already in vacuum). Ground-to-orbit power delivery at Meta's contracted gigawatt scale remains, for now, a 2030 promise underwritten by 2026 capital.
For readers tracking the space economy: the signal worth watching isn't the headline funding numbers, it's whether JAXA's OHISAMA program successfully completes its low Earth orbit-to-ground transmission test. That's the first real-world validation of the core physics at any meaningful distance, and a clean pass or failure there will do more to set realistic timelines for the Overview–Meta deal than any subsequent funding announcement.