JAXA's OHISAMA project is advancing its ambitious plan to demonstrate space-based solar power in 2026.
The goal is to collect solar energy in orbit and wirelessly beam it down to a receiving station on Earth. This technology, if successful, could provide a near-constant source of clean energy, unaffected by weather or time of day, eventually aiming for commercial use by 2050.
However, the project faces a critical and immediate challenge: its ride to space. The designated launcher, Space One's Kairos rocket, has suffered three consecutive failures, most recently in March 2026. This puts the original 2026 demonstration schedule at significant risk and forces JAXA to explore backup options, such as Japan's reliable H3 rocket or commercial providers like Rocket Lab.
Another point of discussion is cost. JAXA aims for a long-term cost of around 8 yen per kilowatt-hour. While this is competitive with some global benchmarks for solar energy, it's currently much higher than the 4-5 yen prices seen in recent Japanese solar auctions. This highlights that OHISAMA's initial value isn't about being the cheapest option today.
Instead, its strategic importance lies in its unique capabilities. First, it offers firm, dispatchable power. Unlike ground-based solar or wind, which are intermittent, space-based solar can generate electricity over 90% of the time. This aligns perfectly with Japan's new energy policy, which is shifting focus from simply adding renewable capacity to ensuring grid stability and reliability.
Second, the core technology has been steadily advancing. The concept isn't just theoretical. Caltech successfully demonstrated a detectable power beam from space in 2023, and Japanese researchers have validated key technologies like long-range beam steering. These milestones reduce the technical risk and build confidence that an orbital demonstration is the logical next step.
In summary, the OHISAMA project is a high-stakes technology pathfinder. Its success hinges on overcoming the immediate launch hurdle and proving that it can safely and precisely deliver power from space. If it succeeds, it could become a cornerstone of Japan's future energy security and decarbonization efforts.
- Space-Based Solar Power (SBSP): A system that captures solar energy in space and transmits it wirelessly to Earth.
- Rectenna (Receiving Antenna): A special antenna used to convert microwave energy back into direct current (DC) electricity.
- Levelized Cost of Energy (LCOE): The average net present cost of electricity generation for a power plant over its lifetime, used to compare different generation methods.