Space energy at scale

We build the lightest way to power space infrastructure: solar thin enough to roll up for launch and unroll in orbit.

Learn more Fly the array

The space economy will need 3 GW of power in orbit by 2035

Legacy solar is too heavy, too costly and too slow to build. Only Arinna has the breakthrough to meet the demand.

50 MW

On-orbit solar today

3,000 MW

On-orbit solar by 2035

About 1 GW added every year

Flexible, power-dense solar for the extremes of space

An Arinna thin-film solar panel bent into an S curve

Arinna is building ultra-thin, truly flexible solar with extremely high power-per-mass and radiation hardness. It stands on more than a decade of semiconductor R&D.

  • Bends tighter than a pencil
  • No cover glass
  • Weeks to build, not a year
Why it matters

Why space needs better solar

The two technologies flying today each fail on a different axis.

Multi-junction

Legacy space solar

Ultra expensive
$500/W production cost
Slow production
12+ month lead time
Rare minerals
Supply regulated by China

Silicon

Legacy terrestrial solar

Heavy
Launch cost climbs with every kilogram
Bulky to deploy
Unfit for agile missions
Radiation sensitive
Output degrades, revenue stranded in orbit

Live · 550 km sun-synchronous orbit

Watch it unroll, then fly an orbit

Two 5.5 m wings unroll, turn to face the Sun and charge the battery. Every 95 minutes the satellite crosses Earth's shadow for about 35 minutes and the battery carries the load. The Sun, the shadow and the orbit are computed for 1 October 2026.

Fix the wings to zenith or double the load, then see if the battery makes it through the next eclipse.

Efficiency and power-per-mass are Arinna’s published figures. Wing size, load and battery are illustrative. Swap in measured numbers and this becomes a spec sheet.

Run it headless ↗

Same power, a tenth of the mass

This array peaks at 6.5 kW. On Arinna film it weighs 6.5 kg. A legacy array making the same power weighs 65 kg.

6.5 kg

Arinna array

65 kg

Legacy array, same power

$381k

Launch cost saved

at $6,500/kg rideshare

$3.3M

Multi-junction cells for the same array

at $500/W

Legacy array at 100 W/kg, the top of what flexible arrays fly today (NASA small-spacecraft state of the art, 2024). Arinna at 10× that, per arinna.xyz.

2D semiconductors redefine the limits of solar power

High-performance
10x higher power-per-mass
Up to 32% efficiency
Ultra flexible
Bends tighter than a pencil
Minimal stowed volume
Space durable
15+ years lifetime
No need for cover glass
Low-cost
6x cheaper than silicon
for the customer
Made in USA
Secure supply chain
Rapid production
Weeks-long lead time
A satellite with two flexible solar wings

Using sunlight to reach the stars

Arinna exists to power a sustainable future for humanity, on Earth and beyond. It was founded by two Stanford PhDs with astronomical ambitions.

Open roles

Leading investors

  • SpaceCadet Ventures
  • Breakthrough Energy
  • Anorak Ventures

Partners

  • NASA
  • US Army
  • NSF
  • Stanford HIT Fund
  • TomKat Center
  • StartX
Contact

About the Arinna simulation

A live power simulation of a flexible thin-film solar array in orbit

Array
2 × 1.6 m × 5.5 m thin-film wings, 6.5 kW peak (illustrative size)
Cells
Up to 32% efficiency, 10× power-per-mass (Arinna’s published figures)
Orbit
550 km sun-synchronous, 10:30 LTAN, 95.5 min period, ~35 min eclipse
Mass
6.5 kg vs 65 kg for a legacy array at 100 W/kg

A browser simulation of two 5.5 m thin-film wings on a satellite in a 550 km sun-synchronous orbit: they unroll, rotate to track the real Sun, and charge a battery that carries the load through Earth’s shadow every 95 minutes.

Questions

Is the eclipse real?+

Yes. The Sun position and Earth’s shadow are computed for the simulated date and orbit, not animated.

Where do the mass numbers come from?+

A legacy array at 100 W/kg (the top of flexible arrays flying today, per NASA’s 2024 small-spacecraft state of the art) and Arinna at 10× that, per arinna.xyz.