Starpath pivots to space solar with ultra-thin $15/W panels

What's the deal? Starpath Space has launched Starlight Air, a new line of ultra-thin space solar panels weighing just 73g per square metre and priced at around $15 per watt. The California-based startup — originally founded to produce rocket fuel on other planets — pivoted to solar after finding no commercial panel came close to meeting its own power needs.

Why now? The satellite industry is under constant pressure to cut launch costs, and power capacity is a key constraint. Heavier panels mean higher launch bills; Starpath is betting that a panel thin enough to approach the physical limits of solar cell design will unlock satellite architectures that weren't previously viable.

What could go wrong? At $15 per watt, Starlight Air costs roughly 34% more than the company's own Starlight Classic panel, which comes in at around $11.20 per watt. Starpath also has no large-scale production capacity yet — it plans to break ground on a 50MW facility this year, meaning early customers are relying on limited output from its current site. For a startup that only raised $12 million in seed funding in 2024, scaling manufacturing while managing customer commitments is a precarious balancing act.

The signal: Starpath's pivot from interplanetary fuel to solar panels is an unusual origin story, but it points to something real: the commercial space supply chain still has significant gaps, particularly at the high end of performance.

The fact that a startup had to build its own panels because nothing on the market was good enough — in terms of cost, volume, or weight — suggests the sector's component suppliers have not kept pace with satellite operators' ambitions. If Starlight Air performs as advertised, it could set a new baseline for what space solar looks like.

Source:
PayLoad Space

Image: Starpath Space

A.M.