The Transport-vs-Manufacture Tradeoff
Every kilogram launched from Earth to the lunar surface costs between $50,000 and $500,000 depending on the launch vehicle and mission architecture. A single 1 kW solar panel with mounting hardware masses approximately 5-8 kg. At scale, the energy infrastructure for a lunar ISRU operation could mass tens of tonnes.
The alternative: make the solar panels from lunar materials.
The Blue Alchemist Benchmark
Blue Origin's Blue Alchemist program has demonstrated the conversion of lunar regolith simulant into functional silicon solar cells, aluminum transmission wire, and oxygen — all using molten regolith electrolysis (MRE).
Key parameters from their 2025 Critical Design Review:
- Silicon purity achieved: >99.999% (solar-cell grade)
- MRE operating temperature: ~1,600°C
- Byproducts: oxygen, iron, aluminum
- System maturity: TRL 6 (CDR passed September 2025)
- Next milestone: full autonomous terrestrial demonstration in 2026
The Crossover Question
At what scale does local manufacturing become cheaper than Earth launch?
This depends on four variables we are modeling:
- Launch cost trajectory — SpaceX Starship targets ~$200/kg to LEO, but trans-lunar injection and soft landing multiply this by 10-50x. Cost trends matter as much as current prices.
- In-situ panel efficiency — Regolith-derived solar cells currently achieve lower efficiency than terrestrial panels. If in-situ cells reach 15% efficiency versus 30% for imported cells, you need twice the area for the same power output.
- Manufacturing energy cost — The MRE process itself requires substantial energy. There is a bootstrapping problem: you need energy to make energy infrastructure.
- Panel lifespan under lunar conditions — Dust degradation affects both imported and in-situ panels equally, but in-situ manufacturing enables replacement at marginal cost.
Preliminary Analysis
Our initial modeling suggests the crossover point occurs when cumulative lunar surface power demand exceeds approximately 500 kW — roughly the scale of a permanent outpost with active ISRU operations. Below this threshold, importing panels from Earth is more mass-efficient. Above it, the economics shift in favor of local manufacturing, assuming Blue Alchemist-class conversion efficiency.
This analysis is sensitive to launch cost assumptions. If Starship achieves its cost targets, the crossover moves higher. If launch costs plateau, it moves lower.
Current Work
We are refining the crossover model with updated parameters from Blue Origin's CDR results and SpaceX's 2025-2026 Starship flight data.