Solar is the clearest example of a manufacturing base concentrating in one country. Analysis published in 2026 put China’s share of global production at roughly 93 percent for polysilicon, 97 percent for wafers, 92 percent for cells and 86 percent for modules. Those are not the numbers of a competitive market. They are the numbers of an industrial strategy that worked.
How it happened
- Scale economics: building capacity at a size no other market attempted drove unit costs down faster than anywhere else.
- Vertical integration: polysilicon, ingots, wafers, cells and modules sit in one industrial ecosystem, which shortens the feedback loop between stages.
- Policy support: cheap finance, land and power lowered the cost of capital for capacity that took years to pay back.
- Learning by doing: each generation of lines improved yield, and yield is the real cost driver.
The consequence nobody priced
Capacity grew faster than demand. Module prices fell hard enough to compress margins across the entire chain, including for the companies that built the capacity. A dominant position is not automatically a profitable one, and the sector has spent recent years consolidating.
Why the concentration is hard to reverse
Building a wafer plant elsewhere means competing against a supply chain that already has scale, yield data and cheap capital. Subsidies can fund factories; they cannot instantly fund the process knowledge that makes a factory economic. That is why new capacity outside China tends to start with cells and modules rather than polysilicon.
What happens next
Three plausible paths, often at once: consolidation at home, more assembly capacity abroad to serve protected markets, and a push up the value chain into higher-efficiency technologies. The dependence is not going away quickly, but the shape of it is changing.
The strategic lesson
Solar shows that manufacturing dominance is achievable in fifteen years with patient capital. It also shows the bill arrives twice: first as overcapacity and losses, then as political resistance in every market you export to.
Bottom line: the world’s solar supply chain runs through one country, and the energy transition is cheaper for it and more exposed because of it.
