By David Heinsloff
Solar power remains the fastest-growing energy technology in the world. In 2024, global installations surpassed 400 GW for the first time. Yet behind the boom lies a turbulent supply chain in transition.
China’s dominance
China produces more than 80% of the world’s solar modules, giving it near-monopoly power over pricing. That has driven down costs globally but created dependence that makes Western policymakers uneasy.
Trade frictions
The U.S. has responded with tariffs and subsidies aimed at building domestic manufacturing. The Inflation Reduction Act offers billions in incentives for U.S.-based solar factories. Europe, too, is pushing “strategic autonomy,” though high costs make reshoring difficult.
Polysilicon glut
Meanwhile, oversupply of polysilicon — the key material for solar cells — has squeezed producers. Prices have collapsed, leaving some Chinese companies operating at losses just to protect market share.
Developer perspective
For developers, cheap modules are a blessing. But uncertainty about supplier viability poses risks. If manufacturers go bankrupt, warranties and after-sales service may evaporate.
Future challenges
Solar’s growth is constrained less by technology than by grid integration. In markets like California, curtailment is rising as midday solar floods the grid. Energy storage and flexible demand are now the bottlenecks.
The solar shake-up is both a success story and a warning. Costs are lower than ever, but supply chain fragility and grid challenges must be solved to keep the boom sustainable.
