China could produce more batteries than global demand by 2030, says U.S. think tank

A new report says China's battery manufacturing could produce far more than the world will actually need by 2030. The country's factories could turn out between roughly 5,862 and 6,720 gigawatt-hours of battery cells a year by then, while global demand is only expected to reach 4,000 to 5,100 gigawatt-hours. By comparison, factories in the US, Europe, and other developed economies are expected to produce far less.

This matters for home battery storage because China dominates production of lithium iron phosphate (LFP) batteries, a chemistry now used in about half of all lithium-ion batteries worldwide, including many home solar-battery systems. China makes about 98% of the world's LFP cells, and its batteries are notably cheaper than those made elsewhere, sometimes by a quarter to half the price. That price gap could keep battery storage affordable for homeowners, but it also means the supply chain is concentrated in one country, which the report flags as a vulnerability. A newer battery type, sodium-ion, could follow the same pattern, while the US and its allies are said to have a stronger footing in emerging technologies like silicon-anode and lithium-metal batteries.

The report's authors aren't calling for a total split from Chinese suppliers. Instead, they suggest partnerships between Western and Chinese battery makers, especially in areas where other suppliers are scarce, along with more coordinated policy among the US, Europe, Japan, and South Korea, and support for sodium-ion manufacturing outside China. For homeowners, the practical takeaway is that battery prices for solar and storage systems are likely to stay shaped by Chinese manufacturing for years to come.