A significant petrochemical expansion is underway in Daya Bay, China, where new carbonate-solvent capacity is being added right in the heart of global battery manufacturing. While this won't immediately impact the availability of propylene carbonate (PC), it's definitely a trend worth keeping an eye on.

What’s Going On?

Shell and CNOOC’s CSPC joint venture has announced an expansion in Daya Bay that includes a new facility aimed at producing 320,000 tonnes per year of high-performance specialty chemicals, including polycarbonates and carbonate solvents. According to Shell, the carbonate solvents produced here will be used in lithium-ion batteries and energy storage solutions.

It's important to note that the 320,000-tonne figure refers to the total specialty-chemicals output, not just propylene carbonate. This distinction is crucial. Nonetheless, this project indicates that major players are investing in the broader carbonate-solvent supply chain in China.

Why This Is Important for PC

This investment is strategically located next to the world’s largest battery market. The IEA reported that in 2025, China accounted for about 60% of global electric vehicle (EV) battery deployment and more than 80% of the world’s lithium-ion battery manufacturing capacity.

For those purchasing PC, the increase in regional carbonate-solvent capacity could eventually shift supplier competition, affect export economics, and alter the dynamics between Asian and domestic sourcing. The actual impact will hinge on the specific products produced, qualification requirements, operating rates, and how much of the output remains within China.

What Buyers Should Keep an Eye On

1  Project timing and product offerings. Buyers should monitor which carbonate solvents are produced and when they will be available in commercial quantities.

2  Domestic battery demand in China. Strong local demand could soak up the new capacity before it significantly affects export availability.

3  Export economics. Factors like freight costs, tariffs, qualification expenses, and lead times will determine whether the additional supply from Asia offers a real cost advantage in other regions.

GreenChem Takeaway

This is a medium-term sourcing story, not a reason to change purchasing plans today. The important point is that capacity is being added close to the largest battery-production base in the world. Buyers with multi-year PC requirements should keep Asian capacity additions on their supplier-diversification radar.