China's Massive Battery Capacity Buildout

China’s lead in renewable energy is matched by its dominance in battery storage. According to data from the Energy Institute’s latest Statistical Review of World Energy, the country’s grid-scale battery energy storage capacity surged from just 2.4 gigawatts in 2020 to more than 140 gigawatts in 2025 – far ahead of the United States, which reached roughly 57 gigawatts, and the rest of the world.

This rapid expansion is closely linked to the rise of wind and solar power in the country. Unlike conventional power plants, renewable sources generate electricity intermittently, depending on weather conditions and time of day. Battery storage systems help to smooth out these variations by storing excess electricity and feeding it back into the grid when needed, making large-scale renewable integration more feasible.

In that sense, China’s storage boom is a direct consequence of its clean energy push. As renewable capacity continues to grow, so does the need for flexibility in the power system. By investing heavily in battery storage, China is addressing one of the key challenges of the energy transition, ensuring that its massive buildout of wind and solar power can be used efficiently and reliably.

Policymakers have actively encouraged this development, with many regions requiring new renewable projects to include co-located storage capacity. These measures, combined with falling battery costs and strong domestic manufacturing capabilities, have turned China into the world’s largest market for battery energy storage systems.