CATL inks 50 GWh energy storage deal with Sieyuan, secures 20 GWh order for battery cells from CRRC

CATL has partnered with Chinese electrical equipment manufacturer Shanghai Sieyuan Electric under a three-year energy storage cooperation memorandum targeting a cumulative capacity of 50 GW.

Under the agreement, the two companies will leverage their respective strengths to promote a market-oriented dual-procurement model for energy storage, improve industry-chain collaboration efficiency, and support the high-quality development of China’s energy storage sector, CATL said in a press release issued on December 25.

Over the next three years, CATL and Sieyuan will coordinate full supply chains covering energy storage systems and supporting equipment such as transmission and distribution gear. The partnership will also strengthen technical exchange and joint project development aimed at accelerating the large-scale deployment of energy storage systems in new-type power networks.

Sieyuan and CATL first established their partnership in 2022, and the latest agreement deepens their collaboration while strengthening synergies across the energy storage value chain.

While significant in scale, the deal follows even larger supply agreements signed by CATL in recent months. In November, the company announced a 10-year cooperation framework with Chinese energy storage system integrator HyperStrong, under which CATL committed to supplying at least 200 GWh of energy storage batteries between 2026 and 2028.

Separately, Chinese rail and power equipment group CRRC has placed a direct 20 GWh procurement order for battery storage cells from CATL. The order covers two cell formats: 314 Ah and 587 Ah lithium iron phosphate (LFP) batteries. Specifically, the contract includes 8 million 314 Ah, 3.2 V cells, totaling approximately 8 GWh, and 6.4 million 587 Ah, 3.2 V LFP cells, with a combined capacity of around 12 GWh.

CATL unveiled its next-generation 587 Ah cell in April 2025 and brought the product into large-scale commercialization, with shipments projected to have reached 3 GWh by the year’s end.

Previously, CRRC secured an even larger long-term agreement with Hithium, which committed to supplying at least 120 GWh of battery energy storage products between 2026 and 2030. The agreement, signed on December 5, 2025, covers a portfolio of lithium iron phosphate cells, including 314 Ah, ∞Cell 587 Ah, and ∞Cell 1175 Ah products.