South Korean battery manufacturer Samsung SDI has signed a major supply agreement to provide prismatic energy storage system (ESS) batteries to a US energy company, as demand for grid-scale storage continues to grow in North America.
The company said its US subsidiary, Samsung SDI America, has secured a contract worth around KRW 1.5 trillion (approximately US$1 billion) to supply batteries over a four-year period from 2026 to 2029.
Production for the project will take place at the StarPlus Energy battery plant in Indiana, a joint venture between Samsung SDI and automaker Stellantis.
According to Samsung SDI, the initial phase of the project will use nickel–cobalt–aluminium (NCA) battery chemistry, with later supply expanding to lithium iron phosphate (LFP) batteries manufactured at the Indiana facility.
The agreement marks the latest in a series of large ESS contracts for Samsung SDI in the US market, where demand for stationary energy storage is increasing alongside growth in renewable generation and power consumption linked to artificial intelligence and data centre infrastructure.
In December 2025, the company announced a separate agreement valued at more than KRW 2 trillion to supply LFP cells for energy storage systems to a US energy infrastructure company.
Prismatic-format lithium-ion batteries
Samsung SDI produces prismatic-format lithium-ion batteries for ESS applications, which the company says offer advantages in durability and safety compared with pouch-type cells. The company’s PrismStack battery technology has been developed for large-scale storage systems where reliability and thermal management are key requirements.
