Samsung SDI Acquires GM's Stake in Indiana Battery Joint Venture

Samsung SDI has acquired General Motors' 49.99% stake in SynergyCells, the battery joint venture the two companies established in New Carlisle, Indiana.

What Happened

The acquisition makes Samsung SDI the sole owner of the Indiana plant, which it describes as its first independently operated battery production base in North America. The deal reflects market changes since the joint venture was announced, including slower-than-expected growth in EV demand, prompting both companies to seek forms of cooperation other than the joint venture. Samsung SDI and GM also signed a new joint development agreement covering prismatic cells for potential future EV applications. The plant remains under construction, with Samsung SDI planning to start producing cells for energy storage systems rather than EVs, citing demand in the US storage market.

Why It Matters

The shift from EV cells to ESS cells reflects broader market recalibrations as automakers and battery suppliers navigate slower-than-anticipated electric vehicle adoption. For buyers and grid operators, the move signals growing manufacturing capacity dedicated to stationary storage, which could support expanding renewable energy deployments. Samsung SDI's three-year contract signed in December 2025—valued at more than 2 trillion won ($1.35 billion)—to supply prismatic LFP cells for ESS starting in 2027 indicates strong commercial backing for the plant's output regardless of EV market conditions.

The Bottom Line

Samsung SDI now fully controls SynergyCells, giving it independent battery manufacturing capability in North America while pivoting initial production toward energy storage amid uncertain EV demand growth.