After a prolonged slump, South Korea's secondary battery sector is showing signs of a major turnaround, driven by surging demand for Energy Storage Systems (ESS). Key players EcoPro BM, LG Energy Solution, and Samsung SDI are expected to benefit from accelerating ESS deployments, fueled by rising electricity demand from AI data centers and global renewable energy expansion.
According to recent market analyses, the ESS segment is emerging as a new growth engine for battery makers, offsetting weaker electric vehicle (EV) demand. EcoPro BM, a leading cathode material producer, is poised to capitalize on ESS orders as utilities and tech companies seek grid-scale storage solutions. LG Energy Solution, the country's largest battery maker, is ramping up ESS production lines to meet orders from North America and Europe. Samsung SDI, known for its high-nickel battery technology, is also expanding its ESS portfolio to capture market share.
Industry experts note that government policies in the U.S. and Europe mandating energy storage alongside solar and wind projects are creating a multi-billion-dollar market. In South Korea, the government's push to build large-scale ESS facilities to stabilize the power grid is further supporting demand.
"ESS is the hidden gem in the battery sector," said an analyst from a local brokerage. "As AI data centers consume more power, the need for reliable storage solutions will only intensify."
Despite recent volatility, battery stocks have gained momentum this quarter. EcoPro BM shares rose 12% in the past month, while LG Energy Solution and Samsung SDI posted gains of 8% and 10%, respectively. Investors are now watching for second-half earnings, expecting ESS-related revenue to lift profits.
The turnaround narrative is also supported by supply chain diversification efforts. EcoPro BM's new plant in Hungary and Samsung SDI's joint venture with Stellantis for EV batteries are seen as long-term growth drivers.
While the EV market remains challenging due to price competition from Chinese rivals, the ESS boom offers a lifeline. The question is whether this momentum can sustain into 2026.