Despite a slowdown in demand for electric vehicles (EV) that has complicated efforts to localize lithium battery production in the US — and even cast doubt on the viability of some joint ventures between automakers and battery makers — another opportunity is rapidly coming into view.
American industry executives say that a surge in demand for energy storage has left domestically produced lithium battery cells in short supply, turning the sector into a rare bright spot for battery manufacturers navigating an EV downturn.
Supply chain companies note that state governments and utilities across the US continue to offer generous subsidies for energy storage systems. Compared with the cooling effect of reduced federal incentives for EVs, the growth prospects for batteries in energy storage appear far more resilient.
At the same time, soaring electricity demand driven by artificial intelligence data centers has elevated the importance of storage systems capable of balancing grids and smoothing peak loads, making them indispensable to the country's energy infrastructure.
Geopolitics has further tightened the market. Restrictions on imports of Chinese-made battery cells, along with persistent scrutiny of China-linked manufacturing operations in the US, have increased both the scarcity and the pricing power of domestically produced cells.
The chill in the US EV market has already inflicted short-term financial strain on major South Korean battery makers, including LG Energy Solution, SK On, and Samsung SDI. Yet the rise of the American energy storage market is offering those companies an unexpected opening, a chance to accelerate their development of lithium iron phosphate, or LFP, batteries.
For years, South Korean manufacturers have focused on nickel-rich batteries, prized for their higher energy density and longer driving range. But such batteries are increasingly being pushed toward mid- and high-end EVs, while lower-cost LFP batteries are rapidly dominating entry-level cars and the energy storage sector.
Chinese manufacturers, backed by the world's largest EV market at home, have leveraged their scale and technological maturity in LFP to capture significant global market share in recent years, crowding out competitors from South Korea and Japan.
Safety perceptions have also played a role. Several high-profile fires involving large-scale energy storage systems were widely associated with nickel-based batteries, reinforcing LFP's appeal in the sector — even though industry experts caution that such incidents do not point to a simple causal link, and LFP systems have also experienced fires.
Recognizing the need for a broader product portfolio, South Korean firms have long acknowledged the importance of expanding into LFP. But their progress has lagged, in part because of cost competition from Chinese rivals.
Now, US policy favoring domestic supply chains is giving those companies a buffer: a window to build local capacity, refine LFP technology, and achieve economies of scale under a measure of geopolitical protection.
That shift is helping to offset the impact of slowing EV sales, while positioning South Korean manufacturers to compete more effectively with Chinese rivals as the US energy storage market expands.
In 2026, the battleground for lithium batteries in the US is no longer defined by how far a vehicle can travel on a charge, but by how much energy can be stored. As Korean technology converges with the advantages of American manufacturing, the energy storage market is emerging as a decisive testing ground for the next phase of battery dominance.
The opportunity is not limited to Korean firms. Japanese, European, and Taiwanese companies are also moving aggressively into the American energy storage market, setting the stage for a broader global competition.
Article translated by Elaine Chen and edited by Jack Wu
