Tesla turns to Samsung SDI as Korean batteries power its energy ambitions

Samsung SDI is reportedly in the final stages of negotiations with Tesla to supply around ₩3 trillion (USD 2.1 billion) worth of energy storage system (ESS) battery cells, in what could become one of the most significant partnerships in the global renewable energy supply chain.

According to a report by The Korea Herald, Tesla executives from its ESS division visited Korea last week and reached near-final terms on a multi-year supply contract. The deal is expected to cover about 10 gigawatt-hours (GWh) of lithium-iron-phosphate (LFP) battery cells per year starting as early as 2026, generating between ₩1 trillion and ₩1.5 trillion in annual revenue for Samsung SDI.

Strategic* *s* *hift* *a* *way from* *China* *:

The talks come as the United States continues to push for supply chain diversification under the Inflation Reduction Act (IRA), aiming to reduce dependence on Chinese components in critical sectors such as electric vehicles (EVs) and energy storage. Tesla, once heavily reliant on China’s CATL, has been gradually pivoting toward Korean suppliers for both its EV and ESS lines.

“The reported deal likely involves cell-level supply for Tesla's Megapack assembly lines in California,” said an unnamed industry source quoted in the report. “Tesla is expected to integrate Samsung SDI’s cells into its own Megapack ESS products.”

Production* *p* *lans and* *f* *acility* *c* *onversion :

Samsung SDI is expected to produce the cells at its joint venture plant with Stellantis in Indiana, USA, converting part of its existing EV battery lines into ESS-dedicated production for Tesla and other North American clients.

Unlike its Korean rivals LG Energy Solution (LGES) and SK On, which already operate standalone facilities in the U.S., Samsung SDI has been slower to scale independent American capacity. Its Indiana plant currently operates at less than 50% utilization, largely due to the EV market slowdown.

A successful Tesla deal could reverse that trend, providing the factory with stable utilization and boosting Samsung SDI’s North American footprint.

Competitive korean landscape :

The ESS market has become the next frontier for battery competition among Korean giants. LG Energy Solution signed a contract in July to supply Tesla with 20 GWh of LFP ESS cells per year, and is now negotiating to expand that to 30 GWh.

If both agreements materialize, the combined Korean battery supply to Tesla could reach an estimated 40 GWh annually, meeting nearly 40% of Tesla’s short-term ESS capacity goal.

Tesla aims to scale total annual ESS capacity to 100 GWh within three years, though current output including in-house and partner facilities is still below half that target.

Financial* *b* *oost and* *s* *trategic* *r* *epositioning :

The potential contract could be a lifeline for Samsung SDI, which recently reported a 22.5% year-on-year revenue drop in Q3 2025 to ₩3.5 trillion and an operating loss of ₩591.3 billion amid slowing EV demand. “Securing a major client like Tesla in the fast-growing ESS market marks a significant milestone for Samsung SDI,” said Lee Ho-geun, automotive engineering professor at Daeduk University. “A long-term partnership will strengthen its credibility and expand its full ESS lineup, including the Samsung Battery Box in the U.S. market.”

Tesla’s* *b* *roader* *t* *ech* *r* *oadmap : AI* *c* *hips and* *f* *uture* *i* *ntegration

Tesla CEO Elon Musk recently commented on X about the company’s AI chip roadmap, mentioning collaboration with both TSMC and Samsung for the upcoming AI5 and AI6 chips, expected between 2026 and 2028.

While unrelated directly to the ESS deal, the collaboration highlights Tesla’s growing technical interdependence with Korean suppliers from semiconductors to batteries as it scales its AI, robotics, and energy businesses in parallel.

Market* *i* *mplications and* *e* *xpected* *c* *hallenges :

Industry analysts say that with U.S. tariffs on Chinese components, Korean-made LFP cells could soon reach cost parity or even undercut Chinese alternatives. However, scaling production, maintaining margins amid falling LFP prices, and ensuring IRA compliance remain challenges.

Another concern lies in the ESS market’s cyclicality while global demand for grid-scale storage is soaring, overcapacity and technology standardization could pressure profitability in the medium term.

About the companies :

Samsung SDI is a global leader in high-performance batteries, specializing in EV and ESS solutions. The company is part of South Korea’s Samsung Group and operates production facilities in Korea, Hungary, China, and the United States (via joint ventures).

Tesla, Inc., based in Austin, Texas, is the world’s largest electric vehicle and energy storage manufacturer. Its Megapack products are used for grid-scale renewable storage, with installations across the U.S., Australia, and Europe.

Expected Impact :

If finalized, the Tesla–Samsung SDI contract could redefine the North American ESS supply chain, cementing Korea’s dominance in non-Chinese LFP batteries and providing Tesla with a secure, tariff-compliant energy storage source as it ramps up renewable infrastructure.

Possible* *d* *rawbacks :

• Production conversion costs: Retooling EV lines for ESS production may reduce short-term efficiency.

• Margin pressure: LFP cell prices remain volatile.

• Geopolitical exposure: U.S. regulatory changes could affect subsidy eligibility.

• Overcapacity risk: ESS growth projections could taper if energy projects face delays.