This article is for informational purposes only and is not financial advice. TheGatBull may earn a commission from some links at no cost to you — see our disclosure and full disclaimer.
The market still files Korea’s battery makers under one word: EVs. And on that chart, they look like a late, money-losing chase. But the real action in 2026 isn’t electric cars — it’s the giant battery boxes parked next to AI data centers. Look there, and the same stocks turn into something else entirely. This is not financial advice.
This is Episode 3 of our series on the AI data center power supply chain — a close-up on link ④, energy storage (ESS).
The short answer: stop pricing them as EV stocks
Approach Korea’s battery trio — LG Energy Solution (KRX: 373220), Samsung SDI (KRX: 006400), and SK On (unlisted, under SK Innovation, KRX: 096770) — with the old “battery = EV” formula and you can’t buy them here. EV demand has hit an air pocket, and the core business is bleeding: LG Energy Solution posted an operating loss of about ₩207.8 billion in Q1 2026, even as revenue rose to roughly ₩6.6 trillion (up 1.2% from the prior quarter, and that figure already includes about ₩189.8 billion of North American production incentives). But put on the ESS and AI-power lens, and the same names re-rate into “the near-only non-China alternative built on US soil.” If you want direct exposure, the purest large-cap is LG Energy Solution; the dark horse in the speed of the pivot is Samsung SDI. Neither escapes one fact: this is a cyclical industry trading on a growth-stock multiple.
Why now — the center of gravity moves from EVs to ESS
In 2026 the picture flipped. EV demand cooled, but the electricity appetite of AI data centers lifted the ESS (energy storage system) market. US data centers used roughly 183 TWh of power in 2024, and the IEA sees that more than doubling to about 426 TWh by 2030. When power becomes the bottleneck, data-center operators and utilities reach for large-scale storage.
Korea’s response has been fast and unsubtle — ppalli-ppalli (hurry-hurry) itself. LG Energy Solution is converting EV lines in the US and Poland to ESS, holding global cell output near 300 GWh in 2026 while raising the ESS share and cutting capex. It aims to exceed 50 GWh of North American ESS capacity by year-end (standalone plants in Holland, Lansing and Windsor, plus JV sites in Tennessee and Ohio). Its North American ESS order backlog stood at about 140 GWh at the end of 2025, with a target of 90 GWh in new ESS orders in 2026 and a stated goal of roughly half the US ESS market.
The decisive scene came in May 2026: the DTE Energy deal in Michigan. LG Energy Solution’s systems-integration arm, LG ES Vertech, will supply 1.5 GW / 6 GWh of storage across eight projects in a roughly $1.6 billion contract, using LFP cells made in the US and Canada (the Holland, Michigan complex). The grid buildout is tied to a newly planned Oracle AI data center in Salem Township — a real-world example of AI power demand converting straight into battery orders. LG’s shares jumped as much as 16% on the announcement.
🎩 Under the Gat — Korea moving into LFP, CATL’s home turf, looks like swallowing its pride. But the real bet isn’t chemistry. It’s who pays a premium for “a battery made on American soil, by non-Chinese hands.” Watch the order backlog and the US regulatory clock — not the EV sales chart.
Meet the players — who does what
- LG Energy Solution (KRX: 373220) — the pivot leader. Korea’s No. 1 and the world’s No. 3 in EV batteries (about 9.2% share in 2025, 108.8 GWh installed). Q1 2026 revenue ~₩6.6 trillion (+1.2% QoQ) but an operating loss of ~₩207.8 billion. 2026 is a reset year: more ESS, less capex. The headline “EV→ESS pivot” stock.
- Samsung SDI (KRX: 006400) — the speed play. It has converted part of its StarPlus Energy line (the Stellantis JV) from EV to ESS, locked a four-year ~₩1.5 trillion ($1 billion) US ESS cell deal through 2029, and an earlier ~₩2 trillion LFP ESS contract. It’s even moving to sell its Samsung Display stake to fund the ESS pivot. Strengths in prismatic, high-energy-density cells; the question is how fast it closes the gap.
- SK On (unlisted / SK Innovation, KRX: 096770). No direct listing. Exposure runs through parent SK Innovation, where refining and E&P dilute the “pure battery” bet.
The anchor for global readers: CATL
There’s essentially no large US-listed pure-play battery stock (Tesla makes for itself; QuantumScape is still a solid-state bet). So the real anchor is China’s CATL, with Japan’s Panasonic as a secondary reference.
| LG Energy Solution (Korea) | CATL (China anchor) | |
|---|---|---|
| Business | EV batteries + a fast ESS pivot; NCM core extending into LFP | Global No. 1 in EV & ESS batteries; the LFP standard-bearer |
| Scale (2025) | ~9.2% global EV-battery share (No. 3) | 39.2% share (No. 1, ninth year running); revenue ~¥423.7B (≈$61.4B) |
| Combined check | LGES 9.2% + Samsung SDI 2.4% + Panasonic 3.7% = ~15.3% | CATL alone (39.2%) > those three combined |
| Moat | US-based production, IRA/tariff umbrella, trusted non-China supply | Overwhelming cost and volume; 50%+ of the LFP market |
| Decisive difference | Policy (de-risking from China) is the moat — nearly the only US-market alternative | Policy (US restrictions) is the risk — constrained US-market access |
Not a perfect parallel — CATL dwarfs Korea on cost and scale (its share alone exceeds the three major Korean and Japanese players combined). But in the vast US market, “being Chinese” is precisely what turns into Korea’s moat.
The mood: remember EcoPro
This section is a device for understanding flows and sentiment. In 2023, Korea had the “EcoPro frenzy.” The donghak gaemi (Korea’s army of retail investors) bought battery-material stocks almost as an article of national faith, and prices ran far ahead of fundamentals before snapping back. Because of that memory, retail investors now hold a split feeling — “batteries = jackpot, or trauma” — while foreigners and institutions stay wary of another valuation overshoot. The same stock is seen through opposite psychologies by retail and foreigners — and that tension is the fuel for volatility.
The risks — what even a bull must concede
- Core losses + subsidy reliance. LG Energy Solution ran an operating loss in Q1 2026, and even its revenue leans on North American production incentives (~₩189.8 billion). Much of the profitability of US-based output rests on policy credits — if policy wobbles, so do margins.
- China’s LFP volume war. A flood of low-cost LFP from CATL presses prices in ESS too. Whether the “non-China premium” fully offsets that price erosion is an open question.
- The EV core keeps sagging. ESS offsets the EV gap; it doesn’t mean EVs can die. If EVs fall further, ESS growth loses its shine.
- Cycle + valuation. At heart this is a cyclical business. If the AI narrative lifts the multiple first, the snap-back is brutal when earnings can’t keep up (the EcoPro lesson).
🎩 Under the Gat — Wall Street calls this an “EV slowdown.” Korea already turned the page — to the data center. Just remember one thing: subsidies are policy, and policy changes. The ESS orders are real, but the true window of this bet runs until those orders become a business that pays without the subsidy.
Footnote — what was the “EcoPro affair”? In 2023, battery-cathode maker EcoPro (KRX: 086520) rocketed more than tenfold from its year-start price on concentrated buying by donghak gaemi retail investors, becoming KOSDAQ’s first “emperor stock” (a share price over ₩1 million) in 16 years. That April, Hana Securities issued a rare “sell” rating with a ₩454,000 target, calling it “a great company whose stock price already over-reflects that greatness”; Goldman Sachs and Morgan Stanley followed with sell views. With retail buying while foreigners and institutions sold or shorted, it was dubbed Korea’s “meme stock.” It peaked that July and then corrected sharply, leaving many retail investors trapped near the top — and a lasting “jackpot-or-trauma” ambivalence that still shadows the flows and sentiment around battery stocks today.
Frequently Asked Questions
How do I get the purest exposure to Korean battery stocks?
The large-cap is LG Energy Solution (KRX: 373220). Samsung SDI (KRX: 006400) is the alternative if you’re betting on the speed of the ESS pivot. SK On is unlisted, so exposure runs through parent SK Innovation (KRX: 096770), which is diluted by its oil-refining business. This is not financial advice.
Why is this an ESS and data-center story, not an EV one?
Because the 2026 growth engine moved from EVs to ESS. AI data-center power demand is pulling the energy-storage market, and Korean makers are catching that demand with US-based production. LG’s $1.6 billion, 6 GWh Michigan deal with DTE Energy — tied to an Oracle AI data center — is the flagship example.
Why not just buy CATL instead?
CATL’s scale and cost are overwhelming — a 39% global share in 2025, larger than the major Korean and Japanese players combined. But its access to the US market is constrained by policy, and the “non-China supply made on US soil” lane is one Korea nearly monopolizes. They are two different bets, not the same one.
What is the biggest risk?
The core business is still losing money and leans on US production subsidies, China’s low-cost LFP keeps pressing prices, and this remains a cyclical industry wearing a growth-stock valuation. If the AI narrative lifts the multiple before earnings follow, the pullback can be sharp — remember EcoPro. Always verify figures against primary sources as of your trade date.
This article is for informational purposes only and is not financial advice. TheGatBull may earn a commission from some links at no cost to you — see our disclosure and full disclaimer.