What Is Carbon Emissions Trading (ETS)? How CBAM Hits Exporters' Earnings

Same Tonne of Carbon, 2,000 Won in Korea, Over 100,000 Won in Europe

At a Korea Exchange auction in May 2026, a tonne of carbon allowance cleared at roughly 19,600 won. Around the same time, EU carbon allowances were trading near €80 a tonne — somewhere in the low-six-figure won range once converted. Both markets are selling the exact same thing — the right to emit one tonne of CO2 — yet the price differs by a factor of six or seven. That gap stopped being a trivia fact on January 1, 2026, when the European Union's Carbon Border Adjustment Mechanism (CBAM) entered its definitive phase. CBAM's logic, in plain terms: whatever carbon price a product would have faced had it been made inside the EU, that same price now gets charged at the border when the product is imported instead. The fact that Korea's carbon price sits so far below Europe's isn't just a domestic policy footnote anymore — it's now a direct cost variable for Korean steelmakers exporting into the EU. This lesson covers how carbon trading schemes actually work, why prices differ so much by country, and why CBAM belongs in how you read export-heavy companies' earnings and valuations. It is not a guide to timing carbon-related stocks — it's about the mechanism that reshapes a company's cost structure.

Cap-and-Trade: Fix the Total Amount First, Then Let Companies Trade Within It

The name "emissions trading system" (ETS) puts the emphasis on trading, but the mechanism actually starts one step earlier, with the "cap" — a hard ceiling on total emissions. A regulator, whether a national government or the EU, decides in advance how much CO2 an entire covered sector may emit over a given period. It then distributes that total as allowances — one allowance equals the right to emit one tonne — either handing them out for free or selling them at auction. At the end of each compliance year, every covered company has to surrender allowances matching what it actually emitted. That's where trading becomes necessary. A company that cut emissions below its allocation ends up holding surplus allowances it can sell for cash. A company that emitted more than its allocation has to go buy the shortfall on the open market. That buying and selling is exactly what produces the "carbon price" you see quoted in the news.

The design feature that matters most here is that the cap keeps shrinking over time. Regulators set multi-year "compliance periods" and typically cut the total allowance pool with each new period, which mechanically tightens supply and builds in upward price pressure over the long run. That's also the clearest way to see how an ETS differs from a carbon tax, the other common way to price carbon. A carbon tax fixes the price (the tax rate) up front and lets the resulting emissions reduction float wherever it lands. An ETS does the opposite — it fixes the quantity (the cap) and lets the price float. Because quantity is fixed and price isn't, ETS prices tend to swing with the business cycle, energy prices, and allocation policy changes.

The EU ETS: The World's Largest and Most Expensive Carbon Market

Launched in 2005, the EU ETS is the oldest and highest-priced carbon market in the world. It covers a wide swath of heavy industry — power generation, steel, cement, aviation (intra-EU flights and some routes beyond), and, since 2024, maritime shipping. EUA prices broke above €100 a tonne briefly in February 2023, and through 2025–2026 mostly traded in a roughly €75–95 range (treat any specific number as a snapshot — check a live quote from ICE or EEX before using one for an actual decision). The structural trend that matters most here is the steady phase-down of free allocation. For the sectors covered by CBAM — steel, cement, aluminum, fertilizers, hydrogen, and electricity — free allowances shrink by a set percentage each year starting in 2026, reaching zero by 2034, when those sectors will be buying 100% of their allowances at auction. In other words, EU producers themselves are gradually moving from getting carbon permits for free to paying for all of them, and that shift is precisely what CBAM is designed to mirror at the border.

Korea's K-ETS: A New Fourth Phase in 2026, and a Price That's Drawn Criticism

Korea launched the first national-level ETS in Asia back in 2015, and 2026 marks the start of its fourth compliance period (2026–2030). Around 685 large emitters are currently covered, together accounting for roughly three-quarters of the country's greenhouse gas emissions (the threshold is about 125,000 tonnes a year company-wide, or 25,000 tonnes at a single facility). The persistent criticism of K-ETS has been that its price is too low to actually change behavior. That 19,600-won auction clearing price is only about one-sixth of the comparable EU price. Much of that gap traces back to how heavily free allocation has historically dominated K-ETS — plus, by multiple accounts, sustained industry lobbying from steel-sector associations and business groups that, in past compliance periods, actually pushed total allowances up rather than down. When the price is too cheap, buying your way out with allowances becomes the rational move instead of investing in equipment that actually cuts emissions — which undercuts the whole point of the scheme.

Phase four is an attempt to correct course. The share of paid (auctioned) allocation for the power sector is set to climb toward 50% by 2030, with industrial allocation moving in the same direction more gradually, and a new market-stabilization reserve (K-MSR) will add or pull supply from auctions to smooth out price swings. Export-exposed sectors like steel, however, still keep a higher share of free allocation as a competitiveness buffer. One notable development: starting in November 2025, Korean retail investors gained indirect access to K-ETS allowances through domestic brokerages, a sign that carbon allowances are starting to be treated as an actual investable asset, not just a policy talking point.

CBAM: Charging a Border Price for Carbon That Wasn't Already Paid

If every country prices carbon differently, the EU faces an awkward problem: a European steelmaker paying a high carbon cost at home has to compete against imported steel made somewhere with little or no carbon pricing at all. This is called carbon leakage — production (and the emissions that go with it) simply relocates to wherever regulation is laxer, without actually cutting global emissions; it just moves where they happen. CBAM exists to close that gap. Companies exporting steel, cement, aluminum, fertilizers, hydrogen, or electricity into the EU now have to pay, at the border, a carbon price matching what an EU producer would have paid under the EU ETS for making the same product with the same embedded emissions.

The rollout is staged in a way that's easy to misread. From October 2023 through the end of 2025, the mechanism only required reporting emissions data — no money changed hands. The definitive phase began January 1, 2026, meaning the legal obligation attaches to 2026 imports, but actual certificate purchases and payments lag by roughly a year, starting in 2027 (the first surrender deadline for 2026-year imports is set for around September 30, 2027). On top of that, the charge CBAM levies is discounted in proportion to whatever free allocation EU producers still receive — so the full cost impact only phases in completely once EU free allocation hits zero in 2034. CBAM isn't flipping on at full strength overnight; it's a long transition timed to track the EU ETS's own free-allocation phase-down.

This matters particularly for Korea because of its export mix. Steel is the largest of Korea's five CBAM-covered export categories, historically running above $1.5 billion a year in EU-bound shipments. Korean steelmakers, POSCO prominently among them, have been responding with investments in lower-carbon production methods (such as hydrogen-based direct reduction) and technology partnerships, even as they simultaneously navigate separate U.S. tariff pressure. The exact added cost CBAM imposes varies company by company and product by product, so treat any single aggregate number with caution — the most reliable figure for a specific company is whatever it discloses directly in its own filings or investor materials.

Reading It as an Investor: A Cost for Some, an Asset for Others

Carbon allowances show up in financial statements in a fairly distinctive way. Allowances a company holds are typically booked as an intangible asset. The obligation to cover emissions already incurred is treated as a provision, and — importantly — that provision is remeasured at the current market price of allowances, not frozen at some historical cost. Free allowances received from the government are commonly recorded as deferred income and recognized into earnings gradually over the compliance period rather than all at once. Flip that accounting around and the investor-relevant picture becomes clear: a company that cuts emissions below its allocation is effectively holding a sellable asset, while a company in a carbon-intensive sector — steel, cement, power generation, aviation, shipping — sees rising allowance prices land directly as higher operating costs. A higher carbon price doesn't pull every stock in the same direction; it depends entirely on whether a given company sits on the short side (needs to buy allowances) or the long side (has surplus to sell) of its own allocation. Much like reading currency effects on corporate earnings, carbon exposure only means something once you've identified which side of it a specific company is actually on.

Key Takeaways

• An ETS fixes the total emissions allowed (the cap) and lets companies trade surplus and shortfall allowances within that limit; unlike a carbon tax, which fixes the price, an ETS fixes the quantity and lets the market set the price.
• The EU ETS is the world's oldest and most expensive carbon market, trading roughly in the €75–95 range through 2025–2026, with free allocation for CBAM-covered sectors shrinking annually from 2026 toward full elimination by 2034.
• Korea's K-ETS enters its fourth compliance period in 2026; its price has sat around one-sixth of the EU's, which drew criticism, and the new phase is shifting more allocation toward paid auctions.
• CBAM's definitive phase started in January 2026, but actual payments begin in 2027, and steel is the Korean export sector most directly exposed.
• Rising carbon prices are a cost headwind for carbon-intensive industries and a potential asset gain for companies holding a surplus — the direction depends entirely on which side of its allocation a company sits on.

FAQ

Does a higher carbon price hurt every stock?

No. A company that has cut emissions below its allocation can sell its surplus allowances, which can actually help. Companies in carbon-intensive sectors like steel, cement, or power generation tend to face it as a cost instead. Checking a company's actual exposure matters more than assuming a uniform effect.

Is CBAM essentially a tariff on Korean exports?

Not quite. A tariff taxes the imported product itself. CBAM instead charges a price matching the carbon emitted in making that product — the same price an EU producer would already be paying. Its stated purpose is preventing carbon leakage (production relocating to dodge carbon costs), not raising general import revenue.

Why is Korea's low carbon price considered a problem?

A carbon price only changes behavior if it's expensive enough that cutting actual emissions beats just buying cheap allowances to cover the gap. When the price is too low, buying allowances becomes the cheaper, more rational choice than investing in lower-emission equipment, which weakens the scheme's intended effect.

⚠️ This lesson is for informational and educational purposes only and is not investment advice. Carbon prices and program details change with each new compliance period and policy update, so verify current figures against exchange and government sources before making any investment decision; responsibility for that decision and its outcome rests with the investor.