Quick Answer: What Is the EU ETS and Why Does It Matter?
The EU Emissions Trading System is the world's first and largest compliance carbon market. Launched in 2005, it forces power plants, factories, airlines, and — since 2024 — shipping companies to pay for every tonne of CO2 they release. The mechanism is straightforward: the EU sets a cap on total allowable emissions, distributes or auctions allowances up to that cap, and lets companies trade them. If you emit more than your allowances cover, you buy extra on the market. If you emit less, you sell the surplus.
That cap shrinks every year, which is the whole point. Fewer allowances means higher prices, and higher prices mean it becomes cheaper to decarbonise than to keep polluting. Right now, EU Allowances (EUAs) trade between €60 and €80 per tonne — a price range that's already reshaping investment decisions across European industry.
Use our Business carbon footprint calculator to see how EU carbon costs might affect your operations.
How Cap-and-Trade Actually Works
Think of the EU ETS as a slowly closing valve on Europe's emissions pipe. Each year, the EU issues fewer emission allowances — each one representing the right to emit one tonne of CO2 equivalent. Companies get these allowances through two main channels:
- Auctioning — Most allowances are now sold at auction, generating revenue that EU member states reinvest in climate projects.
- Free allocation — Sectors at risk of "carbon leakage" (losing competitiveness to countries without carbon pricing) still receive some allowances for free, though the share is declining.
Once companies hold their allowances, they can trade them freely on exchanges like ICE Endex or EEX. A steel mill that invests in efficiency and cuts emissions below its allocation can sell surplus allowances for profit. A power plant burning more fossil fuel than expected has to buy extra at market price.
The penalty for non-compliance is steep: €100 per tonne on top of the obligation to surrender the missing allowances. Nobody wants to be short.
EU ETS Phases: How the System Has Evolved
The EU ETS didn't start out this effective. Early phases were plagued by over-allocation and rock-bottom prices. Here's how each phase tightened the screws:
| Phase | Period | Key Changes |
|---|---|---|
| Phase 1 | 2005–2007 | Pilot period. Generous free allocations led to price collapse (~€0 by end). |
| Phase 2 | 2008–2012 | Aligned with Kyoto Protocol. Financial crisis crashed demand; prices fell below €10. |
| Phase 3 | 2013–2020 | EU-wide cap replaced national caps. Auctioning became default. Market Stability Reserve introduced in 2019 to absorb surplus. |
| Phase 4 | 2021–2030 | Annual cap reduction increased to 4.3% from 2024. Free allocations phased down. Aviation and maritime fully included. |
Phase 4 is where the system gets real teeth. The faster cap reduction, combined with the Market Stability Reserve automatically pulling excess allowances out of circulation, creates genuine scarcity. That's why prices jumped from under €30 in 2020 to nearly €100 by early 2023.
Key takeaway: The EU ETS covers roughly 40% of EU emissions and is entering its strictest phase yet — Phase 4 cuts the emissions cap by 4.3% annually from 2024, pushing allowance scarcity higher.
What Drives the EU ETS Carbon Price?
EUA prices don't move in a straight line. Several forces push and pull:
- Energy prices — When natural gas is expensive, utilities burn more coal, increasing emissions and demand for allowances. When gas is cheap, the reverse happens.
- Economic activity — A recession reduces industrial output and emissions, softening demand for allowances. Recovery does the opposite.
- Policy signals — Announcements about faster cap reductions or expanded scope tend to push prices up as traders anticipate tighter supply.
- Weather — Cold winters increase heating demand; dry summers reduce hydropower and increase fossil generation.
- Market Stability Reserve — This automated mechanism absorbs surplus allowances when the total in circulation exceeds a threshold, preventing the price collapses that plagued earlier phases.
In 2023, EUA prices touched €100 before settling back. Through 2024 and into 2025, they've hovered in the €60–80 range — still high enough to make low-carbon investments attractive, but below the peaks that spooked some industries.
Track your organisation's emissions against these benchmarks with our carbon price tracker.
CBAM: Carbon Costs Now Follow Goods Across Borders
The Carbon Border Adjustment Mechanism is the EU's answer to a fundamental problem: if European factories pay for carbon but their foreign competitors don't, production simply moves overseas. That's carbon leakage — emissions don't disappear, they just relocate.
CBAM fixes this by requiring importers to purchase CBAM certificates reflecting the carbon embedded in their goods. The timeline:
- October 2023 – December 2025: Transitional period. Importers report the embedded emissions in their goods but don't pay yet.
- January 2026: Financial obligations begin. Importers must purchase CBAM certificates, priced at the quarterly average of EU ETS auction prices.
- 2027 onwards: Certificate prices shift to weekly EU ETS auction averages. Free allocations for EU producers in CBAM sectors phase out completely by 2034.
CBAM currently covers six product categories: steel, cement, aluminium, fertilizers, electricity, and hydrogen. The EU is evaluating expansion to other goods.
If an importer can demonstrate that a carbon price was already paid in the country of origin, they can deduct that amount from their CBAM obligation. This creates a powerful incentive for non-EU countries to implement their own carbon pricing.
Worked Example: A Steel Importer's CBAM Obligation
Let's walk through a realistic scenario. Suppose a German distributor imports 5,000 tonnes of hot-rolled steel from a mill in Turkey.
Step 1: Determine embedded emissions.
The Turkish mill reports its specific emission intensity: 1.8 tonnes CO2 per tonne of steel produced. (If no verified data is available, the EU assigns default values — typically set at the worst-performing 10% of EU producers.)
Embedded emissions = 5,000 × 1.8 = 9,000 tonnes CO2
Step 2: Check for carbon price already paid.
Turkey has a developing emissions trading scheme, but let's assume no effective carbon price was applied to this production. Deduction = €0.
Step 3: Calculate CBAM cost.
In Q1 2026, the quarterly average EU ETS auction price is €72 per tonne.
CBAM cost = 9,000 × €72 = €648,000
Step 4: Acquire certificates.
The importer must purchase 9,000 CBAM certificates through the EU's CBAM registry before the annual surrender deadline. Certificates can be bought in advance and surrendered at the end of the year, with up to one-third re-sold back to the registry if purchased in excess.
That €648,000 cost changes the equation dramatically. It might make sourcing from a cleaner EU mill — or a Turkish mill that invests in decarbonisation — more competitive than it was before.
Use our Energy calculator to model how energy-intensive imports affect your carbon exposure.
Key takeaway: CBAM financially kicks in from January 2026 for importers of steel, cement, aluminium, fertilizers, electricity, and hydrogen — meaning carbon costs now follow goods across borders.
ETS 2: Expanding to Buildings and Road Transport
Starting in 2027, a separate system — ETS 2 — will cover emissions from buildings and road transport fuel. This is politically sensitive because it directly affects household energy and petrol costs.
To cushion the impact, the EU created the Social Climate Fund, worth €86.7 billion, to support vulnerable households, micro-enterprises, and transport users during the transition. Member states must submit Social Climate Plans showing how they'll use the funds.
ETS 2 won't overlap with the existing ETS. It operates upstream, targeting fuel suppliers rather than individual households. But it means that by 2027, roughly 75% of EU emissions will be covered by some form of carbon pricing — up from 40% today.
Explore carbon reduction strategies with our offset projects to lower exposure before these changes hit.
What This Means for Businesses and Individuals
If you run a business in the EU or trade with it, the direction is unmistakable: carbon is becoming more expensive, and the coverage is expanding. Here's what to act on:
- Direct ETS participants: Budget for annual cap reductions. Every year, fewer free allowances means higher costs unless you cut emissions. Investing in efficiency, fuel switching, or electrification pays back faster as EUA prices hold above €60.
- Importers: Get ahead of CBAM. The transitional reporting period is your chance to map supply chain emissions, request verified data from suppliers, and identify lower-carbon alternatives before financial obligations start.
- SMEs and individuals: You won't buy EUAs directly, but carbon costs flow downstream through electricity prices, heating bills, and product prices. Understanding the system helps you anticipate cost shifts and make informed decisions.
Start by benchmarking your current footprint with our Your footprint calculator — you can't reduce what you don't measure. Then explore our carbon footprint calculators to break emissions down by sector and find the areas where cuts deliver the biggest savings.
The EU ETS isn't just a policy instrument — it's a price signal that's reshaping Europe's economy. Companies that treat it as a compliance headache will keep paying more. Those that treat it as a roadmap will find opportunities their competitors miss.