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v1.2Last reviewed June 2026

EU ETS Allowance Methodology — Compliance Obligation and Calculation Approach

EU ETS allowance methodology — two ways to obtain allowances. Free allocation, around 500 million EUA in 2024, is benchmark-based for carbon-leakage sectors and declining; the rest is bought by auctioning at the 2024 average price of 64.76 euros per tonne, the default for power since Phase 3. Surrender one allowance per verified tonne; linear reduction 4.4 percent per year; excess-emissions penalty 100 euros per tonne.
MasterBrain v2026.284 · updated 6 Nov 2026

Every operator inside the EU Emissions Trading System ends each year with one arithmetic to settle: verified emissions against allowances held. The difference is either a surplus to bank or a deficit to cover — and from 2024 the cap that sets it tightens 4.2% every year.

The number you surrender is not a market view; it is a regulatory obligation, and missing it costs €100 per tonne plus the allowances you still owe.

Quick Answer

EU ETS allowances to surrender = verified annual emissions (tCO₂e), settled against allowances held (free allocation + purchased). Surplus allowances bank forward; a deficit must be bought before the surrender deadline.

Carbon Markets · 15 min read

Step-by-step method for calculating an operator’s compliance obligation under the EU Emissions Trading System (EU ETS). Covers coverage thresholds and the four trading phases, the declining cap and linear reduction factor, the Market Stability Reserve, free allocation versus auctioning, the annual verified-emissions-to-surrender calculation, the compliance calendar and excess-emissions penalty, and the interlock with CBAM and CSRD. Numeric figures from EEA Report ETC CM 2025/06; framework per Directive 2003/87/EC as amended by Directive (EU) 2023/959.

This is a compliance-calculation methodology, not trading or investment advice

This page explains how to calculate the allowances an operator must surrender against verified emissions, and how the cap, free allocation, and Market Stability Reserve are set. The historical EU allowance (EUA) prices shown are a factual record from the EEA, not forecasts. Nothing here is investment, trading, or financial advice — decisions to buy, sell, or hedge allowances are commercial choices for which you should take independent professional advice.

A methodology page is the execution layer — it takes the unit of account from the glossary, the rules from the Directive, and the verified-emissions figure from your monitored inventory, and tells you exactly how to translate them into an annual surrender obligation. If your coverage is already confirmed, jump to the surrender calculation or the worked examples.

Pre-check — is your activity covered by the EU ETS?

The EU ETS covers large stationary installations, aviation, and (from 2024) maritime transport, with a separate emissions trading system (ETS-2) starting for buildings and road transport fuels. Coverage is defined by activity and capacity thresholds in Annex I of the Directive. Confirm which system applies before building any obligation.

Stationary installations
Covered (the original ETS-1). Power and heat generation, energy-intensive industry — refineries, steel, cement, lime, glass, ceramics, pulp & paper, bulk chemicals, etc. — above the Annex I capacity thresholds. This methodology’s core path.
Aviation
Covered since 2012. Flights within the EEA. Aviation allowances and free allocation follow a separate sub-regime; intercontinental flights are addressed via CORSIA. See the aviation note in Step 4.
Maritime transport
Covered from 2024. Ships ≥ 5,000 GT. Phased in: 40% of 2024 emissions surrendered in 2025, 70% for 2026, 100% from 2027. Coverage is 100% of intra-EU voyages plus 50% of extra-EU voyages.
Buildings & road transport fuels
ETS-2 — separate system, from 2027 (scheduled; possible postponement to 2028). Upstream coverage on fuel suppliers, not end users. Distinct cap and allowances from ETS-1.
Below threshold / not listed
Not covered. Installations below the Annex I capacity thresholds, or activities not listed, have no EU ETS surrender obligation — though they may fall under national measures or ETS-2 upstream pricing.

Two channels for allowances — free allocation and auctioning

Allowances reach operators two ways, and most covered installations receive a mix. Auctioning is the default method in Phase 4; free allocation is a declining carve-out for sectors at risk of carbon leakage, calculated against product benchmarks. Both produce EU allowances (EUA) that count identically toward the surrender obligation — the difference is whether you received them at no cost or bought them.

Free allocation

Benchmark-based, declining, leakage-exposed sectors

Granted to industrial installations in carbon-leakage-exposed sectors, calculated from EU-wide product benchmarks × activity level. Total free allocation was around 500 million EUA in 2024 (−7% versus 2023). The free share is being withdrawn over time, and for CBAM sectors it phases out fully by 2034 — the withdrawal that the CBAM obligation mirrors.

Auctioning

The default method in Phase 4

The majority of allowances are auctioned. The power sector receives essentially no free allocation and buys at auction; auction revenue flows to Member States and to funds including the Innovation and Modernisation Funds and, for ETS-2, the Social Climate Fund. Auction supply is adjusted by the Market Stability Reserve.

When to Use This Methodology

✓ Use this methodology when
  • You operate a stationary installation, aircraft, or ship covered by the EU ETS and need to calculate your annual surrender obligation
  • You are reconciling verified emissions against free allocation and purchased allowances to find your net position
  • You are forecasting how the declining cap and free-allocation phase-down change your obligation year on year
  • You are aligning an EU ETS position with a CBAM obligation or a CSRD ESRS E1 disclosure
✗ Do not use this methodology when
  • Your installation is below the Annex I thresholds — there is no surrender obligation
  • You are calculating a corporate GHG inventory under the GHG Protocol — EU ETS allowances are a market instrument and sit outside the GHG Protocol scopes; do not net allowances against your Scope 1 total
  • You need a price forecast or a hedging strategy — this page covers the compliance calculation, not market views
  • You are an importer of CBAM goods — use the EU CBAM methodology instead; CBAM is the import-side mirror, not the ETS itself
Allowances are a market instrument — not a reduction in your inventory

EU ETS rows are classified as market-structure values sitting outside the GHG Protocol scopes. Your verified ETS emissions are real Scope 1 emissions and belong in your inventory; the allowances you surrender against them are a separate compliance instrument and must never be subtracted from your reported Scope 1 total. Surrendering allowances discharges a legal obligation — it does not reduce the tonnes you emitted. Keep the two ledgers distinct.

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Step 1 — Confirm Coverage (Sectors, Thresholds, Phases)

The EU ETS has run in distinct trading phases since 2005, each tightening the rules. Knowing the current phase matters because the cap trajectory, free-allocation rules, and scope all changed at phase boundaries.

The four trading phases (and the fifth in design)

Phase Years Defining features
Phase 1 Past 2005–2007 Trial / learning-by-doing. Over-allocation; price peaked near €30 then collapsed to ~€0 as Phase 1 allowances could not bank into Phase 2.
Phase 2 Past 2008–2012 Tighter caps; aviation brought in from 2012. Financial-crisis demand drop left a large surplus that depressed prices.
Phase 3 Past 2013–2020 Auctioning became the default allocation method (≈60% of allowances auctioned in 2013, rising); EU-wide cap; linear reduction factor 2.2%/yr; Market Stability Reserve established (operational from 2019).
Phase 4 Current 2021–2030 Linear reduction factor raised to 4.2%/yr with one-off cap rebasings in 2024 and 2026; maritime added from 2024; tighter benchmark-based free allocation linked to the CBAM phase-down. “Fit for 55” revision via Directive (EU) 2023/959.
Phase 5 Future 2031–2040 Design pending. This is the window in which the CBAM free-allocation phase-out completes (2034).

Scope expansions — maritime, aviation, ETS-2

Phase 4 widened the system materially. Maritime transport entered in 2024 for ships of 5,000 gross tonnes and above, phased in over three years: 40% of 2024 emissions surrendered in 2025, 70% for 2026, and 100% from 2027 onward. Maritime coverage applies to 100% of intra-EU voyages and 50% of voyages to or from a non-EU port.

Aviation has been in the system since 2012 for flights within the European Economic Area. A separate emissions trading system, ETS-2, covering fuels used in buildings and road transport, is scheduled to start in 2027 (with a possible postponement to 2028). ETS-2 prices emissions upstream at the fuel-supplier level and runs on its own cap and allowances, distinct from the ETS-1 covered here, with revenue supporting the Social Climate Fund.

Linking: Switzerland in, the UK out

The Swiss ETS has been linked to the EU ETS since 22 September 2020, with mutual recognition of allowances between the two systems. The UK left the EU ETS after Brexit and runs a separate UK ETS from 2021 — there is no linking, UK allowances (UKAs) are not interchangeable with EUAs, and the two carbon prices move independently. Treat a UK installation under the UK ETS, not this methodology.

Step 2 — The Cap, the Linear Reduction Factor & the MSR

The cap is the total quantity of allowances issued each year across the whole system. It declines on a fixed trajectory set by the linear reduction factor (LRF), and the floating surplus is managed by the Market Stability Reserve. Together these set how scarce allowances are — and therefore the backdrop against which every operator’s obligation is settled.

How the cap declines — the linear reduction factor

In Phase 3 the cap fell by a linear reduction factor of 2.2% of a fixed baseline each year. Phase 4 raised the LRF to 4.2% per year, and the “Fit for 55” revision added two one-off downward rebasings of the cap, in 2024 and 2026, to align the trajectory with the EU’s 2030 target. The practical effect: total allowances available shrink faster than before, tightening the market every year independent of any individual operator’s actions.

The Market Stability Reserve and the surplus

The Market Stability Reserve (MSR), established under Decision (EU) 2015/1814 and operational from 2019, manages the structural surplus of allowances that built up after the financial crisis — a surplus that reached roughly 2.1 billion allowances. It works off the Total Number of Allowances in Circulation (TNAC), published annually:

MSR parameter Threshold / rule
Upper TNAC threshold 833 million allowances — above this, allowances are withdrawn from auctions into the reserve (intake rate 24%; reverting to 12% after 2023)
Lower TNAC threshold 400 million allowances — below this, 100 million allowances are released from the reserve back into auctions
Holdings cap Allowances held in the reserve above 400 million are no longer valid (invalidation / cancellation mechanism)
TNAC end-2024 1,150 million allowances (1.15 billion) — above the upper threshold, so intake continued
The MSR has already cancelled hundreds of millions of allowances

The holdings cap is not theoretical. The reserve held 671 million allowances at the end of 2023; of these, 271 million were cancelled in 2024 because they exceeded the validity cap, and the 2024 intake from auctions was a further 271 million allowances. This steady withdrawal and cancellation is the mechanism converting the historical surplus into genuine scarcity — and is a structural reason the supply backdrop tightens over Phase 4.

Step 3 — How You Receive Allowances — Free Allocation vs Auctioning

Most operators receive a mix of free allocation and purchased allowances. The free portion is benchmark-based and declining; the rest is bought, primarily at auction.

Industrial installation in a carbon-leakage sector Steel, cement, chemicals, etc.
Free allocation = product benchmark × activity level × applicable factors. Benchmarks are EU-wide, tightened over Phase 4. Total free allocation was around 500 million EUA in 2024 (−7% versus 2023). The free share declines over time.
Installation in a CBAM sector Iron & steel, cement, fertilisers, aluminium, hydrogen
Free allocation phases out as the CBAM obligation phases in — the same proportion, withdrawn fully by 2034. EU producers lose free allocation at exactly the rate importers gain a CBAM charge, keeping the two on a level footing.
Power generator Electricity production
Essentially no free allocation — buy the full obligation at auction. The power sector has been the default full-auctioning sector since Phase 3.
Any shortfall after free allocation Verified emissions > free allowances
Purchase the balance — at auction or on the secondary market — before the surrender deadline. A surplus instead (free allocation > emissions) can be banked forward indefinitely within Phase 4.

EU allowance price — selected reference years

EUA prices are set by the market, not the Directive. The series below shows the annual average secondary-market EUA price for the years the EEA reports as reference points — these are discrete published years, not a continuous run, so no value is implied for the years between them.

Selected-year series — annual average secondary EUA price, EEA Report ETC CM 2025/06. Years 2014–2016 and 2020 are not reference points in the source and are intentionally omitted; do not interpolate a value for them. 2022 figure is the annual average; the intraday/period maximum that year was €97.51/t. Prices are a historical record, not a forecast.

Step 4 — Calculate Your Annual Surrender Obligation

The compliance obligation is an identity, not a model: you must surrender one allowance for every verified tonne of CO₂e you emitted in the year. The only question is how many you must buy — which is your verified emissions minus the allowances you already hold for free.

NetPosition = FreeAlloc − VerifiedEmissions
VerifiedEmissions Annual emissions monitored under the MRV rules and confirmed by an accredited verifier (tCO₂e)
FreeAlloc Allowances received free for the year (benchmark × activity level), zero for full-auctioning sectors
NetPosition > 0 Surplus — free allocation exceeds emissions; surplus allowances can be banked forward
NetPosition < 0 Deficit — must purchase the shortfall before the surrender deadline
Allowances surrendered Always equals VerifiedEmissions (one allowance per tonne), regardless of how they were sourced

The number of allowances you surrender always equals your verified emissions. The net position only tells you whether you cover that surrender from free allocation alone (surplus) or must buy the difference (deficit).

Worked examples

Three calculations on a single covered industrial installation, IND-EU Werke (fictional). The first two share the same emissions but different free-allocation levels — one ends in surplus, one in deficit. The third is the aviation case, which is qualitative because aviation-specific allocation factors are framework rules, not numeric factors in the GreenCalculus data layer. Cost illustrations use the 2024 average EUA price (€64.76/t); they are indicative, not price forecasts.

Example 1 Installation in surplus — free allocation exceeds emissions Phase 4
Your compliance year
IND-EU Werke — covered industrial installation, reporting year 2024
Verified emissions: 180,000 tCO₂e  |  Free allocation: 200,000 EUA
Allowances held before purchase: 200,000 (all free) Carbon-leakage sector; benchmark-based free allocation. Illustrative cost basis: 2024 avg EUA €64.76/t (EEA ETC CM 2025/06).
Net position
Free allocation200,000 EUA
− Verified emissions− 180,000 tCO₂e
= Net position+ 20,000 EUA surplus
+20,000 EUA
surplus · bankable forward
Surrender
Must surrender180,000 EUA
Held (free)200,000 EUA
To purchase0 EUA
€0 to buy
covered by free allocation
Surrenders 180,000 allowances, banks the 20,000 surplus. No purchase required this year — but as the LRF and benchmark tightening reduce free allocation, the surplus narrows toward zero in future years.
Banking is allowed within Phase 4: surplus allowances do not expire at year-end and can cover a future deficit. This is why an installation’s multi-year position matters more than any single year.
Example 2 Installation in deficit — must purchase the shortfall Phase 4
Your compliance year
IND-EU Werke — same installation, a later year after benchmark tightening
Verified emissions: 180,000 tCO₂e  |  Free allocation: 140,000 EUA
Banked surplus carried in: 20,000 EUA (from Example 1) Free allocation fell as Phase 4 benchmarks and the CBAM phase-down reduced the free share. Illustrative cost: 2024 avg EUA €64.76/t.
Net position
Free allocation140,000 EUA
+ Banked surplus+ 20,000 EUA
− Verified emissions− 180,000 tCO₂e
= Shortfall− 20,000 EUA
−20,000 EUA
deficit · must purchase
Cost to cover
To purchase20,000 EUA
× 2024 avg price× €64.76/t
Indicative cost≈ €1,295,200
≈ €1.30M
indicative · at 2024 avg price
Same 180,000 tCO₂e emitted, same 180,000 allowances surrendered — but the 60,000 EUA drop in free allocation, only partly offset by the banked surplus, turns a €0 year into a ~€1.3M purchase.
The lever an operator actually controls is verified emissions. Cutting emissions reduces both the surrender quantity and the purchase requirement; the free-allocation decline is set by policy and is not within the operator’s control.
Example 3 Aviation operator — qualitative (framework rules, not numeric factors) Since 2012
Your compliance year
EEA-based aircraft operator — intra-EEA flights
Verified flight emissions: monitored per the aviation MRV rules
Allowances: aviation free allocation + purchased EUA Aviation has been covered since 2012. GreenCalculus holds aviation as a framework inclusion only — no aviation-specific allocation factors — so the numbers here are stated as Directive-defined rules, not data-layer values.
How it works
Surrender rule1 EUA per tCO₂e
Free allocationaviation sub-regime
Scopeflights within the EEA
same identity
verified emissions = allowances surrendered
What differs
Allocationseparate aviation rules
Intercontinentalvia CORSIA
Free phase-downaviation free allocation declining
sub-regime
same core surrender identity
The core identity is unchanged — verified emissions determine allowances surrendered. Only the allocation rules and the geographic scope differ, and aviation free allocation is itself being phased down.
Aviation figures on this page are stated as Directive-defined framework rules rather than data-layer factors, because the GreenCalculus data layer carries aviation only as an inclusion year (2012), not as aviation-specific allocation factors. Confirm aviation allocation against the current consolidated Directive before relying on it.

Step 5 — The Compliance Calendar & Penalties

The obligation runs on a fixed annual cycle: monitor, report, verify, surrender. The dates below follow the standard EU ETS compliance rhythm; confirm the exact deadlines for your Member State and compliance year, as some dates have shifted under the revised Directive.

Through the year
Monitor (MRV)Emissions monitored continuously under the approved monitoring plan and the Monitoring & Reporting Regulation.
Early in year N+1
VerifyThe prior year’s annual emissions report is checked by an accredited independent verifier.
By the report deadline
Report verified emissionsThe verified emissions figure is submitted to the competent authority and entered in the Union Registry.
By the surrender deadline
Surrender allowancesAllowances equal to verified emissions are surrendered through the Union Registry. Any deficit must already have been purchased.
The excess-emissions penalty does not discharge the obligation

Failing to surrender enough allowances triggers an excess-emissions penalty of €100 per tonne of CO₂e not covered (index-linked to EU inflation since 2013). Critically, paying the penalty does not release you from the surrender obligation — you must still surrender the missing allowances in addition to paying the penalty, and the operator’s name is published. The penalty is a sanction on top of the obligation, not a price cap or an alternative to compliance.

An interactive EU ETS allowance calculator — net position, free-allocation phase-down projection, and penalty exposure — is on the GreenCalculus roadmap. Until it ships, the worked examples above show the net-position calculation by hand.

EU ETS, CBAM & CSRD — How They Interlock

The EU ETS does not operate in isolation. Two adjacent regimes lean on it directly: CBAM borrows its price and mirrors its free-allocation phase-down, and CSRD requires its figures to be disclosed.

Regime What it does How it touches the EU ETS
EU ETS Caps and prices emissions from covered EU installations, aviation, and shipping The reference system — sets the EUA price and the free-allocation trajectory
CBAM Prices embedded emissions of imported goods to prevent carbon leakage CBAM certificate price tracks the EUA price; the CBAM charge phases in as EU ETS free allocation phases out, completing by 2034
CSRD ESRS E1 Mandatory EU corporate climate disclosure ESRS E1 requires disclosure of EU ETS allowances held and the carbon price exposure; the figures feed the climate-risk narrative

The clean mental model: the EU ETS prices EU-produced carbon, CBAM prices imported carbon at the same rate, and the free-allocation phase-down is the dial that hands coverage from one to the other — reaching full CBAM coverage and zero CBAM-sector free allocation in 2034. CSRD ESRS E1 then requires both exposures to be disclosed. An EUA price move ripples through all three.

What a Calculator Handles vs What You Decide

A calculator automates the net-position arithmetic and the projection. The judgements that set the inputs — coverage, benchmark, banking strategy — are yours.

⚙ A calculator handles automatically
  • Net position: free allocation + banked surplus − verified emissions
  • Allowances to surrender (= verified emissions) and allowances to purchase (the deficit)
  • Indicative purchase cost at a chosen EUA price
  • Multi-year projection as the LRF (4.2%/yr) and benchmark tightening reduce free allocation
  • CBAM-sector free-allocation phase-down toward the 2034 endpoint
  • Excess-emissions penalty exposure (€100/t on any shortfall)
✎ You must decide before using a calculator
  • Coverage: are you ETS-1 stationary, aviation, maritime, or ETS-2?
  • Verified emissions: is the figure MRV-monitored and verifier-confirmed?
  • Free allocation: which product benchmark and activity level apply?
  • Banking: do you carry a surplus forward or buy now?
  • Price assumption: which EUA price to model — and remember it is an assumption, not a forecast from this site
  • CBAM-sector status: is your free allocation subject to the phase-down?

Error Traps — With Calculable Consequences

Error What happens Consequence How to avoid
Surrendering net of free allocation, not gross emissions Operator surrenders only the deficit (emissions − free), forgetting that the full verified emissions must be surrendered. Under-surrender → €100/t penalty
On a 20,000 t gap that is €2.0M in penalty, plus you still owe the 20,000 allowances.		 Surrender allowances equal to verified emissions. Free allocation reduces what you buy, not what you surrender.
Netting allowances against the Scope 1 inventory Surrendered allowances subtracted from reported Scope 1 emissions, as if compliance reduced the tonnes emitted. Understated GHG inventory + CSRD error
Allowances are market instruments (outside_scopes); the tonnes emitted are unchanged.		 Report gross verified Scope 1; treat allowances as a separate compliance ledger. Never net.
Missing the surrender deadline Allowances not surrendered in the Union Registry by the deadline. €100/t penalty + name published + still owe allowances
The penalty does not discharge the obligation; it is additive.		 Track the surrender deadline; ensure any deficit is purchased and held well in advance.
Treating a UK installation under EU ETS rules Applying EUA prices and EU surrender rules to a UK-based installation covered by the UK ETS. Wrong system, wrong allowances
UKAs ≠ EUAs, no linking, prices diverge — the obligation is mis-stated entirely.		 UK installations comply under the UK ETS (from 2021). Only Swiss installations are linked to the EU ETS (since 2020).
Assuming free allocation is stable year to year Projecting next year’s free allocation flat, ignoring the LRF, benchmark tightening, and CBAM phase-down. Surprise deficit (see Example 2)
A 60,000 EUA drop turned a €0 year into a ~€1.3M purchase.		 Model the declining free allocation explicitly; CBAM-sector free allocation falls to zero by 2034.
Ignoring the maritime phase-in percentages A shipping operator surrenders 100% of 2024 emissions when only 40% was due in the first year. Over-surrender / mis-budget
Maritime phase-in: 40% (2024, surrendered 2025), 70% (2026), 100% from 2027.		 Apply the maritime phase-in percentage for the year, and the 100% intra-EU / 50% extra-EU coverage split.
Confusing the EUA price with the CBAM certificate price Using a stale EUA figure for a CBAM obligation, or vice versa. Mispriced obligation
CBAM tracks the EUA price but on its own averaging basis; they are linked, not identical at every moment.		 Use the EUA price for ETS surrender cost; use the CBAM certificate price (EUA-linked, weekly basis) for CBAM.

Methodology Metadata — For Compliance Documentation

Copy into your EU ETS compliance methodology record. The numeric figures are EEA-sourced; the framework rules are set by the legal instruments listed. Confirm operative thresholds and deadlines against the current consolidated Directive before each compliance cycle.

Methodology GreenCalculus EU ETS Allowance Calculation Methodology v1.1 (June 2026). greencalculus.com/methodology/eu-ets-allowance-methodology/
Numeric figures EEA Report ETC CM 2025/06 — annual average EUA prices (selected years 2013–2024), Total Number of Allowances in Circulation, Market Stability Reserve intake/cancellation volumes, free-allocation totals.
Framework Directive 2003/87/EC establishing the EU Emissions Trading System, as amended — notably Directive (EU) 2023/959 (“Fit for 55” revision: linear reduction factor, maritime inclusion, ETS-2).
Market Stability Reserve Decision (EU) 2015/1814 establishing and governing the Market Stability Reserve (upper threshold 833 M, lower threshold 400 M, holdings/validity cap 400 M).
Social Climate Fund Regulation (EU) 2023/955 establishing the Social Climate Fund (linked to ETS-2 revenue from 2027).
Climate target basis Regulation (EU) 2021/1119 (European Climate Law) — the 2030 and 2050 targets the Phase 4 cap trajectory is aligned to.
Scope of values EU ETS rows are market-structure values, tagged outside the GHG Protocol scopes. Used for compliance-obligation calculation; not for corporate inventory consolidation and not netted against Scope 1.
Phase basis Phase 4 (2021–2030) current. Linear reduction factor 4.2%/yr with one-off cap rebasings in 2024 and 2026. Phase 5 (2031–2040) design pending.
EU ETS Allowance Methodology — Compliance Obligation and Calculation Approach — GreenCalculus.com
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Does this regime apply to you? Scoping is a separate question from reporting, and the six regimes use six different size tests. For the thresholds side by side — revenue, public float, turnover, balance sheet and headcount — with first reporting years and assurance phase-ins, see Regulatory Thresholds.

Frequently Asked Questions

The allowances you surrender always equal your verified annual emissions — one EU allowance (EUA) per tonne of CO₂e, confirmed by an accredited verifier under the monitoring and reporting rules. The separate question is how many you must buy: that is your verified emissions minus the allowances you already hold for free (benchmark-based free allocation) plus any banked surplus. If free allocation plus banked allowances exceed emissions you have a surplus to bank forward; if they fall short you must purchase the deficit before the surrender deadline. Free allocation reduces what you buy, never what you surrender.

The linear reduction factor (LRF) is the fixed annual percentage by which the EU-wide cap on allowances declines. In Phase 3 it was 2.2% per year; Phase 4 raised it to 4.2% per year, and the “Fit for 55” revision (Directive (EU) 2023/959) added two one-off downward rebasings of the cap, in 2024 and 2026, to align with the EU’s 2030 target. The practical effect is that total allowances shrink faster than before — the supply backdrop tightens every year independent of any single operator’s emissions, which over time narrows free-allocation surpluses and raises the likelihood of a purchase requirement.

The Market Stability Reserve (MSR), established under Decision (EU) 2015/1814 and operational from 2019, controls the structural surplus of allowances — which once reached around 2.1 billion. It works off the Total Number of Allowances in Circulation (TNAC): above an upper threshold of 833 million, allowances are withdrawn from auctions into the reserve; below a lower threshold of 400 million, 100 million are released back. Reserve holdings above 400 million become invalid. At end-2024 the TNAC was 1,150 million — still above the upper threshold. The reserve held 671 million allowances at end-2023, of which 271 million were cancelled in 2024, with a further 271 million taken in from auctions that year.

Auctioning is the default method for distributing allowances in Phase 4 — operators buy allowances at auction, and the power sector receives essentially none for free. Free allocation is a declining carve-out for industrial sectors at risk of carbon leakage, calculated from EU-wide product benchmarks multiplied by activity level; total free allocation was around 500 million EUA in 2024, down about 7% on 2023. Both produce identical EUAs that count the same toward the surrender obligation — the difference is only whether you received them at no cost or paid for them. For CBAM sectors, the free share phases out fully by 2034 as the CBAM charge phases in.

Failing to surrender enough allowances triggers an excess-emissions penalty of €100 per tonne of CO₂e not covered (index-linked to EU inflation since 2013). The penalty does not discharge the obligation: you must still surrender the missing allowances in addition to paying it, and your name is published as non-compliant. The penalty is a sanction layered on top of the obligation, not a price cap or an alternative route to compliance. The practical defence is to ensure any deficit is purchased and held in the Union Registry well before the surrender deadline.

No. Your verified ETS emissions are genuine Scope 1 emissions and belong in your GHG Protocol inventory at their gross value. The allowances you surrender against them are a separate market instrument, classified as sitting outside the GHG Protocol scopes, and must never be netted against your Scope 1 total — surrendering an allowance discharges a legal obligation but does not reduce the tonnes you emitted. Keep two distinct ledgers: the inventory records emissions; the compliance account records allowances. Netting the two understates your inventory and would distort a CSRD ESRS E1 disclosure.

CBAM is the import-side mirror of the EU ETS: the CBAM certificate price tracks the EU allowance price, and the CBAM charge on importers phases in at the same rate that EU producers lose free allocation, with CBAM-sector free allocation reaching zero in 2034. See the EU CBAM methodology for the import side. On linking: the Swiss ETS has been linked to the EU ETS since 22 September 2020, with mutual recognition of allowances. The UK is not linked — after Brexit it runs a separate UK ETS from 2021, UK allowances (UKAs) are not interchangeable with EUAs, and the two prices move independently. A UK installation complies under the UK ETS, not this methodology.

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