What is the EU ETS and UK ETS?

The EU Emissions Trading System and its UK counterpart are cap-and-trade markets where covered installations must surrender one allowance per tonne of CO2 emitted. Allowances are bought at the prevailing carbon price, so emissions become a direct, rising operating cost.

How is compliance cost calculated?

Compliance cost equals chargeable emissions × carbon price, where chargeable emissions are total covered tonnes minus any free allocation. For example, 50,000 tonnes with 30% free allocation leaves 35,000 chargeable tonnes; at €80/tonne that is €2.8 million per year.

What does the break-even CapEx mean?

It is the largest one-off decarbonisation investment that pays back purely from avoided carbon cost over your chosen horizon, ignoring other savings. It equals annual avoided carbon cost × payback years. If an abatement project costs less than this, the carbon saving alone justifies it.

Why does free allocation matter so much?

Free allocation is shrinking under both schemes as the cap tightens and the EU's CBAM phases in. A high free allocation today can mask large future exposure: as it falls toward zero, your chargeable tonnes — and cost — rise even if emissions stay flat.

Is my data sent anywhere?

No. Every calculation runs locally in your browser. The figures you enter are never transmitted or stored on any server.

What is the Carbon Price Impact on Business Cost Calculator?

Enter annual tonnes of CO2 covered by an emissions trading scheme, current and projected carbon prices, and your free-allocation percentage to compute current compliance cost, projected 2030/2035 cost, and the CapEx break-even for a decarbonisation investment. It runs free in your browser on Gera Tools, with nothing uploaded.

Carbon Price Impact on Business Cost Calculator

Name: Carbon Price Impact on Business Cost Calculator
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

The Carbon Price Impact Calculator turns your emissions and a carbon-price outlook into hard operating-cost numbers. It shows what compliance costs you today, what it could cost at 2030 and 2035 price scenarios, and how much you can justify spending on decarbonisation to avoid that cost.

How it works

Under an emissions trading scheme you pay for each tonne you emit above your free allocation. The calculator works in three steps:

chargeable tonnes = covered tonnes × (1 − free allocation %)
annual cost       = chargeable tonnes × carbon price

It applies this at the current price and at your 2030 and 2035 projected prices so you can see the cost trajectory. Because free allocation is falling under both the EU and UK schemes, you can also enter a lower future allocation to model that exposure.

For investment decisions it computes the break-even CapEx for abatement:

break-even CapEx = annual avoided carbon cost × payback horizon (years)

This is the most you can spend on a project that eliminates the emissions and still pay back from the avoided carbon cost alone, before counting energy or other co-benefits.

How EU ETS and UK ETS free allocation is changing

Free allocation is one of the most important variables in this calculation — and it is falling under both schemes as the phase-down timetable tightens. Understanding the trajectory matters for forward-planning:

EU ETS Phase 4 (2021–2030): Free allocation is being phased down each year. The EU Carbon Border Adjustment Mechanism (CBAM), fully operational from 2026, is the primary driver: as CBAM phases in on imports, the free allocation for domestic covered sectors phases out to remove the incentive for carbon leakage protection. Sectors that currently receive a high free allocation percentage face a sharp cost increase as it falls.
UK ETS: Followed a similar structure post-Brexit, with its own cap and phase-down schedule. The UK government has committed to tightening the cap toward net-zero alignment.

Entering a lower future free allocation percentage (for example 0% in 2035 for sectors losing all free allocation) is the most important scenario to test after the base price scenario.

Worked example

A manufacturing plant covered by the EU ETS:

Covered emissions: 50,000 tCO2e per year
Current free allocation: 30% → chargeable tonnes = 35,000
Current carbon price: €80/t → current cost = €2.8 million/year

2030 scenario — price rises to €130/t, free allocation falls to 10%:

Chargeable tonnes: 50,000 × (1 − 0.10) = 45,000
Annual cost: 45,000 × €130 = €5.85 million/year (more than double)

Break-even CapEx at current cost, 5-year horizon:

€2.8 million × 5 = €14 million

A heat pump system, process electrification project, or fuel switch that eliminates these emissions and costs less than €14 million pays back purely on avoided carbon cost, before any energy savings or other co-benefits. At the 2030 scenario, the same calculation gives: €5.85M × 5 = €29.25 million — nearly doubling the justifiable investment.

Using this for board-level investment decisions

The break-even CapEx figure is designed to be the opening number in an abatement investment case. When presenting to a board or finance committee, the standard approach is:

Show the current compliance cost and the 2030/2035 scenarios as the “do nothing” baseline.
Show the break-even CapEx as the maximum investment that carbon cost alone justifies.
Layer in the additional co-benefits (energy cost reduction, scope 1 reduction toward net-zero targets, reputational/ESG).
The combined case almost always improves the break-even significantly above the carbon-only figure.

The tool gives you step 1 and 2 in under a minute — no spreadsheet needed for an initial scoping assessment.