Decarbonization · Cement

Decarbonizing cement: the honest pathway

Cement is decarbonization's hardest case: ~60–65% of its CO2 is process chemistry — calcination of limestone releases CO2 regardless of fuel — and only ~35–40% comes from burning fuel in the kiln. That split dictates the strategy: efficiency and fuel measures attack the fuel share now; the calcination share ultimately needs clinker substitution or CCS.

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Cost exposure

What one t cement carries, 2026 → 2034

Year	Free allocation (EU)	Payable carbon cost	Annual bill (per 100,000 t cement)
2026	97.5%	€1.35 / t cement	€135,450
2030	51.5%	€26.28 / t cement	€2,627,730
2034	0.0%	€54.18 / t cement	€5,418,000

At EUA €77.4 (11 Jun 2026) and ≈0.7 t CO2/t cement (clinker-driven; GNR/IEA range 0.5–0.9). EU ETS industry schedule; exporters under CBAM follow the mirrored phase-in. Power sectors pay 100% from day one.

⬇ This table + pathway (CSV)🖨 PDF for management

📦 Cement is a CBAM sector: exports to the EU pay the border price on the mirrored phase-in — see the CBAM guide and the no-carbon-price countries: Saudi Arabia, UAE, Qatar, Oman, Egypt.

The pathway, ranked

Reduction measures for cement

Clinker substitution (SCMs: slag, calcined clay)−30%

Alternative fuels (waste, biomass)−15%

Thermal efficiency: preheaters, insulation, heat recovery−10%

Kiln electrification (emerging)−35%

CCS on calcination−60%

Indicative reduction potential of each measure against the relevant emissions share (sources: IEA industry roadmaps, sector associations — see each measure page). Measures stack but don't simply add.

The fast tonnes

Heat losses you can cut this budget year

Kiln shells run too hot for conventional jackets, but the rest of the plant doesn't: raw-mill hot-gas ducting, preheater tower fittings, coal-mill air systems and the boiler house all carry removable-insulation candidates. On the fuel share, every 1% of thermal efficiency ≈ 0.003 t CO2/t cement — at 500,000 t/yr and €77/t that's ≈€115k/yr per percentage point as free allocation ends.

Method: ASTM C680 / ISO 12241 surface energy balance — the same engine as our public calculators. Typical removable-insulation effect across hot-process plants: 2–5% of fuel-related CO2, payback up to 2 years.

Context

How cement compares (t CO2 per unit)

Hydrogen production9 t/t H2

Ammonia & fertilizers2 t/t NH3

Steel — BF-BOF (integrated)1.9 t/t steel

Aluminium1.6 t/t Al

Lime1.2 t/t lime

Petrochemicals1 t/t HVC

Power — coal0.95 t/MWh

Cement0.7 t/t cement

Direct-emission intensities, typical published values per industry page — units differ by product; see each page for sources.

FAQ

Cement & carbon, answered

Why is cement so hard to decarbonize?

Roughly two-thirds of its CO2 is released by limestone chemistry (calcination), not fuel — so even a zero-carbon-fuel kiln still emits. Deep cuts need less clinker per tonne (SCMs) or carbon capture.

What is the CO2 intensity of cement?

≈0.5–0.9 t CO2 per tonne of cement depending on clinker ratio and fuel mix; ≈0.7 is a typical world figure (GNR/IEA). The EU ETS benchmark pushes toward the low end.

Does CBAM apply to cement exports to the EU?

Yes — cement is one of the six CBAM categories, including indirect (electricity) emissions. Exporters without a domestic carbon price pay the full EU-linked certificate price on a rising share to 2034.

How this page is built: heat-loss figures follow ASTM C680 / ISO 12241 (the method behind our public calculators); facility emissions from Climate TRACE & EU ETS verified data across 30,000+ industrial sites; the 2026–2034 schedule is Regulation (EU) 2023/956, not a forecast. Published by Inzonex — manufacturer of modular removable insulation (UK Patent GB2508992.1). Spotted an error? Tell us — we correct on evidence.