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Isometric’s Low Carbon Cement Protocol v1.0 creates a framework for issuing Environmental Attribute Certificates (EACs) tied to eligible low-carbon clinker, cement and concrete. It uses book-and-claim accounting, so a buyer can acquire the environmental attribute separately from the physical material. The framework is intended to connect qualifying producers with buyers beyond their local markets; the sources available do not document certificates already issued, sold or retired under it.
Published as a certified protocol on 28 October 2026, the framework addresses a persistent challenge in construction: lower-carbon cement can be difficult to sell at a premium when demand is limited in the producer’s local market. Isometric says its rules are designed to give buyers a way to support verified reductions without requiring delivery of the cement itself. Cement production accounts for approximately 8% of global greenhouse gas emissions, according to Isometric’s protocol.
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What does the protocol do?
The protocol sets the cement-, clinker- and concrete-specific rules for EAC eligibility, emissions calculations, safeguards and certificate attributes within Isometric’s broader registry infrastructure. The registry’s Low Carbon Cement Protocol v1.0 specifies what evidence a project must provide and how its certificates are handled. It operates alongside cross-cutting registry rules and references standards including ISO 22095-3:2026 and the Science Based Targets initiative’s Corporate Net-Zero Standard Version 2.0.
Book-and-claim separates an environmental attribute from physical delivery. A producer might sell cement to a local customer while transferring an EAC representing the eligible environmental attribute to a buyer elsewhere. The certificate buyer does not receive the cement, and whether it can make a particular emissions or procurement claim depends on the reporting framework that applies to that buyer.
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The protocol is technology-agnostic within its eligibility rules. Potential pathways include carbon capture and storage or utilization, novel binders, kiln electrification, biomass or other lower-carbon fuel switching, supplementary cementitious material blends, and cement reduction enabled by product performance. Listing a pathway does not automatically make a particular project eligible; each must satisfy the protocol’s requirements and exclusions.
What must a producer demonstrate?
Eligibility depends on the product, its emissions evidence, the decarbonization pathway and the production vintage. A validation and verification body reviews compliance at validation, with continued compliance checked through surveillance audits.
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- Verified product EPD: The product must be covered by a Type III Environmental Product Declaration under ISO 14025. It must be product-specific and facility-specific, verified by a qualified verification body, and report A1–A3 cradle-to-gate carbon intensity.
- Emissions threshold: The product must meet the applicable GCCA intensity threshold for its product, production region and production vintage.
- Pathway and impact disclosures: The project must satisfy pathway and exclusion rules and provide a catalytic-impact narrative.
The threshold changes according to when output was produced. The protocol’s regional appendix states that its country-level values are current as of January 2026; if a country is not listed, the protocol directs users to the global value.
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| Production vintage | Applicable GCCA band | Practical meaning |
|---|---|---|
| 2025–2029 | Band C | Output must meet the applicable Band C threshold for its product and production region. |
| 2030 onward | Band B | The threshold tightens to Band B for output from 2030 onward. |
The tightening is prospective by production vintage: it does not retroactively disqualify certificates already issued for an earlier vintage. Producers should therefore establish the relevant product, region and production year before assessing a project against a threshold.
What safeguards apply to the certificates?
Each EAC relates to one functional unit and includes carbon-intensity and baseline attributes. The protocol requires safeguards against double counting and sets a downstream transfer path from the project proponent toward the end user. Producers may not retire their own EACs to change the reported carbon intensity of their own product or its EPD.
Certificates also have a time limit: an EAC must be retired within 24 months after the end of its production-vintage year or it expires. The protocol relates this window to construction procurement cycles and the exception in SBTi Version 2.0. Buyers should confirm that the intended claim is compatible with their own reporting rules rather than treating registry issuance alone as approval for every use.
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Does the protocol mean buyers can already purchase certificates?
Not on the evidence reported with the announcement. Agg-Net’s 28 October 2026 report describes certification of the framework and its intended market opportunity, but the cited sources do not show projects validated under it or EACs issued, traded or retired. Global buyer access and additional producer revenue are the mechanism’s intended potential, not demonstrated transaction results.
Agg-Net reported that more than 12,200 companies had SBTi-validated targets as of its 28 October article, illustrating the potential buyer pool discussed in the market framing. That figure is attributed to the trade-news report, not independently established here. A draft-stage Isometric announcement on 25 August cited a different count—more than 11,500—so the two dated figures should not be blended.
What should construction buyers and producers check?
For a producer or project developer, the first practical question is whether the product-specific, facility-specific EPD and recognized product-standard evidence are already in order. Next, check the applicable regional or global threshold for each production vintage, then assess pathway exclusions, validation and surveillance requirements, and the certificate retirement window.
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For a construction buyer, confirm what the EAC represents, whether it is linked to the relevant product and production vintage, and whether the buyer’s own emissions-accounting or procurement framework accepts the intended claim. The certificate transfers an environmental attribute, not physical cement, so it should not be described as proof that a project received that material.
The announcement’s quoted supporters frame trusted rules and independent verification as prerequisites for this market. Agg-Net quoted Isometric chief science officer Stacy Kauk saying the protocol could connect producers to buyers worldwide, and CURA co-founder and chief technology officer Phil De Luna describing credible rules as important to market development. Those are attributed views about the protocol’s promise, not independent evidence that the market has already delivered sales or emissions reductions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
Does buying a low-carbon cement EAC mean the project receives low-carbon cement?
No. The protocol separates the certificate’s environmental attribute from physical delivery, so an EAC purchase does not establish that the buyer’s construction site received the represented cement or concrete.
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Can an EAC be used in every company’s emissions report?
Not automatically. A buyer needs to check the rules of its applicable reporting framework and confirm that the proposed claim is consistent with those rules; registry eligibility alone does not settle every buyer’s accounting treatment.
What happens if a cement EAC is not retired in time?
Under the protocol, it expires if it has not been retired within the specified window. Buyers and sellers should account for that deadline in contracting and construction procurement planning.
Are all carbon-capture or alternative-binder cement projects eligible?
No. These are examples of potential pathways, not blanket approvals. A project still has to satisfy the protocol’s product, EPD, threshold, pathway and exclusion requirements and undergo the required validation.
