Make better decisions on the low-carbon cement market

Low-carbon cement is going mainstream at the big producers, while startups with new chemistries face a harder road.

We've found a lot of interesting signals. For example, Holcim said low-carbon cement made up 40% of its cement volumes in the first half of 2026. In January 2026, the EU's carbon border tax entered its definitive phase, and cement is one of the products it covers. Meanwhile, Sublime Systems paused its planned plant in Massachusetts in December 2025 after losing its federal grant, even with Microsoft signed up as a buyer. The incumbents are scaling what works in today's kilns, and radical new processes still struggle to get built.

In this section, we look at why blended cements are moving faster than new chemistries, how carbon prices change the math for producers, and what that means for startups.

Cement is one of the largest sources of CO2 in the world, and most of it comes from the chemistry itself, not from the fuel.

We compare six kinds of low-carbon cement companies, from clinker substitutes and calcined clay blends to geopolymers, new clinker chemistries, CO2 mineralization and electric production. Their buyers range from cement producers and ready-mix suppliers to contractors, developers and public agencies. For each, we rank the pains that matter most, like rising carbon costs, building codes that don't recognize new binders, and shrinking supplies of slag and fly ash.

This shows who will pay more for a lower-carbon cement today, and who will only switch once rules or prices force them to.

Selling blended cement at a premium, licensing a process to producers, selling additives, earning carbon credits and signing long contracts with big buyers: low-carbon cement companies make money in different ways.

We set the models side by side: who pays, and what each one costs to run. Blended cements use existing kilns, so the cost is low but so is the margin. A new chemistry needs its own plant, which means years of construction and a lot of capital. Licensing a technology to producers needs little capital, but each producer has to agree to change its process. And many buyers pay a green premium on only a small share of their projects.

You'll see which models make money at today's carbon prices, and which only work if those prices keep rising.

A forecast means little until you know what pushes it. We go through the forces one at a time.

Some drivers are clear: carbon prices in Europe, public buyers asking for low-carbon concrete, and developers chasing green building labels. Others reinforce each other. Standards based on performance let new cements in without long approvals. Each approved project gives engineers a reference for the next one. And as more producers sell blends, prices fall and builders stop seeing them as a risk.

Before building or investing, you should know what makes an engineer approve a new cement for a structure, and what makes a producer change a kiln it has run for decades.

Brimstone and Terra CO2 get much of the attention in low-carbon cement, but most of the market is built by quieter companies.

Some of the most interesting players work behind the scenes. Some sell additives that let a producer use less clinker in the same plant. Others turn local clay into a clinker substitute, lock CO2 into concrete at the ready-mix yard, or test electric kilns in pilot plants.

They're hard to spot because cement is local and sold in bulk. A producer may use a startup's technology under its own brand, and the builder never learns the name of the company behind it.

Below are the market grids and ecosystem maps we've built to show who makes which kind of low-carbon cement, who buys it, and where new players are getting in.

Ecocem, Hoffmann Green, CarbonCure… a few low-carbon cement companies already sell real volume to paying customers.

Ecocem started with slag cements and now builds plants in France for its lower-clinker technology. Hoffmann Green makes clinker-free cement in France and sells it to builders. CarbonCure licenses equipment that injects CO2 into concrete at ready-mix plants. Each found a way to fit into the existing industry, though none has yet changed how most of the world makes cement.

We'll look at how these teams worked with producers and standards instead of fighting them, and what that teaches anyone bringing a new binder to market.