Carbon capture projects rarely fail on technical grounds anymore. The capture chemistry works, the compression works, the pipelines work. What keeps killing these projects is something far less glamorous: the arithmetic. Heidelberg Materials’ proposed carbon capture facility at its Edmonton cement plant is the latest cautionary tale—a project that cleared engineering feasibility, regulatory review, and even secured public funding commitments, yet still couldn’t justify a final investment decision on the economics.
The Edmonton project was, on paper, one of the more credible CCS proposals in North America. Cement is among the hardest sectors to decarbonize, and unlike power generation, process emissions from clinker production cannot be eliminated by switching fuels. Roughly 60% of a cement plant’s CO2 comes from the limestone calcination reaction itself, not combustion. If carbon capture has an obvious industrial fit, it is here. Heidelberg Materials had conducted front-end engineering work, engaged with provincial and federal support programs, and positioned the project as a flagship for industrial decarbonization in Alberta.
And yet the project stalled. The reason was not capture cost in isolation but the absence of any revenue stream commensurate with that cost. Cement is a brutally competitive, regionally priced commodity. A producer cannot unilaterally embed a $60–100 per tonne capture cost into a product that sells into a market where rivals face no such obligation. Compare this with power markets, where tax credits like 45Q provide a defined per-tonne revenue floor, or enhanced oil recovery, where captured CO2 has a direct buyer. Industrial cement capture in Canada sits in a policy gap: the investment tax credits and carbon price floors help, but they do not fully bridge the spread between the cost of capture and what the market will pay for “green” cement—which, at present, is not much.
This is the structural problem institutional investors should internalize. CCS project viability today depends on one of three conditions: a policy-backed revenue stream (tax credits, carbon contracts for difference), a commercial off-taker for the CO2, or a regulatory mandate that forces capture costs onto all producers simultaneously. Edmonton had partial versions of the first condition and none of the other two. Public funding support reduces capital exposure, but it does not change operating economics over a 25-year asset life. A project that requires continuous subsidy to clear its weighted average cost of capital is not self-sustaining infrastructure—it is a policy-dependent position, and it should be underwritten as such.
The financing implications are worth spelling out. CCS assets are capital-intensive, single-purpose, and largely immobile. That combination demands either very low costs of capital—typically balance-sheet financing from an investment-grade parent—or contracted, investment-grade revenue streams that support project finance structures. Heidelberg Materials has the balance sheet, but management evidently concluded that the return on incremental capital deployed did not meet hurdle rates relative to other uses, including share buybacks and growth in more profitable product lines. That is disciplined capital allocation, not a repudiation of the technology. Investors should read it that way.
There is also a signal here for how CCS pipelines will actually develop. The projects that proceed will cluster where all three viability conditions align: the US Gulf Coast, where 45Q, existing CO2 infrastructure, and oilfield demand for EOR overlap; the North Sea, where UK and Norwegian government-backed transport and storage networks socialize midstream costs; and select Canadian industrial hubs where carbon contracts for difference may eventually firm up the carbon price signal. Projects outside these clusters will continue to die in the feasibility-to-FID gap, regardless of their engineering merit.
None of this means cement decarbonization is impossible. It means the sequencing is wrong in most jurisdictions. Storage infrastructure and cost-bearing mechanisms must be in place before capture economics can work at industrial scale—and policymakers, not project developers, control that timeline.
The Edmonton outcome is, in the end, a healthy correction. It demonstrates that even well-supported, technically sound CCS proposals will be held to investment-grade scrutiny, and that public subsidies alone cannot substitute for a real market price on stored carbon. Capital will flow to carbon capture only when the revenue math closes—and until it does, the discipline Heidelberg Materials just displayed will remain the industry’s most reliable filter.
