Google's green steel certificates are Stegra's ramp-up financing

Google has agreed to buy environmental attribute certificates tied to near-zero emission steel from Stegra's plant in Boden, Sweden, covering as much as 91,000 tonnes in the first year, with both companies saying they intend to explore additional volumes over the life of the agreement. Because the certificates do not travel with the metal, the deal runs through a book-and-claim structure: one buyer takes the physical steel and another takes the environmental attributes attached to it, which is how a company with no practical route to Swedish green steel can still pay for the industrial emissions it is trying to address.

Scarcity makes the structure necessary. Near-zero emission steel is geographically concentrated, and a buyer whose supply chain cannot reach it — because of location or because of procurement constraints — has no physical alternative to fall back on. The certificate is that alternative, and it is one Google has reached for before, first in clean electricity and more recently in sustainable aviation fuel. "Decarbonizing the most challenging sectors requires every tool in our toolbox," said Adam Elman, Google's director of sustainability for Europe, the Middle East and Africa, calling certificates "another vital mechanism" alongside physical procurement.

For Google the certificates address emissions tied to steel used across its operations, including the construction of data centers, where materials demand keeps climbing as digital infrastructure expands. A hyperscaler tends to build where power and land allow, which is rarely where near-zero emission steel is made, so the certificate's job is to close a gap the physical supply chain leaves open. For Stegra the agreement is more than booked demand for environmental attributes: it generates cash during the early years of operations and the production ramp at Boden, the stretch when a new mill is least able to fund itself from steel sales alone.

Stegra plans to apply the book-and-claim mechanism to its non-prime steel — the material a mill produces outside prime specifications — and, because new facilities generate a higher proportion of it during their initial production period, Stegra says that tonnage comes off the same process as the rest of its output, made with green hydrogen and renewable electricity. That is where the economics sharpen. Non-prime steel normally clears at a discount to prime, so if an attribute can be sold against off-spec tonnage at anything near the certificate value Google is paying, Stegra has lifted the value of the material a conventional mill would mark down. Neither company disclosed a certificate price, which leaves the size of any premium as inference rather than arithmetic.

That inference is the reason to take the agreement seriously rather than file it as a modest first-year volume. The structure, not the tonnage, is the product. A certificate market for steel works only if the attribute can be measured, verified and transferred the way a renewable energy credit is, and only if buyers accept that paying for an attribute settles a procurement problem they cannot solve physically. Google has now answered the second question for steel, leaving the first harder: the certificate's value depends on the buyer surrendering any physical claim to the metal, a discipline electricity markets spent years building and the open question this agreement is meant to test. This publication has argued that transition capital is migrating to the offtake and the term sheet rather than the label, and a ramping mill's off-spec output is exactly the kind of project-level risk that migration is about.

None of that makes the certificate a donation. The buyer negotiates structure — a first-year volume, an option to expand, the treatment of off-spec tonnage — and the seller trades an environmental attribute for cash it needs before its customers arrive. The corporate offtake is now a CFO product rather than an ESG badge, and a certificate that converts a ramping mill's output into revenue is the cleanest version of that shift. It is also where the money sits: first-time climate funds are scouting deals they cannot fund, while the buyers carrying balance sheets write the offtakes themselves. The test now is whether the additional volumes the two companies say they will explore become real, and whether a second mill lists certificates against its own off-spec steel. Google has spent the year assembling climate products whose value sits in a specific metric — hectares in a Brazilian rice project, attributes here — and each one widens the template. Stegra plans to apply the mechanism to its non-prime tonnage; whichever producer first sells that material at a premium to its physical discount will set the price the next steel offtake is written against.