CBAM and Solar Mounting Structures: Why Carbon Data Is Now Part of Your Bracket Spec

For years, choosing a solar mounting supplier came down to three questions: does the structure hold, does it install fast, and what does it cost per watt? A fourth question has now joined the list, and it is not going away — how much carbon is embedded in the steel and aluminum you are importing?

The EU's Carbon Border Adjustment Mechanism (CBAM) has moved from a reporting exercise into a mechanism with real financial consequences. For anyone shipping mounting structures into Europe, CBAM is no longer a policy topic for the sustainability team. It is a procurement topic, a pricing topic, and increasingly a qualification topic.

At FarSun, we manufacture solar mounting systems for ground-mount, rooftop, carport and agrivoltaic projects. We have been through the CBAM data questions with EU customers, and we have sat in the room at industry sessions run by third-party certification bodies on CBAM and international certification for steel structures. Below is a practical summary of what actually matters.

1. What CBAM Is — In One Paragraph

CBAM is the EU's tool to prevent "carbon leakage": the risk that European producers simply relocate carbon-intensive production to countries with weaker climate rules or get undercut by higher-carbon imports. It works as the mirror image of the EU Emissions Trading System (EU ETS). Where an EU producer pays a carbon price on its emissions, an importer must pay an equivalent price on the embedded emissions of the goods it brings in. CBAM covers iron and steel, aluminum, cement, fertilizers, hydrogen and electricity — and its scope has been extended to steel- and aluminum-intensive downstream products, precisely to close the loophole where raw steel is taxed but a fabricated steel part is not.

Solar mounting structures are steel and aluminum in almost their purest commercial form. That is the point every buyer needs to internalize.

2. Why Solar Racking Is Directly Exposed

A mounting system is typically 90%+ metal by weight: hot-dip galvanized steel or pre-galvanized steel profiles, aluminum rails, clamps and fasteners. There is very little "non-CBAM" content to dilute the carbon footprint.

Three consequences follow:

a) Carbon becomes a cost variable, not a marketing claim. Two suppliers can quote the same €/kW. If one produces from a high-emission steel route and the other from a lower-emission route with verified data, the landed cost after CBAM obligations is no longer the same. Price comparison without carbon data is now an incomplete comparison.

b) The obligation sits with the EU importer — but the data sits with you. The importer (or their indirect customs representative) must hold authorized CBAM declarant status once imports exceed the mass-based threshold set in the regulation. They declare embedded emissions and surrender the corresponding certificates. But they cannot invent the data. Every number they submit has to come from the producer — from your mill, your galvanizing line, or your fabrication plant.

c) No data means default values, and default values are punitive by design. If a producer does not provide emissions data calculated under the prescribed methodology, or if that data has not been verified by an accredited verifier, the importer must fall back on default values. Those defaults carry a mark-up that increases progressively over the phase-in period. In other words: a supplier who cannot document its carbon becomes structurally more expensive than one who can — even if its factory is genuinely clean.

3. What This Means for Project Economics

Three practical effects we already see in EU tenders:

1. Bid documents are adding carbon-data clauses. Not as a bonus criterion, but as an eligibility condition — no data package, no bid.
2. Buyers are consolidating suppliers. Managing CBAM paperwork across a fragmented supplier base is expensive. Buyers prefer fewer suppliers who can deliver a complete, audit-ready dossier.
3. Material choice is being revisited at design stage. Section optimization, higher-strength steel that reduces tonnage, and recycled-content aluminum all reduce both the physical weight and the carbon liability. Every kilogram of steel removed at the design stage is a kilogram that never carries a carbon cost.

The cheapest structure on paper is no longer automatically the cheapest structure at the border.

4. How FarSun Approaches It

Carbon accounting for a mounting system is only as good as the material records underneath it. That is where we put the work.

• Traceable material sourcing. Every structure is traceable to its material batch and supply source, with mill test certificates on file. Where a supply route can document its production method, we treat that as a point in its favor — so that when embedded emissions data is required for a shipment, the request follows a documented trail rather than starting from nothing.

• Design for lower embedded carbon. This is where we can move the number the most, and it does not depend on anyone's paperwork. Structural optimization, right-sized sections and coating systems matched to the actual corrosion environment reduce material intensity without compromising a 25-year design life. Because the liability scales with tonnage, every kilogram removed at the design stage is a kilogram that never carries a carbon cost.

• Documentation discipline. Mill certificates, coating records, dimensional and load documentation and structural calculation reports are organized as a single dossier, in a form that can be handed to your customs broker, your auditor or your verifier without being reassembled from scratch each time.

• Working to your verification route. Under CBAM, actual values only count once they have been checked by an accredited verifier — no supplier can simply issue a finished figure, and anyone offering you a "CBAM certificate" is describing something that does not exist. What we can do is engage early with your importer and their verifier and tell you precisely which data we can put behind a given order, in what form, and what has to come through the verification route itself.

That last point is the one to test us on. Scope varies by material, by mill and by order, so instead of a blanket claim, ask us about the specific structure you are buying — you will get a specific answer.

5. The Bottom Line

CBAM does not ban anyone from the European market. It simply makes opacity expensive. Producers with clean processes and clean records will find themselves at an advantage; producers who cannot document anything will pay the default-value premium regardless of how efficient they actually are.

For solar mounting structures — a product that is essentially processed metal — this is not a marginal issue. It is a structural shift in how suppliers are selected.

It also rewards work done early. Once a structure is designed, its tonnage is fixed and so is the carbon that comes with it — the cheapest carbon is the steel a project never has to buy. That decision sits at the drawing stage, long before anyone files a declaration.

If you are planning a European project, bring us the wind and snow loads, the terrain and the module layout, and we will engineer the structure around them — and stay in the conversation when the carbon paperwork follows.

FarSun — Solar Mounting Structures. Engineered to hold. Documented to pass.

This article is provided for general information and does not constitute legal or customs advice. Importers should confirm their specific obligations with their national competent authority or a qualified advisor.