As the EU Carbon Border Adjustment Mechanism moves from preparation into its operational phase, importers and exporters face a new kind of friction: not only how emissions are calculated, but whether electricity inputs can be credibly linked to low-carbon attributes. In Serbia, the constraint is structural and company-level, with “coal-linked by default” electricity remaining the residual outcome unless traceable sourcing is demonstrated through Guarantees of Origin or an equivalent instrument architecture accepted by EU counterparties. For CBAM-covered industries, the practical effect is that renewable capacity additions do not automatically translate into export competitiveness under carbon-accounting requirements.
A residual mix that sets the default for electricity claims
Serbia’s national residual mix for 2024, published by EMS, illustrates why escaping the default is difficult at scale. The corrected residual mix is dominated by brown coal and lignite at 66.60%, with hydropower at 23.81%, natural gas at 5.02%, wind at 0.97%, and solar at 0.36%. That residual mix functions as a “grid electricity fingerprint” for many CBAM-exposed exporters when consumption is not sufficiently backed by verifiable attributes.
The attribute market dynamics further tighten the compliance picture. EMS data shows Guarantees of Origin issued for production in 2024 total 2,405,275, while GO cancellations total 2,447,795, indicating a market that can be stressed by heavy industrial demand seeking to ring-fence electricity footprints. In this setting, “just buy green” can become scarce quickly when allocation is contested and administrative processes are not automatic.
Auctions add megawatts, but exporter-specific proof remains the binding constraint
Policy discussions around renewable auctions and grid upgrades matter for CBAM-related electricity outcomes, but they can mislead if treated as an automatic solution for exporters. Serbia’s second renewable auction, supported by EBRD, offered a quota of 424.8 MW split into 300 MW wind and 124.8 MW solar PV, supported through 15-year contracts for difference. In energy terms this represents a meaningful supply block; in exporter terms it depends on how much output can be made exporter-specific through PPAs and GO allocation.
A stress-test approach starts by translating production scale into annual “green power demand” measured in MWh that would need traceable low-carbon coverage to materially displace the coal-heavy residual mix for specific exporting firms. It then compares that demand against auctioned renewable output while accounting for the realities of attribute allocation and grid deliverability—because CBAM exposure ultimately turns on proof layers attached to electricity consumption.
Where CBAM pressure concentrates: steel, cement, fertilisers and aluminium processing
Serbia’s exporter set worth modelling is concentrated in a handful of large platforms rather than spread evenly across sectors. In steel, HBIS Serbia at Smederevo is identified as the single largest CBAM-exposed industrial export complex in the country, with corporate materials stating annual production capacity of 2.2 million tons of finished products and employment of more than 5,000 people. While steel’s biggest emissions driver remains process emissions from traditional routes, electricity becomes a competitiveness variable because it can change faster than deeper capex cycles.
In cement, exposure clusters around three plants operated by international groups: Moravacem (Popovac near Paraćin) with annual capacity of 1,350,000 tons; TITAN Cementara Kosjerić with production capacity of 750,000 tons per year; and a national total cement factory capacity of 3.4 million tons implying roughly 1.3 million tons for the remaining plant. Electricity procurement still matters even though clinker chemistry and kiln fuel dominate core emissions because it is measurable, auditable and contractable—making it increasingly relevant to lenders and EU-facing customers as a “proof of seriousness” signal.
Fertilisers and chemicals show similar compliance sensitivity where electricity intensity and traceability are becoming product strategy rather than optional CSR. Elixir Prahovo provides a clear example: its Prahovo 2027 materials state technology would reduce thermal energy consumption by 50% and electricity by 25% per ton of phosphoric acid produced. The point for CBAM-linked electricity claims is not current MWh precision but evidence that electricity input is being actively targeted ahead of tighter EU carbon and traceability expectations.
Aluminium exposure in Serbia is primarily processing rather than primary smelting, which changes the scale of electricity procurement needs but not the compliance logic. A processor’s electricity footprint is significant without reaching multi-TWh levels typical of electrolytic smelters, so mid-scale PPAs can cover a large share of consumption and reposition exported rolled or processed product footprints in EU value chains more quickly than many other interventions.
Company-level green power demand versus auctioned supply
Using conservative envelopes to translate production scale into traceable green power demand yields an estimated exporter range that highlights where the gap emerges. For HBIS Serbia, an envelope of 0.30–0.45 MWh per ton implies annual electricity demand between 660–990 GWh for a plant at 2.2 million tons per year. The strategic interpretation is that ring-fencing and proving roughly 700–900 GWh per year of renewable electricity would allow HBIS to credibly argue its purchased electricity input is largely decarbonised even if longer-cycle process solutions remain necessary.
For cement grinding and plant utilities excluding kiln thermal energy, conservative modelling places electricity intensity around 90–120 kWh per ton; applied to 3.4 million tons this produces roughly 306–408 GWh per year for the national cement platform envelope. For Elixir Prahovo and related cluster activity, disclosed output scale includes 165,000 tons of phosphoric acid annually and an NPK fertiliser plant with 300,000 tons per year capacity; combined with a stated plan to reduce electricity consumption by 25% per ton under Prahovo 2027 this frames a conservative ring-fencing envelope at about 100–250 GWh per year. For aluminium processing, a conservative annual envelope of 50–150 GWh per year is considered reasonable for rolled or processed product plant scale.
Aggregating these envelopes gives likely exporter “green electricity demand” of approximately 1.12–1.80 TWh per year, with HBIS Serbia as the dominant driver—making it difficult to solve Serbia’s CBAM-linked green power debate through small symbolic projects alone without portfolio-scale procurement and explicit attribute allocation.
The supply side: incremental renewables still fall short once proof allocation is applied
The second auction’s quota corresponds to incremental renewable output that looks close to demand on paper but diverges once proof constraints are introduced. Converting quota using conservative capacity factors yields wind output of about 788–920 GWh per year for the 300 MW wind component using a 30–35% range, while solar output is about 164–197 GWh per year for the 124.8 MW solar component using a 15–18% range. Combined this implies roughly 952–1,117 GWh per year of incremental renewable energy in an average year.
The binding constraint is not whether energy exists but how much becomes exporter-allocable with cancellable GOs under near-term allocation realities shaped by EMS residual mix conditions and GO cancellation scale in 2024. A policy-realistic stress-test assumption places exporter-allocable share at only 40–60% because other customers—including households and public supply obligations—also compete for green attributes and administrative allocation is not automatic.
Under that allocation range, exporter-allocable green supply from the quota becomes about 381–670 GWh per year (952–1,117 GWh per year multiplied by 40–60%). Compared with exporter demand of roughly 1.12–1.80 TWh per year, the resulting residual gap is approximately 0.45–1.42 TWh per year—consistent with planning gaps used to quantify what major CBAM-exposed exporters would need but cannot reliably obtain if they rely only on the auctioned pipeline within current attribute market structure.
Grid deliverability links directly to CBAM-proof feasibility
The geography of mismatch affects both deliverability and cost because major exporter loads sit in different parts of Serbia than prime wind corridors. The largest exporter load sits in the Belgrade–Danube basin while many strong wind corridors are in Vojvodina and South Banat; transmission reinforcement therefore becomes strategically aligned with renewable growth rather than treated as separate infrastructure planning.
The BeoGrid 2025 project is publicly described as worth €205 million and official communications describe new high-voltage lines connecting Belgrade and Novi Sad plus an additional line toward the Čibuk connection substation to stabilise transfer from South Banat and relieve network congestion. This grid architecture functions as a physical enabler for exporter-anchored renewable procurement because scaling credible green procurement requires both reliable delivery to load basins and attribute registry capability to allocate proof layers.
Two pathways for compliance-ready procurement
Serbia’s CBAM-linked electricity strategy splits into two realistic pathways that matter differently across sectors covered by CBAM: cement, steel, aluminium processing alongside fertilisers and chemicals where electricity intensity has become part of product strategy; plus broader implications for electricity procurement structures relevant to hydrogen-related decarbonisation planning even when hydrogen itself is not detailed here as a Serbian export case.
The first pathway is “supplier allocation,” where exporters obtain renewable attributes from EPS or suppliers through GO-backed supply contracts relying on pooled renewable output; this can work for mid-scale loads like cement and aluminium processing where green needs are in hundreds of GWh range provided GO cancellation mechanisms are explicit and credible. The second pathway is “exporter-anchored build,” where large exporters sponsor new renewable projects or contract them via long-term PPAs with assigned GOs cancelled against their consumption; this pathway is described as necessary to solve scale problems for HBIS Serbia and reduce the national green electricity gap faced by CBAM-exposed exporters.
Regulatory relevance: what importers should watch as ETS-linked reporting tightens
For EU importers managing CBAM-related reporting burdens alongside EU ETS compliance expectations under the European Green Deal framework, Serbia’s case points to an operational risk: renewable capacity additions do not automatically remove residual-mix attribution outcomes when GO-backed coverage cannot be allocated at company level at sufficient scale. The quantified gap—about 0.45–1.42 TWh per year between estimated exporter green power demand (1.12–1.80 TWh) and exporter-allocable supply from auctioned renewables (0.38–0.67 TWh)—shows why proof-layer constraints can dominate over headline generation figures.
The analytical synthesis from these facts is straightforward: closing CBAM-linked competitiveness gaps requires deliberate carve-outs where projects and attributes are earmarked for CBAM-exposed exporters rather than relying on general market absorption of auctioned output into supplier portfolios without systematic GO allocation to industrial customers.