Market evolution: Liquid dielectric transformers (CN 850421) — 2015–2025

Introduction

This report analyzes the evolution of EU trade in liquid dielectric transformers (CN 850421, power handling capacity ≤ 650 kVA) from 2015 to 2025. Based on trade data with non-EU countries, the period is characterized by a fundamental shift in the EU's trade position, a major reorientation of sourcing, and rising import volatility. The EU has transitioned from a net exporter to a significant net importer, driven by a surge in demand met by a select group of non-European suppliers. These dynamics have direct implications for the EU's industrial strategy and energy security. The data for this analysis can be explored further on the Trade Dashboard.

I. From Self-Sufficiency to Import Dependency: A Structural Shift in EU Trade Balance

The most significant trend over the decade is the dramatic reversal of the EU's trade balance, moving from a position of self-sufficiency to one of import dependency.

The EU's trade balance has collapsed into deep deficit.

The EU's trade balance for this product has undergone a total transformation. Starting from a surplus of €101 million in 2015, it swung to a deficit of -€154 million by 2025, a change of -252%. The EU's net import reliance moved from -15.8% in 2015 (indicating a net exporter) to +9.9% in 2025 (a net importer). This points to a sustained structural shift rather than a temporary fluctuation.

Import growth has vastly outpaced export performance.

The divergence is stark when comparing the trajectories of imports and exports.

Source: Compiled from General Overview data.

While EU exports managed to increase their unit value by 59%, this was insufficient to compensate for a 40% drop in volume. Meanwhile, imports grew substantially in both volume and value.

Domestic production shifted towards higher value but collapsed in volume.

EU production data reveals a strategic pivot. Production volume plummeted from 9 million units in 2015 to just 150,000 units in 2025 (-98%). However, the production value surged from €392 million to €1.16 billion (+196%). This indicates that remaining EU manufacturers have concentrated on producing fewer, higher-value (likely more complex or customized) transformers, while the market for standard or volume products has been ceded to imports.

II. Geographic Reconfiguration: The Rise of New Sourcing Hubs and Evolving Export Markets

The geography of EU trade has been reconfigured, with import sourcing becoming more concentrated among a few key non-EU players, while export destinations have shown more volatile patterns.

Import sourcing has consolidated around a new set of major suppliers.

The Herfindahl-Hirschman Index (HHI) for imports by value decreased from 3,356 to 1,936 (-42%), suggesting a shift from a highly concentrated to a moderately concentrated import market. However, this masks the rise of a few dominant suppliers.

Source: Compiled from Top Partners data.

The explosive growth from Türkiye and China is the primary driver of the import surge. Their combined share of EU imports rose from a minor fraction to a dominant position, fundamentally altering the supply chain.

EU export markets have become more concentrated and less stable.

In contrast to imports, the concentration of EU exports by value increased significantly (HHI from 932 to 2,145, +130%). Exports have become more reliant on fewer partners. The United Kingdom and Switzerland remained the top two destinations, with the UK growing its share to €68M (+42%). However, exports to several former key markets in Africa and the Middle East, such as Algeria (-98%), Saudi Arabia (-89%), and Nigeria (-85%), collapsed. This suggests a strategic or competitive retreat from these regions.

The intra-EU production landscape shows significant specialization.

Analysis of revealed comparative advantage in 2025 shows that production is highly localized. Croatia, Bulgaria, and Poland are the most specialized producers within the EU. Conversely, countries like Lithuania, Denmark, and Greece show virtually no specialization, relying almost entirely on intra-EU or extra-EU imports. This highlights an uneven industrial capacity across the Union.

III. Price Volatility and Supply Chain Vulnerabilities

The period 2015–2025 has been marked by significant price shocks and rising volatility, particularly in import channels, pointing to vulnerabilities in the EU's supply security.

Import prices have exhibited high volatility from new suppliers.

The coefficient of variation (CV) for import values from key partners indicates risk. Import flows from China (CV: 1.54) and Türkiye (CV: 1.23) show very high volatility, meaning their trade values have been highly unpredictable over the period. This contrasts with more stable, traditional suppliers like Switzerland (CV: 0.67).

Specific, sharp price shocks have been detected in export flows.

The shock detection analysis identifies notable price abnormalities in EU exports:

• Exports to the United States: A severe price shock in 2022 (abnormality: 481.9, price shift: +616%).
• Exports to Thailand: A major price shock in 2023 (abnormality: 243.5, price shift: +95%).
• Exports to Chile: An extreme price shock in 2022 (abnormality: 122.3, price shift: +3,807%).

While the share of these flows in total export value is moderate (3.2%, 2.9%, and 1.2% respectively), the scale of the price swings suggests episodes of extreme market tightness, possibly linked to specific project orders or global supply disruptions.

The EU's export propensity has declined, signaling reduced competitiveness.

The EU's export propensity (exports as a share of production) fell from 21.5% in 2015 to 13.0% in 2025 (-40%). This metric is flagged as having high salience. It reinforces the earlier finding: as the EU internal market turns to imports to meet demand, the relative ability of its producers to compete in third-country markets is diminishing.

Conclusion

Over the decade 2015–2025, the EU market for liquid dielectric transformers (CN 850421) underwent a profound structural transformation. The region shifted from being a net exporter with a positive trade balance to a net importer running a substantial deficit. This was driven by a 347% surge in import value, overwhelmingly supplied by Türkiye and China, which now dominate sourcing. Concurrently, EU exports declined in volume, becoming more concentrated on a few Western markets like the UK.

The data suggests that EU manufacturers have strategically moved up the value chain, producing fewer but more expensive units, while losing ground in volume and third-country markets. This reconfiguration has introduced new vulnerabilities: import dependency has grown, supply channels are more volatile, and the EU's export competitiveness has weakened. These trends underscore a critical challenge for European energy and industrial policy, pointing to a need for strategic investment in domestic manufacturing capacity and diversification of supply chains to ensure resilience and autonomy.