Power semiconductors are a strategic industrial input for electric vehicles, grid equipment and industrial systems, with Europe’s technology security dependent on reliable, qualified supply across a complex manufacturing chain. Silicon carbide devices and other power modules convert, regulate and protect electricity in vehicles, solar inverters, battery storage, industrial motors and grid equipment.
Electricity systems increasingly rely on semiconductors rather than mechanical switching alone. The modules are lightweight, but can be critical to performance and supply security: a converter cannot enter service without the right module, cooling system or qualified firmware, even if its transformers, cabinets and cables are already at the project site.
Manufacturing dependencies extend beyond minerals
Producing a power module requires high-quality wafers, epitaxial layers, device processing, packaging substrates, bond wires, thermal interfaces and final testing, along with specialised equipment and manufacturing know-how. For silicon carbide, defect control and wafer yield can strongly influence cost. Reliability under thermal cycling and high electrical stress can matter more than a device’s nominal specification.
Equipment suppliers qualify specific combinations of chips, modules, gate drivers and cooling systems, rather than treating components as interchangeable. The European Union’s Critical Raw Materials Act identifies silicon metal and several semiconductor-related materials as strategic. The International Energy Agency’s Global Critical Minerals Outlook 2026 highlights vulnerabilities in the refining and production of minor minerals such as gallium and germanium, although not every power-electronics device uses those materials in the same way.
Europe’s exposure also includes wafer fabrication, packaging, equipment intellectual property and specialised process inputs. A new domestic assembly factory can still rely on imported semiconductor dies and manufacturing tools. A supplier that assembles the final module domestically but imports its critical semiconductor die has improved one part of the chain while retaining another dependency, a distinction relevant to assessing regional technology security.
European industrial policy can support wafer processing and packaging, but capacity announcements need to be assessed against qualified output and supplier acceptance. Useful measures include yield, reliability, process scale and the availability of specialised manufacturing equipment.
CBAM does not generally cover semiconductor devices
The European Union Emissions Trading System (EU ETS) affects power semiconductors mainly through electricity and some upstream industrial materials. The Carbon Border Adjustment Mechanism (CBAM) currently covers designated metals, cement, fertilisers, electricity and hydrogen products, but not semiconductor devices as a general category.
An imported module does not become directly chargeable under CBAM simply because its heat sink is aluminium or its cabinet contains steel. Separate metal goods included in a project package may have their own classifications and obligations. Future proposals to extend coverage downstream should be treated as scenarios until adopted.
Reliability testing is a commercial differentiator: a module can pass a factory electrical test and still fail after repeated temperature swings in service. Project requirements should include evidence of thermal cycling, voltage stress, package integrity and cooling-interface quality, as well as a clear process for investigating failures.
In high-voltage installations, replacing a module may require outages, specialist access and retesting, making the resulting cost far greater than the component’s invoice price. For a 20-year grid converter, obsolescence and replacement rights may matter more than short-term savings on silicon. Specifications should define efficiency, thermal performance, fault behaviour, electromagnetic compatibility, testing and failure support.
Owners should establish whether they can substitute a second module supplier without redesigning the converter. If not, they should secure long-term access and spares provisions in the technology agreement. Factories buying drives or charging systems should assess lifecycle electricity savings and availability alongside upfront module costs. Higher switching efficiency may reduce heat losses and cooling demand, while reliability failures can negate those gains.
The environmental case should be assessed over the full operating life and does not establish an automatic reduction in CBAM obligations. Installation and commissioning data should be retained to verify benefits and warranty obligations. The reference materials include the International Energy Agency’s Energy Technology Perspectives 2026, the European Commission’s Critical Raw Materials Act and the International Energy Agency’s Global Critical Minerals Outlook 2026.