Power semiconductor makers commit to new SiC capacity through 2029

Aug. 1 — Announced silicon carbide fabrication capacity for delivery through 2029 has already exceeded the total announced in any prior single year, as power semiconductor makers respond to demand from EV traction inverters and grid-scale power electronics simultaneously.

Two demand sources, one supply chain

EV powertrains and grid infrastructure used to draw on largely separate silicon supply chains. SiC has changed that: the same substrate and device technology that improves inverter efficiency in a vehicle also improves conversion efficiency in grid-scale power electronics, meaning both end markets are now bidding for the same wafer capacity.

Where capacity is being added

• Substrate growth — still the tightest step in the supply chain, with boule-growth capacity the hardest to add quickly.
• Epitaxy and device fabrication, where several announced expansions are co-located with substrate production to shorten the supply chain.
• Packaging and module assembly, scaling to match wafer output rather than lagging behind it as in previous cycles.

The substrate bottleneck

Even with fabrication capacity announcements running ahead of demand forecasts, substrate boule growth remains the pacing item — it is the slowest and most capital-intensive step to add, and several announced fabs are effectively pre-booking substrate supply years in advance of the fab itself coming online.

Outlook

Pricing for SiC devices is expected to stay firm through the buildout period despite the capacity additions, because the substrate constraint means effective supply will lag the headline capacity numbers for several years yet.

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Data and sources. Figures in this analysis are indicative, included for structure — replace with cited sources before publication. Analysis by The ID Project research desk. Nothing here is investment advice.