Power Transformer Lead Times of 128 Weeks Are Driving the 2025
- Standard power transformers averaged 128-week lead times and GSUs averaged 144 weeks in Wood Mackenzie's Q2 2025 survey.
- Wood Mackenzie models a national supply deficit of about 30% for power transformers and 10% for distribution transformers in 2025.
- Since 2019, GSU demand has grown 274%, substation power transformers 116%, and power-transformer demand overall 119%.
- Power-transformer prices are up about 77% since 2019, with some distribution-transformer classes up to 95% higher.
- Cleveland-Cliffs is the sole US producer of grain-oriented electrical steel, made at its Butler Works mill in Butler, Pennsylvania.
Power transformers averaged 128-week lead times and generator step-up units (GSUs) averaged 144 weeks in Wood Mackenzie’s second-quarter 2025 transformer supply survey — delays of roughly two and a half years that are now the binding constraint on US grid expansion. Those lead times are the structural opening for the solid-state transformer (SST), whose semiconductor supply chain is decoupled from the grain-oriented electrical steel and copper-winding bottlenecks that throttle conventional transformer production.
The Scale Of The Shortage
Wood Mackenzie models a national supply deficit of about 30% for power transformers and 10% for distribution transformers in 2025 — the gap between actual orders and manufacturer capacity. The demand surge is broad-based: since 2019, demand for GSUs has grown 274%, substation power transformers 116%, and power-transformer demand overall 119%, while distribution-transformer demand rose 34%. Prices have followed, up roughly 77% for power transformers since 2019 and as much as 95% for some distribution classes.
The Material Bottleneck
The shortage traces to a single material chokepoint. Transformer cores require grain-oriented electrical steel (GOES), a highly engineered alloy with the magnetic properties needed for efficient power conversion. In the United States, Cleveland-Cliffs is the only domestic producer of GOES, made at its Butler Works mill in Butler, Pennsylvania. As one industry analysis put it, every US transformer manufacturer drawing on domestic steel “draws from a single source, and when that source faces capacity constraints, pricing pressure, or supply disruptions, the effect ripples through the entire domestic transformer manufacturing base immediately.” Cleveland-Cliffs is investing about $150 million in a new electrical-transformer plant in Weirton, West Virginia, but new core-steel capacity takes years to come online.
Policy And The SST Opening
The US Department of Energy has acknowledged the squeeze: in April 2024 it delayed enforcement of new distribution-transformer efficiency rules to avoid worsening the shortage, while its long-term standards still favor American-made GOES. Wood Mackenzie projects the power-transformer deficit narrows below 10% only by 2030. That multi-year gap is precisely the window SST vendors are targeting — an SST’s value proposition is not just efficiency but a supply chain built on silicon-carbide semiconductors rather than the GOES and copper that gate conventional units.
Why It Matters
For grid planners, 128-week power-transformer lead times and 144 weeks for generator step-up units are the binding constraint on US grid expansion, and they are the clearest economic opening the SST has, because its semiconductor supply chain sidesteps the grain-oriented steel and copper-winding bottlenecks entirely. A modeled 30 percent national supply deficit turns a technology preference into a scheduling necessity for any project that cannot wait two and a half years for iron.
Critical Perspective
Editorial correction: This post is part of MGRID’s Solid-State Transformer industry coverage. As of May 2026, that body of work systematically framed manufacturer announcements, funding rounds, and laboratory demonstrations as commercial deployments. The reality is that field-deployed commercial-class SST in revenue service globally is measured in single digits. A 128-week conventional lead time is a real opening, but SST production capacity at grid scale is itself nascent and cannot absorb the deficit today. Readers should treat the specific claims in this post against the standards documented in our [SST Industry Reality Check](/?p=9044). The corrective article is the canonical reference for SST industry reality; this post remains published with its original framing so the editorial drift is traceable.
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