Overview
Cleveland-Cliffs Inc. (NYSE: CLF) is a U.S. steel producer and the sole domestic producer of grain-oriented electrical steel (GOES) — the specialized silicon steel used in the cores of power and distribution transformers. GOES is produced at the company’s Butler Works mill in Butler, Pennsylvania. In 2024 Cliffs announced a $150M plant in Weirton, West Virginia to manufacture distribution transformers itself, vertically integrating from the steel into the finished grid component.
Key Facts
- Sole U.S. GOES producer. Grain-oriented electrical steel is “exclusively produced in the United States by Cleveland-Cliffs, at its Butler Works steel mill in Butler, Pennsylvania.” Cleveland-Cliffs Weirton Transformer Plant — Utility Dive - 2024-08-06
- Primary-source confirmation (Cliffs’s own words): the Butler Works company page states “Regular Grain-Oriented (RGO) products are used for power and distribution transformers. Cleveland-Cliffs is the only producer of this in the United States.” The verbatim exclusivity is scoped to RGO specifically; Butler Works also produces TRAN-COR high-permeability GOES for power transformers, plus CRNO grades, chrome austenitic stainless, and carbon slabs. Butler Works — Cleveland-Cliffs - 2026-06-02
- Precision caveat: Cliffs is the only domestic GOES producer, not the only global producer. Japanese, Korean, European, and Chinese mills also produce GOES, which is why U.S. transformer makers remain import-dependent. US Transformer Lead Times Extend to Four Years — pv magazine USA - 2026-05-11
- Butler Works scale: 3.5M sq ft, fully integrated (230-ton EAF, 175-ton AOD, two double-strand continuous casters), ~1 hour north of Pittsburgh. Butler Works — Cleveland-Cliffs - 2026-06-02
- Weirton, WV transformer plant: $150M ($100M Cliffs + $50M West Virginia grant); repurposes the idled Weirton tinplate mill; three-phase distribution transformers; expected online H1 2026; consumes 30–40% more GOES tonnage. Cleveland-Cliffs Weirton Transformer Plant — Utility Dive - 2024-08-06
- CEO: Lourenco Goncalves — “There will be no AI without electricity, and there will be no electricity without transformers.” Cleveland-Cliffs Weirton Transformer Plant — Utility Dive - 2024-08-06
- Raw-material constraint: GOES (alongside copper) named by pv magazine USA as a binding constraint behind four-year transformer lead times; constrained domestic production keeps developers import-dependent. US Transformer Lead Times Extend to Four Years — pv magazine USA - 2026-05-11
Newsletter Relevance
Cliffs sits at the chokepoint inside the chokepoint of the AI buildout. The transformer is the binding constraint on data-center grid connection (AI Buildout Grid Constraint); the steel inside the transformer traces to a single domestic mill. For the June 5 flagship’s grid layer, Cliffs is the entity that converts an abstract “transformer shortage” into a concrete single-source-control story — the cleanest Chokepoint Control example on the physical-infrastructure side, parallel to how Samsung + SK Hynix are the chokepoint on the memory side. The vertical-integration move (steel → transformer) and the domestic-content position are reinforced by copper tariffs and Section 232 duties.
Connections
- AI Buildout Grid Constraint — Cliffs’s GOES is the raw material underneath the transformer bottleneck
- Chokepoint Control — single-source domestic production
- Hitachi Energy — a downstream transformer manufacturer competing to expand U.S. capacity
- Samsung / SK Hynix — the memory-supply chokepoint the grid chokepoint is welded to in the AI-capex story
- Speed to Power — on-site generation as the workaround when transformers can’t be sourced in time
Source Appearances
- Butler Works — Cleveland-Cliffs - 2026-06-02 — the primary company page; the sole-US-RGO claim in Cliffs’s own words, plus mill specifics (TRAN-COR, 3.5M sq ft, equipment, markets)
- Cleveland-Cliffs Weirton Transformer Plant — Utility Dive - 2024-08-06 — establishes the sole-U.S.-producer fact, the Weirton plant, and the Goncalves quote
- US Transformer Lead Times Extend to Four Years — pv magazine USA - 2026-05-11 — GOES named as a binding constraint behind four-year lead times
Open Questions
- What share of the global GOES market does Cliffs hold, and how much of the U.S. transformer shortfall is import-substitutable vs. genuinely supply-limited?
- Does the Weirton plant (H1 2026) materially move domestic distribution-transformer supply, or is it small relative to the 9,000-units-by-2030 demand projection?
- How exposed is Cliffs to copper tariffs and Section 232 duties as a cost-input vs. a domestic-content beneficiary?