manufactured · input
Oil-paper or resin-insulated condenser bushing that allows high-voltage conductors (69–765 kV) to pass through the grounded transformer tank. EHV bushings are custom-engineered for each transformer and take 12–18 months to manufacture. Hitachi Energy (formerly ABB Power Grids) holds ~35% of the global bushing market; their production in Ludvika, Sweden is the primary global source for EHV classes.
4
Source countries
4
Companies
1
Goods affected
0
Claims on record
What depends on it
1 essential American goods rely on high-voltage transformer bushing (ehv) somewhere upstream in their supply chain.
Where it comes from
Share of global supply, by country.
| Country | Share of supply |
|---|---|
| CHSwitzerland | 35% |
| DEGermany | 25% |
| CNChina | 20% |
| USUnited States | 15% |
Who makes it
4 companies produce high-voltage transformer bushing (ehv).
Global power grid technology company; formerly ABB Power Grids (acquired by Hitachi in 2020). Revenue ~$12B (2024). Produces LPTs at plants in Varennes (Canada), Lodz (Poland), Halle (Germany), Jefferson City MO (US), and India. One of the three dominant global LPT manufacturers alongside Siemens Energy and GE Vernova. Hitachi Energy produces ~15% of US LPT imports. Long lead times (24–36 months) across all facilities.
Global leader in high-voltage power transmission components including bushings, current transformers, and coils. Headquartered in Berlin; 2,600+ employees across 9 factory locations in Austria, Bulgaria, Canada, China, France, Germany, and Italy. Formerly a Siemens subsidiary; acquired by Triton Partners private equity. Primary bushing production site at Leonding, Austria (near Linz). In 2024, Trench Austria invested €16M to expand Leonding capacity; further €31M planned for 2025 — effectively doubling bushing production capacity. In October 2024, signed agreement with GE Vernova Grid Solutions to supply HVDC DC Wall Bushings, power transformer bushings, coils, and instrument transformers for renewable energy infrastructure.
World's foremost manufacturer of electrical insulators, headquartered in Nagoya, Aichi Prefecture, Japan. Produces ultra-high-voltage (UHV) bushing shells including the world's largest porcelain object: an 11.5-meter-long UHV bushing shell reaching 1.6 meters in diameter. Primary production at Nagoya Headquarters/Mizuho site and Chita Plant (Aichi). Sole global supplier of UHV-class porcelain bushing shells for the highest-voltage grid infrastructure (800kV, 1,000kV, 1,100kV applications). Bushing shells produced at NGK are finished into complete bushings by transformer OEMs and bushing system makers.
Siemens Energy AG (Munich, Germany; Xetra: ENR; spun off from Siemens AG in September 2020; ~€35B revenue) manufactures industrial gas turbines and centrifugal compressor systems for pipeline transmission applications. Key pipeline compression products: SGT-400 (13 MW), SGT-700 (32 MW), and SGT-800 (57 MW) industrial gas turbines coupled with STC-SH and STC-GH centrifugal compressor trains. Siemens Energy serves major European, Middle Eastern, and North American pipeline operators. Russian Gazprom historically used Siemens Energy gas turbines for its mainline compression on the Nordstream and Siberian pipeline systems — the 2022 Russia-Ukraine war and turbine sanctions created a supply crisis for Gazprom compression maintenance, demonstrating the geopolitical entanglement of pipeline compressor supply chains. Primary manufacturing at Ludwigshafen, Germany and Berlin. Siemens Gamesa (renewable energy) is majority-owned by Siemens Energy.
