HD Hyundai Electric
South Korean maker of power transformers up to 800 kV and 1,500 MVA, shunt reactors and distribution transformers, built in Ulsan and at an Alabama plant that adds a second 765 kV-capable factory in 2027.
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Facts
Source per value- Segment Power when the maker publishes power, GSU, HVDC, autotransformer or reactor products or a rating above 20 MVA; Distribution when it publishes distribution, pad-mount, pole-mount, network or dry-type products; both when it publishes each. Derived from Transformer types and Largest rating.
- Power and distribution 1
- Transformer types Product types the maker lists, separated by semicolons: power, GSU, autotransformer, HVDC, shunt reactor, substation, distribution, pad-mount, pole-mount, network, dry-type (cast resin, VPI), mobile, rectifier/industrial, renewable and data center lines.
- power; GSU; shunt reactor; HVDC; phase-shifting; mobile; distribution; pad-mount; pole-mount; cast resin; gas-insulated; SVC; traction (railway); furnace; marine; natural/synthetic ester 1
- Largest rating MVA Largest verified published rating in the cited product or regional scope, in MVA. Product range identifies base, forced-cooling, phase-shifter throughput or group-history claims; these rating bases are not interchangeable. Planned future ranges are described separately.
- 1,500 1
- Smallest rating kVA Smallest published rating, in kVA. Shows how far down the distribution range a maker goes.
- 10 2
- Product range The kVA/MVA range as the maker states it, by product line.
- Pole-mount 10-333 kVA; pad-mount to 10,000 kVA; oil distribution 100-50,000 kVA; cast resin 100-20,000 kVA; power transformers up to 1,500 MVA; shunt reactors to 250 Mvar 1
- Highest voltage kV Highest voltage class the maker publishes or has delivered, in kV (AC system voltage; HVDC noted under Voltage classes).
- 800 1
- Voltage classes Voltage classes and BIL as the source states them, by product or plant.
- power up to 800 kV; shunt reactors up to 765 kV; distribution up to 36 kV 1
- Plants Transformer manufacturing locations, city and country. Planned plants carry their target date. Location lists identify verified sites and may not cover every factory in a global group.
- Ulsan, South Korea (power transformers); Ulsan Seonam, South Korea (distribution transformers); Montgomery, Alabama, United States (since 2011); second Montgomery plant (planned 2027) 3
- Plant countries Countries with verified operating transformer manufacturing in the cited scope; not necessarily the complete global footprint. Component and service-only sites do not establish new-unit manufacturing.
- South Korea; United States 3
- US plant Yes when an operating US transformer plant is verified; No when the source shows the maker's plants and none is in the US. Empty means not verified.
- Yes 4
- EU plant Yes when an operating transformer plant in an EU-27 country is verified (the UK, Norway, Switzerland and Turkey do not count). Empty means not verified.
- Not published
- Capacity expansion Announced transformer capacity expansions: amount in the original currency, place, announcement date, target date and output change. US and EU projects first.
- $200M second plant, Montgomery, Alabama, groundbreaking 2026-03-06, completion due 2027-04, ~50% more EHV transformer capacity and 765 kV production and testing; current plant at 105 units/yr (up from 70) 4
- Largest US/EU expansion $M Largest single announced US or EU transformer capacity investment, in US$ millions, where the source states a dollar amount. Euro amounts stay in Capacity expansion unconverted.
- 200 4
- Expansion region Where the announced capacity expansions are: US, EU, both, or only elsewhere (Other).
- US 4
- Certifications and standards Quality certifications, listings and design standards the source names (ISO 9001, IEEE C57, IEC 60076, EU Ecodesign Tier 2, utility approvals).
- Not published
- Data center offer Yes when the maker markets transformers for data centers or has disclosed a data center transformer order. Empty means not found.
- Not published
- Data center product or order The named data center line, or the disclosed order with value and date.
- Not published
- Parent or owner Parent company or owner where the source states one.
- Not published
- HQ country Country of the maker's headquarters.
- South Korea 1
- HQ region Region of the maker's headquarters.
- Asia-Pacific 1
- Legacy brands and names Sourced former names and acquired transformer businesses, retained on the current maker row to avoid duplicate supplier counts.
- Not published
Sources
- HD Hyundai Electric: Power transformer accessed 2026-11-11
- HD Hyundai Electric: Distribution transformer accessed 2026-11-11
- HD Hyundai Electric: Locations accessed 2026-11-11
- Korea Times: HD Hyundai Electric expands US transformer manufacturing capacity (8 Mar 2026) accessed 2026-11-11
- Korea Times: HD Hyundai Electric hits 1,000-transformer milestone at US plant (2 Aug 2026) accessed 2026-11-11
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