Hyosung Heavy Industries (Hyosung HICO)

South Korean maker of extra-high-voltage power transformers up to 765 kV, built in Changwon and at its Memphis, Tennessee plant, which produces 69-765 kV units up to 2,250 MVA for North American utilities.

HQ KR PowerUS plantUS expansion

Verified 11 Nov 2026

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2,250MVALargest rating

765kVHighest voltage

$157MLargest US/EU expansion

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 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; mobile; phase-shifting; gas-insulated (SF6); ester-filled; traction (Scott); furnace; STATCOM 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.: 2,250 2
Smallest rating kVA Smallest published rating, in kVA. Shows how far down the distribution range a maker goes.: Not published
Product range The kVA/MVA range as the maker states it, by product line.: Corporate line up to 1,500 MVA, 765 kV; HICO Memphis power transformers 69-765 kV up to 2,250 MVA 1
Highest voltage kV Highest voltage class the maker publishes or has delivered, in kV (AC system voltage; HVDC noted under Voltage classes).: 765 1
Voltage classes Voltage classes and BIL as the source states them, by product or plant.: 69 kV to 765 kV 2
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.: Changwon, South Korea; Memphis, Tennessee, United States; China (Jiangsu) 1
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; China 1
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 2
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.: Additional $157M Memphis expansion announced November 2025, +50% manufacturing capacity and 240 new jobs, separate from the May 2025 $50.8M project. October 2026 company update confirms cumulative investment over $300M since 2019 and a +50% expansion being completed; $300M is not a single new project amount. No completion date stated in either release. 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.: 157 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).: ISO 9001; ISO 14001; ISO 45001; EN ISO 3834 (welding); built to IEC, ANSI, IEEE, NEMA, BS, JIS, JEC 1
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

Hyosung Heavy Industries: Power transformers accessed 2026-11-11
Hyosung HICO: Home accessed 2026-11-11
Hyosung Heavy Industries: Brand journalism (search listing: bases in Tennessee and Jiangsu) accessed 2026-11-11
Hyosung HICO: November 2025 Memphis expansion announcement accessed 2026-11-11
Hyosung HICO: May 2025 expansion, $50.8M and 123 jobs accessed 2026-11-11
Hyosung HICO: October 2026 update, cumulative Memphis investment over $300M accessed 2026-11-11

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