Hyosung Heavy Industries

Hyosung Heavy Industries is listed as a transformer manufacturer in Seoul, South Korea. Products and scope on file: power transformers, distribution transformers and dry-type and cast-resin transformers. Sourced figures on file: highest sourced voltage 765 kV; indicative capacity ~120,000 MVA/year. These are the highest sourced values, not an audited company maximum. Reported standards on file: IEC and IEEE.

🇰🇷 South Korea · Seoul · Listed · Official website ↗

Head office: 119, Mapo-daero (Gongdeok-dong), Mapo-gu, Seoul, Republic of Korea, 04144. Hyosung Heavy Industries global network — Head Office of Hyosung Heavy Industries Co., Ltd., Mapo-gu, Seoul. Changwon is listed as a plant. Memphis is listed as Hyosung HICO, Ltd. (checked 2026-10-15).

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Independent census profile, not the company website. How this census is compiled. Last reviewed 2026-08-28 · Profile status Listed

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Data Provenance: Official Manufacturer Source

Last reviewed: 2026-08-28

Pending technical specifications: Test bay specifications & utility references

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Capabilities

Power Distribution Dry-type

Indicative capability data

Indicative sourced capacity / yr	~120,000 MVA (sourced figure — not independently audited)
Highest sourced voltage evidence	765 kV
Product types	power, distribution
Regions served	Asia, Americas
Reported standards	IEC, IEEE
Source	Hyosung Heavy Industries Regulatory Filing & Factory Records ℹ

These are the highest sourced figures on file — they are not asserted as the company maximum unless an authoritative source states that. Voltage summary is MAX(accepted voltage evidence records, tier filing). Annual capacity and voltage evidence are independent values and are never combined into a single product rating. Verify against the manufacturer before a procurement decision.

Sourced specifications

Maximum voltage stated	765 kV. source checked 2026-10-15 manufactures a variety of transformers with a maximum voltage of 765 kV and a maximum capacity of 1,500 MVA
MVA	up to 1500 MVA. source checked 2026-10-15 manufactures a variety of transformers with a maximum voltage of 765 kV and a maximum capacity of 1,500 MVA
Plants	Changwon Plant — Changwon, South Korea. source checked 2026-10-15 we have manufactured more than 7,500 extra-high-voltage transformers at the Changwon Plant alone
ISO certifications	ISO 9001. source checked 2026-10-15 ISO9001 ISO 14001. source checked 2026-10-15 ISO14001 ISO 45001. source checked 2026-10-15 ISO45001

Only figures quoted from the linked page are shown. A missing line means that field has no public source on file.

Related components

Transformer bushings On-load tap changers Cooling systems Insulation materials Protection & monitoring Oil & preservation Conductors & core steel

Relevant applications

Utilities & Grid HVDC & Converters Renewable Energy Data Centres Railways & Metro

Markets

South Korea manufacturers Seoul South Korea market

Confirmed manufacturing facilities

Where an independent source documents a transformer manufacturing plant, it is catalogued here with its verified facility ID and source attribution. Factory capability is separate from the company group maximum and is never inferred from it.

Seoul, South Korea
Changwon, South Korea EHV transformers (7,500+ units)	source ↗
Nantong, China transformers	source ↗
Memphis, Tennessee, United States 765 kV UHV transformers (only US facility)	source ↗

Travelling for a factory visit in Changwon

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Reported capability — sourced evidence

Evidence is attached to a single reported quantity (voltage or rating) and is not combined into a single product capability. It is shown because a source confirms it; it is not asserted as the company's maximum.

Voltage class evidence	765 kV

Confirmed UHV (765 kV-class) transformer & reactor supply deal. Evidence of UHV capability — NOT asserted as the company maximum.

Latest intelligence about this company

No published intelligence evidenced as about this company. Curated Daily Intel is refreshed at build — see Daily Intel for the latest feed.

Upcoming events

BIXPO 2026 (Gwangju) — KEPCO Power Technology Expo 4 Nov 2026 · Gwangju, South Korea

Last reviewed: 2026-08-28.

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