Transformer manufacturers, by MVA, kV and plant

Hyosung’s Memphis plant builds power transformers from 69 to 765 kV up to 2,250 MVA. Tamini lists phase-shifter throughput up to 1,800 MVA, a different rating basis from conventional transformers. Mitsubishi Electric has built a 1,510 MVA nuclear GSU, Toshiba and HD Hyundai Electric publish ratings up to 1,500 MVA, and Siemens Energy up to 1,300 MVA. On voltage, Toshiba, BHEL and TARIL build to 1,200 kV AC, and TBEA, China XD and Siemens Energy build HVDC converter transformers to ±1,100 kV.

Sources: Hyosung, Tamini (phase-shifter throughput), Mitsubishi Electric, Toshiba, HD Hyundai, Siemens Energy, Siemens Energy voltage classes, TBEA, China XD, BHEL, TARIL

21 makers in this table run a verified US transformer plant. For large power transformers: Hitachi Energy (South Boston, Virginia), Hyosung (Memphis), HD Hyundai Electric (Montgomery, Alabama), Prolec GE (Waukesha, Wisconsin and Goldsboro, North Carolina), Pennsylvania Transformer Technology, Virginia Transformer and Delta Star. For distribution: ERMCO, Howard Industries, Central Moloney, Eaton and MGM. Filter the table by US plant to see all of them.

Sources: Hitachi Energy, Hyosung, HD Hyundai, Prolec GE, PTT, Virginia Transformer, ERMCO

The largest announced US projects: Hitachi Energy’s $528M plant in Gallman, Mississippi (production 2029) and $457M large power transformer plant in South Boston, Virginia; Eaton’s $340M three-phase plant in Jonesville, South Carolina (2027); Howard Industries’ $236.95M across three Mississippi counties; HD Hyundai’s $200M second Alabama plant (2027); and Hyosung’s additional $157M Memphis expansion announced in November 2025, following its separate $50.8M May project. In the EU, Končar and Siemens Energy are putting EUR 260M into Zagreb and Siemens Energy about EUR 220M into Nuremberg.

Sources: Hitachi Energy, Eaton, Howard, HD Hyundai, Hyosung, Končar, Siemens Energy

24 makers here market a data center line or have disclosed a data center order. Eaton builds the Envirotran HDC substation transformer (300 to 12,000 kVA) for data centers. LS Electric won a KRW 180 billion (about $132M) order for 345 kV units for a US hyperscale AI campus, Sieyuan shipped 175 MVA, 138 kV units to a Texas data center, and Sanil Electric is supplying Bloom Energy’s US data center projects.

Sources: Eaton, LS Electric, Sieyuan, Sanil

Power transformers sit in transmission and generation substations: tens to hundreds of MVA at 69 kV and up, including generator step-up (GSU) units and HVDC converter transformers. Distribution transformers step medium voltage (up to about 35 kV) down to the service voltage: pole-mount, pad-mount and dry-type units from a few kVA to a few MVA. Data center campuses buy both: a substation power transformer and dozens of pad-mount or dry-type units. Use the Segment filter to split the table.

Yes. The full table is free to reuse under CC BY 4.0 with a link to transformervendors.com, as CSV or JSON. Every record carries its source URLs and verified date.