Power transformer manufacturers
Power transformers carry transmission and generation: tens to hundreds of MVA at 69 kV and up. This list holds 47 makers. 20 publish a rating of 1,000 MVA or more, led by Hyosung at 2,250 MVA↗, and 17 build at 765 kV or above, up to 1,200 kV at Toshiba↗, BHEL↗ and TARIL↗.
| Hyosung Heavy Industries (Hyosung HICO) | 2,2502 | 7651 | South Korea; United States; China | Yes | 1574 | South Korea | 2026-11-11 |
|---|---|---|---|---|---|---|---|
| Tamini Trasformatori | 1,8003 | 5503 | Italy | — | — | Italy | 2026-11-11 |
| Mitsubishi Electric | 1,5101 | 7652 | Japan | — | — | Japan | 2026-11-11 |
| Efacec | 1,5002 | 5252 | — | — | — | Portugal | 2026-11-11 |
| HD Hyundai Electric | 1,5001 | 8001 | South Korea; United States | Yes | 2004 | South Korea | 2026-11-11 |
| Toshiba Energy Systems & Solutions | 1,5001 | 1,2001 | Japan; India; China | — | — | Japan | 2026-11-11 |
| Virginia Transformer | 1,4001 | 5251 | United States; Mexico | Yes | 403 | United States | 2026-11-11 |
| Siemens Energy | 1,3001 | 1,1002 | Germany; Austria; Croatia; Italy; Brazil; Colombia; Mexico; China | — | 1504 | Germany | 2026-11-11 |
| BEST Transformer | 1,2501 | 7651 | Türkiye | — | — | — | 2026-11-11 |
| Sieyuan Electric | 1,2501 | 7501 | China | — | — | China | 2026-11-11 |
| TBEA | 1,2301 | 1,1002 | China | — | — | China | 2026-11-11 |
| Prolec GE (GE Vernova) | 1,2001 | 8001 | Mexico; United States; Brazil | Yes | 1404 | Mexico | 2026-11-11 |
| SGB-SMIT Group | 1,2001 | 7651 | Germany; Netherlands; Romania; United States | Yes | — | Germany | 2026-11-11 |
| Fuji Electric | 1,1001 | 8001 | Japan; Thailand | — | — | Japan | 2026-11-11 |
| BHEL | 1,0001 | 1,2001 | India | — | — | India | 2026-11-11 |
| Jiangsu Huapeng Transformer (JSHP) | 1,0001 | 8501 | China | — | — | China | 2026-11-11 |
| Končar | 1,0001 | 5501 | Croatia | — | — | Croatia | 2026-11-11 |
| Pauwels Transformers | 1,0001 | 5251 | Belgium | — | — | — | 2026-11-11 |
| Tatung | 1,0001 | 5001 | Taiwan | — | — | — | 2026-11-11 |
| Transformers and Rectifiers India (TARIL) | 1,0001 | 1,2001 | India | — | — | India | 2026-11-11 |
| Fortune Electric | 7751 | 5301 | Taiwan; China | No | — | Taiwan | 2026-11-11 |
| Elsewedy Electric | 7501 | 5001 | Egypt; Indonesia; Pakistan | — | — | Egypt | 2026-11-11 |
| Pennsylvania Transformer Technology | 7501 | 7651 | United States | Yes | 102.52 | United States | 2026-11-11 |
| JST Power Equipment | 6004 | 5004 | United States; Mexico; Malaysia; China | Yes | — | United States | 2026-11-11 |
| Kolektor Etra | 5001 | 4201 | Slovenia; Serbia | — | — | — | 2026-11-11 |
| Meidensha | 5001 | 5001 | Japan; India; Singapore | — | — | Japan | 2026-11-11 |
| Wilson Power Solutions | 5001 | 4001 | United Kingdom; India | — | — | United Kingdom | 2026-11-11 |
| WEG | 4001 | 5001 | United States; Mexico | Yes | 772 | Brazil | 2026-11-11 |
| IMP Powers | 3151 | 4001 | India | — | — | — | 2026-11-11 |
| Indo Tech Transformers | 3151 | 4001 | India | — | — | — | 2026-11-11 |
| Howard Industries | 3005 | 3455 | United States | Yes | 236.952 | United States | 2026-11-11 |
| Shihlin Electric | 3001 | 3451 | Taiwan | — | — | — | 2026-11-11 |
| Voltamp Transformers | 2501 | 2204 | India | — | — | India | 2026-11-11 |
| Bharat Bijlee | 2001 | 2201 | — | — | — | — | 2026-11-11 |
| Delta Star | 2002 | 3452 | United States; Canada | Yes | — | United States | 2026-11-11 |
| IMEFY | 1601 | 2451 | Spain | — | — | — | 2026-11-11 |
| Matelec | 1251 | 2451 | Lebanon | — | — | — | 2026-11-11 |
| ZREW Transformatory | 1201 | 1451 | Poland | — | — | — | 2026-11-11 |
| Sanil Electric | 702 | 1702 | — | — | — | South Korea | 2026-11-11 |
| Shilchar Technologies | 501 | 1501 | India | — | — | — | 2026-11-11 |
| Hammond Power Solutions | 342 | 462 | Canada; Mexico | — | — | Canada | 2026-11-11 |
| CG Power (formerly Crompton Greaves) | — | 7651 | India | — | — | India | 2026-11-11 |
| China XD Electric | — | 1,1001 | China | — | — | China | 2026-11-11 |
| DAIHEN | — | 5001 | Japan | — | — | — | 2026-11-11 |
| Hitachi Energy | — | 8001 | United States; Canada; Germany; Finland; Poland; Colombia; China; Vietnam | Yes | 5283 | Switzerland | 2026-11-11 |
| ILJIN Electric | — | 5002 | South Korea | — | — | South Korea | 2026-11-11 |
| LS Electric | — | 5501 | South Korea | — | — | South Korea | 2026-11-11 |
How to read a power transformer rating
How we sourceMVA is the size, kV is the class
MVA sets how much power the unit carries; the voltage class sets which grid it can connect to and how big the insulation and tank get. Tamini’s phase-shifter throughput is a separate rating basis; its conventional power range reaches 900 MVA↗. The two rarely peak in the same product. HD Hyundai Electric publishes power transformers to 1,500 MVA and 800 kV, while its Alabama plant is adding 765 kV production with the second factory due in 2027↗.
GSU, autotransformer, HVDC
Generator step-up units lift plant output to transmission voltage, autotransformers tie two transmission voltages, and HVDC converter transformers feed the valve halls of DC links. TBEA and China XD build converter transformers to ±1,100 kV↗; Hitachi Energy has delivered more than twenty 800 kV UHVDC units↗.
Where they are built
Large power transformers ship by rail or heavy road from a handful of plants. The US plant list shows who builds on American soil, and the expansion list shows the factories coming online through 2029.