Transformer Manufacturing Association of America

Siemens Energy transformer manufacturing is well-known and acknowledged for our high-quality standards. With more than a century of experience and continual research and development, we manufacture power transformers in 13 factories around the world including our coming expansion in Charlotte, North Carolina.

Northern Transformer Corporation is a leading Canadian manufacturer of utility power transformers, providing tailored solutions to our clients’ unique requirements and delivering exceptional performance and long-term reliability in our clients’ power networks.  Since 1981, we have lived by our motto:  “Quality you can count on from people you can talk to!”

At Delta Star, we’ve set our sights on being the leading transformer manufacturing and substation services company in the industry, and one that continuously improves the performance, delivery and reliability of power to meet the energy needs of the future.

The Complete Transformer Solutions Partner: Known worldwide as the leading expert for (LTC) TAPCHANGERS, Reinhausen also provides premium solutions including TRANSFORMER SERVICES, Life Extension Strategies such as RETROFITS, MESSKO Sensors & Components, while continuing to lead with innovations for automation and digitalization like ETOS, embedded transformer operating system. Reinhausen empowers the US to maintain and extend the life of transformers while providing for grid stability and reliability.

For over 100 years, Niagara Power Transformer has produced special application and medium power transformers for service in the most extreme conditions and demanding applications anywhere in the world.

Since 1929, Pennsylvania Transformer has been a leader in building the US electric grid. Our long legacy of supplying high-quality, long-lasting power transformers continues under the Quanta Services umbrella.

We at Virginia Transformer are transforming power for America as  the largest U.S.-owned manufacturer of transformers in North America with more than  five decades of experience in the custom design and manufacturing of power transformers

Prolec GE, a Prolec subsidiary of a joint venture between GE and Xignux, a Mexico-based private company, is an electric industry leader in the Americas with six manufacturing facilities strategically located in Mexico, the United States, and Brazil and an installed product base in more than 35 countries. Its broad power transformer services offering in the U.S., as well as its wide variety of transformer components, complement Prolec GE’s full line of transformer solutions for the generation, transmission, and distribution of electrical energy for utilities, co-ops, municipalities, renewable project developers and original equipment manufacturers.

JFE Shoji is one of the largest processors and part producers for electrical steel products globally.  Owned by JFE Holdings (Japan), and along with JFE Steel, global electrification relies on our products.  We have a long and proud history in North America and are one of the largest suppliers of electrical steel cores to North American power and distribution transformer OEMs.

At Rea Magnet Wire, we power the world – at work, at home, and on the road.  As a leading supplier of magnet wire and nonferrous metals, we’ve earned a reputation for providing an exceptional customer experience and first-class quality & collaboration.

As world-leading supplier of transformer production equipment, GEORG is a proud member of TMAA helping the transformer manufacturers to enhance and improve their production capacities and technologies.