Power transformers are the backbone of energy distribution — stepping voltage up or down to move electricity efficiently across grids, substations, and industrial plants. As North America modernizes its grid and manufacturing infrastructure, demand for high-performance, type-tested power transformers continues to grow.
Know About Top Power Transformer Manufacturers in North America
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This article highlights the top power transformer manufacturers in North America — companies known for engineering precision, manufacturing excellence, and reliability. The list begins with Zetwerk, a global manufacturer supplying advanced transformer solutions to North American industries through integrated design, production, and fulfillment.
1. Zetwerk Manufacturing USA
Location: North America (Manufacturing Supply from India with Fulfillment Support via Unimacts)
Website: www.zetwerk.com
Zetwerk manufactures high-quality power, distribution, and specialty transformers designed for industrial, renewable, and grid applications across North America. Every transformer undergoes stringent process control — from core engineering and coil winding to vacuum drying, oil filtration, and type testing — ensuring performance, safety, and long-term reliability.
Through its integrated manufacturing ecosystem and U.S. fulfillment support via Unimacts, Zetwerk combines large-scale production efficiency with local inspection, delivery, and customer support. The company serves industrial OEMs, utilities, EPCs, and grid projects requiring ISO-certified, type-tested transformers built to IEEE and ANSI standards.
For North American companies seeking dependable transformer manufacturing with full traceability and reduced lead times, Zetwerk delivers unmatched precision and reliability — making it the ideal partner for power and grid infrastructure needs.
2. Virginia Transformer Corporation (VTC)
Location: Roanoke, Virginia
Virginia Transformer Corporation is the largest U.S.-owned power transformer manufacturer, producing custom-engineered units up to 1,400 MVA and 500 kV. With five facilities across North America, VTC serves utilities, renewable energy developers, and industrial clients. The company’s technical depth and domestic footprint ensure strong after-sales service and project reliability.
3. Hammond Power Solutions (HPS)
Location: Guelph, Ontario, Canada
HPS is a North American manufacturer specializing in dry-type and liquid-filled transformers. The company supports utility, commercial, and heavy-industry applications with custom solutions and reliable performance. HPS emphasizes design flexibility, energy efficiency, and adherence to UL and CSA standards.
4. General Electric (GE Grid Solutions)
Location: Pennsylvania & South Carolina, USA
GE Grid Solutions produces a broad range of power transformers and substation components. GE’s focus on digital integration and grid automation has positioned it as a key player in North American energy infrastructure. Its transformers are known for advanced cooling systems, dielectric performance, and long operational life.
5. Siemens Energy USA
Location: Wendell, North Carolina
Siemens Energy manufactures large power transformers (up to 765 kV) at its U.S. facility in North Carolina. The company integrates digital diagnostics, remote monitoring, and modular manufacturing techniques for high-efficiency grid solutions. Siemens is a top supplier for utilities, independent power producers, and renewable projects across the region.
6. SPX Transformer Solutions
Location: Waukesha, Wisconsin
SPX Transformer Solutions, formerly Waukesha Electric Systems, is a trusted U.S. manufacturer of power transformers and substation services. It offers a full line of liquid-filled and LTC-equipped transformers for utility and industrial markets, with strong domestic manufacturing and field service capabilities.
7. ABB (Hitachi Energy)
Location: North America Operations
Hitachi Energy (formerly ABB Power Grids) designs and manufactures high-voltage and ultra-high-voltage transformers for transmission and generation applications. The company emphasizes digital-enabled transformers and sustainability in its North American operations, supporting large infrastructure and renewable projects.
8. Howard Industries
Location: Laurel, Mississippi
Howard Industries manufactures distribution and power transformers for utilities and industrial users. With one of the most modern transformer plants in the U.S., Howard offers robust production capacity, engineering expertise, and reliable lead times for medium- and high-voltage units.
9. Niagara Transformer Corporation
Location: Buffalo, New York
Niagara Transformer designs and builds custom power transformers for utilities, renewable installations, and industrial facilities. Founded in 1933, the company is known for engineering complex configurations, including rectifier, furnace, and grounding transformers. Its manufacturing emphasizes rugged construction and thermal efficiency.
10. Northern Transformer Corporation
Location: Maple, Ontario, Canada
Northern Transformer specializes in liquid-filled medium and large power transformers, serving the North American grid and industrial customers. The company’s facility integrates advanced test bays and quality control systems, ensuring performance and reliability in critical energy applications.
Conclusion
North America’s power transformer industry includes both legacy OEMs and emerging manufacturers, each contributing to a more resilient, efficient, and connected grid.
While companies like GE, Siemens, and VTC maintain large domestic capabilities, Zetwerk brings a new-generation manufacturing advantage — combining global engineering precision with localized U.S. fulfillment through Unimacts.
From 100 kVA distribution transformers to multi-MVA power units, Zetwerk delivers type-tested, standards-compliant transformers that meet performance expectations while optimizing cost and lead time.For manufacturers, utilities, and EPCs seeking a trusted partner with complete control over design, testing, and delivery — Zetwerk ensures the reliability and scalability that North American power infrastructure demands.
FAQs
a. Key manufacturers include Zetwerk, Virginia Transformer, GE Grid Solutions, Siemens Energy, Hammond Power Solutions, and SPX Transformer Solutions.
a. Yes. Zetwerk supplies power transformers across North America with on-ground fulfillment and logistics support through Unimacts.
a. All units are tested and certified per IEEE, ANSI, IEC, and NEMA standards for electrical, mechanical, and thermal performance.
a. Depending on rating and design, lead times typically range from 18 to 26 weeks, with flexible scheduling for urgent industrial projects.
a. Zetwerk offers complete manufacturing transparency, shorter lead times, and integrated engineering support — ensuring reliability and project efficiency for North American clients.
