Founded in Saint-Étienne in 1925, BERNARD BONNEFOND designs and manufactures specialized electrotechnical equipment, notably VARIVOLT variable-voltage transformers and low-speed alternators. Its history began with repairing electrical machines and transformers before expanding into manufacturing, and the company now supports industrial power applications with equipment renovation and custom electrical connections through its Amppelec subsidiary. In its centenary year, the company reports more than 2,000 VARIVOLT units and over 100 alternators in service worldwide.
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Staco Energy Products CompanySince manufacturing its first variable transformer in Dayton in 1937, Staco Energy Products Company has built power-quality and voltage-control equipment for critical electrical applications. The Miamisburg, Ohio manufacturer is described as the oldest and largest U.S. maker of variable transformers, and it continues to support equipment made as far back as 30 years ago. Staco also provides factory-trained service, including start-up, maintenance and repair support, for both current and legacy systems.MIAMISBURG, OH
IDEAL ELECTRIC COMPANYBorn in a converted Ohio carriage shop in 1903, IDEAL ELECTRIC makes high-power specialty motors, generators and rotating power equipment at its historic Mansfield works. The 100% American-owned company combines vertically integrated manufacturing with a large test floor and preserves the original designs needed to repair, remanufacture and upgrade IDEAL machines and other legacy equipment. Its machines serve customers in more than 100 countries, with capabilities reaching 50,000 horsepower and 50 MVA.MANSFIELD, OH
R.E. Uptegraff Manufacturing CompanySince 1925, Scottdale’s privately owned R.E. Uptegraff Manufacturing Company has built conventional and specially engineered transformers for industrial and utility customers, from 10 to 15,000 kVA. The company remains a custom engineered-to-order shop, pairing its 42-employee operation and 70,000-square-foot Pennsylvania facility with repair and refurbishment work on transformers of any make. Its history includes pioneering aluminum-wound transformers in 1966 and three generations of Uptegraff family ownership before the business became privately owned under different structure in 2014.SCOTTDALE, PA
Niagara Power TransformerFounded in 1924 as Erie Electric Corp., Buffalo-based Niagara Power Transformer manufactures liquid-filled power and special-application transformers for demanding conditions. The company has produced more than 75,000 transformers, serves customers in over 80 countries, and has expanded its production and engineering facilities with major investments in testing and winding capabilities. Now part of the Quanta Services family, Niagara marks its second century with ISO 9001:2015 certification and a focus on engineered-to-order power solutions.BUFFALO, NY