Since 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.
ISO 9001:2015
RoHS Compliant
Compliance program
ELSCO TransformersFounded in Cincinnati in 1912 as a transformer repair company, ELSCO Transformers now designs, hand-builds and stocks medium-voltage power transformers for industrial and commercial customers. Since building its own dry-type units in 1988, the five-generation, privately owned company has paired in-house engineering and testing with a 95% in-stock availability target, often shipping replacements within 24 to 48 hours. That repair heritage also shapes ELSCO’s retrofit, custom bus-work and emergency replacement support when a failed transformer threatens operations.CINCINNATI, OH
BERNARD BONNEFOND S.A.SFounded 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.TOLEDO, OH
ELSCO TransformersFounded in Cincinnati in 1912 as the first independent transformer repair facility in the United States, ELSCO Transformers now designs, hand-builds and stocks medium-voltage power transformers. The privately owned company remains operated by five generations of electrical engineers and electricians, with its copper-wound dry-type units built and tested under one roof. ELSCO is particularly known for quick-ship emergency replacements and retrofit transformers configured to fit existing electrical connections.CINCINNATI, OH
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