With roots in Ohio Transformer’s 1946 founding, OTC Services remanufactures and repairs dry-type and liquid-filled transformers for industrial and utility customers, while also designing and building new units. Its Northern Ohio operation occupies a 100,000-square-foot facility with direct rail access and a 100-ton overhead crane, supporting work that ranges from shop repairs to field service. OTC became part of the SGB-SMIT Group in 2012, linking its transformer work to a group with more than a century of design and manufacturing history.
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Northeast Transformer Services, LLCNortheast Transformer Services remanufactures and repairs medium-voltage, oil-filled distribution transformers at its Preble, New York factory. The company says it processes more than 10,000 transformer repairs annually and rebuilds transformers to new-unit quality standards, returning previously damaged or obsolete units to customers.PREBLE, NY
SGB-SMIT GroupFounded in 1913, SGB-SMIT Group is a European transformer specialist manufacturing equipment for generating and distributing electricity. The group operates 15 sites across three continents and eight countries, with about 3,800 employees supporting projects from industrial power systems to renewable generation. Its transformer service teams also diagnose, maintain and repair both SGB-SMIT and other manufacturers’ transformers internationally.LOUISVILLE, OH
Southwest Electric CoFounded in Oklahoma City in 1946 by three brothers as an electric-motor repair shop, Southwest Electric Co. now designs and manufactures transformers and custom switchgear while providing nationwide electrical field services. After joining the SGB-SMIT Group in 2025, the company operates as SGB-SMIT USA, pairing 75 years of Southwest Electric experience with a global transformer manufacturing network. Its motor operations can repair equipment weighing up to 100 tons, a reflection of the heavy-duty work behind its service offering.LOUISVILLE, OH
OTC Industrial TechnologiesSince 1963, OTC Industrial Technologies has grown from Ohio Transmission Corporation into a national industrial partner known for helping manufacturers keep equipment running. Based in Columbus, the company supports customers through 60 branches and a team of 2,000 associates, combining engineering experience with service and repair expertise for facilities across the United States.PITTSBURGH, PA