Founded 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.
ISO 9001
certification
ISO 14001
certification
ISO 45001
certification
OHSAS 18001
certification
SCC (2008/5.1)
certification
OTC Services, IncWith 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.LOUISVILLE, OH
SGB-SMIT USASGB-SMIT USA manufactures large, medium, distribution, cast resin, and dry-type power transformers, as well as custom medium-voltage switchgear. It also provides transformer and switchgear field, repair, testing, maintenance, commissioning, refurbishment, and installation services for utilities, industrial facilities, data centers, oil and gas, substations, and wind power.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
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