- LG Industrial Systems
Manufactures power transmission and distribution equipment, automation and control products, power tools, and tubes and pipes.
- Irby Construction Co.
Telecommunications and powerline contractors.
- Howard Industries, Inc.
Producer of distribution transformers.
- Burmeister & Wain Scandinavian Contractor
Specializing in the engineering, supply, construction, and commissioning of diesel engine-based power plants. Also offers power plant training.
- Post Glover Resistors Inc.
Manufactures heavy duty power resistors for motor control and neutral grounding.
- Waukesha Electric Systems
Producers of medium power transformers, substations, surge arresters, and providers of decommissioning/remanufacturing.
- Phenix Technologies
Manufacturer of high voltage, high current, and high power test systems and components.
- Belyea Company, Inc.
Supplying recycled electrical power systems.
- Brooks Manufacturing
Manufacturer of distribution crossarms and transmission structure framing material.
Worldwide manufacturer and provider of insulators for transmission and distribution lines, surge arresters, and hollow cores.
- Davis H. Elliot Companies, Inc.
Specializes in transmission and distribution line construction and repair, commercial and industrial electrical construction, and the design and manufacture of electric control panels.
- Renewable Energy Group
Provides turnkey biodiesel plants.
- Johnson Electric Supply Company
Wholesale distributor of electrical components and supplies.
- Northeast Power Systems, Inc.
Medium voltage switchgear, power factor correction, and harmonic filter equipment.
- EquiSales Associates, Inc.
Provides sales and installation of transformers, circuit breakers, power generation equipment, and switch yard equipment.
- Tucson Transformer & Apparatus
Offers surplus and remanufactured power, substation, and step-up transformers as well as switch gear, circuit breakers, and power distribution systems.
- Georgia Underground
Offers products and supplies for the underground and overhead utility construction industry.
- Tamco Corporate Holdings
Manufactures of low and medium voltage switchgears.
- GMG Engineering
Manufactures and retrofits switchgear and power distribution equipment for the electric power industry.
Engineering and construction firm specializing in steam and power generation projects.