- E & J DeMark
- E-Oil Solutions
- EA Technology Ltd.
- Eaton Corporation
- EC Insulators Shanghai Co., Ltd
- Eco-Electrical Systems, LLC
- ECP Utility
- EDM International, Inc.
- Efacec ACS
- Efacec Power Transformers
- Efacec USA
- Eger Products, Inc.
- EJ
- Electric Energy Online
- Electric Motion Company
- Electric Power Systems
- Electrical Consultants, Inc. (ECI)
- ELECTRICAS BC
- Electro Composites, a Division of Hubbell Power Systems
- Electro Industries/GaugeTech
- Electro Rent Corporation
- Electrocon International, Inc.
- Electrofocus Electricals Pvt. Ltd
- Electromark Company
- Electroswitch
- Elliott Industries, Inc.
- Elliott Molding & Components, a division of Elliott Industries, Inc.
- ELSPEC North America
- EMA Electromechanics, LLC
- EMB GmbH
- EMC Pacific
- Emelec Elektrik Muhendislik San.Tic.A.S
- EMID
- Emjakpower / FUSS
- EMTP-RV
- En-Liang Enterprise Co,.Ltd
- Enercon Services
- Energy Maintenance Technologies
- EnerNex
- Enerscan Engineering Inc.
- EnerSys
- Enervac Corporation
- ENOSERV
- Entec Electric & Electronic Co., Ltd.
- EPRI - Power Delivery Group
- Equisales Associates
- Erasmus LLC
- Ergon, Inc.
- ERICO, Inc.
- Eritech, a Division of Erico, Inc.
- ERLPhase Power Technologies
- Ermco, Inc.
- Esri
- Essex Brownell
- ETAP
- Eternal Sun Steel Mast (Shanghai) Co,. Ltd.
- Exel International
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