| | | | | | | | |
| Name of Subsidiary | | Incorporated |
| Powell Industries, Inc. | | Delaware |
| Powell Electrical Systems, Inc. | | Delaware |
| Powell Industries International, Inc. | | Delaware |
| Powell Industries International Limited | | United Kingdom |
| Powell (UK) Limited | | United Kingdom |
| Remsdaq Limited | | United Kingdom |
| Powell Industries Asia, Pte, Ltd. | | Singapore |
| Powell Canada Inc. | | Canada |
| Powell Infinity Corporation | | Alberta |
| Powell Industries International B.V. | | Netherlands |
| Powell International B.V. | | Netherlands |
| Powell Canada B.V. | | Netherlands |
| Powell (Middle East) B.V. | | Netherlands |
| Powell B.V. | | Netherlands |
| Powell Equipment (Mexico) SA de CV | | Mexico |
| Powell Trading (Mexico) SA de CV | | Mexico |