Exhibit 21.1

SUBSIDIARIES OF POWELL INDUSTRIES, INC.

Name of Domestic Subsidiary
Delta-Unibus Corp.
Powell Electrical Manufacturing Co.
     Powell Power Electronics Company, Inc.
Powell-Process Systems, Inc. (Inactive)
Powell-ESCO Company
Unibus, Inc.
Powell Energy Systems Inc. (Inactive)
Transdyn Controls, Inc.
Traction Power Systems, Inc.

Name of Foreign Subsidiary
Powell Foreign Sales Corporation State of Incorporation
Illinois
Delaware
Delaware
Utah
Texas
Ohio
Nevada
California
Delaware

Country of Incorporation
Barbados, West Indies