| Subsidiary | Jurisdiction of Incorporation | |||||||
| Aerial Lighting & Electric, Inc. | Connecticut | |||||||
| Arrow Engine Company | Delaware | |||||||
| Azimuth Communications, Inc. | Oregon | |||||||
Bayonet Plumbing, Heating & Air Conditioning, LLC | Florida | |||||||
| Calumet Armature and Electric, L.L.C. | Illinois | |||||||
Edmonson Electric, LLC | Florida | |||||||
| Four Point Dynamics, LLC | Delaware | |||||||
| Freeman Enclosure Systems, LLC | Ohio | |||||||
| Greiner Industries, Inc. | Pennsylvania | |||||||
| Hotchkiss Alarms, LLC | Connecticut | |||||||
| IES Commercial, Inc. | Delaware | |||||||
| IES Communications, LLC | Delaware | |||||||
| IES Consolidation, LLC | Delaware | |||||||
| IES Enclosure Solutions and Services, LLC | Delaware | |||||||
| IES FL RE, LLC | Florida | |||||||
| IES Infrastructure Solutions, LLC | Delaware | |||||||
IES Investments, LLC | Delaware | |||||||
| IES LA RE, LLC | Louisiana | |||||||
| IES Management LP | Texas | |||||||
IES OK RE, LLC | Oklahoma | |||||||
| IES Operations Group, Inc. | Delaware | |||||||
| IES PA RE, LLC | Delaware | |||||||
| IES Residential, Inc. | Delaware | |||||||
| IES SC RE, LLC | Delaware | |||||||
| IES Shared Services, Inc. | Delaware | |||||||
| IES Subsidiary Holdings, Inc. | Delaware | |||||||
| Integrated Electrical Finance, Inc. | Delaware | |||||||
K.E.P. Electric, Inc. | Ohio | |||||||
| Key Electrical Supply, Inc. | Texas | |||||||
| Magnetech Industrial Services, Inc. | Indiana | |||||||
| NEXT Electric, LLC | Wisconsin | |||||||
| Plant Power and Control Systems, L.L.C. | Alabama | |||||||
| Qypsys, LLC | Florida | |||||||
| Southern Industrial Sales and Services, Inc. | Georgia | |||||||
| Technibus, Inc. | Delaware | |||||||
| Thomas Popp & Company | Ohio | |||||||
Wedlake Fabricating, Inc. | Oklahoma | |||||||
| Wisconsin Heavy Fabrication, LLC | Delaware | |||||||