Exhibit 21.1
QUANTA SERVICES, INC. — SUBSIDIARIES LIST
The following is a list of the significant subsidiaries of Quanta Services, Inc. showing the place of incorporation or organization and the names under which each subsidiary does business. The names of certain subsidiaries are omitted as such subsidiaries, considered as a single subsidiary, would not constitute a significant subsidiary.
| Subsidiary/Doing Business As | State of Incorporation/Organization | |
| Advanced Technologies and Installation Corporation | Washington | |
| Telecom Network Specialist | ||
| Allteck Line Contractors (USA), Inc. | Washington | |
| Allteck Line Contractors, Inc. | British Columbia | |
| Austin Trencher, Inc. | Delaware | |
| Blair Park Services, LLC | Delaware | |
| Blair Park Services, LLC of Delaware | ||
| InfraSource Blair Park Services, LLC | ||
| Bradford Brothers, Incorporated | North Carolina | |
| BBI Bradford Brothers, Incorporated | ||
| Bradford Brothers, Inc. | ||
| Quanta Underground Services | ||
| Quanta Underground Services, Inc. | ||
| Quanta Underground | ||
| CCLC, Inc. | Delaware | |
| CMI Services, Inc. | Florida | |
| Florida CMI Services, Inc. | ||
| FL CMI Services, Inc. | ||
| CAN-FER Construction Company | Texas | |
| Conti Communications, Inc. | Delaware | |
| DE Conti Communications, Inc. | ||
| Croce Electric Company, Inc. | Delaware | |
| Dacon California | California | |
| Dacon, LLC | Delaware | |
| Dashiell California, Inc. | California | |
| Dashiell, LLC | Delaware | |
| Dashiell (DE), LLC | ||
| Digco Utility Construction, L.P. | Delaware | |
| Brown Engineering | ||
| Ranger Field Services | ||
| Dillard Smith Construction Company | Delaware | |
| E A Technical Services, Inc. | Georgia | |
| EHV Elecon, Inc. | Puerto Rico | |
| EHV Power ULC | Alberta | |
| Engineering Associates, Inc. | Georgia | |
| Five Points Construction Co. | Texas | |
| Global Enercom Management, Inc. | Delaware | |
| Golden State Utility Co. | Delaware | |
| H.L. Chapman Pipeline Construction, Inc. | Delaware | |
| DB Utilities |
| Subsidiary/Doing Business As | State of Incorporation/Organization | |
| Chapman Pipeline Construction, Inc., H.L. | ||
| Sullivan Welding | ||
| InfraSource Corporate Services, LLC | Delaware | |
| InfraSource Company Services, LLC | ||
| Quanta Technology | ||
| InfraSource Incorporated | Delaware | |
| InfraSource Maslonka CA, Inc. | California | |
| InfraSource-Maslonka, LLC | Delaware | |
| InfraSource Power California, Inc. | California | |
| InfraSource Services, Inc. | Delaware | |
| InfraSource Telecommunication Services, LLC | Delaware | |
| InfraSource Transmission Services Company | Arizona | |
| InfraSource Underground Construction, Inc. | Delaware | |
| IUC Michigan, Inc. | ||
| IUC Texas, Inc. | ||
| InfraSource Underground Construction, LLC | Delaware | |
| IUC Illinois, LLC | ||
| IUC Missouri, LLC | ||
| IUC Montana, LLC | ||
| IUC Nebraska, LLC | ||
| IUC North Dakota, LLC | ||
| IUC Washington, LLC | ||
| IUS Wisconsin, LLC | ||
| InfraSource Underground Construction California, Inc. | Delaware | |
| InfraSource Underground Construction Services, LLC | Delaware | |
| InfraSource Underground Installation, LLC | Delaware | |
| InfraSource Underground Services, LLC | Georgia | |
| IUS Underground, LLC | ||
| InfraSource Underground Services Canada, Inc. | Delaware | |
| Intermountain Electric, Inc. | Colorado | |
| Colorado IM Electric | ||
| Grand Electric | ||
| Irby Construction Company | Mississippi | |
| Lindsey Electric, L.P. | Texas | |
| Manuel Bros., Inc. | Delaware | |
| Renaissance Construction | ||
| Western Directional | ||
| Mechanical Specialties, Inc. | Virginia | |
| Mears Canada Corp. | Nova Scotia | |
| Mears Engineering/LLC | Michigan | |
| Mears Group, Inc. | Delaware | |
| Mears Services LLC | Michigan | |
| Mears/CPG LLC | Michigan | |
| Mears/HDD, LLC | Michigan | |
| Mearsmex S. de R.L. de C.V. | Mexico | |
| Mejia Personnel Services, Inc. | Texas | |
| Metro Underground Services, Inc. of Illinois | Illinois |
| Subsidiary/Doing Business As | State of Incorporation/Organization | |
| M.J. Electric, LLC | Delaware | |
| M.J. Electric, LLC Iron Mountain | ||
| M.J. Electric, Iron Mountain | ||
| InfraSource M.J. Electric, LLC | ||
| Iron Mountain M.J. Electric, LLC | ||
| M.J. Electric California, Inc. | California | |
| Network Electric Company | Delaware | |
| North Houston Pole Line, L.P. | Delaware | |
| North Sky Communications, Inc. | Delaware | |
| Sky Communications | ||
| Okay Construction Company, LLC | Delaware | |
| OSP Consultants, Inc. | Virginia | |
| PAR Electrical Contractors, Inc. | Missouri | |
| Computapole | ||
| Longfellow Drilling | ||
| Longfellow Drilling, Inc. | ||
| Riggin & Diggin Line Construction | ||
| Seaward | ||
| Seaward Corporation | ||
| PAR Internacional, S. de R.L. de C.V. | Mexico | |
| Parkside Site & Utility Company Corporation | Delaware | |
| Parkside Utility Construction Corp. | Delaware | |
| Pauley Construction Inc. | Arizona | |
| Potelco, Inc. | Washington | |
| Kingston Constructors | ||
| Kuenzi Construction | ||
| NorAm Telecommunications | ||
| Professional Teleconcepts, Inc. | Illinois | |
| Professional Teleconcepts of Illinois | ||
| Professional Teleconcepts, Inc. | New York | |
| Professional Teleconcepts of New York | ||
| NY Professional Teleconcepts | ||
| NY Professional Teleconcepts, Inc. | ||
| PWR Financial Company | Delaware | |
| PWR Network, LLC | Delaware | |
| QDE LLC | Delaware | |
| QPC, Inc. | Delaware | |
| QSI, Inc. | Delaware | |
| Quanta Asset Management LLC | Delaware | |
| Quanta Associates, L.P. | Texas | |
| Quanta Delaware, Inc. | Delaware | |
| Quanta Government Services, Inc. | Delaware | |
| Quanta Government Solutions, Inc. | Delaware | |
| Quanta International Limited | British Virgin Islands | |
| Quanta LX Acquisition, Inc. | Delaware | |
| Quanta LXI Acquisition, Inc. | Delaware | |
| Quanta LXII Acquisition, Inc. | Delaware |
| Subsidiary/Doing Business As | State of Incorporation/Organization | |
| Quanta LXIII Acquisition, Inc. | Delaware | |
| Quanta LXIV Acquisition, Inc. | Delaware | |
| Quanta LXV Acquisition, Inc. | Delaware | |
| Quanta LXVI Acquisition, Inc. | Delaware | |
| Quanta LXVII Acquisition, Inc. | Delaware | |
| Quanta LXVIII Acquisition, Inc. | Delaware | |
| Quanta LXIX Acquisition, Inc. | Delaware | |
| Quanta LXX Acquisition, Inc. | Delaware | |
| Quanta LXXI Acquisition, Inc. | Delaware | |
| Quanta LXXII Acquisition, Inc. | Delaware | |
| Quanta LXXIII Acquisition, Inc | Delaware | |
| Quanta Receivables, L.P. | Delaware | |
| Quanta Services Contracting, Inc. | Delaware | |
| Quanta Services Management Partnership, L.P. | Texas | |
| Quanta Services of Canada Ltd. | British Columbia | |
| Quanta Technology, LLC | Delaware | |
| Quanta Underground Services, Inc. | Delaware | |
| Quanta Utility Installation Company, Inc. | Delaware | |
| Quanta Utility Services — Gulf States, Inc. | Delaware | |
| Quanta Utility Services, LLC | Delaware | |
| Quanta Wireless Solutions, Inc. | Delaware | |
| QuantaWorks, LLC | Delaware | |
| R.A. Waffensmith & Co., Inc. | Delaware | |
| Realtime Engineers, Inc. | Delaware | |
| Realtime Utility Engineers, Inc. | Wisconsin | |
| Servicios Par Electric, S. de R.L. de C.V. | Mexico | |
| Southwest Trenching Company, Inc. | Texas | |
| Spalj Construction Company | Delaware | |
| Delaware Spalj Construction | ||
| Dot 05 Optical Communications | ||
| Driftwood Electrical Contractors | ||
| Fiber Technologies | ||
| Smith Contracting | ||
| Span-Con of Deerwood | ||
| Tjader & Highstrom | ||
| Thorstad Brother Tiling | ||
| Wilson Roadbores | ||
| Spectrum Construction Contracting, L.L.C. | Colorado | |
| Spectrum Builders | ||
| Sumter Utilities, Inc. | Delaware | |
| Sunesys, LLC | Delaware | |
| Sunesys, LLC of Delaware | ||
| Sunesys of Massachusetts, LLC | Delaware | |
| Sunesys of Virginia, Inc. | Virginia | |
| The Ryan Company, Inc. | Massachusetts | |
| Eastern Communications | ||
| The Ryan Company Inc. of Massachusetts |
| Subsidiary/Doing Business As | State of Incorporation/Organization | |
| The Ryan Company of Massachusetts | ||
| The Ryan Company Incorporated of Massachusetts | ||
| The Ryan Company Incorporated Electrical Contractors | ||
| Ryan Company Inc. (The) | ||
| Tjader, L.L.C. | Delaware | |
| Tom Allen Construction Company | Delaware | |
| TA Construction | ||
| Allen Construction Company, Tom | ||
| Total Quality Management Services, LLC | Delaware | |
| Trawick Construction Company, Inc. | Florida | |
| TTGP, Inc. | Delaware | |
| TTLP, Inc. | Delaware | |
| Underground Construction Co., Inc. | Delaware | |
| Delaware Underground Construction Co. | ||
| Maryland Underground Construction Co., Inc. | ||
| Underground Construction Co., Inc. (Delaware) | ||
| Utility Line Management Services, Inc. | Delaware | |
| Utility Locate & Mapping Services, Inc. | Virginia | |
| VCI Telcom, Inc. | Delaware | |
| VCS Sub, Inc. | California | |
| W.C. Communications, Inc. | Delaware | |
| West Coast Communications | ||
| Winco, Inc. | Oregon | |
| Winco Powerline Services, Inc. | ||
| Winco Powerline Services |