Form: 10-K

Annual report pursuant to Section 13 and 15(d)

February 23, 2023


Exhibit 21.1



Quanta Services, Inc.
Subsidiaries List

The following is a list of the subsidiaries of Quanta Services, Inc. showing the jurisdiction of incorporation or organization and the names under which each subsidiary does business (in italics). The names of certain subsidiaries may be omitted as such subsidiaries, considered as a single subsidiary, would not constitute a significant subsidiary.


Subsidiary and Names Under Which Subsidiary Does Business Jurisdiction of Incorporation or Organization
1 Diamond, LLC
Cutting Technology - 1 Diamond, LLC
Delaware
1Diamond AS Norway
618232 Alberta Ltd.
ValAir
Alberta
8246408 Canada Inc.
G-TEK
G-Vac
Quebec
Advanced Electric Systems, LLC
Advanced Utility Testing & Maintenance, LLC
Utility Testing & Maintenance, LLC
Delaware
Alexander Publications, LLC California
Allteck GP Ltd. British Columbia
Allteck Limited Partnership British Columbia
Allteck USA, LLC Delaware
American Eagle Ready Mix Utah, LLC Delaware
Arizona Trench Company, LLC Delaware
Arnett & Burgess Oil Field Construction Limited Alberta
Arnett & Burgess Pipeliners (Rockies) LLC Delaware
Arnett & Burgess Pipeliners Ltd. Alberta
B&N Clearing and Environmental, LLC Delaware
Banister Pipelines Constructors GP Ltd. British Columbia
Banister Pipelines Limited Partnership British Columbia
Blackbox Technologies International Texas
Blattner Canada, LLC Minnesota
Blattner Energy, LLC
Blattner Energy, PLLC
Minnesota
Blattner Holding Company, LLC
     Blattner Company
Minnesota
Blattner Investments, LLC Minnesota
Brent Woodward, Inc. Oregon
Brink Constructors, Inc.
Brink Constructors, Inc. A Corporation Of South Dakota
South Dakota
Cable Communication Services, LLC Delaware
Calico Real Properties, LLC Delaware
CanACRE (U.S.A.) Inc. Delaware
CanACRE (USA) Brokerage, Inc. Delaware
1


CanACRE Ltd. British Columbia
Canadian Utility Construction GP Ltd. British Columbia
Canadian Utility Construction Limited Partnership British Columbia
Carolina Power & Signalization, LLC Delaware
Catalyst Changers Inc. Alberta
Catalyst Changers Trinidad, ULC British Columbia
Cat-Spec, Ltd.
Cat Spec Limited, LP
Cat Spec, Ltd
CAT SPEC, Ltd.
Cat-Spec, Ltd., L.P.
Cat-Spec, Ltd., LP
Cat Spec, Ltd. L.P.
Cat Spec, Ltd., LP
Cat Spec., Ltd. LP
Cat-Spec Ltd, LP
CAT-SPEC, Limited Partnership
CAT-SPEC, Limited Partnership
CAT SPEC, Ltd. (Part Name)
Cat-Spec, Ltd (A Domestic limited Partnership)
Cat-Spec, Ltd. Limited Partnership
Texas
Citadel Industrial Services, Ltd.
Citadel Industrial Services, L.P.
Citadel Industrial Services, Ltd. Limited Partnership
Citadel Industrial Services, Ltd., L.P.
Texas
Clear Power Alaska Joint Venture, LLC Delaware
Coe Drilling Pty Ltd.
Coe Group
Mears Integrity Solutions
Australia
Conam Construction Co.
        Conam Construction Co., Inc.
Texas
Consolidated Power Projects Australia Pty Ltd
Conpower
Consolidated Power Industries
CPP Civil
Australia
Conti Communications, Inc. Delaware
Crux Subsurface Canada Ltd. British Columbia
Crux Subsurface, Inc. Delaware
D.H. Blattner & Sons, LLC Minnesota
Dacon Corporation Delaware
Dacon West, LLC Delaware
Dashiell Corporation
Dashiell (DE) Corporation (Dashiell Corporation)
Dashiell Corporation DBA Dashiell (DE) Corporation
Dacon Corporation
Delaware
Dashiell MI Corporation Delaware
Dashiell West, LLC Delaware
Digco Utility Construction, L.P.
Digco Utility Construction Limited Partnership
Delaware
DOD Fueling Contractors Pty Ltd. Australia
2


Dorado Specialty Services, Ltd.
Dorado Specialty Services, L.P.
Dorado Specialty Services, Ltd. L.P.
Dorado Specialty Services. Ltd., L.P.
Texas
EHV Power ULC British Columbia
Elite Construction of Ocala, LLC Delaware
Elite Fabrication, Ltd.
Elite Fabrication, LP
Texas
Elite Piping & Civil, Ltd.
Elite Piping & Civil Limited Partnership
Elite Piping & Civil Ltd, L.P.
Elite Piping & Civil, Limited Partnership
Elite Piping & Civil, Ltd. Limited Partnership
Elite Piping & Civil, Ltd., L.P.
Elite Piping and Civil, L.P.
Texas
Elite Turnaround Specialists, Ltd.
Elite Turnaround Specialists Limited Partnership
Elite Turnaround Specialists Limited Lp
Elite Turnaround Specialists Ltd. L.P.
Elite Turnaround Specialists, L.p.
Elite Turnaround Specialists, Limited Partnership
ELITE TURNAROUND SPECIALISTS, LTD
Elite Turnaround Specialists, Ltd, Lp
Elite Turnaround Specialists, Ltd. Limited Partnership
Elite Turnaround Specialists, Ltd., LP
Elite Turnaround Specialists, Ltd. Limited Partnership (Elite Turnaround Specialists, Ltd.)
Texas
Energy Services West, LLC Delaware
Enscope Pty Ltd Australia
FiberTel, LLC
Fibertel Communications
Utah
FIC GP, LLC Delaware
Field Personnel Services, LLC
      Field Personnel Services LLC
Delaware
First Infrastructure Capital Advisors, LLC Delaware
First Infrastructure Capital GP, L.P. Delaware
Five Points Construction Co. Texas
Flare Construction, LLC
Flare Construction, Inc.
Utah
Fleet Services West, LLC Delaware
Grid Manufacturing Corporation
Northwest Lineman College
Idaho
Grid Training Corporation
Northwest Lineman Center
Northwest Lineman College
Idaho
H.L. Chapman Pipeline Construction, Inc. Delaware
Hallen Integrated Construction Services, LLC Delaware
Haverfield International Incorporated
Haverfield Aviation
Haverfield Aviation, Inc.
Delaware
HBK Engineering, LLC
HBK Engineering, PLLC
Illinois
3


Helibro, LLC California
Heritage Midstream, LLC Delaware
Infraestructura ETP de Mexico, S. de R.L. de C.V Mexico
InfraSource Construction, LLC
Infrasource Iowa Underground, LLC
InfraSources Construction, LLC
IUC ILLINOIS, LLC
IUC Nebraska, LLC
QS Mats
Trans Tech Electric
Delaware
Infrasource Electric, LLC Delaware
InfrasSource Pipeline Construction, LLC Delaware
InfraSource Services, LLC Delaware
Infrastructure Tackle & Supply, LLC Delaware
Innoversa Mobile Solutions GP Ltd. British Columbia
Innoversa Mobile Solutions Limited Partnership British Columbia
Innoversa Mobile Solutions, LLC Delaware
Intermountain Electric, Inc.
Grand Electric Inc.
IM Electric, Inc.
Ime Electric
Intermountain Electric, Inc. which will do business in California as: Colorado IM Electric
Intermountain Electric, Inc., A Corporation of Colorado
Colorado
Irby Construction Company
Irby Construction Company, Inc.
Legend Foundation Services
Marathon Construction Services
Mississippi
Irbyvalard, LLC Delaware
Island Mechanical Corporation Hawaii
J&R Underground LLC Wisconsin
J.C.R. Construction Co., Inc.
J.C.R. Utility Construction Co.
New Hampshire
J.W. Didado Electric, LLC Delaware
JBT Electric, LLC Texas
Lazy Q Ranch, LLC
DE Lazy Q Ranch, LLC
(De) Lazy Q Ranch, LLC
Lazy Q Line School
Lazy Q Line School, LLC
Delaware
Lee Electrical Construction, LLC
Lee Utilities, Inc.
North Carolina
Lex Engineering Ltd. British Columbia
Lindsey Electric, L.P. Texas
4


M. J. Electric, LLC
Great Lakes Line Builders
Iron Mountain M.J. Electric, LLC
IRON POWER SERVICES, A DIVISION OF M. .J ELECTRIC
Iron Power Services
Iron Power Services, A Division of M.J. Electric, LLC
M. J. Electric, LLC – Iron Mountain
M. J. Electric, LLC DBA M. J. Electric Iron Mountain, LLC
M. J. ELECTRIC, LLC IRON MOUNTAIN
M.J. Electric, LLC DBA M.J. Electric Iron Mountain
M.J. Electric, LLC Iron Mountain
MJ Drilling, A Division of M. J. Electric
MJ Drilling, A Division of M. J. Electric, LLC
MJ Excavating, A Division of M.J.Electric, LLC
Process Controls & Instrumentation
Process Controls & Instrumentation, A Division of M. J. Electric, LLC
Delaware
M.G. Dyess, LLC Mississippi
MATG I, LLC Delaware
Mears Canada Corp. Nova Scotia
Mears Electric, LLC Delaware
Mears Equipment Services, LLC
Infrasource Of Pa, LLC
Mears Equipment Service, LLC
QPS Global Services
Delaware
Mears Group Pty Ltd Australia
Mears Group, Inc.
De Mears Group
De Mears Group, Inc.
Enscope
Ranger Directional
Delaware
Mears Holdings, LLC
        Mears Holdings Ny, LLC
        TN Mears Holdings, LLC
Delaware
Mears Installation, LLC Delaware
Mearsmex S. de R.L. de C.V. Mexico
Mejia Personnel Services, LLC Texas
Mid America Energy Services, Inc.
TA Construction
Tom Allen Construction Company Inc.
Tom Allen Construction Company of Delaware
Delaware
MTS Quanta, LLC
Mercer Technical Services
MTS Field Services
MTS Field Services (Richmond Co)
Texas
NACAP Niugini Ltd. Papua New Guinea
Nacap PNG Limited Papua New Guinea
Nacap Pty Ltd. Australia
NLC CA., Inc.
NORTHWEST LINEMAN COLLEGE
Idaho
NLC FL., Inc.
Northwest Lineman Center
Idaho
NLC ID., Inc.
Northwest Lineman College
Idaho
5


NLC TX., Inc.
Northwest Lineman Center
Northwest Lineman Training Center
Northwest Lineman Training Center, Inc.
Idaho
North Houston Pole Line, L.P.
North Houston Pole Line Limited Partnership
QUANTA FOUNDATION SERVICES
Texas
Northern Powerline Constructors, Inc.
Chatham Electric
Alaska
NorthStar Energy Services, Inc.
NC Northstar Energy Services, Inc
Quanta Underground Services
Quanta Underground Services (Culpeper Co)
Quanta Underground Services (Spotsylvania Co)
Quanta Underground Services, Inc.
North Star Energy, LLC
North Carolina
Northstar Energy Solutions, LLC
Northstar Energy, LLC
Delaware
Nova Constructors LLC Japan
Nova Equipment Leasing, LLC Washington
Nova Group, Inc.
NGI Construction
NGI Construction, Inc.
NGI Construction, Inc. (FN)
Nova Group, Inc
Nova Group, Inc (CA)
Nova Group, Inc. DBA NGI Construction
California
Nova NextGen Solutions, LLC Delaware
NPC Energy Services LLC Alaska
O. J. Pipelines Canada Corporation
OJ Industrial Maintenance
O.J. Pipelines Canada
New Brunswick
O. J. Pipelines Canada Limited Partnership Alberta
P.J. Helicopters, Inc. California
PAR Electrical Contractors, LLC
Didado Utility Company, Inc.
J.W. Didado Electric
J.W. Didado Electric, Inc.
Longfellow Drilling
Seaward Corp
QUES
Missouri
Par Internacional, S. de R.L. de C.V. Mexico
PAR Western Line Contractors, LLC
QUES
Utility Line Management Services
Delaware
Performance Energy Services Guyana, Ltd. British Virgin Islands
Performance Energy Services, L.L.C.
Fuzion Specialty Turnarounds And Piping
FUZION SPECIALTY TURNAROUNDS AND PIPING
Louisiana
Phasor Engineering Inc. Alberta
 Phasor Engineering, LLC
Delaware
Phasor Geomatics, Ltd. Alberta
Phoenix North Constructors Inc. British Columbia
6


Phoenix Power Group, Inc. Delaware
Potelco, Inc.
Potelco, Incorporated
Washington
Price Gregory International, LLC Delaware
Price Gregory Services, LLC Delaware
Probst Electric, Inc.
Advanced Electric Systems
Probst Construction, Inc.
Utility Fleet Services
Utah
QES GP, LLC Delaware
QESC GP Ltd. British Columbia
QPS Engineering, LLC
QPS Engineering PLLC
QPS Environmental
QPS Global
QPS Global Services
QPS Global Services (Richmond Ci)
QPSE
Delaware
QPS Flint, LLC
QPS Flint Construction
QPS Flint Tank Services
QPS Professional Services
Quanta Environmental Solutions
Quanta EPC Services
Quanta Tank Services
Delaware
QSI Engineering, Inc. Delaware
QSI Finance (Australia) Pty Ltd. Australia
QSI Finance (Cayman) Pvt. Ltd. Cayman Islands
QSI Finance Canada ULC British Columbia
QSI Finance GP (US), LLC Delaware
QSI Finance I (US), LP Delaware
QSI Finance II (Australia) Pty Ltd. Australia
QSI Finance II (Lux) S.à r.l Luxembourg
QSI Finance III (Canada) ULC British Columbia
QSI Finance III (Lux) SARL Luxemburg
QSI Finance IV (Canada) ULC British Columbia
QSI Finance IX (Canada) Limited Partnership British Columbia
QSI Finance V (US), L.P. Delaware
QSI Finance VI (Canada) ULC British Columbia
QSI Finance VII (Canada) Limited Partnership British Columbia
QSI Finance VIII (Canada) ULC British Columbia
QSI Finance X (Canada) ULC British Columbia
QSI Holdings I (Singapore) Pte. Ltd. Singapore
QSI Holdings II (Singapore) Pte. Ltd. Singapore
QSI Investment AR, LLC Delaware
QSI Investment KORE, LLC Delaware
QSI Investment VFD, LLC Delaware
QSI Investment West, LLC Delaware
QSI Investment, LLC Delaware
QSI Management, LLC Delaware
7


QSI, Inc.
De Qsi Inc.
Qsi, Inc. Of Delaware
CA-QSI, Inc.
DE QSI INC
Delaware
QSN Lux Holdings I SCSp Luxembourg
QSN Lux Holdings II SCSp Luxembourg
QSN Lux Holdings III SCSp Luxembourg
QSN Lux Holdings IV SCSp Luxembourg
Quanta Asset Management LLC Delaware
Quanta Associates, L.P. Texas
Quanta Aviation Equipment Company, LLC Delaware
Quanta Aviation Services, LLC Delaware
Quanta Canada GP ULC British Columbia
Quanta Canada Holdings III Limited Partnership British Columbia
Quanta Canada Holdings LP Alberta
Quanta Canada III GP Ltd. British Columbia
Quanta Capital GP, LLC Delaware
Quanta Capital LP, L.P. Delaware
Quanta Capital Solutions, LLC Delaware
Quanta Cares Texas
Quanta East, LLC Delaware
Quanta Electric Power Services West, LLC Delaware
Quanta Electric Power Services, LLC Delaware
Quanta Energized Innovations Ltd. British Columbia
Quanta Energized Services of Canada Limited Partnership British Columbia
Quanta Energized Services U.S., LLC Delaware
Quanta Energy Services, LLC Delaware
Quanta Equipment Company Canada GP Ltd. Alberta
Quanta Equipment Company Canada Limited Partnership Alberta
Quanta Equipment Company, LLC
Qec, LLC
Delaware
Quanta Government Solutions, Inc. Delaware
Quanta Infraestructura de Chile SpA Chile
Quanta Infrastructure Holdings, LLC Delaware
Quanta Infrastructure Services, LLC Delaware
Quanta Infrastructure Services, S. de R.L. de C.V. Mexico
Quanta Infrastructure Solutions Group, LLC
Iron Power Services
QEPC
Timken Power Systems GS
Quanta Electric Power Construction, LLC
Delaware
Quanta Inline Devices, LLC Texas
Quanta Insurance Company, Inc. Texas
Quanta International Holdings (US) LLC Delaware
Quanta International Holdings II, Ltd. British Virgin Islands
Quanta International Holdings IV, Ltd. British Virgin Islands
Quanta International Holdings V Ltd. British Virgin Islands
Quanta International Holdings VI Ltd. British Virgin Islands
Quanta International Holdings VII, Ltd. British Virgin Islands
8


Quanta International Holdings, Ltd. British Virgin Islands
Quanta International Limited British Virgin Islands
Quanta Lines Pty Ltd. Australia
Quanta Marine Services, LLC Delaware
Quanta Mountain West, LLC Delaware
Quanta Power Australia Pty Ltd Australia
Quanta Power Delivery, LLC Delaware
Quanta Power Generation, Inc. Delaware
Quanta Power Solutions India Private Limited India
Quanta Services Australia Pty Ltd. Australia
Quanta Services Chile SpA Chile
Quanta Services Colombia S.A.S. Colombia
Quanta Services Costa Rica, Ltda. Costa Rica
Quanta Services Guatemala, Ltda. Guatemala
Quanta Services International Holdings II Limited Partnership British Columbia
Quanta Services International Holdings LP Alberta
Quanta Services Management Partnership, L.P. Texas
Quanta Services Netherlands B.V.
Quanta Energized Services Europe
Quanta Services Netherlands B.V.
Quanta Technology Europe
Netherlands
Quanta Services of Canada Ltd. British Columbia
Quanta Services Peru S.A.C. Peru
Quanta Services Puerto Rico Holdings, LLC Delaware
Quanta Services Solutions PR, LLC
Quanta Services Puerto Rico
Puerto Rico
Quanta Services STPR, LLC
Quanta Services Puerto Rico
Puerto Rico
Quanta Subsurface Canada, Ltd. British Columbia
Quanta Technology Canada ULC British Columbia
Quanta Technology UK Ltd. United Kingdom
Quanta Technology, LLC
Delaware Quanta Technology, LLC
Delaware
Quanta Tecnología do Brasil Ltda. Brazil
Quanta Telecommunication Solutions, LLC
Quanta Telecom
Quanta Telecom Services
Quanta Telecommunication Services
Quanta Telecommunications Services, LLC
Delaware
Quanta Utility Installation Company, Inc. Delaware
Quanta Utility Operations PR, LLC Puerto Rico
Quanta Utility Operations, LLC Delaware
Quanta West, LLC Delaware
Quanta Workforce Solutions, LLC Delaware
R. R. Cassidy, Inc. Louisiana
Realtime Engineers, Inc. Delaware
Realtime Utility Engineers, Inc.
Infrasource Engineering Company, PC
Wisconsin
Redes Andinas de Comunicaciones S.R.L. Peru
9


RMS Holdings, LLC
RMS Holdings, LLC (Delaware)
RMS Welding Systems
Rms Welding Systems LLC
RMS Welding Systems LLC
RMS Welding Systems, LLC
Rms Welding, LLC
RMS Welding Systems LLC (Used in VA By: RMS Holdings, LLC)
RMS Welding Systems, LLC (RMS Holdings, LLC)
Delaware
Road Bore Corporation Hawaii
Robinson Brothers Construction, LLC
Robinson Brothers Construction, LLC A Limited Liability Company of Delaware
Delaware
RP Construction Services, LLC Delaware
Service Electric Company
P.D.G. Electric
Service EC (DE), Inc.
Service Electric Company (DE)
Service Electric Company of Delaware
Service Electric Company Of Delaware
Service Electric Company, Inc.
Delaware
Servicios de Infraestructura del Peru S.A.C. Peru
Servicios Par Electric, S. de R.L. de C.V. Mexico
Southern Electric Corporation of Mississippi Mississippi
Southwest Trenching Company, Inc. Texas
Specialty Tank Services, Ltd.
Specialty Tank Services Limited Partnership
Specialty Tank Services, L.P.
Specialty Tank Services, Limited Partnership
Specialty Tank Services, LP
Specialty Tank Services, Ltd. (LP)
Specialty Tank Services, Ltd. Limited Partnership
Specialty Tank Services, Ltd. LP
Specialty Tank Services, Ltd., L.P.
Specialty Tank Services, Ltd., LP
Texas Specialty Tank Services, Ltd. LP
Specialty Tank Services, Ltd., LP (Used in VA by: Specialty Tank Services, Ltd.)
Texas
Stronghold General, LLC Texas
Stronghold Holdings (BVI) Limited British Virgin Islands
Stronghold Inspection, Ltd.
Stronghold Inspection Limited Partnership
Stronghold Inspection Ltd, L.P.
Stronghold Inspection, L.P.
Stronghold Inspection, Limited Partnership
Stronghold Inspection, Ltd. Limited Partnership
Stronghold Inspection, Ltd., L.P.
Stronghold Inspection, L.P. (Fict Name) Stronghold Inspection, Ltd. (Part Name)
Stronghold Inspection, Ltd., L.P. (Used in VA By: Stronghold Inspection, Ltd.)
Texas
Stronghold Specialty General, LLC Texas
Stronghold Specialty, Ltd.
Stronghold Specialty, Ltd. Limited Partnership
Texas
10


Stronghold Tower Group, Ltd.
Stronghold Tower Group, LP
Stronghold Tower Group, Ltd, LP
Stronghold Tower Group, Ltd., LP
Texas
Stronghold VI, LLC U.S. Virgin Islands
Stronghold, Ltd.
Stronghold Management Holdings, LP
Stronghold, Limited Partnership
Stronghold, Ltd. Limited Partnership
Texas
Summit Line Construction, Inc.
Summit Line Construction
Utah
Sumter Utilities, Inc. Delaware
T. G. Mercer Consulting Services, Inc. Texas
TC Infrastructure Services Ltd. British Columbia
The Aspen Utility Company, LLC
The Aspen Utility Company, LLC
Texas
The ComTran Group, Inc. Georgia
The Hallen Construction Co., Inc. New York
The Ryan Company, Inc.
Ryan Company, Inc. of Massachusetts
Ryan Company, Inc.(The)
Ryan Company, Inc., The
The Massachusetts Ryan Company, Inc.
The Ryan Company Inc Of Massachusetts
The Ryan Company Inc of Massachusetts
The Ryan Company Inc. of Massachusetts
The Ryan Company Incorporated of Massachusetts
The Ryan Company Incorporated Of Massachusetts
The Ryan Company Of Massachusetts, Inc.
The Ryan Company of Massachusetts
The Ryan Company of Massachusetts (FN)
The Ryan Company of Massachusetts, Inc.
The Ryan Company, Inc. (Massachusetts)
The Ryan Company, Inc. of Massachusetts
The Ryan Company, Incorporated Electrical Contractors
Massachusetts
TurnKey Automation, Ltd.
TurnKey Automation Limited Partnership
TurnKey Automation, Limited Partnership
Turnkey Automation, Ltd. L.P.
TurnKey Automation, Ltd. Limited Partnership
TurnKey Automation, Ltd., Limited Partnership
TurnKey I&E, Ltd.
Texas
Underground Construction Co., Inc.
Delaware Underground Construction Co.
Ucc - Underground Construction Co.
UCC Underground Construction Co., Inc.
Underground Construction Co., Inc. (Delaware)
Delaware
Underground Electric Construction Company, LLC Delaware
Valard Construction (Quebec) Inc. Quebec
Valard Construction 2008 Ltd. Alberta
Valard Construction Australia Pty Ltd. Australia
Valard Construction LP Alberta
11


Valard Construction, LLC
Valard
Delaware
Valard Equipment GP Ltd. Alberta
Valard Equipment Limited Partnership Alberta
Valard Geomatics BC, Ltd. British Columbia
William E. Groves Construction, LLC
        Groves Electrical Services
Kentucky
Winco, Inc.
Winco Powerline Services
Winco Powerline Services Inc.
Winco Powerline Services, Inc.
Winco, Inc. an Oregon Based Corporation
Winco, Inc. D/B/A Winco Powerline Services
Winco, Inc. DBA Winco Services Inc.
Winco Helicopters
Oregon

12