Document:

Exhibit 10.20

 Exhibit 10.20 
 CONSULTING AGREEMENT 
 This Consulting Agreement (this
“Agreement”), is entered into this 4th day of December, 2012 (the “Effective Date”), by and between Darren Miller, a citizen and resident of Texas with an address of 4527 Bermuda Drive, Sugar Land, TX 77479
(“Consultant”), and Quanta Services, Inc., a Delaware corporation with an address of 2800 Post Oak Blvd (the “Company” and together with its associated companies, affiliates, subsidiaries, shareholders, officers,
directors, managers, employees, agents, attorneys, representatives and assigns, the “Company Group”). 

WHEREAS, the Consultant has certain skills and expertise that may be useful to the Company; and 

WHEREAS, the Company desires to secure from Consultant certain consulting services and Consultant desires to provide the Company
with such services pursuant to the terms set forth herein. 
 NOW, THEREFORE, in consideration of the mutual covenants
and agreements set forth in this Agreement and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Consultant and the Company agree as follows: 

1. Scope of Consulting Agreement and Services. 

1.1. Engagement. Beginning on the Effective Date, the Company will engage Consultant as an independent contractor
to perform for the Company certain services as described in Section 1.2 below, and Consultant hereby accepts such engagement. With respect to such engagement, Consultant shall report to a representative of the Company designated by the Company.
Such representative shall (a) provide Consultant with the Company’s requests for Consultant’s services along with sufficient information for Consultant to properly perform those services hereunder and (b) examine and review the
services performed by Consultant, and promptly notify Consultant in the event the performance of any such services is deemed unsatisfactory by the Company. Notwithstanding anything contained herein to the contrary, except as limited by the
provisions of this Section 1 and Sections 6 and 7 hereof, this Agreement shall be considered to be non-exclusive relationship between the parties whereby Consultant shall be free to contract or subcontract directly or indirectly with other
companies and individuals during the Term (as defined in Section 7.1 below) of this Agreement. 
 1.2.
Nature and Performance of Services. For purposes of this Agreement, the term “services” shall include all obligations, duties, requirements and responsibilities of Consultant for the successful completion by Consultant of the
work assigned to Consultant by the Company hereunder, including the furnishing of all supervision, labor, materials and other supplies, in accordance with the terms and conditions set forth herein. During the Term of this Agreement at such times as
the Company may reasonably request, Consultant agrees to be available to the Company, as needed, to perform services for, consult with, advise and otherwise assist the Company as may be requested by the Company. Consultant shall only perform
services that are authorized in writing by the Company prior to the performance of such services, including mutually agreed upon time schedules for completion of such services, if appropriate. Consultant has the right, in Consultant’s sole
discretion, to accept or refuse any assignment offered by the Company. Consultant will perform the requested services in a professional, workmanlike and expeditious manner under the direction of the Company’s directors and/or representatives,
and comply, to the best of Consultant’s ability, with the rules, regulations and instructions of the Company. In consideration for such services, the Company will compensate Consultant as set forth in Section 2 below. All services of
Consultant provided to Company under this Agreement shall be performed solely by Consultant, unless otherwise agreed to in writing by the Company. 

 1.3. Ability to Provide Services. Consultant represents and warrants
that the role as a Consultant for the Company as contemplated herein does not violate any applicable law, and that Consultant will obtain and maintain any and all permissions, approvals, qualifications, licenses, registrations and authorizations
required by any applicable law to serve in this capacity. Consultant agrees to make all notices to and filings with any governmental authority required for the due execution and performance of this Agreement. Consultant represents that this
engagement by the Company and the services performed under this Agreement will not violate any obligations that Consultant may have to any other party. Consultant acknowledges and agrees that the Company shall be entitled in its discretion to
disclose fully to any appropriate governmental authorities the role of Consultant and its relationship to the Company. 
 2.
Compensation. 
 2.1. Fees. During the Term of this Agreement, the Company will pay the
Consultant for services performed pursuant to Section 1 above as indicated on Exhibit A (the “Fee”). The Fee represents the total compensation to be paid to Consultant for such services, and Consultant will not be
entitled to, and the Company shall have no obligation to provide to Consultant, any other form of remuneration or benefit of any kind whatsoever, except as may be explicitly provided herein. 

2.2. Expenses. Consultant will be reimbursed by the Company for such reasonable direct travel expenses and other
reasonable out-of-pocket costs actually incurred in the performance of Consultant’s services hereunder; provided that such expenses and costs are approved by the Company in writing prior to their incurrence pursuant to internal operating
procedures of the Company. Consultant agrees to supply the Company with receipts and other supporting documentation for any expenses or costs to be reimbursed. 

2.3. Payment of Fees and Expenses. Consultant shall deliver to the Company no later than the
10th day of each month an invoice for Fees, expenses and
costs of the preceding month that are payable under Section 2 and outlining the services performed, hours worked and expenses and costs incurred. Payment for each invoice shall be made by the Company within 30 days of its receipt. Such payment
of Fees to Consultant will represent the full and final payment for such services rendered by Consultant to the Company. 
 2.4. Taxes. Consultant shall be responsible for any and all taxes, levies or other liabilities (including services taxes) that may result from the payment of the Fees, expenses and costs, and all
payments to Consultant will be made via wire transfer to Consultant’s bank account (pursuant to wire instructions provided by Consultant), except as otherwise mutually agreed by the parties hereto. Consultant further acknowledges that
Consultant is responsible for filing, withholding, reporting and paying all applicable taxes that may be applicable to the payment of the Fee or reimbursement of the expenses and costs, including, without limitation, any social security and
unemployment taxes. 
 3. Independent Contractor. Consultant acknowledges that Consultant is an independent
contractor to the Company. During the Term (as defined below) of this Agreement, Consultant shall always act as an independent contractor and nothing herein shall be construed to create any agency, partnership, joint venture or other cooperative
relationship between the Company and Consultant or a relationship of employer and employee between the Company and Consultant. As an independent contractor, Consultant acknowledges that Consultant shall not be entitled to any of the benefits the

  
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Company affords its employees and that Consultant is not eligible to participate in any of the Company’s employee benefit plans, including, without limitation, pension plans, vacation pay,
sick leave, health or disability benefits, unemployment insurance benefits, retirement benefits, restricted stock grants or other employee benefits of any kind. In addition, Consultant shall not be treated as an employee of the Company for purposes
of the Federal Insurance Contributions Act, the Social Security Act, the Federal Unemployment Act, income tax withholding and any applicable state or local laws, including without limitation, those pertaining to workers’ compensation,
unemployment compensation and income tax withholding, and Consultant shall be solely responsible for the withholding and payment of all insurance premiums, including, but not limited to, health insurance and workers’ compensation insurance.

 4. Consultant’s Authority. The authority and powers of Consultant hereunder are strictly limited to those
necessary for the performance of the services hereunder. Consultant shall not have the right, power or authority to bind, represent or commit the Company in any way, manner or thing whatsoever, or represent that it has any right to do so. In
particular and notwithstanding anything to the contrary herein, without the approval of the Company, Consultant shall not: (a) make any representations or undertakings on behalf of the Company Group, (b) represent as having authority to
bind the Company Group or to accept orders or conduct business on behalf of the Company Group, (c) enter into or create any binding liability or obligation on the Company Group or (d) represent that Consultant is or otherwise hold itself
out as a joint venturer, member, manager, partner, shareholder, director, officer, employee, legal representative or commercial agent of the Company Group. Consultant shall be liable for, and indemnify and hold harmless the Company Group from, any
and all claims and liabilities resulting from Consultant’s failure to strictly comply with the provisions of this Section 4. 
 5. Trade Names. Consultant understands and agrees that the names Quanta, Quanta Services and any other names associated with the Company Group are exclusively associated with and are the
property of the Company Group, and Consultant shall not, whether before or after the date of termination, have any right to use such name or any derivatives or variations thereof for any purposes whatsoever. 

6. Confidential Information; Non-Disclosure. 

6.1. Confidential Information. Consultant acknowledges that, in the course of the services that will be performed
pursuant to this Agreement, Consultant will have access to trade secrets, intellectual property and proprietary or confidential information related to the Company Group’s businesses, such information shall include, but not be limited, to
information concerning the Company Group’s customers or partners (including their identities), pricing, processes, suppliers, methods, operations, services, technologies, inventions, models, engineering data, maps, test results, diagrams,
specifications, processes, drawings, contracts, marketing techniques and materials, marketing and development plans, short-term and long-term business plans, strategies, employee information, lists of prospects compiled by the Company Group,
information received by the Company Group from third parties that is subject to obligations of confidentiality, other information regarding the Company Group’s business or accounts that the Company Group informs Consultant (or that Consultant
should know by virtue of the circumstances under which he learned this information) is to be kept confidential, and any other information that the Company designates as secret or confidential (collectively the “Confidential
Information”). Confidential Information shall not include any information which (i) is or becomes available to Consultant from a source other than the Company Group, (ii) is or becomes available to the public other than as a
result of disclosure by Consultant or its agents, or (iii) is required to be disclosed under applicable laws or judicial process, but only to the extent it must be disclosed. 

  
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 6.2. Nature of Confidential Information. Consultant acknowledges and
recognizes this Confidential Information is not known to the Company Group’s competitors or generally known within the specialized construction contracting, electric power, telecommunication, renewable energy, or pipeline industries, the
Confidential Information was developed by the Company Group over a long period of time and/or at its substantial expense, that the Company Group undertakes reasonable efforts to protect this Confidential Information, and this Confidential
Information is of great competitive value to the Company. The Company makes no express or implied representation or warranty as to the accuracy or completeness of any Confidential Information and shall have no liability as a result of the use of any
Confidential Information. 
 6.3. Ownership and Control of Confidential Information. All Confidential
Information shall be and remain the exclusive property of the Company Group, and no right or license is granted (expressly, by implication, estoppel or otherwise) to Consultant by virtue of this Agreement or any disclosure of Confidential
Information hereunder. Nothing in this Agreement obligates the Company Group to disclose any Confidential Information to Consultant. 
 6.4. Use and Disclosure Restrictions. During and after the Term of this Agreement, Consultant will not (a) use any of the Confidential Information other than as authorized by the Company
within the scope of the services performed for the Company hereunder or (b) disclose or transfer any Confidential Information to any person or entity other than to the Company or to persons or entities to whom disclosure has been authorized by
the Company. Consultant understands that it is not allowed to sell, license or otherwise exploit any products (including software in any form) that embody or otherwise exploit in whole or in part any Confidential Information or materials. Consultant
will take all reasonable precautions to prevent the inadvertent or accidental exposure of the Confidential Information. Consultant understands and agrees that all obligations of confidentiality set forth in this Section 6.4 that apply to
Consultant, and all protections that apply to the Company herein, also hereby apply with regard to any and all members of the Company Group and all clients, suppliers, contractors and subcontractors of the Company Group. 

6.5. Publicity. No publicity releases (including news releases and advertising) relating to this Agreement and the
services performed hereunder shall be issued by Consultant without the prior written approval of the Company. Any inquiry that Consultant may receive from news media concerning this Agreement will be referred to the Company’s representative for
response. Any technical paper, article, publication or announcement of advances generated in connection with the services performed under this Agreement, during the Term of this Agreement or in the future, shall require the Company’s prior
written approval. 
 6.6. Return and Destruction of All Confidential Information. Upon the request of the
Company at any time and, in any event, without request, upon the end of the Term of this Agreement, Consultant will (a) return to the Company all tangible originals and copies of the Confidential Information, including any and all notes,
analyses, reports, summaries, compilations, studies or other documents, writings or materials prepared or developed by, for or on behalf of Consultant that contain, reflect or otherwise incorporate, use or rely on any Confidential Information and
(b) destroy or delete, as applicable, all such information and materials stored in electronic, magnetic, optical or any other intangible form and certify to the Company such destruction and deletion. Consultant agrees not to retain any copies
of any Confidential Information materials after the end of the Term of this Agreement for any reason. 
 6.7.
Compliance with U.S. Export Control Laws. Consultant agrees not to, directly or indirectly, transfer, export or re-export any technical data, or any product, equipment or material embodying or made by use of any technical data, that is part
of the Confidential Information of the Company in violation of any U.S. export control laws or regulations. 

  
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 6.8. Remedies. Consultant acknowledges and agrees that monetary
damages or other remedies at law would be inadequate to protect the Company Group against any actual or threatened breach of this Section 6 by Consultant, and that any such breach would cause irreparable harm, and, as such, agrees that the
Company Group shall be entitled to injunctive or other preliminary or equitable relief without proof of actual damages or posting of any bond with respect to any such actual or threatened breach. Compensatory damages or other monetary damages
remedies may only be awarded based on proof of actual damages. Such remedies shall not be deemed exclusive remedies for any such breach, but shall be in addition to and without prejudice to any other rights or remedies otherwise available to the
Company Group. 
 7. Term and Termination. 

7.1. Term and Rights to Terminate. The term of this Agreement (the “Term”) and Consultant’s
engagement shall commence on the Effective Date and continue on a month-to-month basis for six months, subject to its earlier termination by either party hereto upon written notice of termination to the other party with or without cause. The Company
and Consultant may extend the Term upon written agreement signed by both parties on a month-to-month basis for up to an additional six months beyond the initial six-month term. 

7.2. Effects of Termination. Except as may otherwise be expressly provided herein, upon the termination of this
Agreement for any reason pursuant to Section 11.1 above, (i) Consultant shall immediately discontinue the performance of services on the date and to the extent specified in the notice, (ii) Consultant will promptly return all property
of the Company or its affiliates which may be held in Consultant’s custody or trust, including but not limited to, equipment/and or documents of any nature whatsoever, and that Consultant will not duplicate or cause to have duplicated any
documents relating to the services performed by Consultant under this Agreement, except as may be specifically authorized in writing by the Company, (iii) Consultant shall promptly return and destroy all Confidential Information as provided in
Section 6.6, (iv) Consultant shall be paid the actual costs incurred during the performance of services hereunder up to the date of termination that have not been previously reimbursed by the Company, but only to the extent such costs are
necessary, reasonable and verifiable and have been incurred by Consultant prior to or in connection with discontinuing the work hereunder, specifically excluding unabsorbed overhead or anticipatory profit and (iv) neither party hereto shall
have any further obligations to the other under this Agreement beyond any other rights or obligations that have accrued hereunder prior to the date of termination. 

7.3. Survival. Any provision of this Agreement which is expressly or by implication intended to survive the
termination of this Agreement, including Sections 5 through 8, shall survive and remain in effect following the termination of this Agreement 
 8. Insurance. Prior to the performance by Consultant of any services hereunder, Consultant is required to obtain professional liability insurance against any and all claims sounding in
professional liability for the services performed hereunder, if such insurance is available. The Company shall not be liable for, and will not indemnify Consultant for, any such professional liability claims. Consultant shall also provide the
Company an insurance certificate evidencing Consultant has obtained insurance coverage as set forth in detail on Exhibit B. 

  
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 9. Indemnification. Consultant shall indemnify, defend and hold harmless the
Company from and against any and all claims and actions, and all expenses incidental to such claims or actions, based upon or arising out of damage to property or injuries to persons (including death) or other tortious acts caused or contributed to
by Consultant or anyone acting under Consultant’s direction or control or on Consultant’s behalf in the course of the performance of services under this Agreement, provided the Consultant’s aforesaid indemnity and hold harmless
agreement shall not be applicable to any liability to the extent arising from the negligence or willful misconduct of the Company. The Company shall indemnify, defend and hold harmless Consultant against any and all claims to the extent attributable
to the negligence or willful conduct of the Company. 
 10. Choice of Law. The interpretation, validity, and
effect of this Agreement shall be governed in all respects by the laws of Texas, without giving effect to its rules on choice of law. However, there shall be no presumption that the terms of this Agreement should be construed more favorably to one
party over another for any reason. Any trade secrets or intellectual property of the Company shall also be entitled to all of the protections and benefits under any other applicable law. 

11. Disputes. The Company and Consultant agree that any dispute arising as to the parties’ rights and obligations
hereunder, other than with respect to the Company’s right to seek injunctive relief for breaches of Sections 6, 9 and 10, shall, at the election and upon written demand of either party, be submitted to arbitration before a single mutually
agreeable arbitrator in Texas. 
 12. Notice. All notices, requests, demands, declarations and other
communications required hereunder or given pursuant hereto shall be in writing and shall become effective (a) if given by facsimile, when transmitted and receipt has been confirmed, (b) if given by courier or overnight delivery, when
delivered by such courier or overnight delivery carrier or (c) if personally delivered, when so delivered in person, addressed as follows: 
  

			
	(i) If to Consultant:	  	(ii) If to the Company:
		
	 Darren Miller
	  	 Jim O’Neil

	 4527 Bermuda Drive
	  	 Quanta Services, Inc.

	 Sugar Land, TX 77479
	  	 2800 Post Oak Blvd, Suite 2600

		  	 Houston, TX 770056

 or at such other address as either party may from time to time designate for itself by written notice to the other party.

 13. Assignment. The Company has chosen Consultant on the basis of Consultant’s experience and
qualifications, including Consultant’s reputation for ethical business conduct and compliance with applicable laws. As such, Consultant agrees not to assign any of its rights or obligations under this Agreement, or delegate the performance of
any of the duties hereunder, to any person or entity. 
 14. Entire Agreement; No Third Party Rights. This
Agreement sets forth the entire agreement between Consultant and the Company and fully supersedes and replaces any and all prior and contemporaneous agreements or understandings, written or oral, between the Company and Consultant pertaining to the
subject matter of this Agreement. A person who is not a party to this Agreement has no rights to enforce or to enjoy any of the benefits of any term of this Agreement 
 15. Heading and Captions. The heading and captions used in this Agreement are for convenience of reference purposes only and are not intended to, and will in no way, define, describe,
interpret, limit, expand or otherwise affect the extent of this Agreement or the meaning or construction of any provision of this Agreement. 

  
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 16. Partial Invalidity. Should any provision of this Agreement be declared or
be determined by any court of competent jurisdiction to be illegal, invalid or unenforceable, all remaining provisions of this Agreement shall otherwise remain in full force and effect and be construed as if such illegal, invalid or unenforceable
provision had not been included herein. 
 17. Waiver; Amendment. No term, provision or condition of this
Agreement can be waived, amended, supplemented or otherwise modified except in writing and signed by the Company and Consultant, and then such waiver, amendment, supplement or other modification shall only be effective in the specific instance and
for the specific purpose for which given. 
 18. No Waiver. No failure or delay by either party hereto in
exercising any right, power or privilege hereunder shall operate as a waiver thereof, nor shall any single or partial exercise or waiver thereof preclude any other or further exercise thereof or the exercise of any right, power or privilege
whatsoever hereunder. The waiver by either party hereto of a breach of any of the provisions of this Agreement shall not operate or be construed as a waiver of any subsequent or simultaneous breach of the same or different provisions. 

19. Acknowledgment. The parties affirm that they have read this Agreement and have had adequate time to consider the terms
of the Agreement. Consultant and the Company represent and acknowledge that in executing this Agreement they do not rely upon and have not relied upon any representation or statement made by any of the parties or by any of the parties’ agents,
attorneys, employees or representatives with regard to the subject matter, basis or effect of this Agreement or otherwise, other than those specifically stated in this Agreement. 

20. Counterparts; Signatures. This Agreement may be executed in two or more counterparts, each of which shall constitute an
original and all of which together shall constitute one and the same instrument. It will not be necessary in making proof of this Agreement or the terms of this Agreement to produce or account for more than one such counterparts. Each party agrees
that it will be bound by its own facsimile or scanned signature and that it accepts the facsimile or scanned signature of the other party to this Agreement. 
 IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first written above. 
  

									
	QUANTA SERVICES, INC.	 		 	CONSULTANT:
				
	By:	 	/s/ James F. O’Neil	 		 	/s/ Darren B. Miller
		 	James F. O’Neil	 		 	Darren Miller
		 	Chief Executive Officer	 		 		 	

  
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 EXHIBIT A 
 COMPENSATION SCHEDULE 
 Charging Rate for Fee: $27,097 per month 

Completion Fee: If the Company determines that Consultant has satisfactorily performed duties upon the completion of Consultant’s services
pursuant to this Agreement, Consultant will receive a lump-sum payment of up to $250,000. 
 Travel Time and Expenses: Lodging, meals and
other incidental travel expenses shall be reimbursed to Consultant in the same manner and under the same conditions as those governing travel expense payments for Company employees. Travel expenses by commercial carrier will be reimbursed at the
economy class for such travel. Use of Consultant’s own automobile will be reimbursed at the then current IRS mileage rate. 
  

							
	Consultant: /s/ Darren B. Miller	 	Date: 12-17-12	 	
				
	Company Representative: /s/ James F. O’Neil	 		 	Date: 11/30/12	 	

  
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 EXHIBIT B 
 SUMMARY OF CONSULTANT INSURANCE REQUIREMENTS 
 Consultant shall, for the
Term of the Agreement, and for a period of one year following termination of this Agreement, carry and maintain in full force and effect insurance with such companies as are acceptable to the Company, insuring Consultant while its obligations
hereunder for the following types of coverage: 
 [None] 

 
  
  

 

  
 9Exhibit 10.32

 Exhibit 10.32 
 SIXTH AMENDMENT TO 
 UNDERWRITING, CONTINUING INDEMNITY, AND SECURITY
AGREEMENT 
 This SIXTH AMENDMENT TO UNDERWRITING, CONTINUING INDEMNITY, AND SECURITY AGREEMENT (“this
Amendment”), dated as of December 3, 2012, is made by and among Federal Insurance Company, an Indiana corporation (“Federal”); American Home Assurance Company, National Union Fire Insurance Company of Pittsburgh, Pa., and The
Insurance Company of the State of Pennsylvania (collectively “AIG”); Liberty Mutual Insurance Company, a Massachusetts company, Liberty Mutual Fire Insurance Company, and Safeco Insurance Company of America (collectively, “Liberty
Mutual”); and Quanta Services, Inc., a Delaware corporation (“Quanta”) and an Indemnitor, the other undersigned Indemnitors, and the Trench Companies. All capitalized terms will have the meaning set out in this paragraph, the
recitals, and Section 1. 
 WHEREAS, Federal, AIG, Liberty Mutual, Indemnitors, and certain of the Trench Companies are
party to that certain Underwriting, Continuing Indemnity, and Security Agreement, dated as of March 14, 2005, as amended by that certain Joinder Agreement and Amendment to Underwriting, Continuing Indemnity and Security Agreement dated as of
November 28, 2006, wherein AIG was added as a Surety, as further amended by that certain Second Amendment to Underwriting, Continuing Indemnity and Security Agreement dated as of January 9, 2008, as further amended by that certain Joinder
and Third Amendment to Underwriting, Continuing Indemnity and Security Agreement dated as of December 19, 2008, as further amended by that certain Joinder Agreement and Fourth Amendment to Underwriting, Continuing Indemnity and Security
Agreement dated as of March 31, 2009, wherein Liberty Mutual was added as a Surety, as further amended by that certain Joinder and Fifth Amendment to Underwriting, Continuing Indemnity, and Security Agreement dated as of May 17, 2012
(collectively, “the Underwriting Agreement”); 
 WHEREAS, the Trench Companies are contemporaneously herewith being
sold to a third party; 
 WHEREAS, in connection with such sale of the Trench Companies, Indemnitors have requested, and Surety
has agreed, subject to certain conditions set forth herein, to remove and release the Trench Companies as Principals and Indemnitors under the Underwriting Agreement, as amended by this Amendment, and the other Surety Credit Documents; and

 WHEREAS, the parties to the Underwriting Agreement desire to further amend the Underwriting Agreement as hereinafter set
forth, and this Amendment, the terms hereof and consummation of the transactions contemplated hereby will be beneficial to Indemnitors and the Trench Companies. 
 NOW, THEREFORE, in consideration of the mutual promises and covenants set forth herein, the parties hereto hereby agree as follows: 
 1. Definitions. Capitalized terms used in this Amendment and not otherwise defined are used herein as defined in the Underwriting Agreement. 

 The definition of “Bonds” in Section 1 of the Underwriting Agreement is
amended to add the following at the end of such definition: “‘Bonds’ will also mean any surety agreements, undertakings, or instruments of guaranty signed by Surety on behalf of any of the Trench Companies prior to the Sixth Amendment
Effective Date, exclusive of the Trench Open Bonds. 
 The definitions of “Indemnitors” and “Principal” in
Section 1 of the Underwriting Agreement are each amended to add the following to each such definition, at the end of each such definition: 
 Notwithstanding the foregoing or anything in this Agreement or any other Surety Credit Document to the contrary, in no event will any of the Trench Companies be an Indemnitor or Principal for purposes of
this Agreement or any other Surety Credit Document. The exclusion of the Trench Companies as Indemnitors and Principals for the purposes of this Agreement and each other Surety Credit Document will not limit the indemnity obligations of any of the
Trench Companies as may be agreed to by any of such Trench Companies in any other agreement entered into by any of such Trench Companies (other than any Surety Credit Document). 

The definition of “Surety Loss” in Section 1 of the Underwriting Agreement is amended to restate subparagraph (a) of
said definition (exclusive of items (1) – (5) thereunder) to read as follows: 
 all damages, costs, reasonable
attorney fees, and liabilities (including all reasonable expenses incurred in connection therewith) which Surety actually incurs by reason of (i) executing or procuring the execution of any surety agreements, undertakings, or instrument of
guarantee, or renewal or continuation thereof, signed by Surety on behalf of (y) any Principal or Island Mechanical, Hawaii, and (z) if requested by any Indemnitor, any Affiliates and Subsidiaries of Quanta Services, Inc., (ii) Bonds
which may be already or hereafter be executed on behalf of any Principal and/or any Foreign Subsidiary, or renewal or continuation thereof, and/or (iii) Bonds that were already executed by Surety prior to the Sixth Amendment Effective Date on
behalf of any of the Trench Companies, or renewal or continuation thereof, exclusive of the Trench Open Bonds; or which Surety actually incurs by reason of making any investigation on account thereof, prosecuting or defending any action in
connection therewith, obtaining a release, recovering, or attempting to recover any salvage in connection therewith or enforcing by litigation or otherwise any of the provisions of this Agreement, including, but not limited to: 

Section 1 of the Underwriting Agreement is amended to add the following defined terms in alphabetical order: 

“Sixth Amendment Effective Date” means December 3, 2012. 

  
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 “Trench Companies” means and includes the following: Blair Park Services, LLC, a
Delaware limited liability company; CCLC, Inc., a Delaware corporation; CMI Services, Inc., a Florida corporation; E A Technical Services, Inc., a Georgia corporation; Engineering Associates, Inc., a Georgia corporation; Global Enercom Management,
Inc., a Delaware corporation; Golden State Utility Co., a Delaware corporation; InfraSource Telecommunication Services, LLC, a Delaware limited liability company; North Sky Communications, Inc., a Delaware corporation; Parkside Site &
Utility Company Corporation, a Delaware corporation; Parkside Utility Construction Corp., a Delaware corporation; Pauley Construction Inc., an Arizona corporation; Professional Teleconcepts, Inc., an Illinois corporation; Professional Teleconcepts,
Inc., a New York corporation; Quanta Wireless Solutions, Inc., a Delaware corporation; Spalj Construction Company, a Delaware corporation; Tjader, L.L.C., a Delaware limited liability company; Trawick Construction Company, Inc., a Florida
corporation; VCI Construction, Inc., a Delaware corporation; and VCI Utility Services, Inc., a Delaware corporation. 

“Trench Open Bonds” means and includes all of the surety agreements, undertakings, or instruments of guaranty listed on the
attached Exhibit D, which were signed by Surety on behalf of any or all or any combination of the Trench Companies. 
 2.
Exhibit A. Exhibit A to the Underwriting Agreement is hereby deleted in its entirety and replaced with Exhibit A to this Amendment. 
 3. Exhibit D. A new Exhibit D to the Underwriting Agreement is hereby added in the form attached as Exhibit D to this Amendment. 

4. Representations and Warranties. Each party to this Amendment, individually and for itself only, hereby represents and warrants
to each of the other parties as follows: 
 4.1 The execution, delivery and performance by such party of this Amendment and the
performance by such party of its respective obligations under this Amendment and the Underwriting Agreement, as amended hereby, and the consummation of the transactions contemplated hereby and thereby, (a) have been duly authorized by all
necessary corporate or other such action, if any, and (b) do not and will not, with or without the giving of notice or lapse of time or both, (i) contravene any term or condition of its organizational documents or (ii) violate any
applicable laws. Such party has all requisite corporate, partnership or limited liability company power and authority to enter into this Amendment and to perform its obligations hereunder and under the Underwriting Agreement, as amended hereby.

 4.2 This Amendment has been duly and validly executed and delivered by such party and this Amendment and the Underwriting
Agreement, as amended hereby, constitute the legal, valid and binding obligations of such party, enforceable against such party in accordance with their terms, subject to applicable bankruptcy, insolvency, fraudulent conveyance, reorganization,
moratorium and similar laws affecting creditors’ rights and remedies generally, and to general principles of equity (regardless of whether enforcement is sought in a proceeding at law or in equity). 

5. Unearned Premium on Trench Open Bonds. Federal and Liberty hereby agree that they will return, on or promptly after the Sixth
Amendment Effective Date, the unearned portion of the premium (determined with respect to performance prior to the Sixth Amendment Effective Date) on the Trench Open Bonds to Quanta Services, Inc. 

  
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	 	6.	Release. 

 6.1 Surety
hereby (i) releases and terminates all liabilities, duties, covenants, and obligations of the Trench Companies, together with their officers, directors, employees, and their respective successors and assigns, under the Surety Credit Documents
(when referred to in this Section, “Obligations”), releases all assets and Collateral owned by each Trench Company, and releases all claims, demands, actions, causes of action, debts, costs, and liabilities whatsoever, whether at law or in
equity, under the Surety Credit Documents (when referred to in this Section, “Claims”), including, without limitation, any Obligations or Claims that relate to any of the Trench Companies in the capacity as Indemnitor or Principal;
(ii) releases all Liens of Surety on the Collateral that constitutes assets owned by the Trench Companies; and (iii) terminates and releases any trusts created in favor of Surety in any funds owned or held by any of the Trench Companies,
provided, that, said funds are not proceeds of any Collateral provided to Surety by any of the other Indemnitors in which Surety retains its Lien and security interest, in each case without the need for any further action. Surety hereby agrees and
acknowledges that any and all such Obligations, Claims, and Liens are hereby terminated and released. Surety and the other parties hereto also agree that the power of attorney granted by any of the Trench Companies in favor of Quanta Services, Inc.
pursuant to Section 53 of the Underwriting Agreement is hereby terminated. Notwithstanding the forgoing or anything in this Agreement or any other Surety Credit Document to the contrary, the foregoing will not release or limit the Trench
Companies from any indemnity or other Obligations of any of the Trench Companies as may be expressly agreed to by any of such Trench Companies in any other agreement entered into by any of such Trench Companies after the Sixth Amendment Effective
Date. 
 6.2 Surety hereby terminates and releases that all liabilities, duties, covenants, and Obligations of Principals and
Indemnitors (but, for the avoidance of doubt, excluding the Trench Companies), together with their respective officers, directors, employees, and their respective successors and assigns, under or in connection with the Trench Open Bonds, and
releases all claims, demands, actions, causes of action, debts, costs, and liabilities whatsoever, whether at law or in equity, under or in connection with the Trench Open Bonds as they relate to Principals and Indemnitors (but, for the avoidance of
doubt, excluding the Trench Companies), in each case without the need for any further action. 
 6.3 Surety will deliver or
cause to be delivered to Quanta, or a party designated by Quanta, on the Sixth Amendment Effective Date, UCC Termination Statements and such other lien releases or termination documents, and will take or cause to be taken such other actions, in each
case, as Quanta may request in order to evidence or otherwise give public notice of the termination of the Obligations and the Claims and collateral terminations and releases of the Collateral of the Trench Companies, and Quanta and/or its
designee(s) are hereby authorized to file such UCC Termination Statements and other lien releases with the appropriate filing offices. 

  
 4 

 7. Notices. Section 38 of the Underwriting Agreement is hereby amended to
provide that notices to Federal and Liberty Mutual will be directed as follows: 
  

			
	Federal:	 	Federal Insurance Company
		 	15 Mountain View Road
		 	P.O. Box 1615
		 	Warren, New Jersey 07061-1615
		 	Attn.: Richard Towle
		 	          Warren Eichhorn
		 	          Richard Barnett
		
	Liberty Mutual:	 	Liberty Mutual Insurance Company
		 	450 Plymouth Road, Suite 400
		 	Plymouth Meeting, PA 19462
		 	Attn: Virginia C. Boyle
		
	With a copy to:	 	Manier & Herod
		 	2200 One Nashville Place
		 	150 4th Avenue North
		 	Nashville, Tennessee 37219
		 	Attn: Sam H. Poteet, Jr.
		 	          Mary Paty Lynn LeVan

 8. Further Instruments and Actions. The parties to this Amendment hereby agree to execute
such further instruments and to take such further action as may reasonably be necessary to carry out the intent and purpose of this Amendment and the Underwriting Agreement, as amended hereby. 

9. Amendment. This Amendment may not be amended or modified except by a writing signed by or on behalf of each of the parties
hereto. 
 10. Headings. The section headings in this Amendment are included for convenience of reference only and will
not constitute a part of this Amendment for any other purpose. 
 11. Governing Law. This Amendment will be governed by
and construed and enforced in accordance with the laws of the State of New York (without giving effect to its conflict of laws principles). 
 12. Ratification. The Underwriting Agreement, the other Surety Credit Documents, and any other documents executed and delivered pursuant thereto or in connection therewith are each ratified and
confirmed in all respects and will remain in full force and effect in accordance with their respective terms, as modified by this Amendment. 
 13. Entire Agreement. This Amendment, together with the Underwriting Agreement and the other Surety Credit Documents, represent the entire agreement between the parties hereto concerning the
subject matter hereof, and all oral discussions and prior agreements are merged herein. 
 14. Severability. Should any
provision of this Amendment be invalid or unenforceable for any reason, the remaining provisions hereof will remain in full effect. 

  
 5 

 15. Binding Agreement. This Amendment, and the terms, covenants and conditions
hereof, will be binding upon the parties hereto and their respective successors and assigns, and will inure to the benefit of the parties, and their respective successors and permitted assigns. 

16. Counterparts. This Amendment may be executed in multiple counterparts, each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument. A facsimile copy of an executed original counterpart of this Amendment shall have the same force and effect as an executed original counterpart. 

17. Effect. Upon the effectiveness of this Amendment, each reference in the Underwriting Agreement to “this Agreement,”
“hereunder” or words of like import shall mean and be a reference to the Underwriting Agreement, as affected and amended by this Amendment. 
 IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the date first above written. 
  

			
	 SURETY:

	
	FEDERAL INSURANCE COMPANY
		
	By:	 	/s/ Matthew E. Lubin
	Name:	 	Matthew E. Lubin
	Title:	 	Vice President
	
	LIBERTY MUTUAL INSURANCE COMPANY
		
	By:	 	/s/ Ken Berk
	Name:	 	Ken Berk
	Title:	 	Assistant Secretary
	
	LIBERTY MUTUAL FIRE INSURANCE COMPANY
		
	By:	 	/s/ Ken Berk
	Name:	 	Ken Berk
	Title:	 	Assistant Secretary
	
	SAFECO INSURANCE COMPANY OF AMERICA
		
	By:	 	/s/ Ken Berk
	Name:	 	Ken Berk
	Title:	 	Assistant Secretary

  
 6 

 
			
	 AMERICAN HOME ASSURANCE COMPANY

	 NATIONAL UNION FIRE INSURANCE COMPANY OF PITTSBURGH, PA.

	 THE INSURANCE COMPANY OF THE STATE OF PENNSYLVANIA

		
	By:	 	/s/ Kevin M. Maroney
	Name:	 	Kevin M. Maroney
	Title:	 	Vice President
	
	PRINCIPAL/INDEMNITORS:
	
	QUANTA SERVICES, INC.
		
	By:	 	/s/ Darren B. Miller
	Name:	 	Darren B. Miller
	Title:	 	Vice President-Information Technology and Administration
	
	 ALLTECK LINE CONTRACTORS (USA), INC.

	 CAN-FER UTILITY SERVICES, LLC

	 CROCE ELECTRIC COMPANY, INC.

	 CONAM CONSTRUCTION CO.

	 CRUX SUBSURFACE, INC.

	 DACON CORPORATION

	 DASHIELL CORPORATION

	 DILLARD SMITH CONSTRUCTION COMPANY

	 ENERGY CONSTRUCTION SERVICES, INC.

	 FIVE POINTS CONSTRUCTION CO.

	 H.L. CHAPMAN PIPELINE CONSTRUCTION, INC.

	 INFRASOURCE, LLC

	 INFRASOURCE CONSTRUCTION, LLC

	 INFRASOURCE CONSTRUCTION SERVICES, LLC

	 INFRASOURCE INSTALLATION, LLC

	 INFRASOURCE PIPELINE FACILITIES, INC.

	 INFRASOURCE TRANSMISSION SERVICES COMPANY

	 INFRASOURCE UNDERGROUND CONSTRUCTION, INC.

	 INFRASOURCE UNDERGROUND SERVICES CANADA, INC.

	 INTERMOUNTAIN ELECTRIC, INC.

  
 7 

 
			
	IRBY CONSTRUCTION COMPANY
	ISLAND MECHANICAL CORPORATION
	MANUEL BROS., INC.
	MEARS GROUP, INC.
	 MEJIA PERSONNEL SERVICES, INC.
 M.J. ELECTRIC CALIFORNIA, INC.

	M.J. ELECTRIC, LLC
	PAR ELECTRICAL CONTRACTORS, INC.
	POTELCO, INC.
	PRICE GREGORY CONSTRUCTION, INC.
	PRICE GREGORY INTERNATIONAL, INC.
	ROAD BORE CORPORATION
	QUANTA POWER GENERATION, INC.
	QUANTA DELAWARE, INC.
	QUANTA GOVERNMENT SERVICES, INC.
	QUANTA GOVERNMENT SOLUTIONS, INC.
	QUANTA UTILITY INSTALLATION COMPANY, INC.
	QUANTA UTILITY SERVICES – GULF STATES, INC.
	SERVICE ELECTRIC COMPANY
	SOUTHWEST TRENCHING COMPANY, INC.
	SUMTER UTILITIES, INC.
	SUNESYS, LLC
	THE RYAN COMPANY, INC.
	TOM ALLEN CONSTRUCTION COMPANY
	UNDERGROUND CONSTRUCTION CO., INC.
	UTILITY LINE MANAGEMENT SERVICES, INC.
	WINCO, INC.
		
	By:	 	/s/ Nicholas M. Grindstaff
	Name:	 	Nicholas M. Grindstaff
	Title:	 	Treasurer
	
	MEARS/CPG LLC
		
	By:	 	Mears Group, Inc., The Sole Member of the foregoing limited liability company
		
	By:	 	/s/ Nicholas M. Grindstaff
	Name:	 	Nicholas M. Grindstaff
	Title:	 	Treasurer

  
 8 

 
			
	DIGCO UTILITY CONSTRUCTION, L.P.
	LINDSEY ELECTRIC, L.P.
	NORTH HOUSTON POLE LINE, L.P.
		
	By:	 	Mejia Personnel Services, Inc., Its General Partner
		
	By:	 	/s/ Nicholas M. Grindstaff
	Name:	 	Nicholas M. Grindstaff
	Title:	 	Treasurer
	
	QUANTA SERVICES MANAGEMENT PARTNERSHIP, L.P.
		
	By:	 	QSI, Inc., Its General Partner
		
	By:	 	/s/ Nicholas M. Grindstaff
	Name:	 	Nicholas M. Grindstaff
	Title:	 	Treasurer
	
	TRENCH COMPANIES:
	
	BLAIR PARK SERVICES, LLC
	CCLC, INC.
	CMI SERVICES, INC.
	EA TECHNICAL SERVICES, INC.
	ENGINEERING ASSOCIATES, INC.
	GLOBAL ENERCOM MANAGEMENT, INC.
	GOLDEN STATE UTILITY CO.
	INFRASOURCE TELECOMMUNICATION     SERVICES, LLC
	NORTH SKY COMMUNICATIONS, INC.
	PARKSIDE SITE & UTILITY COMPANY     CORPORATION
	PARKSIDE UTILITY CONSTRUCTION CORP.
	PAULEY CONSTRUCTION INC.
	PROFESSIONAL TELECONCEPTS, INC. (IL)
	PROFESSIONAL TELECONCEPTS, INC. (NY)
	QUANTA WIRELESS SOLUTIONS, INC.
	SPALJ CONSTRUCTION COMPANY
	TRAWICK CONSTRUCTION COMPANY, INC.
	VCI CONSTRUCTION, INC.
	VCI UTILITY SERVICES, INC.
		
	By:	 	/s/ Nicholas M. Grindstaff
	Name:	 	Nicholas M. Grindstaff
	Title:	 	Treasurer

  
 9 

 
					
	 TJADER, L.L.C.

		
	 By:
	 	 Spalj Construction Company,

		 	 Its Sole Member

			
		 	 By:
	 	/s/ Nicholas M. Grindstaff
		 	 Name:
	 	Nicholas M. Grindstaff
		 	 Title:
	 	Treasurer

  
 10 

 FEDERAL/QUANTA SERVICES, INC. 

LIST OF PRINCIPAL/INDEMNITORS 
  

									
	 PRINCIPAL
	  	JURISDICTION
OF FORMATION	  	 LOCATION OF
CHIEF
 EXECUTIVE OFFICE

AND PRINCIPAL
 PLACE OF BUSINESS
	  	TAX ID NO.	  	 PRIOR NAMES OR
TRADE
NAMES

	 Quanta Services, Inc.
	  	Delaware	  	 2800 Post Oak Blvd.,

Suite 2600
 Houston, TX 77056
	  	74-2851603	  	None
					
	 Allteck Line Contractors (USA), Inc.
	  	Washington	  	 9718 197 B Street

Langley, BC V1M3G3
 Canada
	  	98-0198185	  	None
					
	 CAN-FER Utility Services, LLC
	  	Delaware	  	 3340 Roy Orr Boulevard

Grand Prairie, TX 75050
	  	76-0589263	  	CAN-FER Construction Company
					
	 Conam Construction Co.
	  	Texas	  	 301 W. Northern
 Lights
Blvd., Ste. 300
 Anchorage, AK 99503
	  	75-1984829	  	None
					
	 Croce Electric Company, Inc.
	  	Delaware	  	 14100 East Thirty-Fifth

Place, Ste. 100
 Aurora, CO 80011
	  	76-0605518	  	Croce Electric Company
					
	 Crux Subsurface, Inc.
	  	Delaware	  	 16707 E. Euclid Ave.

Spokane Valley, WA 99216
	  	76-0644263	  	Quanta LXV Acquisition, Inc.
					
	 Dacon Corporation
	  	Delaware	  	 1300 Underwood Road

Deer Park, TX 77536
	  	20-3699950	  	None
					
	 Dashiell Corporation
	  	Delaware	  	 12301 Kurland Drive

Ste. 400
 Houston, TX 77034
	  	20-3699713	  	 Dashiell, LLC
  

Dacon Corporation

					
	 Digco Utility Construction, L.P.
	  	Delaware	  	 1608 Margaret Street

Houston, TX 77093
	  	76-0612176	  	 Digco Utility Construction Limited Partnership
  

Ranger Field Services, Inc.

					
	 Dillard Smith Construction Company
	  	Delaware	  	 4001 Industry Dr.

Chattanooga, TN 37416
	  	76-0589264	  	 P.D.G. Electric Company
  

Dillard Smith Construction Company (Delaware)

					
	 Energy Construction Services, Inc.
	  	Delaware	  	 14100 East Thirty-Fifth

Place Ste. 100,
 Aurora, CO 80011
	  	27-4914829	  	None
					
	 Five Points Construction Co.
	  	Texas	  	 5145 Industrial Way

Benicia, CA 94510
	  	94-2738636	  	None

  
 EXHIBIT A

									
	 PRINCIPAL
	  	
JURISDICTION
OF FORMATION
	  	 LOCATION OF
CHIEF
 EXECUTIVE OFFICE

AND PRINCIPAL
 PLACE OF BUSINESS
	  	TAX ID NO.	  	 PRIOR NAMES OR TRADE
NAMES

	 H. L. Chapman Pipeline Construction, Inc.
	  	Delaware	  	 9250 FM 2243
 Leander, TX
78641
	  	76-0598341	  	 DB Utilities
  

Sullivan Welding
  
 Chapman Pipeline Construction, Inc., H.L.

					
	 InfraSource, LLC
	  	Delaware	  	 411 Edwardsville Road
 Troy, IL
62294
	  	20-5703765	  	 InfraSource Construction California, Inc.
  

IUS Underground, LLC

					
	 InfraSource Construction, LLC
	  	Delaware	  	 4033 East Morgan
 Ypsilanti, MI
48197
	  	04-3633384	  	 IUC North Dakota, LLC
  

InfraSource Underground Construction, LLC
  

Trans Tech Electric

					
	 InfraSource Construction Services, LLC
	  	Georgia	  	 4033 East Morgan
 Ypsilanti, MI
48197
	  	58-1696154	  	InfraSource Underground Construction Services, LLC
					
	 InfraSource Installation, LLC
	  	Delaware	  	 4033 East Morgan
 Ypsilanti, MI
48197
	  	41-1625874	  	None
					
	 InfraSource Pipeline Facilities, Inc.
	  	North Carolina	  	 11712 Statesville Road

Huntersville, NC 28078
	  	56-0861169	  	Bradford Brothers, Incorporated
					
	 InfraSource Transmission Services Company
	  	Arizona	  	 2800 Post Oak Blvd., Ste. 2600

Houston, TX 77056
	  	86-0787875	  	InfraSource Maslonka CA, Inc.
					
	 InfraSource Underground Construction, Inc.
	  	Delaware	  	 4033 East Morgan
 Ypsilanti, MI
48197
	  	51-0324281	  	 IUC Michigan, Inc.
  

IUC Texas, Inc.

					
	 InfraSource Underground Services Canada, Inc.
	  	Delaware	  	 2800 Post Oak Blvd.,
 Ste.
2600,
 Houston, TX 77056
	  	20-3676436	  	None
					
	 Intermountain Electric, Inc.
	  	Colorado	  	 14100 East Thirty-Fifth
 Place
Ste. 100,
 Aurora, CO 80011
	  	84-0906573	  	 Colorado IM Electric
  

Grand Electric Company
  
 IME

  
 2 

									
	 PRINCIPAL
	 	
JURISDICTION
OF FORMATION
	  	 LOCATION OF
CHIEF
 EXECUTIVE OFFICE

AND PRINCIPAL
 PLACE OF BUSINESS
	 	TAX ID NO.	  	 PRIOR NAMES OR TRADE
NAMES

	 Irby Construction Company
	 	Mississippi	  	 817 S. State Street
 Jackson,
MS 39201
	 	64-0902002	  	 Irby Construction Company, Inc.
  

Okay Construction Company, LLC

					
	 Island Mechanical Corporation
	 	Hawaii	  	 91-230 Kuhela St.
 Kapolei, HI
96707
	 	99-0299930	  	None
					
	 Lindsey Electric, L.P.
	 	Texas	  	 1608 Margaret Street
 Houston,
TX 77093
	 	02-0557008	  	None
					
	 Manuel Bros., Inc.
	 	Delaware	  	 908 Taylorville Road,
 Suite
104
 Grass Valley, CA 95949
	 	76-0577087	  	 Renaissance Construction
  

Western Directional

					
	 Mears/CPG LLC
	 	Michigan	  	 4500 N. Mission Road
 Rosebush,
MI 48878
	 	N/A	  	None
					
	 Mears Group, Inc.
	 	Delaware	  	 4500 N. Mission Road
 Rosebush,
MI 48878
	 	76-0612167	  	Mears/HDD, LLC
					
	 Mejia Personnel Services, Inc.
	 	Texas	  	 2800 Post Oak Blvd.,
 Ste.
2600, Houston, TX 77056
	 	75-2575734	  	None
					
	 M.J. Electric, LLC
	 	Delaware	  	200 W. Frank Pipp Drive Iron Mountain, MI 49801	 	20-5565796	  	 Great Lakes Line Builders
  

M.J. Electric, LLC Iron Mountain
  

Iron Mountain M.J. Electric, LLC

					
	 M.J. Electric California, Inc.
	 	Delaware	  	 200 W. Frank Pipp
 Drive Iron
Mountain,
 MI 49801
	 	20-5770522	  	None
					
	 North Houston Pole Line, L.P.
	 	Texas	  	 1608 Margaret Street
 Houston,
TX 77093
	 	74-1675857	  	 Quanta Foundation Services
  

Quanta Foundation Services, Limited Partnership

					
	 PAR Electrical Contractors, Inc.
	 	Missouri	  	 4770 North Belleview
 Avenue,
Ste. 300
 Kansas City, MO 64116
	 	44-0591890	  	 Riggin & Diggin Line Construction, Inc.
  

Computapole
  
 Union Power Construction Company
  
 Seaward Corporation
  

Longfellow Drilling, Inc.
  
 Par Infrared Consultants

  
 3 

									
	 PRINCIPAL
	 	
JURISDICTION
OF FORMATION
	  	 LOCATION OF
CHIEF
 EXECUTIVE OFFICE

AND PRINCIPAL
 PLACE OF BUSINESS
	 	TAX ID NO.	  	 PRIOR NAMES OR TRADE
NAMES

	 Potelco, Inc.
	 	Washington	  	 14103
8th Street East

Sumner, WA 98390
	 	91-0784248	  	 Kingston Constructors, Inc.
  

Kuenzi Construction, Inc.
  
 NorAm Telecommunications, Inc.
  
 Potelco, Incorporated

					
	 Price Gregory Construction, Inc.
	 	Delaware	  	920 Memorial City Way, Ste. 600 Houston, TX 77024	 	76-0554270	  	None
					
	 Price Gregory International, Inc.
	 	Delaware	  	920 Memorial City Way, Ste. 600 Houston, TX 77024	 	73-1103884	  	None
					
	 Quanta Delaware, Inc.
	 	Delaware	  	 2800 Post Oak Blvd.,
 Ste.
2600, Houston, TX 77056
	 	51-6508285	  	None
					
	 Quanta Government Services, Inc.
	 	Delaware	  	2800 Post Oak Blvd., Suite 2600 Houston, Texas 77056	 	76-0605504	  	None
					
	 Quanta Government Solutions, Inc.
	 	Delaware	  	 2800 Post Oak Blvd., Ste. 2600

Houston, Texas 77056
	 	76-0612166	  	None
					
	 Quanta Power Generation, Inc.
	 	Delaware	  	 5445 DTC Parkway
 Ste. 1200
Greenwood Village, CO 80111
	 	26-2274603	  	 Quanta Renewable Energy Services, LLC
  

Quanta Renewable Energy
  
 Quanta Fossil Power
  

Quanta

					
	 Quanta Services Management Partnership, L.P.
	 	Texas	  	2800 Post Oak Blvd., Suite 2600 Houston, Texas 77056	 	76-0574732	  	None
					
	 Quanta Utility Installation Company, Inc.
	 	Delaware	  	2800 Post Oak Blvd., Suite 2600 Houston, Texas 77056	 	76-0592449	  	None
					
	 Quanta Utility Services-Gulf States, Inc.
	 	Delaware	  	 560 Lake Mirror Road
 College
Park, GA 30349
	 	76-0612175	  	DE Southeast Pipeline Construction, Inc

  
 4 

									
	 PRINCIPAL
	 	
JURISDICTION
OF FORMATION
	  	 LOCATION OF
CHIEF
 EXECUTIVE OFFICE

AND PRINCIPAL
 PLACE OF BUSINESS
	  	TAX ID NO.	  	 PRIOR NAMES OR TRADE
NAMES

	 Road Bore Corporation
	 	Hawaii	  	 91-230 Kuhela St.
 Kapolei, HI
96707
	  	99-0299930	  	None
					
	 Service Electric Company
	 	Delaware	  	 1621 East
25th Street

Chattanooga, TN 37404
	  	76-0644270	  	Quanta LXVI Acquisition, Inc.
					
	 Southwest Trenching Company, Inc.
	 	Texas	  	 1608 Margaret St.
 Houston,
Texas 77093
	  	76-0106600	  	None
					
	 Sumter Utilities, Inc.
	 	Delaware	  	 1151 North Pike West
 Sumter,
SC 29153
	  	76-0577089	  	Sumter Builders Construction Contracting
					
	 Sunesys, LLC
	 	Delaware	  	 185 Titus Avenue
 Warrington,
PA 18976
	  	20-5565929	  	Sunesys, LLC of Delaware
					
	 The Ryan Company, Inc.
	 	Massachusetts	  	 15 Commerce Way
 Norton, MA
02766
	  	04-2387367	  	 Eastern Communications Corp.
  

The Ryan Company, Inc. of Massachusetts
  

The Ryan Company of Massachusetts
  

Ryan Company Inc. (The)
  
 The Ryan Company Incorporated of Massachusetts
  
 The Ryan Company Incorporated Electrical Contractors

					
	 Tom Allen Construction Company
	 	Delaware	  	 411 Edwardsville Road
 Troy,
Illinois 62294
	  	76-0589277	  	 TA Construction
  

Allen Construction Company, Tom

					
	 Underground Construction Co., Inc.
	 	Delaware	  	 5145 Industrial Way
 Benicia,
CA 94510
	  	76-0575471	  	 Delaware Underground Construction Co.
  

Maryland Underground Construction Co., Inc.
  

Underground Construction Co., Inc. (Delaware)
  

UCC-Underground Construction Co., Inc.

  
 5 

									
	 PRINCIPAL
	  	
JURISDICTION
OF FORMATION
	  	 LOCATION OF
CHIEF
 EXECUTIVE OFFICE

AND PRINCIPAL
 PLACE OF BUSINESS
	  	TAX ID NO.	  	 PRIOR NAMES OR TRADE
NAMES

	 Utility Line Management Services, Inc.
	  	Delaware	  	4770 North Belleview Avenue, Suite 300 Kansas City, Missouri 64116-2188	  	76-0612162	  	None
					
	 Winco, Inc.
	  	Oregon	  	 22300 NE Yellow Gate Lane

Aurora, OR 97002
	  	93-1077101	  	Winco Powerline Services

  
 6 

 TRENCH OPEN BONDS 

(See Attached) 

[Schedules Omitted] 

  
 EXHIBIT D

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