FORM 4
[ X ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

INFRASTRUX HOLDINGS, LLC 		2. Issuer Name and Ticker or Trading Symbol

Willbros Group, Inc.NEW [ WG ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

C/O TENASKA CAPITAL MANAGEMENT, LLC, 14302 FNB PARKWAY 		3. Date of Earliest Transaction (MM/DD/YYYY)

7/12/2017
(Street)

OMAHA, NE 68154
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   7/12/2017     J (1)    8083235   D $0.00   (1) 60730   D    
Common Stock   7/12/2017     J (1)    394176   A $0.00   (1) 394176   I   By Tenaska Power Fund, L.P.  
Common Stock   7/12/2017     J (1)    13063   A $0.00   (1) 13063   I   By Tenaska PF G, LLC  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Explanation of Responses:
(1)  The shares were disposed of, or acquired, as applicable, pursuant to a distribution-in-kind to the partners of Tenaska Power Fund, L.P. ("TPF"), with TPF retaining ownership of shares for which the distribution was declined. TPF is the sole owner of TPF InfrastruX Holdings, LLC ("TPF Holdings") and the manager of InfrastruX Holdings, LLC ("IF Holdings"). TPF Holdings is the majority owner of IF Holdings. Tenaska PF G, LLC is a general partner of TPF. IF Holdings is the owner of the shares reported as disposed of herein. All other reporting persons disclaim beneficial ownership of shares reported hereby, except to the extent of any pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
INFRASTRUX HOLDINGS, LLC
C/O TENASKA CAPITAL MANAGEMENT, LLC
14302 FNB PARKWAY
OMAHA, NE 68154
X

TENASKA POWER FUND, LP
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68154
X

TENASKA PF G, LLC
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68154
X

TPF INFRASTRUX HOLDINGS, LLC
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68154
X


Signatures
David Dickey, Vice President & General Counsel, Tenaska PF G, LLC, General Partner of Tenaska Power Fund, L.P., Manager of INFRASTRUX HOLDINGS, LLC 7/14/2017
** Signature of Reporting Person Date

David Dickey, Vice President & General Counsel, Tenaska PF G, LLC, General Partner of Tenaska Power Fund, L.P., Manager of TPF INFRASTRUX HOLDINGS, LLC 7/14/2017
** Signature of Reporting Person Date

David Dickey, Vice President & General Counsel, Tenaska PF G, LLC, General Partner of Tenaska Power Fund, L.P. 7/14/2017
** Signature of Reporting Person Date

David Dickey, Vice President & General Counsel, Tenaska PF G, LLC 7/14/2017
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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