Ownership Submission
FORM 4
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
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, 1044 N 115TH STREET, SUITE 400
3. Date of Earliest Transaction (Month/Day/Year)
05/24/2012
(Street)

OMAHA, NE 68154-4446
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 05/24/2012   A   27,272 A $ 0 7,963,590 D (1)  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
INFRASTRUX HOLDINGS, LLC
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68154-4446
    X    
TPF POWER, INC.
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68154-4446
    X    
TPF INFRASTRUX HOLDINGS, LLC
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68154-4446
    X    
TENASKA POWER FUND, LP
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68154-4446
    X    
TENASKA PF G, LLC
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68154-4446
    X    
TENASKA PF, INC.
C/O TENASKA CAPITAL MANAGEMENT, LLC
1044 N 115TH STREET, SUITE 400
OMAHA, NE 68254-4446
    X    

Signatures

 Ryan T. Schroer, Senior Vice President of TPF Power, Inc., Manager of INFRASTRUX HOLDINGS, LLC   05/29/2012
**Signature of Reporting Person Date

 Ryan T. Schroer, Senior Vice President of TPF POWER, INC.   05/29/2012
**Signature of Reporting Person Date

 Ryan T. Schroer, Senior Vice President of TPF Power, Inc., Manager of TPF INFRASTRUX HOLDINGS, LLC   05/29/2012
**Signature of Reporting Person Date

 Ryan T. Schroer, Senior Vice President of Tenaska PF, Inc., Manager of Tenaska PF G LLC, General Partner of TENASKA POWER FUND, L.P.   05/29/2012
**Signature of Reporting Person Date

 Ryan T. Schroer, Senior Vice President of Tenaska PF, Inc., Manager of TENASKA PF G, LLC   05/29/2012
**Signature of Reporting Person Date

 Ryan T. Schroer, Senior Vice President of TENASKA PF, INC.   05/29/2012
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) These shares are indirectly owned by TPF Power, Inc., the manager of InfrastruX Holdings, LLC, the majority of InfrastruX Holdings, LLC, Tenaska Power Fund, L.P., the sole owner of TPF InfrastruX Holdings, LLC, Tenaska PF G, LLC, the general partner of Tenaska Power Fund, L.P., and Tenaska PF, Inc., the manager of Tenaska PF G, LLC. These entities may be deemed indirect beneficial owners of the reported securities.

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