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Exhibit 99.1
 WILLBROS GROUP, INC.
    
    (WILLBROS LOGO)
 CONTACT:
    
    Michael W. CollierVice President,Investor RelationsNEWS RELEASE
    
    
    
    Willbros USA, Inc.(713) 403-8016Connie DeverDirector, Strategic PlanningFOR IMMEDIATE RELEASE
    
    
    
    Willbros USA, Inc.(713) 403-8035
 WILLBROS REPORTS RESULTS FOR FIRST QUARTER OF 2007
 HOUSTON, TX May 9, 2007
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First Quarter 2007 Continuing Operations
  First Quarter 2007 Discontinued Operations
  Backlog (1)
  CONFERENCE CALL
  What:
    
    Willbros Group, Inc. First Quarter of 2007 Conference CallWhen:
    
    Thursday, May 10, 2007  9:00 a.m. Eastern TimeWhere:
    
    Live via phone by dialing 888-562-3356 and using the passcode
8756038 or asking for the Willbros call at least 10 minutes prior
to the start time. Or live over the Internet by logging on to the
web address below.
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Where:
    
    http://www.willbros.com. The webcast can be accessed from the home page.
  www.willbros.com.
 This announcement contains forward-looking statements. All statements, other than statements
of historical facts, which address activities, events or developments the Company expects or
anticipates will or may occur in the future, are forward-looking statements. A number of risks and
uncertainties could cause actual results to differ materially from these statements, including
those discussed above and such things as the potential for additional investigations; the possible
losses arising from the discontinuation of operations and the sale of the Nigeria assets; fines and
penalties by government agencies; the outcome of the current Securities and Exchange Commission,
Office of Foreign Assets Control and Department of Justice investigations; the identification of
one or more other issues that require restatement of one or more prior period financial statements;
the existence of material weaknesses in internal controls over financial reporting; availability of
quality management; availability and terms of capital; changes in, or the failure to comply with,
government regulations; ability to remain in compliance with, or obtain waivers under, the
Companys loan agreements and indentures; the promulgation, application, and interpretation of
environmental laws and regulations; future E&P capital expenditures, oil, gas, gas liquids and
power prices and demand, the amount and location of planned pipelines, the effective tax rate of
the different countries where the work is being conducted, development trends of the oil, gas and
power industries, changes in the political and economic environment of the countries in which the
Company has operations, as well as other risk factors described from time to time in the Companys
documents and reports filed with the SEC. The Company assumes no obligation to update publicly
such forward-looking statements, whether as a result of new information, future events or
otherwise.
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WILLBROS GROUP, INC.
(In Thousands, Except Per Share Amounts)
 Three Months EndedMarch 312007
    
    
    2006Statement of Income DataContract revenueConstruction
    
    $
    170,705
    
    
    $
    79,147Engineering
    
    
    19,655
    
    
    
    15,481EPC
    
    
    16,349
    
    
    
    12,958206,709
    
    
    
    107,586Contract costConstruction
    
    
    165,004
    
    
    
    76,708Engineering
    
    
    15,589
    
    
    
    13,571EPC
    
    
    13,239
    
    
    
    11,181193,832
    
    
    
    101,460Contract incomeConstruction
    
    
    5,701
    
    
    
    2,439Engineering
    
    
    4,066
    
    
    
    1,910EPC
    
    
    3,110
    
    
    
    1,77712,877
    
    
    
    6,126Depreciation and amortization
    
    
    3,456
    
    
    
    3,005General and administrative
    
    
    11,425
    
    
    
    10,407Operating income (loss)
    
    
    (2,004
    )
    
    
    (7,286
    )Other income (expense):Interest  net
    
    
    (890
    )
    
    
    (1,636
    )Other  net
    
    
    (190
    )
    
    
    126(1,080
    )
    
    
    (1,510
    )Income (loss) before income taxes
    
    
    (3,084
    )
    
    
    (8,796
    )Provision (benefit) for income taxes
    
    
    255
    
    
    
    (255
    )Loss from continuing operations
    
    
    (3,339
    )
    
    
    (8,541
    )Income (loss) from discontinued operations
    
    
    (8,508
    )
    
    
    3,948Net income (loss)
    
    $
    (11,847
    )
    
    $
    (4,593
    )Basic income (loss) per shareContinuing operations
    
    $
    (.13
    )
    
    $
    (.40
    )Discontinued operations
    
    
    (.33
    )
    
    
    .18$
    (.46
    )
    
    $
    (.22
    )Diluted income (loss) per shareContinuing operations
    
    $
    (.13
    )
    
    $
    (.40
    )Discontinued operations
    
    
    (.33
    )
    
    
    .18$
    (.46
    )
    
    $
    (.22
    )Cash Flow DataContinuing operations:Cash provided by (used in):Operating activities
    
    $
    (7,340
    )
    
    $
    (1,734
    )Investing activities
    
    
    128,788
    
    
    
    17,663Financing activities
    
    
    (4,185
    )
    
    
    14,581Foreign exchange effects
    
    
    183
    
    
    
    40Discontinued operations
    
    
    (9,650
    )
    
    
    (29,434
    )Other Data (Continuing Operations)Weighted average shares outstanding:Basic
    
    
    25,504
    
    
    
    21,346Diluted
    
    
    25,504
    
    
    
    21,346EBITDA (2)
    
    $
    1,262
    
    
    $
    (4,155
    )Capital expenditures
    
    
    (2,502
    )
    
    
    (3,563
    )Reconciliation of Non-GAAP Financial MeasureNet loss, continuing operations
    
    $
    (3,339
    )
    
    $
    (8,541
    )Interest  net
    
    
    890
    
    
    
    1,636Income taxes
    
    
    255
    
    
    
    (255
    )Depreciation and amortization
    
    
    3,456
    
    
    
    3,005EBITDA (2)
    
    $
    1,262
    
    
    $
    (4,155
    )
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Three Months EndedMarch 312007
    
    
    2006Balance Sheet Data
    
    
    3/31/2007
    
    
    
    12/31/2006Cash and cash equivalents
    
    $
    145,439
    
    
    $
    37,643Working capital
    
    
    161,046
    
    
    
    170,825Total assets
    
    
    410,714
    
    
    
    588,254Total debt
    
    
    175,581
    
    
    
    167,139Stockholders equity
    
    
    84,569
    
    
    
    97,931Backlog Data (1)By Reporting Segment:Construction
    
    $
    397,080
    
    
    $
    320,461Engineering
    
    
    92,615
    
    
    
    109,122EPC
    
    
    158,594
    
    
    
    172,689$
    648,289
    
    
    $
    602,272By Geographic Area:North America
    
    $
    611,630
    
    
    $
    565,408Middle East
    
    
    36,659
    
    
    
    36,864$
    648,289
    
    
    $
    602,272
 
 (1)
    
    Backlog is anticipated contract revenue from projects for which award is either in hand or
assured.(2)
    
    EBITDA is earnings before net interest, income taxes and depreciation and
amortization. EBITDA as presented may not be comparable to other similarly titled
measures reported by other companies. The Company believes EBITDA is a useful
measure of evaluating its financial performance because of its focus on the Companys
results from operations before net interest, income taxes, depreciation and
amortization. EBITDA is not a measure of financial performance under generally
accepted accounting principles. However, EBITDA is a common alternative measure of
operating performance used by investors, financial analysts and rating agencies. A
reconciliation of EBITDA to net income is included in the exhibit to this
release. ###
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