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      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
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    <IRS990ScheduleO documentId="R000002" softwareId="24021167" softwareVersionNum="v1.00">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Header, Line K</FormAndLineReferenceDesc>
        <ExplanationTxt>A network of companies partnering with DOE</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>EFCOG's objective is to promote excellence in all aspects of the operation, management, and integration of U.S. Department of Energy (DOE) National Nuclear Security Administration (NNSA) facilities. The member companies work to improve safety, security, environmental protection and overall efficiency for the government. EFCOG provides tools and metrics to its members to measure and communicate progress in each of the key areas of safety, security, project management, infrastructure management, quality, energy efficiency, human capital, and waste management.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>DJ Johnson, Honeywell Federal Solutions; Mark Whitney, Amentum; Colby Yeary, PanTeXas Deterrence, LLC; Juan Alvarez, Brookhaven National Laboratory; Amy Basche, Hanford Mission Integration Solutions; David Campbell, EnergySolutions; Mark Davis, Los Alamos National Laboratory; Randy Hansen, Pacific Northwest National Laboratory; Karen Harris, Boston Government Services; Michael Lempke, Huntington Ingalls Industries; Dana Hewit, Battelle Savannah River Alliance/SRNL; Robert Miklos, Veolia Nuclear Solutions; Myrna Redfield, Four Rivers Nuclear Partnership; Matt Moury, Fluor Federal Services; Brad Smith, N3B; Ben Souther, Bechtel National, Inc.; Jeff Stevens, BWXT Technical Services Group, Inc; David Teter, Idaho National Laboratory.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>Any DOE prime contractor may join EFCOG and each company is allotted one company representative who becomes the voting member for their company.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors reviews the budget for each year and presents it to the members at the annual meeting for approval. In addition, changes to the EFCOG Charter and By-laws are presented to and approved by the members at the annual meeting.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 8b</FormAndLineReferenceDesc>
        <ExplanationTxt>EFCOG does not have independent committees within its governing body.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>DJ Johnson, Honeywell Federal Solutions; Mark Whitney, Amentum; Colby Yeary, PanTeXas Deterrence, LLC; Juan Alvarez, Brookhaven National Laboratory; Amy Basche, Hanford Mission Integration Solutions; David Campbell, EnergySolutions; Mark Davis, Los Alamos National Laboratory; Randy Hansen, Pacific Northwest National Laboratory; Karen Harris, Boston Government Services; Michael Lempke, Huntington Ingalls Industries; Dana Hewit, Battelle Savannah River Alliance/SRNL; Robert Miklos, Veolia Nuclear Solutions; Myrna Redfield, Four Rivers Nuclear Partnership; Matt Moury, Fluor Federal Services; Brad Smith, N3B; Ben Souther, Bechtel National, Inc.; Jeff Stevens, BWXT Technical Services Group, Inc; David Teter, Idaho National Laboratory.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>None</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>efcog.org</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>Travel and Other Direct Costs</ExplanationTxt>
      </SupplementalInformationDetail>
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</Return>