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        <FormAndLineReferenceDesc>Form 990, Header, Line K</FormAndLineReferenceDesc>
        <ExplanationTxt>A network of companies partnering with DOE</ExplanationTxt>
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        <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>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>David Blevins, Jacobs Engineering Group; Jack Craig, AtkinsRealis US Nuclear; Sharon Marra, Alliance for Sustainable Energy, LLC (NREL); Eric Papaioannou, Idaho National Laboratory; Mark Peters, Brookhaven National Laboratory; Mike Schlender , Pacific Northwest National Laboratory ; Robert Wilkinson , Hanford Mission Integration Solutions ; Jeff Stevens , N3B ; Sandra Fairchild , UCOR ; DJ Johnson , Honeywell Federal Solutions ; Billy Morrison , EnergySolutions ; Jeff Stevens , BWXT Technical Services Group, Inc. ; Mark Whitney , Amentum ; Kelly Beierschmitt , Los Alamos National Laboratory ; Michael Lempke , Huntington Ingalls Industries ; Greg Meyer , Fluor Federal Services ; Dena Volovar , Bechtel National, Inc.</ExplanationTxt>
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      <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>
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      <SupplementalInformationDetail>
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        <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>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>EFCOG does not have independent committees within its governing body.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Kelly Beierschmitt , Los Alamos National Laboratory ; David Blevins , Jacobs Engineering Group ; Jack Craig , AtkinsRealis US Nuclear ; Sandra Fairchild , UCOR ; DJ Johnson , Honeywell Federal Solutions ; Michael Lempke , Huntington Ingalls Industries ; Sharon Marra , Alliance for Sustainable Energy, LLC (NREL) ; Greg Meyer , Fluor Federal Services ; Billy Morrison , EnergySolutions ; Eric Papaioannou , Idaho National Laboratory ; Mark Peters , Brookhaven National Laboratory ; Mike Schlender , Pacific Northwest National Laboratory ; Jeff Stevens , N3B ; Jeff Stevens , BWXT Technical Services Group, Inc. ; Dena Volovar , Bechtel National, Inc. ; Mark Whitney , Amentum ; Robert Wilkinson , Hanford Mission Integration Solutions</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, Other Direct Costs, and Membership Refund</ExplanationTxt>
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