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        <PersonNm>Gretchen E May</PersonNm>
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        <PersonNm>Jarrod Dore</PersonNm>
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        <PersonNm>Mary Kaitlin O'Connor</PersonNm>
        <TitleTxt>Alternate Director</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Vito La Francesca</PersonNm>
        <TitleTxt>Director</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Christine Lau</PersonNm>
        <TitleTxt>Alternate Director</TitleTxt>
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        <PersonNm>Christopher Viney</PersonNm>
        <TitleTxt>Clerk/Director (start Jan 24)</TitleTxt>
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        <PersonNm>Mark Lukitsch</PersonNm>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>During the filing period, Gretchen May was paid by President and Fellows of Harvard College (Harvard) from the fees paid by the Members and served as the Longwood Medical Energy Collaborative, Inc. (LMEC) President and Executive Director during the year. Ms. May commenced that role on October 1, 2017, having previously served as a Project Development Director of LMEC since July 2011. At that time, the Executive Committee of LMEC had oversight for LMEC compensation matters. The Executive Committee reviewed and discussed the proposed compensation terms for the position and approved the compensation arrangements for the President and Executive Director. The Executive Committee then recommended the compensation arrangement to the Board of Directors for approval. The Executive Committee and Board of Director deliberations were documented in minutes, and the Board of Directors on behalf of the LMEC Member Organizations also ratified, approved, and confirmed the hiring and compensation of the Executive Director. Since that time, LMEC no longer has an Executive Committee. The process for reviewing and determining Ms. May's compensation is conducted by the Board of Directors as a whole.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>Various individuals included in Form 990, Part VII, participate in or receive payment from a supplemental non-qualified plan sponsored by related organizations. Each individual's participation in those plans arise in their capacity as employees or officers of those related organizations and are not compensation for services rendered to LMEC. Only the individuals mentioned below participated in or received compensation from non-qualified plans. Descriptions of the related-party non-qualified plans are as follows: The Children's Hospital Corporation made contributions to the supplemental non-qualified retirement plan for the individual listed below. Contribution amounts are generally based on a percentage of compensation. Participants of the supplemental executive retirement plan are fully vested. All payments with respect to a participant's separation from service will be made in a single sum following the separation from service unless participant has elected to receive the accrued interest portion of his or her account in three annual installments. Michele Garvin, received in 2023, a contribution of $123,124 Lisa Hogarty, received in 2023, a contribution of $58,941 Beth Israel Lahey Health (BILH) and its affiliates maintain certain supplemental non-qualified retirement plans. During the period covered by this filing, one or more individuals listed below, may have participated in one or more of the following plans, which under the definition to this Form 990 are supplemental nonqualified plans: Beth Israel Deaconess Medical Center Executive Retirement Program and Beth Israel Lahey Health, Inc. Supplemental Executive Retirement Plan. In addition, during the period covered by this filing, one or more individuals listed below may have participated in one or more of these additional IRC 457(b) plans and benefits from participating in one of these plans is also reported in this Form 990: Beth Israel Deaconess Medical Center 457(b) Plan, Beth Israel Lahey Health, Inc. 457(b) Deferred Compensation plan and Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center, Inc. 457(b) Deferred Compensation Plan. These plans are non-qualified deferred compensation plans and pursuant to the plans, eligible employees receive certain retirement benefits. Amounts received by participants, deferred by participants and the change in value of the plan benefits related to these participants' accounts are included in Form 990 Schedule J, Part II, Column B(iii), Other Reportable Compensation and/or Form 990, Schedule J, Part II, Column C, Deferred Compensation in accordance with the instructions to this Form 990. During the period covered by this return, there are no individuals who participated in these plans at BIDMC.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The following groups of individuals have business relationships with one another which arise from each set of individuals' mutual affiliation with one of LMEC's Member organizations: -- Jamie Katz, General Counsel of Beth Israel Lahey Health/Beth Israel Deaconess Medical Center, Inc. (BIDMC) and Jarrod Dore, Vice President Capital Facilities and Engineering of BIDMC; -- Malisa Schuyler, Vice President, Government Affairs of Beth Israel Lahey Health (BILH)/Joslin Diabetes Center, Inc. (Joslin), and Mark Lukitsch, Energy and Utilities Manager of BIDMC/Joslin, -- Bernard Jones, Vice President Value-Based Care, Public Policy and Administrative Operations of Brigham &amp; Women's Hospital, Inc. (BWH), Sonal Gandhi, Vice President, Real Estate, Planning &amp; Development of BWH, and George Player, Vice President, Facilities and Operations of BWH; -- Lisa Hogarty, Senior Vice President, Real Estate Planning and Development of The Children's Hospital Corporation, Mary Kaitlin O'Connor, Associate General Counsel of The Children's Hospital Corporation, Christopher Viney, General Counsel and Executive Director of Legal Services and Compliance of the Children's Hospital Corporation, and Michele Garvin, Senior Vice President and General Counsel of The Children's Hospital Corporation; -- Wendy Gettleman, Vice President, Facilities Management &amp; Real Estate of Dana-Farber Cancer Institute, Inc. (DFCI), Christine Lau, Assistant General Counsel of DFCI, and Vito La Francesca, Director of Engineering of DFCI; and, -- Douglas Garron, Managing Director of Energy and Facilities of Harvard University, and Steve Maiorisi, Chief Campus Planning and Facilities Officer of Harvard University.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The Members of the Organization are Beth Israel Deaconess Medical Center, Inc., Brigham and Women's Hospital, Inc., The Children's Hospital Corporation, Dana-Farber Cancer Institute, Inc., Joslin Diabetes Center, Inc., and President and Fellows of Harvard College. At any special or regular meeting the Members may increase the number of Members and elect new Members to complete the number so fixed by a vote of majority of the Members then in office; or they may decrease the number of Members, but only to eliminate vacancies caused by the resignation, removal, or disqualification of one or more Members. Membership in the Organization shall be limited to organizations that are exempt from federal income taxation pursuant to the provisions of Section 501(c)(3) of the Internal Revenue Code. Each Member shall continue to be a Member until it dissolves, resigns, is removed, or becomes disqualified.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>LMEC has six (6) Member Corporations, each of which is a corporation that is exempt from federal income taxation pursuant to the provisions of Section 501(c)(3) of the Internal Revenue Code. Under the LMEC governing documents, each member appoints two directors to sit on the LMEC governing board. Each director is to have the following qualifications: (1) at least one director shall be from such Member's senior management or the parent organization of such Member, and (2) the other director shall be from such Member's senior management or the parent organization of such Member or shall be a member of the governing board of the Member. Each Member may appoint an alternate to attend and vote at meetings of the Board of Directors in the absence of either or both of the directors it appoints. The bylaws provide that the Directors appointed by each Member jointly have one vote, and in the event of any disagreement between such directors, the vote of such Member shall be disregarded. An appointed Director may be suspended or removed with or without cause by the Member that appointed such Director.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>The authority of the Directors to exercise the following powers is conditioned upon approval by two-thirds of the total of the Members: a. To add new Members b. To change capital call obligations of the Members, if any c. To refinance or approve any unbudgeted debt instruments, bonds, notes, or guarantees d. To enter into or renegotiate any mortgages on or security interest in the Corporation's real property or physical plant, except for those mortgages or material liens entered into pursuant to previously approved financings. e. To add new customers f. To change auditors g. To file for bankruptcy h. To employ or terminate employment of the chief executive officer or chief financial officer of the Corporation. i. To make material changes in the sale or repurchase of energy from third parties j. To approve or make material changes to any standard user contract In addition to these reserved powers, the Members shall have such other powers and rights as the Directors may designate.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990, prepared by an independent public accounting firm, is reviewed by the President of Longwood Medical Energy Collaborative, Inc. ("LMEC"). The complete Form 990 is presented to the Audit and Finance Committee of LMEC for review and discussion. A copy of the complete return is then provided to each member of the LMEC Board of Directors who reviews and approves it prior to submission to the Internal Revenue Service.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Longwood Medical Energy Collaborative, Inc. (LMEC) has a conflict of interest policy which establishes that directors, officers, and other necessary individuals have an ongoing duty to disclose the existence of financial interests which may result in a conflict of interest. To administer the conflict of interest policy, annually LMEC distributes a copy of the policy along with a conflict of interest form. The conflict of interest form must be returned by each such individual annually to affirm that he or she (i) has received a copy of the conflict of interest policy, (ii) has read and understands the policy, and (iii) has agreed to comply with the policy. Any activity that requires action under the conflict of interest policy is subject to review and action through the Board of Directors and the organization's general counsel. Pursuant to the conflict of interest policy, certain activities which could create conflicts of interest are prohibited while other types of relationships are permitted, subject to compliance with disclosure and recusal requirements.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>During the filing period, Gretchen May was paid by President and Fellows of Harvard College (Harvard) from the fees paid by the Members and served as the Longwood Medical Energy Collaborative, Inc. (LMEC) President and Executive Director during the year. Ms. May commenced that role on October 1, 2017, having previously served as a Project Development Director of LMEC since July 2011. At that time, the Executive Committee of LMEC had oversight for LMEC compensation matters. The Executive Committee reviewed and discussed the proposed compensation terms for the position and approved the compensation arrangements for the President and Executive Director. The Executive Committee then recommended the compensation arrangement to the Board of Directors for approval. The Executive Committee and Board of Director deliberations were documented in minutes, and the Board of Directors on behalf of the LMEC Member Organizations also ratified, approved, and confirmed the hiring and compensation of the Executive Director. Since that time, LMEC no longer has an Executive Committee. The process for reviewing and determining Ms. May's compensation is conducted by the Board of Directors as a whole. During the period covered by this filing, LMEC did not pay any other officers or key employees.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization makes its governing documents, conflict of interest policy, and financial statements available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section A:</FormAndLineReferenceDesc>
        <ExplanationTxt>Director Compensation: A majority of the Organization's directors are compensated by related organizations, as they serve as representatives of the Organization's supported organizations. However, the compensation reported in Part VII of Form 990 does not represent compensation for the individuals' services in their capacity as officers or directors of Longwood Medical Energy Collaborative. Rather, this compensation reflects remuneration for services those individuals performed in their capacity as full-time employees of those related organizations. Directors Jamie Katz, and Malisa Schuyler receive compensation from Beth Israel Lahey Health (BILH), which is the parent organization of Beth Israel Deaconess Medical Center and Joslin Diabetes Center, Inc. However, per the definition of a related party in the IRS instructions, BILH is not related to Longwood Medical Energy Collaborative, Inc. As these individuals are not being compensated in their capacity as board members of LMEC and BILH is not related to LMEC, no compensation has been reported to them in Part VII or Schedule J.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Energy Conservation and Efficiency Services: Program service expenses 868,791. Management and general expenses 0. Fundraising expenses 0. Total expenses 868,791.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, Line 2c:</FormAndLineReferenceDesc>
        <ExplanationTxt>Oversight of Audit The Organization has an audit and finance committee that performs general oversight of the audit process. The audit process has not changed from the prior year.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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          <BusinessNameLine1Txt>Beth Israel Deaconess Medical Center Inc</BusinessNameLine1Txt>
        </DisregardedEntityName>
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          <AddressLine1Txt>330 Brookline Avenue</AddressLine1Txt>
          <CityNm>Boston</CityNm>
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          <ZIPCd>02215</ZIPCd>
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        <EIN>042103881</EIN>
        <PrimaryActivitiesTxt>Tertiary Care Academic Medical Center</PrimaryActivitiesTxt>
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          <CityNm>Boston</CityNm>
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          <ZIPCd>02215</ZIPCd>
        </USAddress>
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        <PrimaryActivitiesTxt>Education Research Healthcare Facility</PrimaryActivitiesTxt>
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          <AddressLine1Txt>300 Longwood Avenue</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02215</ZIPCd>
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        <EIN>042774441</EIN>
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          <CityNm>Cambridge</CityNm>
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          <ZIPCd>02138</ZIPCd>
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        <PublicCharityStatusTxt>Line 2</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>Dana Farber Cancer Institute Inc</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>450 Brookline Avenue</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02215</ZIPCd>
        </USAddress>
        <EIN>042263040</EIN>
        <PrimaryActivitiesTxt>Education Research Healthcare Facility</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 7</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>Brigham &amp; Women's Hospital Inc</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>75 Francis Street</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <EIN>042312909</EIN>
        <PrimaryActivitiesTxt>Please see Schedule R, Part VII, Supplemental Information</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 3</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>Mass General Brigham</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>1</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>1</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>1</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule R, Part II, Brigham &amp; Women's Hospital:</FormAndLineReferenceDesc>
        <ExplanationTxt>Throughout Brigham Health, every decision we make is guided by our vision of a healthier world, and delivered through our mission of maintaining and restoring health through leadership in compassionate care, scientific discovery and education.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
  </ReturnData>
</Return>