UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-Q/A

[X]     QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934

                  For the Quarterly Period Ended June 30, 2003

                                       OR

[ ]     TRANSITION  REPORT  PURSUANT TO SECTION 13 OR 15(d) OF THE  SECURITIES
        EXCHANGE ACT OF 1934

Commission Name of Registrant; State of Incorporation; IRS Employer File Number Address of Principal Executive Offices; and Identification Telephone Number Number - --------------------- --------------------------------------------------------- ------------------------ 1-16169 EXELON CORPORATION 23-2990190 (a Pennsylvania corporation) 10 South Dearborn Street - 37th Floor P.O. Box 805379 Chicago, Illinois 60680-5379 (312) 394-7398 1-1839 COMMONWEALTH EDISON COMPANY 36-0938600 (an Illinois corporation) 10 South Dearborn Street - 37th Floor P.O. Box 805379 Chicago, Illinois 60680-5379 (312) 394-4321 1-1401 PECO ENERGY COMPANY 23-0970240 (a Pennsylvania corporation) P.O. Box 8699 2301 Market Street Philadelphia, Pennsylvania 19101-8699 (215) 841-4000 333-85496 EXELON GENERATION COMPANY, LLC 23-3064219 (a Pennsylvania limited liability company) 300 Exelon Way Kennett Square, Pennsylvania 19348 (610) 765-6900
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [_]. The number of shares outstanding of each registrant's common stock as of June 30, 2003 was: Exelon Corporation Common Stock, without par value 325,848,491 Commonwealth Edison Company Common Stock, $12.50 par value 127,016,429 PECO Energy Company Common Stock, without par value 170,478,507 Exelon Generation Company, LLC not applicable Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act). Exelon Corporation Yes [X] No [ ] Commonwealth Edison Company, PECO Energy Company and Exelon Generation Company, LLC Yes [ ] No [X]. TABLE OF CONTENTS Page No. -------- FILING FORMAT 3 EXPLANATORY NOTE 3 PART I. FINANCIAL INFORMATION 4 ITEM 4. CONTROLS AND PROCEDURES 4 PART II. OTHER INFORMATION 8 ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K 8 SIGNATURES 11 2 FILING FORMAT This combined Form 10-Q/A is being filed separately by Exelon Corporation (Exelon), Commonwealth Edison Company (ComEd), PECO Energy Company (PECO) and Exelon Generation Company, LLC (Generation) (Registrants). Information contained herein relating to any individual registrant has been filed by such registrant on its own behalf. No registrant makes any representation as to information relating to any other registrant. EXPLANATORY NOTE Exelon, ComEd, PECO and Generation are filing this amendment on Form 10-Q /A in response to comments received from the staff of the Securities and Exchange Commission (SEC) in connection with its review of Exelon's Registration Statement on Form S-3 (File No. 333-108546), which incorporates this quarterly report by reference. This amendment makes changes to Part I, Item 4. Controls and Procedures to confirm that each Registrant's disclosure controls and procedures are effective and to clarify that each Registrant's access and ability to apply its disclosure controls and procedures to entities that it does not control or manage are more limited than subsidiaries that it controls and manages. Unless otherwise stated, all information contained in this amendment is as of July 30, 2003, the filing date of our original Quarterly Report on Form 10-Q for the quarter ended June 30, 2003. 3 PART I. FINANCIAL INFORMATION ITEM 4. CONTROLS AND PROCEDURES Exelon During the second quarter of 2003, Exelon's management, including the principal executive officer and principal financial officer, evaluated Exelon's disclosure controls and procedures related to the recording, processing, summarization and reporting of information in Exelon's periodic reports that it files with the SEC. These disclosure controls and procedures have been designed to ensure that (a) material information relating to Exelon, including its consolidated subsidiaries, is made known to Exelon's management, including these officers, by other employees of Exelon and its subsidiaries, and (b) this information is recorded, processed, summarized, evaluated and reported, as applicable, within the time periods specified in the SEC's rules and forms. Due to the inherent limitations of control systems, not all misstatements may be detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple error or mistake. Additionally, controls could be circumvented by the individual acts of some persons or by collusion of two or more people. Exelon's controls and procedures can only provide reasonable, not absolute, assurance that the above objectives have been met. Exelon does not control or manage certain of its unconsolidated entities and thus its access and ability to apply its disclosure controls and procedures to entities that it does not control or manage are more limited than is the case for the subsidiaries it controls and manages. Accordingly, as of June 30, 2003, these officers (principal executive officer and principal financial officer) concluded that Exelon's disclosure controls and procedures were effective to accomplish their objectives. Exelon continually strives to improve its disclosure controls and procedures to enhance the quality of its financial reporting and to maintain dynamic systems that change as conditions warrant. In the second quarter of 2003, Exelon implemented a new general ledger accounting system. The new general ledger system was implemented in order to provide a consistent system platform for the affiliated Exelon companies and to enhance management reporting and analysis. This change in systems was subject to thorough testing and review by internal and external parties both before and after final implementation. Exelon continually strives to improve its internal control over financial reporting to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles (GAAP). ComEd During the second quarter of 2003, ComEd's management, including the principal executive officer and principal financial officer, evaluated ComEd's disclosure controls and procedures related to the recording, processing, summarization and reporting of information in ComEd's periodic reports that it files with the SEC. These disclosure controls and procedures have been designed to ensure that (a) material information relating to ComEd, including its consolidated subsidiaries, is made known to ComEd's management, including these officers, by other employees of ComEd and its subsidiaries, and (b) this information is recorded, processed, 4 summarized, evaluated and reported, as applicable, within the time periods specified in the SEC's rules and forms. Due to the inherent limitations of control systems, not all misstatements may be detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple error or mistake. Additionally, controls could be circumvented by the individual acts of some persons or by collusion of two or more people. ComEd's controls and procedures can only provide reasonable, not absolute, assurance that the above objectives have been met. ComEd does not control or manage certain of its unconsolidated entities and thus its access and ability to apply its disclosure controls and procedures to entities that it does not control or manage are more limited than is the case for the subsidiaries it controls and manages. Accordingly, as of June 30, 2003, these officers (principal executive officer and principal financial officer) concluded that ComEd's disclosure controls and procedures were effective to accomplish their objectives. ComEd continually strives to improve its disclosure controls and procedures to enhance the quality of its financial reporting and to maintain dynamic systems that change as conditions warrant. In the second quarter of 2003, ComEd implemented a new general ledger accounting system. The new general ledger system was implemented in order to provide a consistent system platform for the affiliated Exelon companies and to enhance management reporting and analysis. This change in systems was subject to thorough testing and review by internal and external parties both before and after final implementation. ComEd continually strives to improve its internal control over financial reporting to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP. PECO During the second quarter of 2003, PECO's management, including the principal executive officer and principal financial officer, evaluated PECO's disclosure controls and procedures related to the recording, processing, summarization and reporting of information in PECO's periodic reports that it files with the SEC. These disclosure controls and procedures have been designed to ensure that (a) material information relating to PECO, including its consolidated subsidiaries, is made known to PECO's management, including these officers, by other employees of PECO and its subsidiaries, and (b) this information is recorded, processed, summarized, evaluated and reported, as applicable, within the time periods specified in the SEC's rules and forms. Due to the inherent limitations of control systems, not all misstatements may be detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple error or mistake. Additionally, controls could be circumvented by the individual acts of some persons or by collusion of two or more people. PECO's controls and procedures can only provide reasonable, not absolute, assurance that the above objectives have been met. PECO does not control or manage certain of its unconsolidated entities and thus its access and ability to apply its disclosure controls and procedures to entities that it does not control or manage are more limited than is the case for the subsidiaries it controls and manages. 5 Accordingly, as of June 30, 2003, these officers (principal executive officer and principal financial officer) concluded that PECO's disclosure controls and procedures were effective to accomplish their objectives. PECO continually strives to improve its disclosure controls and procedures to enhance the quality of its financial reporting and to maintain dynamic systems that change as conditions warrant. In the second quarter of 2003, PECO implemented a new general ledger accounting system. The new general ledger system was implemented in order to provide a consistent system platform for the affiliated Exelon companies and to enhance management reporting and analysis. This change in systems was subject to thorough testing and review by internal and external parties both before and after final implementation. PECO continually strives to improve its internal control over financial reporting to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP. Generation During the second quarter of 2003, Generation's management, including the principal executive officer and principal financial officer, evaluated Generation's disclosure controls and procedures related to the recording, processing, summarization and reporting of information in Generation's periodic reports that it files with the SEC. These disclosure controls and procedures have been designed to ensure that (a) material information relating to Generation, including its consolidated subsidiaries, is made known to Generation's management, including these officers, by other employees of Generation and its subsidiaries, and (b) this information is recorded, processed, summarized, evaluated and reported, as applicable, within the time periods specified in the SEC's rules and forms. Due to the inherent limitations of control systems, not all misstatements may be detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple error or mistake. Additionally, controls could be circumvented by the individual acts of some persons or by collusion of two or more people. Generation's controls and procedures can only provide reasonable, not absolute, assurance that the above objectives have been met. Generation does not control or manage certain of its unconsolidated entities and thus its access and ability to apply its disclosure controls and procedures to entities that it does not control or manage are more limited than is the case for the subsidiaries it controls and manages. Accordingly, as of June 30, 2003, these officers (principal executive officer and principal financial officer) concluded that Generation's disclosure controls and procedures were effective to accomplish their objectives. Generation continually strives to improve its disclosure controls and procedures to enhance the quality of its financial reporting and to maintain dynamic systems that change as conditions warrant. 6 In the second quarter of 2003, Generation implemented a new general ledger accounting system. The new general ledger system was implemented in order to provide a consistent system platform for the affiliated Exelon companies and to enhance management reporting and analysis. This change in systems was subject to thorough testing and review by internal and external parties both before and after final implementation. Generation continually strives to improve its internal control over financial reporting to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP. 7 PART II. OTHER INFORMATION ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K (a) Exhibits: 4-1 - Indenture to Subordinated Debt Securities dated as of June 24, 2003 between PECO Energy Company, as Issuer, and Wachovia Bank National Association, as Trustee.* 4-2 - Preferred Securities Guarantee Agreement between PECO Energy Company, as Guarantor, and Wachovia Trust Company, National Association, as Trustee, dated as of June 24, 2003.* 4-3 - PECO Energy Capital Trust IV Amended and Restated Declaration of Trust among PECO Energy Company, as Sponsor, Wachovia Trust Company, National Association, as Delaware Trustee and Property Trustee, and J. Barry Mitchell, George R. Shicora and Charles S. Walls as Administrative Trustees dated as of June 24, 2003.* Certifications Pursuant to Rule 13a-14(a) and 15d-14(a) of the Securities and Exchange Act of 1934 as to the Quarterly Report on Form 10-Q/A for the quarterly period ended June 30, 2003 filed by the following officers for the following companies: ----------------------------------------------------------------------------- 31-1 - Filed by John W. Rowe for Exelon Corporation 31-2 - Filed by Robert S. Shapard for Exelon Corporation 31-3 - Filed by Michael B. Bemis for Commonwealth Edison Company 31-4 - Filed by J. Barry Mitchell for Commonwealth Edison Company 31-5 - Filed by Michael B. Bemis for PECO Energy Company 31-6 - Filed by J. Barry Mitchell for PECO Energy Company 31-7 - Filed by Oliver D. Kingsley Jr. for Exelon Generation Company, LLC 31-8 - Filed by J. Barry Mitchell for Exelon Generation Company, LLC ----------------------------------------------------------------------------- Certifications Pursuant to Section 1350 of Chapter 63 of Title 18 United States Code (Sarbanes - Oxley Act of 2002) as to the Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003 filed by the following officers for the following companies:* ----------------------------------------------------------------------------- 32-1 - Filed by John W. Rowe for Exelon Corporation 32-2 - Filed by Robert S. Shapard for Exelon Corporation 32-3 - Filed by Michael B. Bemis for Commonwealth Edison Company 32-4 - Filed by Robert S. Shapard for Commonwealth Edison Company 32-5 - Filed by Michael B. Bemis for PECO Energy Company 32-6 - Filed by Robert S. Shapard for PECO Energy Company 32-7 - Filed by Oliver D. Kingsley Jr. for Exelon Generation Company, LLC 32-8 - Filed by Robert S. Shapard for Exelon Generation Company, LLC ----------------------------------------------------------------------------- * Exhibits were filed with the Form 10-Q for the quarterly period ended June 30, 2003 filed on July 30, 2003 (File No. 1-16169, June 30, 2003 Form 10-Q, Exhibits 4-1 through 32-8). 8 (b) Reports on Form 8-K: Exelon, ComEd, PECO and/or Generation filed Current Reports on Form 8-K during the three months ended June 30, 2003 regarding the following items:
Date of Earliest Event Reported Description of Item Reported - ------------------------------------------------------------------------------------------------------------ April 3, 2003 "ITEM 9. REGULATION FD DISCLOSURE" filed for Exelon, ComEd, PECO and Generation regarding a presentation by John W. Rowe, Chairman and CEO, at the Berenson & Company and The Williams Capital Group Midwest Utilities Seminar. The exhibits include the slides used during the presentation. April 7, 2003 "ITEM 5. OTHER EVENTS" filed by ComEd regarding the issuance of $395 million in First Mortgage Bonds. April 28, 2003 "ITEM 9. REGULATION FD DISCLOSURE" filed under Item 9 in compliance with Item 12 for Exelon, ComEd, PECO and Generation regarding the first quarter 2003 earnings release and items discussed during the earnings conference call. Also included as an exhibit to this report was a new release regarding the "Exelon Way" business model. May 2, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon regarding Richard H. Glanton's acceptance of the position of Senior Vice President, Corporate Development and his relinquishment of his directorship on the Exelon Board. May 7, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon, PECO and Generation announcing that the U.S. Nuclear Regulatory Commission approved a 20-year extension of the operating licenses for Exelon Nuclear's Peach Bottom Atomic Power Station. May 20, 2003 "ITEM 9. REGULATION FD DISCLOSURE" filed for Exelon regarding a presentation by Robert S. Shapard, Executive Vice President and CFO. The exhibit includes the slides used during the presentation. May 29, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and Generation announcing the issuance of a call notice for the remaining 50.1% interest in Sithe Energies, Inc. June 2, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and Generation regarding a request for an amendment to the Exelon Boston Generating, LLC credit facility and the construction of the Mystic 8 and 9 and Fore River generating units. June 2, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and Generation regarding the approval of an amendment to the Exelon Boston 9 Generating, LLC credit facility. June 11, 2003 "ITEM 9. REGULATION FD DISCLOSURE" filed for Exelon, ComEd, PECO and Generation regarding a presentation by Robert S. Shapard, Executive Vice President and CFO. The exhibits include the slides and handouts used during the presentation. June 13, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon regarding the dismissal of a class action lawsuit. June 18, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon announcing an agreement to sell certain businesses of its subsidiary InfraSource, Inc. June 18, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon, ComEd, PECO and Generation regarding the sale of certain businesses of InfraSource, Inc. June 25, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon, ComEd, and Generation regarding the exercise of Generation's call option under an existing purchase power agreement with Midwest Generation, LLC. - ------------------------------------------------------------------------------------------------------------
10 SIGNATURES - -------------------------------------------------------------------------------- Pursuant to requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. EXELON CORPORATION /s/ John W. Rowe /s/ Robert S. Shapard ---------------------------- ----------------------------- JOHN W. ROWE ROBERT S. SHAPARD Chairman and Executive Vice President and Chief Executive Officer Chief Financial Officer (Principal Executive Officer) (Principal Financial Officer) /s/ Matthew F. Hilzinger --------------------------------------- MATTHEW F. HILZINGER Vice President and Corporate Controller (Principal Accounting Officer) December 15, 2003 - -------------------------------------------------------------------------------- Pursuant to requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. COMMONWEALTH EDISON COMPANY /s/ Michael B. Bemis /s/ J. Barry Mitchell --------------------------------- ------------------------------- MICHAEL B. BEMIS J. BARRY MITCHELL President, Exelon Energy Delivery Chief Financial Officer (Principal Executive Officer) (Principal Financial Officer) /s/ Duane M. DesParte /s/ Frank M. Clark ------------------------------ -------------------------------- DUANE M. DESPARTE FRANK M. CLARK Vice President and Controller, President, ComEd Exelon Energy Delivery (Principal Accounting Officer) December 15, 2003 11 - -------------------------------------------------------------------------------- Pursuant to requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. PECO ENERGY COMPANY /s/ Michael B. Bemis /s/ J. Barry Mitchell --------------------------------- ------------------------------- MICHAEL B. BEMIS J. BARRY MITCHELL President, Exelon Energy Delivery Chief Financial Officer (Principal Executive Officer) (Principal Financial Officer) /s/ Duane M. DesParte /s/ Denis P. O'Brien ------------------------------ -------------------- DUANE M. DESPARTE DENIS P. O'BRIEN Vice President and Controller, President, PECO Exelon Energy Delivery (Principal Accounting Officer) December 15, 2003 - -------------------------------------------------------------------------------- Pursuant to requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. EXELON GENERATION COMPANY, LLC /s/ Oliver D. Kingsley Jr. /s/ J. Barry Mitchell ---------------------------- ------------------------------- OLIVER D. KINGSLEY JR. J. BARRY MITCHELL Chief Executive Officer and Chief Financial Officer President (Principal Financial Officer) (Principal Executive Officer) /s/ Matthew F. Hilzinger ----------------------------------------------- MATTHEW F. HILZINGER Vice President and Corporate Controller, Exelon (Principal Accounting Officer) December 15, 2003 12
Exhibit 31-1

    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES
                            AND EXCHANGE ACT OF 1934

     I, John W. Rowe, certify that:

1.   I have reviewed this quarterly report on Form 10-Q/A of Exelon Corporation;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material  fact or omit to state a  material  fact  necessary  to make the
     statements made, in light of the circumstances  under which such statements
     were made,  not  misleading  with  respect  to the  period  covered by this
     report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  Evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluation; and

(c)  Disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the registrant's most recent
     fiscal quarter that has materially affected, or is reasonably likely to
     materially affect, the registrant's internal control over financial
     reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent functions):

(a)  All  significant  deficiencies  and  material  weaknesses  in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely  affect the  registrant's  ability to record,  process,
     summarize and report financial information; and

(b)  Any fraud,  whether or not  material,  that  involves  management  or other
     employees who have a significant role in the registrant's  internal control
     over financial reporting.

     Date:        December 15, 2003         /s/ John W. Rowe
                                            ------------------------------------
                                            Chairman and Chief Executive Officer
                                            (Principal Executive Officer)

Exhibit 31-2

    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES
                            AND EXCHANGE ACT OF 1934

     I, Robert S. Shapard, certify that:

1.   I have reviewed this quarterly report on Form 10-Q/A of Exelon Corporation;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material fact or omit to state a material fact necessary to make the
     statements made, in light of the circumstances under which such statements
     were made, not misleading with respect to the period covered by this
     report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  Evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluation; and

(c)  Disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the registrant's most recent
     fiscal quarter that has materially affected, or is reasonably likely to
     materially affect, the registrant's internal control over financial
     reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent functions):

(a)  All  significant  deficiencies  and  material  weaknesses  in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely  affect the  registrant's  ability to record,  process,
     summarize and report financial information; and

(b)  Any fraud,  whether or not  material,  that  involves  management  or other
     employees who have a significant role in the registrant's  internal control
     over financial reporting.


     Date:         December 15, 2003               /s/ Robert S. Shapard
                                                   ----------------------------
                                                   Executive Vice President and
                                                   Chief Financial Officer
                                                   (Principal Financial Officer)



Exhibit 31-3

    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES
                            AND EXCHANGE ACT OF 1934

     I, Michael B. Bemis, certify that:

1.   I have reviewed this quarterly report on Form 10-Q/A of Commonwealth Edison
     Company;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material  fact or omit to state a  material  fact  necessary  to make the
     statements made, in light of the circumstances  under which such statements
     were made,  not  misleading  with  respect  to the  period  covered by this
     report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  Evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluation; and

(c)  Disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the registrant's most recent
     fiscal quarter that has materially affected, or is reasonably likely to
     materially affect, the registrant's internal control over financial
     reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent functions):

(a)  All  significant  deficiencies  and  material  weaknesses  in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely  affect the  registrant's  ability to record,  process,
     summarize and report financial information; and

(b)  Any fraud,  whether or not  material,  that  involves  management  or other
     employees who have a significant role in the registrant's  internal control
     over financial reporting.

     Date:         December 15, 2003          /s/ Michael B. Bemis
                                              ----------------------------------
                                              President, Exelon Energy Delivery
                                              (Principal Executive Officer)



Exhibit 31-4

    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES
                            AND EXCHANGE ACT OF 1934

     I, J. Barry Mitchell, certify that:

1.   I have reviewed this quarterly report on Form 10-Q/A of Commonwealth Edison
     Company;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material  fact or omit to state a  material  fact  necessary  to make the
     statements made, in light of the circumstances  under which such statements
     were made,  not  misleading  with  respect  to the  period  covered by this
     report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  Evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluation; and

(c)  Disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the registrant's most recent
     fiscal quarter that has materially affected, or is reasonably likely to
     materially affect, the registrant's internal control over financial
     reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent functions):

(a)  All  significant  deficiencies  and  material  weaknesses  in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely  affect the  registrant's  ability to record,  process,
     summarize and report financial information; and

(b)  Any fraud,  whether or not  material,  that  involves  management  or other
     employees who have a significant role in the registrant's  internal control
     over financial reporting.

     Date:    December 15, 2003             /s/ J. Barry Mitchell
                                            ----------------------------
                                            Chief Financial Officer
                                            (Principal Financial Officer)





Exhibit 31-5

    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES
                            AND EXCHANGE ACT OF 1934

     I, Michael B. Bemis, certify that:

1.   I have reviewed this quarterly report on Form 10-Q/A of PECO Energy
     Company;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material fact or omit to state a material fact necessary to make the
     statements made, in light of the circumstances under which such statements
     were made, not misleading with respect to the period covered by this
     report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  Evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluation; and

(c)  Disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the registrant's most recent
     fiscal quarter that has materially affected, or is reasonably likely to
     materially affect, the registrant's internal control over financial
     reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent functions):

(a)  All  significant  deficiencies  and  material  weaknesses  in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely  affect the  registrant's  ability to record,  process,
     summarize and report financial information; and

(b)  Any fraud,  whether or not  material,  that  involves  management  or other
     employees who have a significant role in the registrant's  internal control
     over financial reporting.

     Date:         December 15, 2003           /s/ Michael B. Bemis
                                               ---------------------------------
                                               President, Exelon Energy Delivery
                                               (Principal Executive Officer)


Exhibit 31-6

    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES
                            AND EXCHANGE ACT OF 1934

     I, J. Barry Mitchell, certify that:

1.   I have reviewed this quarterly report on Form 10-Q/A of PECO Energy
     Company;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material fact or omit to state a material fact necessary to make the
     statements made, in light of the circumstances under which such statements
     were made, not misleading with respect to the period covered by this
     report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  Evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluation; and

(c)  Disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the registrant's most recent
     fiscal quarter that has materially affected, or is reasonably likely to
     materially affect, the registrant's internal control over financial
     reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent functions):

(a)  All  significant  deficiencies  and  material  weaknesses  in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely  affect the  registrant's  ability to record,  process,
     summarize and report financial information; and

(b)  Any fraud,  whether or not  material,  that  involves  management  or other
     employees who have a significant role in the registrant's  internal control
     over financial reporting.


      Date:    December 15, 2003             /s/ J. Barry Mitchell
                                            ----------------------------
                                            Chief Financial Officer
                                            (Principal Financial Officer)




Exhibit 31-7

          CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE
                       SECURITIES AND EXCHANGE ACT OF 1934

     I, Oliver D. Kingsley Jr., certify that:

1.   I have reviewed this quarterly  report on Form 10-Q/A of Exelon  Generation
     Company, LLC;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material  fact or omit to state a  material  fact  necessary  to make the
     statements made, in light of the circumstances  under which such statements
     were made,  not  misleading  with  respect  to the  period  covered by this
     report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  Evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluation; and

(c)  Disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the registrant's most recent
     fiscal quarter that has materially affected, or is reasonably likely to
     materially affect, the registrant's internal control over financial
     reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent functions):

(a)  All  significant  deficiencies  and  material  weaknesses  in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely  affect the  registrant's  ability to record,  process,
     summarize and report financial information; and

(b)  Any fraud,  whether or not  material,  that  involves  management  or other
     employees who have a significant role in the registrant's  internal control
     over financial reporting.

     Date:   December 15, 2003             /s/ Oliver D. Kingsley Jr.
                                           -------------------------------------
                                           Chief Executive Officer and President
                                          (Principal Executive Officer)


Exhibit 31-8

    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES
                            AND EXCHANGE ACT OF 1934

     I, J. Barry Mitchell, certify that:

1.   I have reviewed this quarterly  report on Form 10-Q/A of Exelon  Generation
     Company, LLC;

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material  fact or omit to state a  material  fact  necessary  to make the
     statements made, in light of the circumstances  under which such statements
     were made,  not  misleading  with  respect  to the  period  covered by this
     report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)  Designed such disclosure controls and procedures, or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the registrant, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  Evaluated the effectiveness of the registrant's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluation; and

(c)  Disclosed in this report any change in the registrant's internal control
     over financial reporting that occurred during the registrant's most recent
     fiscal quarter that has materially affected, or is reasonably likely to
     materially affect, the registrant's internal control over financial
     reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation of internal control over financial reporting, to
     the registrant's auditors and the audit committee of the registrant's board
     of directors (or persons performing the equivalent functions):

(a)  All  significant  deficiencies  and  material  weaknesses  in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely  affect the  registrant's  ability to record,  process,
     summarize and report financial information; and

(b)  Any fraud,  whether or not  material,  that  involves  management  or other
     employees who have a significant role in the registrant's  internal control
     over financial reporting.


 Date:    December 15, 2003                 /s/ J. Barry Mitchell
                                            ----------------------------
                                            Chief Financial Officer
                                            (Principal Financial Officer)