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 September 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 September 30, 2003 was: Exelon Corporation Common Stock, without par value 327,021,190 Commonwealth Edison Company Common Stock, $12.50 par value 127,016,483 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 7 ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K 7 SIGNATURES 10 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). This amendment makes changes to Part I, Item 4. Controls and Procedures 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 October 29, 2003, the filing date of our original Quarterly Report on Form 10-Q for the quarter ended September 30, 2003. 3 PART I. FINANCIAL INFORMATION ITEM 4. CONTROLS AND PROCEDURES Exelon During the third 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 September 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. ComEd During the third 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, 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 4 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 September 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. PECO During the third 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. Accordingly, as of September 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. Generation During the third 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 5 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 September 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 PART II. OTHER INFORMATION ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K (a) Exhibits: 10-1 - Retirement and Separation between Exelon Corporation, PECO Energy Company and Kenneth G. Lawrence, dated as of May 11, 2003. Filed on behalf of PECO.* 10-2 - Purchase and Sale Agreement dated as of October 10, 2003 between British Energy Investment Ltd. and Exelon Generation Company, LLC relating to the sale and purchase of 100% of the shares of British Energy US Holdings Inc. Filed on behalf of Exelon and Generation.* --------------------------------------------------------------------------- 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 September 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 September 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 September 30, 2003 filed on October 29, 2003 (File No. 1-16169, September 30, 2003 Form 10-Q, Exhibits 10-1 through 32-8). 7 (b) Reports on Form 8-K: Exelon, ComEd, PECO and/or Generation filed Current Reports on Form 8-K during the three months ended September 30, 2003 regarding the following items:
Date of Earliest Event Reported Description of Item Reported - ------------------------------------------------------------------------------------------------------------ July 3, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and Generation regarding the fact that EBG did not anticipate that the construction of the Mystic 8 and 9 and Fore River generating stations would achieve Project Completion as defined in EBG's credit facility by July 11, 2003. July 29, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and Generation announcing that Exelon commenced the process of an orderly transition out of the ownership of EBG and the projects. August 6, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon, ComEd, PECO and Generation reaffirming Exelon's 2003 earnings guidance and announcing workforce reductions related to The Exelon Way. August 13, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and Generation regarding a note to Exelon's financial community announcing an agreement with entities controlled by Reservoir to sell 50% of Sithe, after closing on a call transaction announced in May 2003. In a separate transaction, Sithe has entered into an agreement with Resevoir to sell entities holding six U.S. generating facilities and an entity holding Sithe's Canadian assets. August 25, 2003 "ITEM 5. OTHER EVENTS" filed for ComEd regarding ComEd's sale of $250 million of First Mortgage Bonds. "ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS" including exhibits to ComEd's Form S-3, Registration No. 333-99363. August 29, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and Generation regarding the fact that the period during which the lenders were precluded from exercising any remedies resulting from the failure of the EBG projects to achieve Project Completion had expired. Exelon was continuing discussions with the lenders regarding the orderly transition of the projects. Exelon has informed the lenders that Generation will not provide additional funding to the projects beyond its existing contractual obligations. September 12, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and ComEd regarding a filing with the Federal Energy Regulatory Commission 8 to seek an adjustment in transmission rates. The exhibit includes the press release announcing the filing. September 24, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon announcing that it had finalized the sale of InfraSource, Inc. September 26, 2003 "ITEM 5. OTHER EVENTS" filed for Exelon and ComEd announcing that Exelon is exploring the possibility of acquiring Illinois Power Company from Dynegy Inc. - ------------------------------------------------------------------------------------------------------------
9 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 Chief Executive Officer 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 10 - -------------------------------------------------------------------------------- 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 11
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)