EXHIBIT 31.1

Certification Pursuant to Rules13a-14 and 15d-14
of the 1934 Securities Exchange Act

I, Thomas M. OFlynn,
certify that:

1.

I
have reviewed this Quarterly Report on Form 10-Q of Public Service Enterprise
Group Incorporated;

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(s) 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 (the registrants
fourth fiscal quarter in the case of an annual report) 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(s) 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:  October 30, 2003 | /s/ Thomas
  M. OFlynn                        | 
|----------------------- | ---------------------------------------------- | 
|                        |                                                | 
|                        | Thomas M. OFlynn                             
|                        | Public
  Service Enterprise Group Incorporated
|                        | Chief
  Financial Officer