Filed pursuant to Rule 424(b)(3)
                                            Registration Statement No. 333-23659



LOGO
                                                  PEI
                                                  Pennsylvania Enterprises, Inc.


                                          This letter amends and supplements the
                                          prospectus   dated  April  23,   1999,
                                          relating    to    the     Pennsylvania
                                          Enterprises,   Inc.  (the   "Company")
                                          Customer   Stock  Purchase  Plan  (the
                                          "Plan")


                                          June 10, 1999



Dear Customer:

            Thank you for your past participation in the Customer Stock Purchase
Plan of Pennsylvania Enterprises, Inc. Our Board of Directors recently announced
its approval of a definitive  merger  agreement with Southern Union Company,  an
international energy company headquartered in Austin, Texas. As a result of this
planned merger,  and after carefully  considering this matter, we have concluded
to  suspend  the  Plan  effective  June 7,  1999.  Therefore,  we are no  longer
accepting investments in the Plan.

            If  circumstances  change and if the Company  determines  that it is
desirable  to  reinstate  the  Plan,   the  Company  will  notify  the  eligible
participants  accordingly.  Once again, thank you for your past participation in
the Customer Stock Purchase Plan.

                                          Very truly yours,

                                          /s/ Thomas F. Karam

                                          Thomas F. Karam
                                          President and Chief Executive Officer

ONE PEI CENTER
WILKES-BARRE, PA  18711-1801