Exhibit 23.3





                        CONSENT OF OIL AND GAS CONSULTANT


As  independent  petroleum  consultants to The Houston  Exploration  Company and
KeySpan Exploration and Production,  LLC, Miller and Lents, Ltd. hereby consents
to the  incorporation  of our  report  included  in this  Form  10-K of  KeySpan
Corporation and into the KeySpan  Corporation's  previously  filed  Registration
Statements File Nos.  333-53657,  333-53765,  333-92003,  333-79151,  333-40472,
333-43768, 333-60294, 333-82230, and 333-104230.


                                                   MILLER AND LENTS, LTD.



                                                   By  /s/
                                                       -------------------------
                                                       Christopher A. Butta
                                                       Senior Vice President


March 10, 2004
Houston, Texas