Exhibit 99.1

CONSOL ENERGY INC.

1800 Washington Road

Pittsburgh, Pennsylvania 15241

Certification of Principal Executive Officer

Pursuant to 18 U.S.C. 1350

(Section 906 of the Sarbanes-Oxley Act of 2002)

I, J. Brett Harvey, President and Chief Executive Officer (principal executive officer) of CONSOL Energy Inc. (the “Registrant”), certifies that to my knowledge, based upon a review of the Annual Report on Form 10-K for the period ended December 31, 2002 of the Registrant (the “Report”):

(1)    The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

By:	/s/    J. BRETT HARVEY
Name:	J. Brett Harvey
Date:	March 21, 2003