CNX Resources (CNX) 10-K 2004 FY Annual report

Exhibit 32.1

CERTIFICATIONS

I, J. Brett Harvey, President and Chief Executive Officer (principal executive officer) of CONSOL Energy Inc. (the “Registrant”), certify that to my knowledge, based upon a review of the Annual Report on Form 10-K for the period ended December 31, 2004, of the Registrant (the “Report”):

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

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

Date: February 28, 2005

/s/    J. BRETT HARVEY

J. Brett Harvey

President, Chief Executive Officer and Director