Exhibit 32.3
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
In connection with the Annual Report of MarkWest Energy Partners, L.P. (the “Partnership”) on Form 10-K for the period ending December 31, 2003, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Andrew L. Schroeder, Vice President, Treasurer and Secretary of the General Partner of the Partnership, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:
(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Partnership.
/s/ Andrew L. Schroeder |
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Andrew L. Schroeder | ||
Vice President, Treasurer and Secretary | ||
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March 15, 2004 | ||