Basin Pipeline S-4 Registration of securities issued in business combination transactions

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Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We hereby consent to the incorporation by reference in this Registration Statement on Form S-4 of MarkWest Energy Partners, L.P. of our report dated March 15, 2004 relating to the financial statements, which appears in MarkWest Energy Partners, L.P.'s 2003 Annual Report on Form 10-K for the year ended December 31, 2003. We also consent to the reference to us under the heading "Experts" in such Registration Statement.

PricewaterhouseCoopers LLP

Denver, CO
February 22, 2005

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Exhibit 23.1