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10-K - 10-K - MARKWEST ENERGY PARTNERS L Pa2196773z10-k.htm
EX-31.2 - EX-31.2 - MARKWEST ENERGY PARTNERS L Pa2196773zex-31_2.htm
EX-31.1 - EX-31.1 - MARKWEST ENERGY PARTNERS L Pa2196773zex-31_1.htm
EX-12.1 - EX-12.1 - MARKWEST ENERGY PARTNERS L Pa2196773zex-12_1.htm
EX-21.1 - EX-21.1 - MARKWEST ENERGY PARTNERS L Pa2196773zex-21_1.htm
EX-32.1 - EX-32.1 - MARKWEST ENERGY PARTNERS L Pa2196773zex-32_1.htm
EX-32.2 - EX-32.2 - MARKWEST ENERGY PARTNERS L Pa2196773zex-32_2.htm
EX-10.40 - EX-10.40 - MARKWEST ENERGY PARTNERS L Pa2196773zex-10_40.htm
EX-10.41 - EX-10.41 - MARKWEST ENERGY PARTNERS L Pa2196773zex-10_41.htm
EX-10.39 - EX-10.39 - MARKWEST ENERGY PARTNERS L Pa2196773zex-10_39.htm

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Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We consent to the incorporation by reference in Registration Statement Nos. 333-142358, 333-149742, 333-157883 and 333-164323 on Form S-3 and Registration Statement Nos. 333-91120, 333-151159, 333-151162 and 333-151164 on Form S-8 of our reports dated March 1, 2010, relating to the consolidated financial statements of MarkWest Energy Partners, L.P. and subsidiaries (the "Partnership"), and the effectiveness of the Partnership's internal control over financial reporting, appearing in this Annual Report on Form 10-K of MarkWest Energy Partners, L.P. for the year ended December 31, 2009.

/s/ DELOITTE & TOUCHE LLP

Denver, Colorado
March 1, 2010




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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM