UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): May 28, 2015

MARKWEST ENERGY PARTNERS, L.P.

(Exact name of registrant as specified in its charter)

Delaware

(State or other jurisdiction of

incorporation or organization)

001-31239

(Commission File Number)

27-0005456

(I.R.S. Employer

Identification Number)

1515 Arapahoe Street, Tower 1, Suite 1600, Denver CO 80202

(Address of principal executive offices)

Registrant’s telephone number, including area code: 303-925-9200

Not Applicable.

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o Written Communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-Commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-Commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

ITEM 7.01. Regulation FD Disclosure.

In accordance with General Instruction B.2 of Form 8-K, the following information in this Current Report on Form 8-K (including the exhibit) is furnished pursuant to Item 7.01 and shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section. This Current Report will not be deemed an admission as to the materiality of any information in the report that is required to be disclosed solely by Regulation FD.

On May 28, 2015, MarkWest Energy Partners, L.P. (the “Partnership”) issued a press release announcing the commencement of three concurrent cash tender offers (the “Offers”) to purchase any and all of the outstanding $500,000,000 aggregate principal amount of its 6.75% senior notes due 2020, $325,000,000 aggregate principal amount of its 6.5% senior notes due 2021 and $455,000,000 aggregate principal amount of its 6.25% senior notes due 2022. The terms and conditions of the Offers are described in the Offer to Purchase dated May 28, 2015, and the Letter of Transmittal and Notice of Guaranteed Delivery relating thereto. A copy of the press release is furnished as Exhibit 99.1 hereto.

ITEM 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.		Description of Exhibit
99.1		Press release dated May 28, 2015, announcing the commencement of the Offers.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	MARKWEST ENERGY PARTNERS, L.P.
	(Registrant)


	By:	MarkWest Energy GP, L.L.C.,
		Its General Partner

Date: May 28, 2015	By:	/s/ NANCY K. BUESE
		Nancy K. Buese
		Executive Vice President and Chief Financial Officer