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MarkWest Energy Partners Announces Public Offering of $1.0 Billion of Senior Notes Due 2023

  MarkWest Energy Partners Announces Public Offering of $1.0 Billion of Senior
  Notes Due 2023

Business Wire

DENVER -- January 7, 2013

MarkWest Energy Partners, L.P. (NYSE: MWE) (the “Partnership”) and its
subsidiary MarkWest Energy Finance Corporation announced today that, subject
to market conditions, they intend to commence a public offering of
$1,000,000,000 in aggregate principal amount of senior unsecured notes due
2023 (the “Notes”).

The Partnership intends to use a portion of the net proceeds from the Notes
offering, together with cash on hand resulting in part from its recent equity
offerings, to fund the redemption of all of its outstanding 8.75% Senior Notes
due 2018, and a portion of its 6.5% Senior Notes due 2021 and 6.25% Senior
Notes due 2022, with the balance of such proceeds to be used to fund the
Partnership’s capital expenditure program, for general working capital and for
other general partnership purposes. Any redemption of these series of senior
notes will be made by separate notice to holders of such senior notes and
nothing in this press release is intended to constitute such notice.

Barclays, BofA Merrill Lynch, Citigroup, Goldman, Sachs & Co., J.P. Morgan,
Morgan Stanley, Natixis, RBC Capital Markets, SunTrust Robinson Humphrey, UBS
Investment Bank, US Bancorp, and Wells Fargo Securities are acting as joint
book-running managers for the Notes offering. The Notes offering is being made
only by means of a prospectus supplement and accompanying base prospectus. A
copy of the prospectus supplement and accompanying base prospectus associated
with this offering may be obtained from the underwriters as follows:

  *Barclays, c/o Broadridge Financial Solutions, 1155 Long Island Ave.
    Edgewood, NY 11717. By email at barclaysprospectus@broadridge.com, or
    Toll-Free: (888) 603-5847;
  *BofA Merrill Lynch, Attention: Prospectus Department, 222 Broadway, New
    York, NY 10038. By email at dg.prospectus_requests@baml.com;
  *Citigroup, c/o Broadridge Financial Solutions, 1155 Long Island Ave.
    Edgewood, NY 11717. By email at batprospectusdept@citi.com, or Toll-Free:
    (800) 831-9146;
  *Goldman, Sachs & Co., Attention: Prospectus Department, 200 West Street,
    New York, NY 10282. By email at prospectus-ny@ny.email.gs.com, or
    Toll-Free: (866) 471-2526;
  *J.P. Morgan, c/o Broadridge Financial Solutions, 1155 Long Island Ave.
    Edgewood, NY 11717. Toll-Free: (866) 803-9204;
  *Morgan Stanley, Attention: Prospectus Department, 180 Varick Street, 2nd
    Floor, New York, NY 10014. By email at prospectus@morganstanley.com, or
    Toll-Free: (866) 718-1649;

  *Natixis, Attention: Natixis Securities Americas LLC Fixed Income
    Syndicate, 1251 Avenue of the Americas (4th floor), New York, NY 10020.
    Toll-Free: (866) 245-0436;
  *RBC Capital Markets, Three World Financial Center, 200 Vesey Street, 10th
    Floor, New York, NY 10281-8098. By email at CM-USA-Prospectus@rbc.com, or
    Toll-Free: (877) 280-1299;
  *SunTrust Robinson Humphrey, Attention: High Yield Syndicate, 333 Peachtree
    Road, 10th Floor, Atlanta, GA 30326. By phone: (404) 926-5052;
  *UBS Investment Bank, Attention: Prospectus Dept., 299 Park Avenue, New
    York, NY 10171. Toll-Free: (877) 827-6444, ext. 561 3884;
  *US Bancorp, Attention: Stephen Philipson – High Yield Syndicate, 214 North
    Tryon Street, Charlotte, NC 28202. By email at
    stephen.philipson@usbank.com, or Toll-Free: (877) 558-2607; or
  *Wells Fargo Securities, LLC, 550 South Tryon Street, 7th Floor MAC
    D1086-070, Charlotte, NC 28202. By email at
    cmclientsupport@wellsfargo.com, or Toll-Free: (800) 326-5897.

An electronic copy of the preliminary prospectus supplement and the
accompanying base prospectus is available from the Securities and Exchange
Commission’s (SEC) web site at http://www.sec.gov. The Notes are being offered
pursuant to an effective shelf registration statement that the Partnership
previously filed with the SEC. This press release shall not constitute an
offer to sell or the solicitation of an offer to buy nor shall there be any
sale of these Notes in any state in which such offer, solicitation, or sale
would be unlawful prior to registration or qualification under the securities
laws of such state.

MarkWest Energy Partners, L.P. is a master limited partnership engaged in the
gathering, transportation, and processing of natural gas; the transportation,
fractionation, marketing, and storage of natural gas liquids; and the
gathering and transportation of crude oil. MarkWest has extensive natural gas
gathering, processing, and transmission operations in the southwest, Gulf
Coast, and northeast regions of the United States, including the Marcellus
Shale, and is the largest natural gas processor and fractionator in the
Appalachian region.

This press release includes “forward-looking statements.” All statements other
than statements of historical facts included or incorporated herein may
constitute forward-looking statements. Actual results could vary significantly
from those expressed or implied in such statements and are subject to a number
of risks and uncertainties. Although MarkWest believes that the expectations
reflected in the forward-looking statements are reasonable, MarkWest can give
no assurance that such expectations will prove to be correct. The
forward-looking statements involve risks and uncertainties that affect
operations, financial performance, and other factors as discussed in filings
with the Securities and Exchange Commission. Among the factors that could
cause results to differ materially are those risks discussed in the periodic
reports filed with the SEC, including MarkWest’s Annual Report on Form 10-K
for the year ended December 31, 2011 and its Quarterly Reports on Form 10-Q
for the quarters ended March 31, 2012, June 30, 2012 and September 30, 2012.
You are urged to carefully review and consider the cautionary statements and
other disclosures made in those filings, specifically those under the heading
“Risk Factors.” MarkWest does not undertake any duty to update any
forward-looking statement except as required by law.

Contact:

MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
or
Nancy Buese, 866-858-0482
Senior VP & CFO
or
Josh Hallenbeck, 866-858-0482
VP of Finance & Treasurer
investorrelations@markwest.com