MarkWest Energy Partners Closes Public Offering of $1.0 Billion of 4.5% Senior Notes Due 2023

  MarkWest Energy Partners Closes Public Offering of $1.0 Billion of 4.5%
  Senior Notes Due 2023

Business Wire

DENVER -- January 10, 2013

MarkWest Energy Partners, L.P. (NYSE: MWE) (the “Partnership”) and its
subsidiary MarkWest Energy Finance Corporation today announced the closing of
a public offering of $1,000,000,000 of 4.5% senior unsecured notes due 2023
(the “Notes”) priced at par.

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 acted as joint
book-running managers for the Notes offering. 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, or
    Toll-Free: (888) 603-5847;
  *BofA Merrill Lynch, Attention: Prospectus Department, 222 Broadway, New
    York, NY 10038. By email at;
  *Citigroup, c/o Broadridge Financial Solutions, 1155 Long Island Ave.
    Edgewood, NY 11717. By email at, or Toll-Free:
    (800) 831-9146;
  *Goldman, Sachs & Co., Attention: Prospectus Department, 200 West Street,
    New York, NY 10282. By email at, 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, 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, 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, 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, or Toll-Free: (800) 326-5897.

An electronic copy of the prospectus supplement and the accompanying base
prospectus is available from the Securities and Exchange Commission’s (SEC)
web site at The Notes were 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.


MarkWest Energy Partners, L.P.
Frank Semple, 866-858-0482
Chairman, President & CEO
Nancy Buese, 866-858-0482
Senior VP & CFO
Josh Hallenbeck, 866-858-0482
VP of Finance & Treasurer
Press spacebar to pause and continue. Press esc to stop.