DENVER--(BUSINESS WIRE)--May. 8, 2012--
MarkWest Energy Partners, L.P. (NYSE: MWE) announced today that it is
commencing a public offering of 8,000,000 common units. MarkWest intends
to grant the underwriters a 30-day option to purchase a maximum of
1,200,000 additional common units to cover the underwriters’ sale of
additional common units, if any. MarkWest intends to use the net
proceeds from the offering and from any exercise of the underwriters’
option to purchase additional common units to partially fund its
acquisition of Keystone Midstream Services, LLC, which owns certain gas
gathering and processing facilities located in Butler County,
Pennsylvania (the “Keystone Acquisition”). If MarkWest does not
consummate the Keystone Acquisition, it intends to use the net proceeds
from the offering and from any exercise of the underwriters’ option for
general partnership purposes, including, but not limited to, funding
capital expenditures and general working capital.
Morgan Stanley, BofA Merrill Lynch, Barclays, Citigroup, UBS Investment
Bank and Wells Fargo Securities are acting as joint book-running
managers for the offering. The 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
the offering may be obtained from the underwriters as follows:
Morgan Stanley
Attn: Prospectus Dept.
180 Varick Street, 2nd
Floor
New York, New York 10014
Telephone: (866) 718-1649
Email:
prospectus@morganstanley.com
BofA Merrill Lynch
4 World Financial Center
New York, NY 10080
Attn:
Prospectus Department
Email: dg.prospectus_requests@baml.com
Barclays
c/o Broadridge Financial Solutions
1155 Long Island
Ave.
Edgewood, New York 11717
Telephone: (888) 603-5847
Email:
barclaysprospectus@broadridge.com
Citigroup
Attn: Prospectus Dept.
Brooklyn Army Terminal
140
58th Street, 8th floor,
Brooklyn, NY, 11220
Telephone: (800)
831-9146
Email: batprospectusdept@citi.com
UBS Investment Bank
Attn: Prospectus Dept.
299 Park Avenue
New
York, New York 10171
Telephone: (888) 827-7275
Wells Fargo Securities
Attn: Equity Syndicate Dept.
375 Park
Ave.
New York, New York 10152
Telephone: (800) 326-5897
Email:
cmclientsupport@wellsfargo.com
An electronic copy of the preliminary prospectus supplement and the
accompanying base prospectus is available on the Securities and Exchange
Commission’s (SEC) web site at http://www.sec.gov.
The common units are being offered pursuant to an effective shelf
registration statement that MarkWest 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
securities 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,
including the possibility that the Keystone Acquisition will not be
consummated. 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 Report on Form 10-Q for the quarter ended March
31, 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.

Source: MarkWest Energy Partners, L.P.
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