Eagle Rock Energy Partners L P (EROC) DEFA14A Additional proxy soliciting materials

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.     )
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EAGLE ROCK ENERGY PARTNERS, L.P.
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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Unitholder Meeting to Be Held on May 22, 2012. Meeting Information EAGLE ROCK ENERGY PARTNERS, L.P. Meeting Type: Annual Meeting For holders as of: March 26, 2012 Date: May 22, 2012 Time: 9:00 a.m. local time Location: Eagle Rock Energy Partners, L.P. 1415 Louisiana Street The Wedge Tower Suite 2700 Houston, TX 77002 You are receiving this communication because you hold common units in the above named partnership. This is not a ballot. You cannot use this notice to vote these common units. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. EAGLE ROCK ENERGY PARTNERS, L.P. 1415 LOUISIANA STREET SUITE 2700 HOUSTON, TX 77002 M44672-P22117 See the reverse side of this notice to obtain proxy materials and voting instructions.

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: 1. NOTICE AND PROXY STATEMENT 2. ANNUAL REPORT TO UNITHOLDERS How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents for this meeting and all future meetings, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line. . XXXX XXXX XXXX . XXXX XXXX XXXX Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 10, 2012 to facilitate timely delivery. M44673-P22117 How To Vote Please Choose One of the Following Voting Methods Vote In Person: Many meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these units. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. . XXXX XXXX XXXX

Voting Items The Board of Directors recommends you vote FOR the following: 1. Election of Class II Directors Nominees: 01) William A. Smith 02) Herbert C. Williamson, III The Board of Directors recommends you vote FOR the following proposals: 2. Advisory vote to approve named executive officer compensation. 3. Ratification of the appointment of KPMG LLP as the independent registered public accounting firm of the Partnership to examine, audit and report to unitholders on the consolidated financial statements of the Partnership and its subsidiaries for the fiscal year ending December 31, 2012. NOTE: In their discretion, the Proxies are authorized to vote upon such other business as may properly come before the meeting or any adjournment or postponement thereof. M44674-P22117