Exhibit 99.1

May 24, 2011

Eagle Rock Prices Private Offering of $300 Million of 83/8% Senior Notes

HOUSTON - Eagle Rock Energy Partners, L.P. (“Eagle Rock” or the “Partnership”) (NASDAQ: EROC) announced today that it priced its private offering of $300 million in aggregate principal amount of 83/8% senior unsecured notes due 2019 (the “Notes”) to yield 8.50% to maturity.

The Partnership intends to use the net proceeds from the Notes offering of approximately $289.2 million to repay indebtedness under its existing revolving credit facility.  The offering is expected to close on May 27, 2011, subject to the satisfaction of customary closing conditions.

The Notes have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or any state securities laws, and unless so registered, the Notes may not be offered or sold in the United States except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws.  The Notes are expected to be eligible for trading by qualified institutional buyers under Rule 144A and non-US persons under Regulation S.  This announcement is being issued pursuant to Rule 135c under the Securities Act and shall not constitute an offer to sell or the solicitation of an offer to buy the Notes.

Contacts:

Eagle Rock Energy Partners, L.P.

Jeff Wood, 281-408-1203

Senior Vice President and Chief Financial Officer

Adam Altsuler, 281-408-1350

Director, Corporate Finance and Investor Relations

This news release may include “forward-looking statements.”  All statements, other than statements of historical facts, included in this press release that address activities, events or developments that the Partnership expects, believes or anticipates will or may occur in the future are forward-looking statements and speak only as of the date on which such statement is made. These statements are based on certain assumptions made by the Partnership based on its experience and perception of historical trends, current conditions, expected future developments and other factors it believes are

1

appropriate under the circumstances. Such statements are subject to a number of assumptions, risks and uncertainties, many of which are beyond the control of the Partnership. These include risks related to volatility of commodity prices; market demand for natural gas and natural gas liquids; the effectiveness of the Partnership’s hedging activities; the Partnership’s ability to retain key customers; the Partnership’s ability to continue to obtain new sources of natural gas supply; the availability of local, intrastate and interstate transportation systems and other facilities to transport natural gas and natural gas liquids; competition in the oil and gas industry; the Partnership’s ability to obtain credit and access the capital markets; general economic conditions; and the effects of government regulations and policies.  Should one or more of these risks or uncertainties occur, or should underlying assumptions prove incorrect, the Partnership’s actual results and plans could differ materially from those implied or expressed by any forward-looking statements. The Partnership assumes no obligation to update any forward-looking statement as of any future date.  For a detailed list of the Partnership’s risk factors, please consult the Partnership’s Form 10-K, filed with the Securities and Exchange Commission (“SEC”) for the year ended December 31, 2010 and the Partnership’s Forms 10-Q filed with the SEC for subsequent quarters, as well as any other public filings and press releases.

###

2