Exhibit 99.1

For Information

James R. Edwards

303-861-8140

FOR IMMEDIATE RELEASE

SM ENERGY PRICES $500 MILLION PRIVATE OFFERING

OF SENIOR NOTES DUE 2024

DENVER, CO — May 15, 2013 — SM Energy Company (NYSE: SM) today announces that it has priced a private offering of $500 million of 5% senior unsecured notes due 2024.  The company increased the size of the offering from the previously announced $400 million to $500 million.  These senior notes will be issued at par.  The offering is expected to close on May 20, 2013, subject to customary closing conditions.  The company intends to use the net proceeds from the offering to repay outstanding borrowings under its credit facility and for general corporate purposes.

The notes have not been registered under the Securities Act of 1933 (the “Securities Act”) or applicable state securities laws and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state securities laws.  The notes may be resold by the initial purchasers pursuant to Rule 144A and Regulation S under the Securities Act.

This press release is being issued pursuant to Rule 135c under the Securities Act, and is neither an offer to sell any of these securities, nor a solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

ABOUT THE COMPANY

SM Energy Company is an independent energy company engaged in the acquisition, exploration, development, and production of crude oil, natural gas, and natural gas liquids in onshore North America. SM Energy routinely posts important information about the company on its website. For more information about SM Energy, please visit its website at www.sm-energy.com.

INFORMATION ON FORWARD LOOKING STATEMENTS

This release contains forward looking statements within the meaning of securities laws, including forecasts and projections.  The words “anticipate,” “assume,” “believe,” “budget,” “estimate,” “expect,” “forecast,” “intend,” “plan,” “project,” “will” and similar expressions are intended to identify forward looking statements.  These statements involve known and unknown risks, which may cause SM Energy’s actual results to differ materially from results expressed or implied by the forward looking statements.  These risks include factors such as the availability, proximity and capacity of gathering, processing and transportation facilities; the uncertainty of negotiations to result in an agreement or a completed transaction; the uncertain nature of announced acquisition, divestiture, joint venture, farm down or similar efforts and the ability to complete any such transactions; the uncertain nature of expected benefits from the actual or expected acquisition, divestiture, joint venture, farm down or similar efforts; the volatility and level of oil, natural gas, and natural gas liquids prices; uncertainties inherent in projecting future rates of production from drilling activities and acquisitions; the imprecise nature of estimating oil and gas reserves; the availability of additional economically attractive exploration, development, and acquisition opportunities for future growth and any necessary financings; unexpected drilling conditions and results; unsuccessful exploration and development drilling results; the availability of drilling, completion, and operating equipment and services; the risks associated with the Company’s commodity price risk management strategy; uncertainty regarding the ultimate impact of potentially dilutive

securities; and other such matters discussed in the “Risk Factors” section of SM Energy’s 2012 Annual Report on Form 10-K. The forward looking statements contained herein speak as of the date of this announcement. Although SM Energy may from time to time voluntarily update its prior forward looking statements, it disclaims any commitment to do so except as required by securities laws.