Exhibit 99.1

Pacific Ethanol, Inc. ANNOUNCES

PROPOSED OFFERING OF COMMON STOCK AND WARRANTS

Sacramento, CA, September 20, 2012– Pacific Ethanol, Inc. (NASDAQ: PEIX), the leading marketer and producer of low-carbon renewable fuels in the Western United States, announced that it intends to offer units consisting of shares of common stock and warrants in an underwritten public offering. The company also expects to grant the underwriter a 30-day option to purchase additional units of common stock to cover over-allotments, if any. Lazard Capital Markets LLC is acting as the sole book-running manager for the offering. While the offering is expected to price before 9:30 am EDT on September 21, 2012, the offering is subject to market conditions, and there can be no assurance as to whether or when the offering may be completed, or as to the actual size or terms of the offering.

A registration statement relating to the units issued in the offering has been filed with, and declared effective by Securities and Exchange Commission (the “SEC”). A preliminary prospectus supplement, as well as a final prospectus supplement, relating to the offering will be filed with the SEC, each of which will form a part of the effective registration statement. When available, copies of the preliminary and final prospectus supplements relating to these securities may be obtained by visiting the SEC’s website at www.sec.gov or from Lazard Capital Markets LLC, 30 Rockefeller Plaza, 60th Floor, New York, NY 10020 or via telephone at (800) 542-0970.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of any securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction.

About Pacific Ethanol, Inc.

Pacific Ethanol, Inc. (NASDAQ: PEIX) is the leading marketer and producer of low-carbon renewable fuels in the Western United States. Pacific Ethanol also sells co-products, including wet distillers grain (WDG), a nutritional animal feed. Serving integrated oil companies and gasoline marketers who blend ethanol into gasoline, Pacific Ethanol provides transportation, storage and delivery of ethanol through third-party service providers in the Western United States, primarily in California, Arizona, Nevada, Utah, Oregon, Colorado, Idaho and Washington. Pacific Ethanol has a 67% ownership interest in New PE Holdco LLC, the owner of four ethanol production facilities. Pacific Ethanol operates and manages the four ethanol production facilities, which have a combined annual production capacity of 200 million gallons. The facilities in operation are located in Boardman, Oregon, Burley, Idaho and Stockton, California, and one idled facility is located in Madera, California. The facilities are near their respective fuel and feed customers, offering significant timing, transportation cost and logistical advantages. Pacific Ethanol’s subsidiary, Kinergy Marketing LLC, markets ethanol from Pacific Ethanol’s managed plants and from other third-party production facilities, and another subsidiary, Pacific Ag. Products, LLC, markets WDG. For more information please visit www.pacificethanol.net.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995

With the exception of historical information, the matters discussed in this press release including, without limitation, the ability of Pacific Ethanol to continue as the leading marketer and producer of low-carbon renewable fuels in the Western United States; and the success, timing and nature of the proposed offering are forward-looking statements and considerations that involve a number of risks and uncertainties. The actual future results of Pacific Ethanol could differ from those statements. Factors that could cause or contribute to such differences include, but are not limited to, adverse economic and market conditions; changes in governmental regulations and policies; and other events, factors and risks previously and from time to time disclosed in Pacific Ethanol’s filings with the Securities and Exchange Commission including, specifically, those factors set forth in the “Risk Factors” section contained in Pacific Ethanol’s Form 10-K and in the preliminary prospectus supplement relating to the proposed offering filed with the Securities and Exchange Commission on March 8, 2012 and September 20, 2012, respectively.

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