SunCoke Energy (SXC) 8-K Suncoke Energy, Inc. Stockholders Approve Acquisition

Exhibit 99.1

Investors and Media:

Andy Kellogg & Kory Kutzke

(630)824-1907

SUNCOKE ENERGY, INC. STOCKHOLDERS APPROVE ACQUISITION

OF SUNCOKE ENERGY PARTNERS, L.P.

Lisle, Ill. (June 27, 2019) — SunCoke Energy, Inc. (NYSE: SXC) (“SunCoke”) and SunCoke Energy Partners, L.P. (NYSE: SXCP) (“SXCP”) today announced that SunCoke’s stockholders approved the issuance of SunCoke common stock in connection with the previously announced merger transaction (the “Merger”), pursuant to which SunCoke will acquire all of SXCP’s outstanding common units that SunCoke does not already own. The Merger is subject to customary closing conditions and is expected to close before the market opens on June 28, 2019. Effective June 28, 2019, SXCP’s common units will cease to be traded publicly on the New York Stock Exchange.

ABOUT SUNCOKE ENERGY, INC. AND SUNCOKE ENERGY PARTNERS, L.P.

SunCoke Energy, Inc. (NYSE: SXC) and its sponsored master limited partnership subsidiary, SunCoke Energy Partners, L.P. (NYSE: SXCP), supply high-quality coke for the blast furnace production of steel under long-term,take-or-pay contracts that pass through commodity and certain operating costs to customers. We utilize an innovative heat-recovery technology that captures excess heat for steam or electrical power generation. Our cokemaking facilities are located in Illinois, Indiana, Ohio, Virginia and Brazil. We have more than 55 years of cokemaking experience serving the integrated steel industry. Through SXCP, we provide export and domestic material handling services to coke, coal, steel, power and other bulk and liquids customers. Our logistics terminals have the collective capacity to mix and transload more than 40 million tons of material each year and are strategically located to reach Gulf Coast, East Coast, Great Lakes and international ports. To learn more about SunCoke Energy, Inc. and SunCoke Energy Partners, L.P., visit our website at www.suncoke.com.

FORWARD-LOOKING STATEMENTS

Some of the statements included in this press release constitute “forward-looking statements” (as defined in Section 27A of the Securities Act of 1933, as amended and Section 21E of the Securities Exchange Act of 1934, as amended). Forward-looking statements include all statements that are not historical facts and may be identified by the use of such words as “believe,” “expect,” “plan,” “project,” “intend,” “anticipate,” “estimate,” “predict,” “potential,” “continue,” “may,” “will,” “should” or the negative of these terms or similar expressions. Forward-looking statements are inherently uncertain and involve significant known and unknown risks and uncertainties (many of which are beyond the control of SXC) that could cause actual results to differ materially. Such risks and uncertainties include, but are not limited to domestic and international economic, political, business, operational, competitive, regulatory and/or market factors affecting SXC, as well as uncertainties related to: pending or future litigation, legislation or regulatory actions; liability for remedial actions or assessments under existing or future environmental regulations; gains and losses related to acquisition, disposition or impairment of assets; recapitalizations; access to, and costs of, capital; the effects of changes in accounting rules applicable to SXC; and changes in tax, environmental and other laws and regulations applicable to SXC’s businesses.

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Forward-looking statements are not guarantees of future performance, but are based upon the current knowledge, beliefs and expectations of SXC management, and upon assumptions by SXC concerning future conditions, any or all of which ultimately may prove to be inaccurate. The reader should not place undue reliance on these forward-looking statements, which speak only as of the date of this press release. SXC does not intend, and expressly disclaims any obligation, to update or alter its forward-looking statements (or associated cautionary language), whether as a result of new information, future events or otherwise after the date of this press release except as required by applicable law. In accordance with the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, SXC has included in its filings with the Securities and Exchange Commission (the “SEC”) cautionary language identifying important factors (but not necessarily all the important factors) that could cause actual results to differ materially from those expressed in any forward-looking statement made by SXC. For information concerning these factors, see SXC’s SEC filings such as its annual and quarterly reports and current reports on Form8-K, copies of which are available free of charge on SXC’s website at www.suncoke.com. All forward-looking statements included in this press release are expressly qualified in their entirety by such cautionary statements. Unpredictable or unknown factors not discussed in this release also could have material adverse effects on forward-looking statements.

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