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WILSONVILLE, Ore., June 7, 2021 (GLOBE NEWSWIRE) – ESS Tech, Inc. (“ESS Inc.”, “ESS” or the “Company”), a manufacturer of long-life iron flux batteries for the trade and utilities large-scale energy storage applications, today announced that Eric Dresselhuys, Chief Executive Officer, will virtually present at the Cowen Summit on Sustainability and Energy Transition on Wednesday, June 9 at 8:10 a.m. Pacific time.

A live webcast of Mr. Dresselhuys’ presentation will be available at https://wsw.com/webcast/cowen93/essi/1965600, and a replay will be available for a year after. A transcript of the presentation will also be posted within three days of the event. The live webcast, replay and transcript will also be posted on the ESS website at www.essinc.com/investisseurs.

About ESS inc.

ESS Inc. designs, manufactures and deploys environmentally sustainable, low-cost iron-flux batteries for long-life large-scale and commercial energy storage applications requiring 4 to 12 hours of flexible energy capacity. The Energy Warehouse ™ and Energy Center ™ use the abundant iron, salt and water on earth for electrolyte, resulting in a sustainable and environmentally safe energy storage solution for the environment. global renewable energy infrastructure. Founded in 2011, ESS Inc. enables project developers, utilities, and commercial and industrial facility owners to transition to more flexible lithium-ion-free storage that is better suited to the grid and the environment. For more information visit www.essinc.com.

Additional information and where to find it

This communication is made with respect to the proposed transaction involving ESS and ACON S2 Acquisition Corp. (“ACON S2”). A full description of the terms of the transaction will be provided in a registration statement on Form S-4 to be filed with the SEC by ACON S2 which will include a prospectus relating to the securities of the combined company to be issued in connection with the business. business combination and a proxy statement regarding the ACON S2 shareholders’ meeting to vote on the business combination. ACON S2 urges its investors, shareholders and other interested persons to read, when available, the proxy statement / preliminary prospectus as well as other documents filed with the SEC as these documents will contain important information about ACON S2, the Company and the transaction. Once the registration statement is effective, the proxy circular / final prospectus to be included in the registration statement will be mailed to ACON S2 shareholders on a registration date to be established for voting on the business combination. companies proposed. Once available, shareholders will also be able to obtain a copy of S-4, including the Proxy Circular / Prospectus, and other documents filed with the SEC free of charge, by directing a request to: ACON S2 1133 Connecticut Avenue NW Suite 700, Washington, DC 20036. The preliminary and final proxy / prospectus to be included in the registration statement, once available, can also be obtained, free of charge, from the SEC website (www.sec.gov).

Participants in the call for tenders

ACON S2 and ESS and their respective directors and officers may be considered participants in the proxy solicitation of ACON S2 shareholders in connection with the proposed transaction. Information about the directors and officers of ACON S2 and their ownership of the securities of ACON S2 is set out in the documents filed by ACON S2 with the SEC. To the extent that ACON S2’s holdings of securities have changed from the amounts printed in the ACON S2 registration statement on Form S-1, these changes have been or will be reflected on the change of ownership statements on Form 4 filed with the SEC. Additional information regarding the interests of such persons and other persons who may be considered to be participants in the proposed transaction may be obtained by reading the proxy statement / solicitation of consent statement / prospectus relating to the proposed transaction. when it becomes available. You can obtain free copies of these documents as described in the previous paragraph.

No offer or solicitation

This communication is not a statement of proxy or a solicitation of proxy, consent or authorization with respect to any security or with respect to the potential transaction and does not constitute an offer to sell or a solicitation of ” an offer to buy the securities of ACON S2, ESS or the amalgamated company, and there will be no sale of such securities in any state or jurisdiction in which such an offer, solicitation or sale would be illegal prior to the registration or qualification under the securities laws of that state or jurisdiction. No offer of securities will be made except by means of a prospectus meeting the requirements of the law on securities.

Forward-looking statements

This communication contains certain forward-looking statements, including statements regarding the expectations, hopes, beliefs, intentions or strategies of ACON S2, ESS or their management teams regarding the future. The words “anticipate”, “believe”, “continue”, “could”, “estimate”, “expect”, “intention”, “could”, “could”, “,,,”,, ,, “,”, “,” Plan “,” plan “,” should “,” would “and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not prospective. These forward-looking statements are based on the current expectations and beliefs of ACON S2 and ESS regarding future developments and their potential effects on ACON S2, ESS or any successor entity of the proposed transactions. Many factors could cause actual future events to differ materially from the forward-looking statements in this presentation, including, but not limited to: (i) the risk that the proposed transactions will not be completed in a timely manner or not anything that could adversely affect the price of ACON S2 shares, (ii) non-compliance with the conditions for carrying out the envisaged transactions, (iii) the occurrence of any event, change or other circumstance that could lead to the termination of the combination companies, (iv) the effect of announcing or awaiting proposed transactions on business relationships, operating results and SSE activities in general, (v) the risks that the proposed transactions disrupt ESS’s current plans and operations, (vi) changes in competition and highly regulated industries in which ESS plans to operate, variations in operating performance on between competitors, changes in laws and regulations affecting SSE activities and changes in combined capital structure and (vii) the ability to implement business plans, forecasts and other expectations after the completion of the proposed transactions, and to identify and realize additional opportunities. There can be no assurance that future developments affecting ACON S2, ESS or any successor entity of the proposed transactions will be as we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond the control of ACON S2 or ESS) or other assumptions which may cause actual results or performance to differ materially from those expressed or underperformed. understood by these forward-looking statements. . You should carefully consider the foregoing factors and other risks and uncertainties described in the “Risk Factors” section of the ACON S2 registration on Form S-1 (File No. 333-248515), the Declaration of registration on Form S-4 is expected to be filed in connection with the business combination, and other documents filed by ACON S2 from time to time with the SEC. These documents identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in forward-looking statements. Except as required by law, ACON S2 and ESS undertake no obligation to update or revise forward-looking statements, whether as a result of new information, future events or otherwise. Neither ACON S2 nor ESS provides assurance that ACON S2 or ESS, or the combined company, will meet its expectations.


Investors: Erik Bylin[email protected]

Media: Gene HuntTrevi Communications, Inc. 978.750.0333 x.101[email protected]

Source: ESS, Inc.


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