X0206 3 2021-03-22 0 0001842279 ArcLight Clean Transition Corp. II ACTDU 0001405456 Revers Daniel R C/O ARCLIGHT CLEAN TRANSITION CORP. 200 CLARENDON STREET, 55TH FLOOR BOSTON MA 02116 1 0 1 0 Class B ordinary shares Class A ordinary shares 7766250 I By ArcLight CTC Holdings II, L.P. As described in the issuer's registration statement on Form S-1 (File No. 333-252730) under the heading "Description of Securities--Founder Shares", the Class B ordinary shares, par value $0.0001, will automatically convert into Class A ordinary shares, par value $0.0001, of the issuer at the time of the issuer's initial business combination on a one-for-one basis, subject to adjustment for share splits, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date. The Class B ordinary shares beneficially owned by the reporting person include up to 1,031,250 shares that are subject to forfeiture to the extent the underwriters of the initial public offering of the issuer's securities do not exercise in full their over-allotment option. The securities reported herein are held by Sponsor. The reporting person has voting and investment discretion with respect to the securities held by the the Sponsor and may be deemed to have shared beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose. Exhibit List: Exhibit 24 - Power of Attorney /s/ Daniel R. Revers 2021-03-22