Important Information and Where to Find It

This communication may be deemed to be solicitation material in respect of the proposed transaction between AES and Horizon Parent, L.P. In connection with the proposed transaction, AES expects to file a proxy statement on Schedule 14A with the Securities and Exchange Commission (“SEC”). AES also may file other documents with the SEC regarding the proposed transaction. This communication is not a substitute for the proxy statement or any other document AES has filed or may file with the SEC and send to its stockholders in connection with the proposed transaction. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE PROXY STATEMENT AND ANY OTHER RELEVANT DOCUMENTS THAT ARE FILED OR WILL BE FILED WITH THE SEC, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THESE DOCUMENTS, CAREFULLY AND IN THEIR ENTIRETY, BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION AND RELATED MATTERS. Investors and security holders will be able to obtain free copies of the proxy statement (when available) and other documents that are filed or will be filed with the SEC by AES through the SEC’s website at www.sec.gov or through AES’ website at https://www.aes.com/investors/ or by contacting AES’ Investor Relations Team at invest@aes.com.

Participants in the Solicitation

AES, its directors and officers and other employees may be deemed to be participants in the solicitation of proxies from AES’ stockholders in connection with the proposed transaction. Additional information regarding the identity of the participants, including a description of their direct or indirect interests, by security holdings or otherwise, will be set forth in the proxy statement and other materials to be filed with the SEC in connection with the proposed transaction (if and when they become available). Information relating to the foregoing can also be found in the “Compensation Discussion & Analysis,” “Security Ownership of Certain Beneficial Owners, Directors, and Executive Officers” and “Proposal 1: Election of Directors” sections in AES’ proxy statement for its 2025 annual meeting of stockholders, which was filed with the SEC on March 19, 2025 (the “Annual Meeting Proxy Statement”). To the extent holdings of securities by potential participants (or the identity of such participants) have changed since the information printed in the Annual Meeting Proxy Statement, such information has been or will be reflected on AES’ Initial Statements of Beneficial Ownership on Form 3 and Statements of Change in Ownership on Form 4 that are filed or will be filed with the SEC. You may obtain free copies of these documents (when available) using the sources indicated above.

Cautionary Statement Regarding Forward-Looking Statements

This communication includes certain “forward-looking statements” within the meaning of, and subject to the safe harbor created by, the federal securities laws, including statements related to the proposed transaction between AES and Horizon Parent, L.P. (the “Transaction”), including financial estimates and statements as to the expected timing, completion and effects of the Transaction. These forward-looking statements are based on AES’ current expectations, estimates and projections regarding, among other things, the expected date of closing of the Transaction and the potential benefits thereof, its business and industry, management’s beliefs and certain assumptions made by AES, all of which are subject to change. Forward-looking statements involve a number of risks and uncertainties, because they relate to events and depend upon future circumstances that may or may not occur, such as the consummation of the Transaction and the anticipated benefits thereof. These and other forward-looking statements are not guarantees of future results and are subject to risks, uncertainties and assumptions that could cause actual results to differ materially from those expressed in any forward-looking statements. Important risk factors that may cause such a difference include, but are not limited to: (i) the completion of the Transaction on anticipated terms and timing; (ii) the risk that the conditions to the completion of the Transaction, including obtaining required stockholder and regulatory approvals, are not satisfied in a timely manner or at all; (iii) potential litigation relating to the Transaction, including resulting expense or delay, and the effects of any outcomes related thereto; (iv) the risk that disruptions from the Transaction will harm AES’ business, including current plans and operations; (v) the ability of AES to retain and hire key personnel; (vi) potential adverse reactions or changes to business relationships resulting from the announcement or completion of the Transaction; (vii) continued availability of capital and financing and rating agency actions; (viii) certain restrictions during the pendency of the Transaction that may impact AES’ ability to pursue certain business opportunities or strategic transactions; (ix) significant transaction costs associated with the Transaction; (x) the possibility that the Transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events; (xi) the occurrence of any event, change or other circumstance that could give rise to the termination of the Transaction, including in circumstances requiring AES to pay a termination fee or other expenses; (xii) competitive responses to the Transaction; and (xiii) the risks and uncertainties pertaining to AES’ business, including those set forth in Part I, Item 1A of AES’ most recent Annual Report on Form 10-K and Part II, Item 1A of AES’ subsequent Quarterly Reports on Form 10-Q, as such risk factors may be amended, supplemented or superseded from time to time by other reports filed by AES with the SEC. These risks, as well as other risks associated with the Transaction, will be more fully discussed in the proxy statement to be provided to AES’ stockholders in connection with the Transaction. While the list of factors presented here is, and the list of factors to be presented in the proxy statement will be, considered representative, no such list should be considered a complete statement of all potential risks and uncertainties. Unlisted factors may present significant additional obstacles to the realization of forward-looking statements. These forward-looking statements speak only as of the date they are made, and AES does not undertake to and specifically disclaims any obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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