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info@atomeplc.com Villeta and Business Update Investor Meet Company Presentation www.atomeplc.com 5 October 2026 Peter Levine, Chairman Olivier Mussat, CEO 1
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Disclaimer 2 The information contained herein has been provided solely for information purposes and does not purport to be comprehensive or contain all the information that may be required by recipients to evaluate Atome PLC (the “Company”). This presentation and the information contained in it has not been independently verified and no reliance should be placed on it or the opinions contained within it. In furnishing the presentation, the Company reserves the right to amend or replace the presentation at any time and undertakes no obligation to provide the recipient with access to any additional information. The Company may, but shall not be obliged to, update or correct the information set forth in this presentation or to provide, update or correct any additional information. The Company does not make any representation or warranty, express or implied, as to the accuracy or completeness of this presentation or the information contained herein and, except in the case of fraud, the Company shall not have any liability (direct, indirect, consequential or otherwise) for the information contained in, or any omissions from, this presentation. This presentation does not constitute a prospectus or offering memorandum or offer in respect of any securities and should not be considered as a recommendation by the Company, its affiliates, representatives, officers, employees or agents to acquire an interest in the Company. This presentation does not constitute or form part of any offer or invitation to sell or issue or any solicitation of any offer to purchase or subscribe for any securities in any jurisdiction, nor shall it (or any part of it) or the fact of its distribution, form the basis of or be relied upon in connection with, or act as any inducement to enter into, any contract or commitment or engage in any investment activity whatsoever relating to any securities. The contents of this presentation have not been approved by any person for the purposes of section 21 of the Financial Services and Markets Act 2000, as amended (“FSMA”). Reliance on the presentation for the purpose of engaging in any investment activity may expose an individual to a significant risk of losing all of the property or other assets invested. Any person who is in any doubt about the subject matter to which the presentation relates should consult a person duly authorised for the purposes of FSMA who specialises in the acquisition of shares and other securities. This presentation contains forward-looking statements which involve known and unknown risks, uncertainties and other factors which may cause the Company's actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Certain forward-looking statements are based upon assumptions of future events which may not prove to be accurate. These forward- looking statements speak only as to the date of the presentation and neither the Company nor any of its members, directors, officers, employees, agents or representatives assumes any liability for the accuracy of such information, nor is the Company under any obligation to update or provide any additional information in relation to such forward-looking statements. Nothing in this presentation is, or should be relied upon as, a promise or representation as to the future. Recipients of this presentation outside the United Kingdom should inform themselves about and observe any applicable legal restrictions in their jurisdiction which may be relevant to the distribution, possession or use of this presentation and recognise that the Company does not accept any responsibility for contravention of any legal restrictions in such jurisdiction. The Company’s securities have not been and will not be registered under the United States Securities Act of 1933, as amended ("Securities Act"), or under the securities legislation of any state of the Unites States nor under the relevant securities laws of Australia, Canada, Japan or the Republic of South Africa and may not be offered or sold in the United States except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and in compliance with any applicable state securities laws. This presentation contains where so noted extracts (“Extracts”) from the Green Ammonia and Fertiliser Market Study Report (“Report”) prepared by NexantECA Limited (“NexantECA”) for ATOME PLC (“ATOME”) in October 2023. The Report was based on information publicly available or that was provided by ATOME or third parties at the time of issue. NexantECA did not independently verify such information at that time, nor has it updated the Report since its issue. The Report was prepared solely for ATOME and neither it nor the Extracts may be relied upon by any other party. NexantECA disclaims all liability for any loss or damage arising from or connected with the use of or reliance upon any information contained in this Report by any such party. The Extracts may not be reproduced, distributed, or used without first obtaining NexantECA’s prior written consent.
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3 OVERVIEW Executive Summary 1 Final Investment Decision (“FID”) declared at flagship Villeta Project US$665m project finance completed and unconditional FID declared in May 2026: projected as the largest single foreign industrial investment in Paraguay's history 2 Villeta Project Disruption The Presidential Decrees underpinning the agreed PPA were revoked in June 2026 without notice or consultation; project funds cannot be drawn until the PPA is resolved 3 Seeking a Resolution Good-faith discussions with the Government and ANDE remain the priority; Notice of Dispute under the UK–Paraguay BIT preserves the rights of shareholders 4 Partners remain supportive Lenders, equity investors and commercial partners, including Casale and Yara, remain supportive of the Villeta Project and ATOME’s approach 5 Development of Pipeline Continues Brazil, ATOME Power and up to 9GW of global prospect; building on existing partnerships VILLETA OVERVIEW US$665m Total project finance (US$420m debt, US$245m equity) 260,000 t Low-carbon Calcium Ammonium Nitrate fertiliser production per year 100% Offtake with Yara International (minimum 10 years) 5,000 Direct and indirect jobs during construction and operations of the facility
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4 VILLETA PPA Villeta Project PPA: what happened Decree regime and agreed PPA • Decrees 5306/5307 (16 January 2026): fixed Power -to-X tariff of US$30.15/MWh for 15 years on 123.25MW; 25 -year term • PPA agreed with Government and ANDE which included necessary lender provisions Revocation (June 2026) • Decrees revoked without notice or consultation; ATOME learned of it from the press on 9 June • Decree tariffs withdrawn; PPA remains unsigned Stakeholder Engagement • Ongoing talks with the Government and relevant stakeholders; backed by lender group • New ANDE President (July 2026) – ATOME seeks to engage to reach a resolution Notice of termination of 2022 PPA • ATOME serves notice of termination on 2022 PPA (effective end 2026) • Avoids any potential liability and preserves rights of ATOME under the UK-Paraguay Bilateral Investment Treaty
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5 NOTICE OF DISPUTE Notice of Dispute and Intent to Submit a Claim for Arbitration under the UK-Paraguay Bilateral Investment Treaty ATOME's priority remains an amicable solution that allows Villeta to proceed. The Notice of Dispute is a precautionary step, taken on legal advice, to preserve the Company's rights while discussions continue. 1 17 SEPTEMBER 2026 Formal notice served Notice served on Paraguay through White & Case LLP under the 1981 UK–Paraguay Bilateral Investment Treaty, inviting discussions on an amicable solution 2 NEXT THREE MONTHS Dialogue continues ATOME continues to work in good faith with the Government and ANDE towards a new PPA 3 NO RESOLUTION CASE Arbitration as a last resort Should no viable solution be found, ATOME may submit a claim to ICSID in Washington D.C. What this means for shareholders • Preserves ATOME's legal rights without closing the door to negotiation • An independent damages expert has assessed the potential claim as very substantial (well into nine figures, US$) • Advice indicates a good chance that legal costs could be funded by a third party • All other ATOME projects continue unaffected
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6 BUSINESS DEVELOPMENT Leveraging ATOME’s platform Brazil: green fertiliser • Pre-feasibility studies commenced, replicating Villeta's partnerships, design and know-how • NDA discussions with substantial Brazilian power companies to use competitive renewable power • Favourable regulation and business environment in Brazil (e.g. new Profert law) • Partnering with Casale, re-using Villeta's engineering, procurement and execution experience cuts development time and cost ATOME Power: Paraguay and elsewhere • Independent power generation and battery energy storage division, created in 2025 • Proposed 300MWp solar PV project • Options taken to acquire over 4,000 hectares (9,880 acres) in the Villeta area • Confirmed financial and technical feasibility support from multilateral fund Strategic relationships built at Villeta Casale EPC and technology Yara Fertiliser offtake Sungrow Electrolysers ,, solar PV and batteries Finance Network of equity investors and lending group 25+ projects under evaluation 9GW of potential capacity Further prospects continue to be brought to management
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Thank You ATOME PLC Carrwood Park, Selby Road, Leeds, LS15 4LG info@atomeplc.com www.atomeplc.com @atomeplc @AtomePlc 7