Summary

Claim independently assessed to be very substantial.

ATOME, provides an update further to previous announcements regarding the Power Purchase Agreement ("PPA") for the Villeta Project in Paraguay ("Villeta" or "Project").

ATOME remains in discussions relating to ATOME's shovel ready Villeta Project, the largest single foreign industrial investment in the history of Paraguay totaling US$665 million. Notwithstanding this, ATOME as a public company, having received positive legal advice, is mindful of its responsibilities to its shareholders and its obligations to protect its legitimate rights.

Against this background on 17 September 2026, ATOME PLC, through White & Case LLP, will today serve a Notice of Dispute and Intent to Submit a Claim to Arbitration on the Republic of Paraguay ("the Notice") pursuant to the Agreement between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of Paraguay for the Promotion and Protection of Investments ("the BIT"). In preparation of the Notice, the extent of the claim, if made, has been independently assessed by an internationally reputable damages expert as very substantial i.e. well into nine figures in US Dollars to the extent it would be, if made, one of the largest if not the largest ever claims against the Paraguay State under any bilateral investment treaty.

The Notice states that an investment dispute exists as a result of Paraguay's acts and omissions in violation of the BIT, including its revocation of the Presidential Decrees issued by the Paraguayan State that supported the Project and provided certainty on term and price under the PPA.

The Notice urges the Paraguayan State to engage in discussions to amicably resolve the matter.

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Statement from the Government of Paraguay in response to the Notice - 18 September 2026

Regarding the notification submitted by the company Atome

"The Attorney General's Office reports that, to date, there is no lawsuit or arbitration initiated against the Paraguayan State by Atome.

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