Retail Offer through the BookBuild Platform

The Board of Powerhouse is pleased to announce a retail offer via BookBuild (the "Retail Offer") of up to 125 million ordinary shares of 0.01p each ("Ordinary Shares") in the capital of the Company (the "Retail Offer Shares") at an issue price of 0.2 pence per New Ordinary Share (as defined below) (the "Issue Price"), designed to raise up to £250,000.

The Company has separately announced a conditional placing to raise £400,000 through the issue of 200 million shares (the "Placing Shares") to new and existing institutional and other investors at the Issue Pirce (together with the Retail Offer Shares, the "New Ordinary Shares") at the Issue Price (the "Placing" and together with the Retail Offer, the "Issue"). A separate announcement has been made regarding the Placing and its terms. For the avoidance of doubt, the Retail Offer is not part of the Placing. The Issue is dependent on the passing of relevant resolutions at a General Meeting to be held on or around 14 May 2026.

• The net proceeds of the Placing and Retail Offer will be primarily used as follows:

o Ballymena - Progress planning and permitting activities, develop FEED package to allow tenders for EPCm and work towards FID.

o Research and Development - Continue work on development of alternative outputs from DMG, i.e. investigate alternative fuels etc., as well as adding additional equipment to the FTU process to prove at scale.

o Working Capital to include additional projects, sales and marketing, strengthening C-Suite.

The Retail Offer is conditional on, inter alia, the New Ordinary Shares to be issued pursuant to the Retail Offer being admitted to trading on the AIM market operated by the London Stock Exchange ("Admission"). Admission of the New Ordinary Shares pursuant to the Retail Offer is expected to take place on 18 May 2026. Completion of the Retail Offer is conditional, inter alia, upon the completion of the Placing.

Expected Timetable in relation to the Retail Offer

Retail Offer

The Company values its retail shareholder base, which has supported the Company alongside institutional investors for a number of years. Given the support of retail shareholders, the Company believes that it is appropriate to provide its retail shareholders in the United Kingdom the opportunity to participate in the Retail Offer. The Company is therefore making the Retail Offer available in the United Kingdom through the financial intermediaries which will be listed, subject to certain access restrictions, on the following website: https://www.bookbuild.live/deals/4QDX91/authorised-intermediaries

Turner Pope Investments (TPI) Ltd ("Turner Pope") will be acting as retail offer coordinator in relation to this Retail Offer (the "Retail Offer Coordinator").

The Retail Offer will be open to eligible investors in the United Kingdom at 7:05am on 23/04/2026. The Retail Offer is expected to close at 4:30pm on 24/04/2026. Investors should note that financial intermediaries may have earlier closing times. The Retail Offer may close early if it is oversubscribed.

If any intermediary has any questions about how to participate in the Retail Offer on behalf of existing retail shareholders, please contact the Retail Offer Coordinator at email: info@turnerpope.com, Tel; 020 3657 0050 or BookBuild at email: support@bookbuild.live.

There is a minimum subscription of £100.00 per investor under the terms of the Retail Offer which is open to investors in the United Kingdom subscribing via the intermediaries which will be listed, subject to certain access restrictions, on the following website: https://www.bookbuild.live/deals/4QDX91/authorised-intermediaries

UK Product Governance Requirements

EU Product Governance Requirements