The information contained within this Announcement is deemed by Invinity Energy Systems plc to constitute inside information as stipulated under the Market Abuse Regulation (EU) No. 596/2014 as it forms part of UK law by virtue of the European Union (Withdrawal) Act 2018 ("MAR").

23 September 2025

Invinity Energy Systems plc

("Invinity" or the "Company")

16.7 GWh of Endurium Eligible for Cap and Floor Projects

Invinity Energy Systems plc (AIM: IES) (OTCQX: IESVF), a leading global manufacturer of utility-grade energy storage, is pleased to announce that 21 project bids, submitted by four developers and representing a total of approximately 16.7 GWh of Invinity's Endurium™ battery technology, have this morning been announced by Ofgem as eligible for the UK LDES Cap and Floor Scheme.

Ofgem will now invite eligible projects to submit more detailed bids. Ofgem and NESO will undertake final project assessment in Q4 2025 and aim to publish the initial decision list of projects that will be offered a contract under the Scheme in Spring 2026. Final decisions on projects are due in Summer 2026. 

Today's positive development follows the Company's announcement on 23 June 2025 that nine energy storage developers had chosen Invinity's technology for the Scheme. This covered 34 individual project bids. This group includes, but is not limited to, Invinity's partner Frontier Power, with whom Invinity is targeting gigawatt-hour deployment of the Company's technology in the UK and abroad.

The Company believes that that every eligible project announced today which has specified the use of a Vanadium Flow Battery (or combination of such with another technology) will propose the use of Invinity's Endurium batteries.

All but one of the confirmed eligible projects are in Track 1 of the Scheme which are deliverable by 2030. Track 2 projects are deliverable by 2033.

The announcement notes that 171 valid applications representing 52.6 GW of discharge capacity were initially received by Ofgem by the submission deadline of 9 June 2025. The announcement confirms that 77 projects, with discharge capability totalling 28.7 GW for a minimum of eight hours, have met the programme criteria and are therefore eligible to progress to the project assessment stage.

The Company cautions that due to the competitive nature of this process, there is no guarantee any, and highly unlikely that all, of these project bids will ultimately be successful under the Scheme. However, Invinity's management team continue to believe that the Company is well positioned to secure a level of orders which could be highly material to Invinity's future trading.

The Company expects to provide an update once further announcements on the Scheme are made by Ofgem.

Jonathan Marren, Chief Executive Officer at Invinity said:

"Invinity is tremendously excited at the number and quality of projects using our vanadium flow batteries that have been selected to progress to the next stage under Ofgem's Cap and Floor scheme. Ofgem's determination of eligibility further validates the role Invinity's safe, durable VFB solutions can play in delivering clean, low-cost power to the UK's future electric grid. In our view, the developers who have chosen to support this vision by submitting projects applying Invinity's products include some of the most capable, experienced teams in the UK energy ecosystem. The entire Invinity team are excited to advance through the Project Assessment stage, and progress towards delivering UK-manufactured products to this groundbreaking programme."

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Notes to Editors

Invinity Energy Systems plc (AIM: IES) (OTCQX: IESVF) manufactures vanadium flow batteries for large-scale, high-throughput energy storage requirements of business, industry and electrical networks.

Invinity's factory-built flow batteries run continually with no degradation for over 30 years, making them suitable for the most demanding applications in renewable energy production. Energy storage systems based on Invinity's batteries are safe, reliable, and economical, and range in size from less than 250 kilowatt-hours to tens of megawatt-hours.

Invinity was created in April 2020 through the merger of two flow battery industry leaders: redT energy plc and Avalon Battery Corporation. With more than 190 MWh of systems deployed, contracted for delivery or awarded for projects across more than 90 sites in 17 countries, Invinity is active in all major global energy storage markets and has operations in the UK, Canada, USA and China. Invinity Energy Systems plc is quoted in the UK on AIM and trades in the USA on OTCQX.

To find out more, visit invinity.com, sign up to our monthly Investor Newsletter here or contact Investor Relations on via +44 (0)20 4551 0361 or [email protected].