ENDURIUM Selected for UK LDES Cap & Floor Bids.

23 June 2025

Invinity Energy Systems plc

("Invinity" or the "Company")

ENDURIUM Selected for Multiple UK LDES Cap & Floor Bid Applications

9 developers select ENDURIUM for LDES Cap and Floor bids in first application window

Ahead of the commencement of the International Flow Battery Forum this week, at which Invinity is exhibiting, and further to the Company's 12 March 2025 announcement regarding the opening of the UK LDES Cap & Floor Scheme (the "Scheme"), Invinity Energy Systems plc (AIM: IES) (OTCQX: IESVF), a leading global manufacturer of utility-grade energy storage, provides an update following the close of the Scheme's first application window earlier this month.

The Company is highly encouraged to have received a significant level of interest from UK battery developers planning to use ENDURIUM batteries in their project bids. This outcome has validated the Company's previous decision to release a product in Q4 2024, which was developed with the Scheme and others like it in mind. It also further underlines Invinity's belief that the Scheme has not only been designed to support the significant build out of LDES assets but also enable growth in high-quality energy storage manufacturing jobs in the UK over the next 5 years in line with the goals and objectives of the UK Government.

Project bids in the first Scheme bid window had to be submitted and commenced grid connection applications ahead of the application deadline on 9 June 2025. These bids are now under review by Ofgem to confirm eligibility before they progress to the final assessment phase which is expected to conclude in H1 2026. Successful bids are expected to generate orders for delivery in 2028-2030.

The Company is pleased to confirm that 9 UK energy storage developers have selected Invinity's ENDURIUM batteries for their project bids into the Scheme which are each at or above the minimum 400MWh in size. Eligibility criteria also requires the technology to have already been deployed and operating at scale and the Company believes the proven nature of Invinity's vanadium flow batteries has been a key driver for the high level of interest received.

Certain of these developers have proposed ENDURIUM for multiple projects. This includes but is not limited to Invinity's partner Frontier Power, noting ENDURIUM has been selected for approximately half of their project bid portfolio.

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

In parallel to the Company's activity in the UK, Invinity continues to pursue a range of commercial opportunities, particularly across North America, Europe and Asia, as well as progressing discussions with a number of new partners both in these regions and elsewhere.

Updates will be provided in due course as appropriate.

Jonathan Marren, Chief Executive Officer at Invinity said:

"Since this LDES scheme was first launched, the Invinity team has been engaging closely with numerous developers to submit high quality bids ahead of the deadline. We are delighted with the positive feedback that we have received from our partners, with significant quantities of our UK-made vanadium flow batteries being proposed for this important scheme as a result. Should these bids be successful, we believe the build out of our ENDURIUM batteries across the country will not only help to lower energy costs for consumers but also help to provide wider economic benefits across the UK as we scale our operations."

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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 25 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 ir@invinity.com.