Notice of Annual General Meeting

17 June 2025

Invinity Energy Systems plc

("Invinity" or the "Company")

Notice of Annual General Meeting

Following the release on 30 May 2025 of the Company's 2024 Full Year Results, Invinity Energy Systems plc (AIM: IES) (OTCQX: IESVF), a leading global manufacturer of utility-grade energy storage, announces that the Company's Annual General Meeting ("AGM" or "the Meeting") will be held at the offices of Canaccord Genuity, 88 Wood Street, London EC2V 7QR at 3.00 p.m. (UK Time) on Thursday 10 July 2025.

Notice of the AGM containing further information, along with the form of proxy, will be available for download via the Company's shareholder documents portal.

Voting

Shareholders are strongly encouraged to use their proxy vote and to appoint the Chair of the Meeting as their proxy so that their vote will be counted if ultimately they (or any other proxy they might otherwise appoint) are not able to attend. Note that submitting a proxy will not preclude Shareholders from attending and voting at the AGM in person if they wish to do so.

Completed forms of proxy should be returned to our Registrars at Computershare Investor Services PLC, The Pavilions, Bridgwater Road, Bristol, BS99 6ZY using the pre-paid envelope provided or scanned and emailed to #[email protected]. Completed proxies must be received by the registrar no later than 3.00 p.m. on Tuesday 8 July 2025.

For assistance in submitting forms of proxy, please contact our Registrar, Computershare, on +44 (0370) 703 6274 or by logging on to www.investorcentre.co.uk/contactus.

Attending the Meeting

Due to capacity constraints, Shareholders wishing to attend the AGM are requested to RSVP via [email protected] no later than 5.00 p.m. on Tuesday 8 July 2025.

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Enquiries:

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 [email protected].