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").

1 August 2025

Invinity Energy Systems plc

("Invinity" or the "Company")

10.8 MWh ENDURIUM Order Confirmed

Notice to Proceed received on 10.8 MWh order from Hungarian partner; Project expected to be shipped by year end

Further to the announcement on 12 March 2025, Invinity Energy Systems plc (AIM: IES) (OTCQX: IESVF), a leading global manufacturer of utility-grade energy storage, is pleased to confirm it has received a formal Notice to Proceed ("NTP") from STS Group in respect of a 10.8 MWh ENDURIUM battery system for delivery to a project in Hungary.

10.8 MWh of ENDURIUM batteries will be installed alongside a large-scale solar PV array as part of a large scale solar plus storage project in western Hungary. The project is supported by the European Union and is expected to receive debt funding from a major European bank. With Notice to Proceed now issued, Invinity is due a downpayment, allowing the manufacturing and order fulfilment process to commence ahead of shipment later this year.

STS Group is an engineering, procurement and construction (EPC) company based in Hungary, specialising in the design, development, commissioning and operation of renewable energy-based power plants, hybrid power plants, substations, switching stations and transmission lines. STS has worked with Invinity since 2023 and is considered a pioneer of non-lithium energy storage solutions in the region. The company, which was founded in 2002 and has completed over 100 projects across Hungary, previously purchased and installed a 1.5 MWh VS3 battery in March 2023. 

Jonathan Marren, Chief Executive Officer at Invinity said:

"Receiving NTP on this project is the final milestone and now allows us to progress to manufacturing and ultimately delivery of the batteries, confirming the first commercial deployment of ENDURIUM in Europe.

"This is an important event for Invinity both from a commercial perspective but also financially in providing a material portion of anticipated 2025 revenues."

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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 up to 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].