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").

3 August 2026

Invinity Energy Systems plc

("Invinity" or the "Company")

43 MWh Sale to U.S. Power Cooperative

Invinity technology to be deployed by Dairyland Power Cooperative across multiple sites in U.S. Midwest

Invinity Energy Systems plc (AIM: IES), a global leader in vanadium flow battery technology, is pleased to announce the sale of 43 MWh of battery systems to Dairyland Power Cooperative ("Dairyland") for deployment across long duration energy storage ("LDES") projects in the U.S. Midwest.

The project forms part of the Rural Energy Viability for Integrated Vital Energy ("REVIVE") programme which is being supported by funding from the U.S. Department of Energy which the Company previously announced in September 2023. Dairyland Power Cooperative supplies wholesale electricity to member-owned utilities serving communities across Wisconsin, Minnesota, Iowa and Illinois.

Invinity's vanadium flow batteries will be used to support grid resilience and reliability across multiple locations in Dairyland's Upper Midwest service territory, with delivery phase expected to commence in late 2027. The Company's Endurium technology was selected by Dairyland based on its ability to perform long duration charge/discharge cycles to support the network as demand and supply fluctuates. Invinity's strong track record of delivery in the U.S. market and strong field performance of existing assets was also an important consideration in the selection process.

Headquartered in Wisconsin, Dairyland plays a critical role in maintaining reliable power supplies across a large rural service territory and has been selected by U.S. Department of Energy to lead the REVIVE programme, a multi-site long-duration energy storage initiative intended to strengthen grid resilience and support the integration of vital energy resources across rural Midwestern communities. Further information on the projects will be released by Dairyland following an announcement event later this summer.

This deal represents Invinity's largest sale to date and builds upon recent U.S. commercial traction achieved by the Company including the 32 MWh sale to Pacific Steel Group in California and a 2 MWh sale to a C&I site in Wisconsin.

Matt Harper, President at Invinity said:

"This is a major win for Invinity and another clear sign that demand for proven, flexible, durable storage solutions is accelerating in the United States. Dairyland's projects are exactly the kind of demanding, real-world applications Endurium was built for: deep cycling, long life and dependable performance across multiple sites. For rural cooperatives, where reliability and affordability are critically important, our technology can help strengthen the grid, manage peaks and improve power quality without passing unnecessary cost on to consumers. With three U.S. project wins in quick succession, we at Invinity are excited to be building real momentum and creating a stronger order book for our U.S.-based manufacturing capacity."

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About Dairyland Power Cooperative: Founded in 1941, Dairyland provides the wholesale electrical requirements and other services for 24 Class A member distribution cooperatives, 2 Class B members and 27 municipal utilities in the Upper Midwest. In turn, these cooperatives and municipals meet the energy needs of over 800,000 people. Dairyland delivers electricity over 3,700 miles of transmission lines and 400 distribution substations located throughout the system's 44,500 square mile service area.

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Notes to Editors

Invinity Energy Systems plc (AIM: IES) is a world-leading manufacturer of vanadium flow batteries for energy storage. Built in our factories in the UK and Canada, the Company's proven, commercialised, longer duration energy storage technology has been deployed at scale and dispatched gigawatt-hours of electricity for customers across the world.

Invinity's safe, scalable and durable battery technology is a trusted and safer alternative to lithium-ion batteries. Endurium VFBs are engineered for heavy-duty, high throughput applications, they don't wear out, cannot catch fire and are designed to be operated for 30 years or more. Our products address the challenges of our global energy system, unlocking the power of renewable generation by delivering energy storage without limits.

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].