8 September 2025

Invinity Energy Systems plc

("Invinity" or the "Company")

Invinity Expands Product Offering with Launch of Endurium Enterprise^TM

New product optimised for commercial and industrial customers officially launches during RE+, North America's largest clean energy event

Invinity Energy Systems plc (AIM: IES) (AQSE: IES) (OTCQX: IESVF) a leading global manufacturer of utility-grade energy storage, today formally launches Endurium Enterprise for general sale. This new addition to the Company's product line is specifically designed for commercial and industrial ("C&I") businesses looking to deploy proven, safe and cost-effective on-site energy storage to deliver low-cost, low-carbon electricity on demand.

Above: A rendered image showing Endurium Enterprise

Prospective C&I customers within Invinity's pipeline have reported they highly value the ease of co-location with solar power, streamlined deployment, high fire-safety and total flexibility over 30 years of operation already proven by Endurium™. Endurium Enterprise expands the reach of that platform with capabilities specific to those customers' needs, based on significant interest from this market segment over the past year.

Endurium Enterprise has at its core the Company's latest modular vanadium flow battery ("VFB") platform, the Endurium module. Available in configurations starting from 4 MWh, Endurium Enterprise incorporates control, power conversion and other features needed for the most demanding microgrid and behind-the-meter applications.

A growing number of Invinity's non-flammable and highly durable VFBs are already dispatching low-cost renewable generation such as solar or wind for customers around the world. This adaptability explicitly demonstrates how C&I customers can apply Invinity's flexible, durable products to further reduce their electricity bills by using more self-generated clean energy. Additionally, the inherent safety characteristics of Invinity's VFBs mean they can be located in urban, industrial or rural areas where permitting and noise requirements are key considerations. Lower fire risk also means customers can expect significantly lower insurance premiums for their battery asset.

Visit Invinity's website for further information on Endurium Enterprise and to contact the Company's sales team to discuss commercial opportunities.

Matt Harper, President at Invinity said:

"Today is an important milestone in our continuing mission to make Endurium available to an ever-larger group of energy consumers. Operators of medium- to large-scale commercial and industrial sites, including factories, warehouses and datacentres, want to actively manage their site loads and self-generated power with energy storage that won't let them down. The Endurium platform has proven it can do that job reliably with the safety and flexibility site operators demand. The significant demand we see in this market is further enhancing our entire team's confidence in our products and our technology, and highlights how stepping up to ever-more demanding customer challenges can unlock further long-term benefits for Invinity."

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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].

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