19 November 2025

Invinity Energy Systems plc

("Invinity" or the "Company")

Construction Begins at LoDES Project Site

First deliveries of 20.7 MWh battery to commence on schedule

Invinity Energy Systems plc (AIM: IES) (OTCQX: IESVF), a leading global manufacturer of utility-grade energy storage, is pleased to announce that construction has now commenced at the LoDES project site in Uckfield, East Sussex, UK.

Above: Jonathan Marren, CEO, alongside project team members and partners at the LoDES project site

On 1 August 2025 the Company announced that the project had been granted planning approval and that it had received confirmation from DESNZ that the project would receive a £10m grant, the maximum amount available.

The majority of the civil works associated with the project, which have now commenced, are expected to be completed in the next eight weeks, supporting the delivery of 20.7 MWh of Invinity Vanadium Flow Batteries (VFBs) and a 3 MWp solar array. The Company expects shipping of the VFBs to commence within the next three weeks with delivery and installation completed in Q1 2026. As a result, Invinity expects to receive and recognise the £10m DESNZ grant during FY 2025, a significant amount of which has already been received to date.

Above: Invinity VFBs ready for collection from the Motherwell facility

This milestone demonstrates the Company's commitment to delivering this strategic project, with Jonathan Marren, CEO, and other key project stakeholders attending a groundbreaking event held earlier this week. The site, which is currently scheduled to commence operation once connected to the grid in the second half of 2026, will be home to the largest operating vanadium flow battery in Europe and become an important asset both to the Company and the UK grid.

The co-located VFB and PV site design allows excess solar energy generated during the day to be stored and discharged onto the UK grid through a single point of connection during peak periods and overnight as required. The VFB will also provide valuable flexibility to the UK grid, including, but not limited to, the provision of Dynamic Response Services, participation in the Capacity Market and undertaking wholesale power trading activity in the Day Ahead and Intraday markets.   

As previously indicated, the Company confirmed that it would proceed with the solar array if such a move to co-locate with a generation asset was deemed to be commercially and operationally advantageous. Having fully assessed the opportunity, Invinity has decided to develop and own the solar array itself as this will enhance financial returns for the project as well as facilitating a simpler operational structure. The incremental capex cost of the solar array is approximately £1.4m, which will be funded from the Company's existing resources which were augmented by the fundraising in September 2025.

Invinity views having the entire site under its ownership and control as a significant advantage, improving financial returns to the Company from the asset and maximising value on disposal or other monetisation event in the future. This approach also offers Invinity the maximum amount of operational flexibility in order to showcase the capabilities of its technology at a critical time for the widespread adoption of Vanadium Flow Batteries. The Company has also gained valuable experience in project development as a result of this process and has already utilised learnings to further reduce deployment costs for our customers and inform ongoing product development.

Jonathan Marren, Chief Executive Officer at Invinity said:

"Projects like this sit at the heart of what we at Invinity strive to achieve - the deployment of safe, durable and UK-made long duration energy storage that advances the country's efforts to reduce the dependence on natural gas which has contributed to the UK having some of the highest electricity prices globally. Deploying Invinity batteries allows for greater penetration of low-cost renewable energy onto the grid which will reduce energy bills whilst progressing the UK's clean power ambitions as well as supporting the creation of numerous clean energy jobs.

"We are particularly grateful to DESNZ and the National Wealth Fund who have been instrumental in supporting the delivery of this project, which is a UK and European first of a kind. This project will provide valuable information for us and our customers to help the future development of long duration energy storage in the UK and globally. We look forward to delivering our batteries in the coming weeks and connecting the project to the grid next year."

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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 1 to hundreds 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].