REG - Invinity Energy Sys - 12 MWh Sale for U.S. Project

Invinity Energy SystemsAnnouncement

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RNS Number : 3797M  Invinity Energy Systems PLC  22 December 2025

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").

 

 

22 December 2025

Invinity Energy Systems plc

 

("Invinity" or the "Company")

 

12 MWh Sale for U.S. Project

Endurium battery system to be deployed at PNNL's Richland, Washington campus

 

Invinity Energy Systems plc (AIM: IES) (OTCQX: IESVF), a leading global
manufacturer of utility-grade energy storage, is pleased to announce the sale
of a 12 MWh Endurium battery system to Pacific Northwest National Laboratory
(https://www.pnnl.gov/) ("PNNL").

 

The batteries will be installed at PNNL's Richland, Washington campus and used
to demonstrate the ability of advanced energy storage in general, and
Invinity's vanadium flow batteries ("VFBs") in particular, to deliver the
durable, flexible services needed for a future low-cost, high-reliability
electrical grid. In proving their ability to provide 24-hour energy discharge,
improve operational resilience and decrease peak site energy demand,
Invinity's VFBs are expected to further deliver significant benefits to PNNL.

 

This sale follows the recent inauguration visit by U.S. Energy Secretary Chris
Wright to PNNL's Grid Storage Launchpad
(https://irtools.co.uk/88/story/7451594c-02cb-4cbf-b367-3532c34475e1) , where
he initiated the testing of an Invinity battery. This comes at a time when
energy storage continues to gain prominence within the U.S. power market as
grid operators begin to prioritise storage duration over short-term capacity.
For example, PJM, the largest grid operator in the U.S., is elevating the
priority of eight- and ten-hour duration systems as it looks to support new
resources that can balance load and deliver energy when its system is
potentially at risk.

 

As previously announced by the Company in September 2023, this project is
supported by funds from the U.S. Department of Energy which were made
available
(https://irtools.co.uk/88/story/1156ab16-a286-4eaa-9b68-4d1fdc6183ed) to a
number of U.S. projects which plan to feature Invinity's technology. Delivery
of the Invinity batteries is expected in H2 2026.

 

Matt Harper, President at Invinity said:

 

"From its very beginnings, PNNL has been one of the most innovative
laboratories in energy, pioneering the technologies and solutions that form
the backbone of today's electric grid in every corner of the globe.

 

"Invinity is thrilled to be providing one of the main components of PNNL's
most recent facility, the Grid Storage Launchpad, to prove how our safe,
durable, long duration vanadium flow batteries can help enhance the future
electric grid. The inherent characteristics of our proven technology,
including its ability to deliver both instantaneous demand response and
extended discharge durations over decades of service, makes it the ideal
solution for maximising this potential.

 

"With the support and engagement of the Department of Energy, we look forward
to working with PNNL's researchers to guide the technology, policy and
regulation that will enhance the role that Invinity's vanadium flow batteries
can play on our future electric grid, in the U.S. and beyond."

 

Stay up to date with news from Invinity. Join the distribution list for the
Company's monthly investor newsletter here
(https://invinity.us13.list-manage.com/subscribe?u=5b8cb168d806f615c67752bf8&id=26dd4280e1)
.

 

Enquiries:

 

 Invinity Energy Systems plc                                 +44 (0)20 4551 0361
 Jonathan Marren, Chief Executive Officer

 Joe Worthington, Senior Director, Corporate Affairs

 Canaccord Genuity (Nominated Adviser and Joint Broker)      +44 (0)20 7523 8000
 Henry Fitzgerald-O'Connor / Harry Pardoe / Charlie Hammond

 VSA Capital (Joint Broker)                                  +44 (0)20 3005 5000
 Andrew Monk / Andrew Raca

 

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 (https://invinity.com/?utm_source=rns) ,
sign up to our monthly Investor Newsletter here
(https://invinity.us13.list-manage.com/subscribe?u=5b8cb168d806f615c67752bf8&id=26dd4280e1)
or contact Investor Relations on via +44 (0)20 4551 0361 or ir@invinity.com
(mailto:ir@invinity.com) .

 

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