29 November 2021

Invinity Energy Systems plc

("Invinity" or the "Company")

Posting of Circular, Notice of General Meeting and Investor Webinar

Further to the oversubscribed Placing to raise £25 million and a proposed Open Offer to raise up to approximately £4 million, announced on 18 November 2021, Invinity Energy Systems plc (AIM:IES), confirms that a Circular to shareholders providing further details of the Placing and the Open Offer and seeking approval for the Open Offer, Conditional Placing and the issue of the Warrants was posted to shareholders on Friday 26 November. The Circular contains a Notice of General Meeting to be held on 14 December 2021 at 11:00 a.m. (UK Time). An electronic copy of the Circular will shortly be available for download from the Company's website: www.invinity.com/investors/resources.

Timetable of principal events

Investor Webinar

In advance of the General Meeting, Invinity's management team will host a live, virtual presentation with Q&A at 4:30 p.m. on 2 December 2021. This presentation is open to all shareholders, other than those in Restricted Jurisdictions, and will provide an opportunity to hear management present Invinity's investment proposition and answer questions on the recent placing.

To register your interest, please visit the registration portal by 5:00 p.m. (UK time) on 1 December 2021. Questions can be submitted in advance via ir@invinity.com or via the webinar portal on the day.

General Meeting Arrangements

The General Meeting will be held at the offices of Osborne Clarke LLP, One London Wall, London, EC2Y 5EB on 14 December 2021 at 11:00 a.m. At present, it is possible under guidelines to allow a certain number of shareholders at the meeting and the Company is keen to welcome those who wish to attend in person given the constraints faced in 2020 due to the COVID-19 pandemic.

Shareholders wishing to attend the General Meeting are kindly requested to RSVP to ir@invinity.com by 5:00 p.m. (UK time) on 10 December 2021. This is necessary for safety and security reasons.

Given the constantly evolving nature of the COVID-19 pandemic, it is possible that these arrangements may change. Shareholders are therefore strongly encouraged to use their proxy vote and appoint the Chairman of the meeting as their proxy. This will ensure that shareholder votes are counted, even if physical attendance at the meeting becomes restricted. Shareholders are reminded that completed proxy forms may be scanned and submitted via email to #UKCSBRS.ExternalProxyQueries@computershare.co.uk. The deadline for submission of proxy votes to the registrar is no later than 11:00 a.m. on 10 December 2021.

Please contact the IR team via ir@invinity.com if you require any assistance with the proxy voting process.

All defined and capitalised terms have the same meaning as the Company's announcement at 7:00 a.m. on 18 November 2021.

Enquiries:

Notes to Editors

Invinity Energy Systems plc (AIM:IES) manufactures 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 25 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 over 10 MWh of systems deployed to date across 40 sites in 14 countries, Invinity is active in all major global energy storage markets and has operations in the UK, Canada, USA, China and South Africa. Invinity Energy Systems plc is listed on the London Stock Exchange.

To find out more, visit invinity.com or call Investor Relations on +44 (0)204 551 0361