Update to release of Audited Financial Results

21 May 2021

Invinity Energy Systems plc

("Invinity" or the "Company")

Update to release of 2020 Audited Financial Results

Further to its announcement on 30 April 2021, Invinity announces a short delay to the publication of its full-year audited results for the period ended 31 December 2020. The results will be released as soon as possible and within the regulatory requirement to publish during June. This decision was taken in consultation with the Company's auditor, PwC, and is due to the growth in operational activity and complexity over the last 18 months combined with the practical constraints of various lockdowns across its international offices.

The audit is well advanced and on 27 May, the Company will release a detailed operational and financial update for the period ended December 2020. Management will also engage with shareholders as previously planned.

Regarding the day-to-day activity of the business, the Company continues to perform in line with the Board's expectations and management remains enthusiastic about progress toward the many commercial and developmental initiatives announced by the Company in recent months.

Enquiries:

Notes to Editors

Invinity Energy Systems plc (AIM:IES) manufactures vanadium flow batteries for the large-scale energy storage requirements of businesses, industry and electricity networks.

Developed specifically for high-utilisation applications, Invinity's highly scalable, factory-built flow battery products make low-carbon renewable generation reliable and can run continually with no degradation, charging and discharging for over 25 years. 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 10MWh 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 .