Invinity Energy Systems

Invinity Energy Systems plc is a UK-Canadian manufacturer of vanadium flow batteries for grid-scale and long-duration energy storage. It was formed in April 2020 by the merger of redT energy and Avalon Battery Corporation of Vancouver, and was admitted to the Alternative Investment Market that month, trading as IES.

Invinity Energy Systems plc
TypePublic limited company
AIM: IES
IndustryEnergy storage
Founded2 April 2020
Headquarters
London
,
United Kingdom
Key peopleJonathan Marren (CEO)
ProductsVanadium flow batteries
Revenue£8.2 million (2025)
£24.1 million pre-tax loss (2025)

History

redT energy began a strategic review in March 2019 following financial difficulties and agreed outline merger terms with Avalon Battery in July 2019. Shareholders approved the transaction on 1 April 2020 and the enlarged company was admitted to AIM the following day. Its main manufacturing site is at Bathgate in West Lothian, Scotland.

Technology

The batteries store energy in a non-flammable liquid vanadium electrolyte held in external tanks and pumped through cell stacks, so that the power rating is set by the stacks and the stored energy by the volume of electrolyte. Invinity states a design life of 30 years without loss of capacity from cycling. FlexBase, which selected the technology for a data centre campus, cited fire safety as its main reason, as the cells cannot enter thermal runaway. The VS3 product line was replaced by the Endurium platform in 2025.

Projects

Its largest installation delivered to date is a 20.7 MWh system in the United Kingdom. In May 2026 FlexBase selected Invinity to design and deliver 1.5 GWh, expandable to 2.1 GWh, at the Laufenburg Technology Center data centre campus in Laufenburg, Switzerland; on announced projects this would be the largest flow battery installation in the world. An engineering, procurement and construction contract with Equans Switzerland was signed in August 2026. The company agreed in August 2026 to supply 43 MWh to Dairyland Power Cooperative in the United States, and in June 2026 announced a 32 MWh system for a steel mill in Kern County, California.

References

  1. 1 2 Colthorpe, Andy (24 August 2026). "Invinity confirms EPC contract award for 2.1GWh 'landmark' flow battery in Switzerland". Energy-Storage.News. Retrieved 13 November 2026.
  2. 1 2 "Result of EGM" (Press release). redT energy plc. 1 April 2020. RNS Number 4662I. Retrieved 13 November 2026.
  3. ↑ "RedT rebrands as merger completes, raising just £155k from its Open Offer". Solar Power Portal. 2 April 2020. Retrieved 13 November 2026.
  4. ↑ "Invinity warns UK investment could move overseas after Ofgem LDES selections". Electrical Review. 7 September 2026. Retrieved 13 November 2026.
  5. 1 2 Murray, Cameron (21 May 2026). "Invinity lands contract for 2.1GWh flow battery in Switzerland, share price soars 60%". Energy-Storage.News. Retrieved 13 November 2026.
  6. ↑ Metcalfe, Zack (16 July 2025). "In renewables storage, an old technology finds a new home". Canada's National Observer. Retrieved 13 November 2026.
  7. 1 2 Murray, Cameron (4 June 2026). "Giga-scale Swiss data centre project will be 'world-first' in carving out niche for flow batteries, Invinity says". Energy-Storage.News. Retrieved 13 November 2026.
  8. ↑ "2025 Financial Results" (Press release). Invinity Energy Systems plc. 1 June 2026. RNS Number 4055G. Retrieved 13 November 2026.
  9. ↑ Bonner, April (5 August 2026). "Invinity sells 43MWh long-duration flow battery system to US Midwest rural electric cooperative". Energy-Storage.News. Retrieved 13 November 2026.