RedT

RedT was a British energy-storage company that developed vanadium flow batteries (VFBs) for grid-scale and commercial applications. It was one of the early European specialists in non-lithium, long-duration storage, and its technology was designed for heavy cycling, long service life and low fire risk. The company is now part of Invinity Energy Systems, which describes itself as a leading manufacturer of modular, factory-built vanadium flow batteries and markets its products under the Endurium™ and Endurium Enterprise™ names. Invinity's current positioning reflects the technology lineage that RedT helped to establish. The company states that it delivers "Energy Storage Beyond Lithium" and that its systems are utility-grade safe, with zero risk of thermal runaway, a 30+ year service life, and the lowest lifetime cost per MWh stored and discharged. Invinity reports over 8,000 MWh of total energy discharged since 2022 in its global figures and over 11,000 MWh in its UK figures, and it operates in the UK, the United States and India. In the UK, Invinity describes itself as the UK's largest manufacturer of grid-scale energy storage, producing UK-designed and manufactured vanadium flow batteries from facilities in the Central Belt of Scotland. In the United States, it is based in Vista, California, and supports grid-scale and commercial & industrial customers. In India, Invinity entered the market in September 2025 alongside strategic partner Atri Energy Transition, aiming to offer made-in-India vanadium flow batteries. RedT's own brand identity is now largely historical, but it remains a recognisable name in the flow-battery sector and is recorded in Wikidata as a manufacturer of flow batteries. The RedT website, redtenergy.com, remains associated with the brand.

RedT was a UK-based developer of vanadium flow batteries, a class of electrochemical storage that uses liquid electrolytes held in external tanks rather than solid electrodes. Flow batteries are valued for long service life, unlimited cycling and low fire risk, making them suitable for grid-scale and long-duration applications. RedT was among the European companies that sought to commercialise this technology for stationary energy storage. The company's website, redtenergy.com, remains associated with the brand, and Wikidata records RedT as a manufacturer of flow batteries. RedT later became part of Invinity Energy Systems, which today markets modular, factory-built vanadium flow batteries under the Endurium™ and Endurium Enterprise™ names. Invinity describes itself as having "changed the game for non-lithium storage" and positions its products as the most proven, safe and cost-effective alternative to lithium-ion batteries. Invinity's current operations span the UK, the United States and India. In the UK, it manufactures vanadium flow batteries in the Central Belt of Scotland and describes itself as the UK's largest manufacturer of grid-scale energy storage. In the United States, it is based in Vista, California, and serves grid-scale and commercial & industrial customers, with plans to expand manufacturing capacity in California. In India, Invinity entered the market in September 2025 with strategic partner Atri Energy Transition, targeting made-in-India vanadium flow batteries. Invinity reports over 8,000 MWh of total energy discharged since 2022 globally and over 11,000 MWh in the UK. Its systems are marketed as having zero risk of thermal runaway, a 30+ year service life, and the lowest lifetime cost per MWh stored and discharged. These claims reflect the technical and commercial trajectory that RedT helped to pioneer in the flow-battery sector.

• RedT is recorded as a manufacturer of flow batteries.

  [5]RedTwikidata.org
• RedT becomes part of Invinity Energy Systems, which markets Endurium™ and Endurium Enterprise™ vanadium flow batteries.

  [1]Energy Storage Beyond Lithium / Invinity Energy Systemsinvinity.com
• Invinity enters the Indian energy storage market in September 2025 with strategic partner Atri Energy Transition.

  [4]Invinity in India - Invinityinvinity.com

Non-lithium, long-duration vanadium flow battery storage for grid-scale and commercial applications.

• Vanadium flow batteries (VFBs)

  Modular, factory-built flow batteries for grid-scale and commercial energy storage, marketed by Invinity under the Endurium™ and Endurium Enterprise™ names.

• 2022.02.23

  Reported2022.02.28

  REDTAG opens store in Muzahimiyah Mall[6]REDTAG在穆扎希米耶购物中心开设门店menafn.com

  REDTAG launched a retail store in Muzahimiyah Mall in Riyadh Province, Saudi Arabia, and introduced an opening offer of SAR 30 gift vouchers on qualifying purchases.

• 2021.11.24

  Reported2021.12.05

  REDTAG wins RetailME Award for brand campaign[7]REDTAG获RetailME年度品牌宣传活动奖menafn.com

  REDTAG won the RetailME Award 2021 for “Most Admired Brand Campaign of the Year,” recognizing its WearASmile brand campaign.

• 2021.08.22

  Reported2021.08.22

  REDTAG announces limited-period price offer[8]REDTAG宣布限时价格优惠saudigazette.com.sa

  REDTAG announced a limited-period offer placing a wide range of selections in the SR10/15/20 price bands at its outlets in Saudi Arabia.

• 2021.06.09

  Reported2021.06.09

  REDTAG opens store at City Center Mall in Doha[9]REDTAG在多哈City Center Mall开设门店rli.uk.com

  REDTAG launched a new store at City Center Mall in Doha, Qatar, offering its summer collections and homeware and lifestyle ranges.

• 2021.04.11

  Reported2021.04.13

  REDTAG launches Ramadan Bonanza raffle[10]REDTAG推出斋月Bonanza抽奖活动gulfnews.com

  REDTAG launched a Ramadan raffle in collaboration with Samsung, offering customers across the GCC the chance to win around 600 Galaxy S21 Ultra 5G smartphones. The five-week raffle began on 11 April and was set to last until 15 May 2021.

• 2020.04.02

  Reported2020.04.02

  redT rebrands as Invinity Energy Systems[11]redT更名为Invinity Energy Systemssolarpowerportal.co.uk

  Following its merger with Avalon, redT officially rebranded as Invinity Energy Systems; the article says shareholders had approved the change.

• 2020.04.01

  Reported2020.04.02

  redT and Avalon merger approved by shareholders[11]redT更名为Invinity Energy Systemssolarpowerportal.co.uk

  Shareholders approved the merger of redT and Avalon at an extraordinary general meeting on April 1, 2020. The article reports that the merger had completed.

Read more

1. 1Energy Storage Beyond Lithium / Invinity Energy Systemsinvinity.com
2. 2Invinity Energy Systems in the UKinvinity.com
3. 3Invinity Energy Systems in the United Statesinvinity.com
4. 4Invinity in India - Invinityinvinity.com
5. 5RedTwikidata.org
6. 6REDTAG在穆扎希米耶购物中心开设门店menafn.com
7. 7REDTAG获RetailME年度品牌宣传活动奖menafn.com
8. 8REDTAG宣布限时价格优惠saudigazette.com.sa
9. 9REDTAG在多哈City Center Mall开设门店rli.uk.com
10. 10REDTAG推出斋月Bonanza抽奖活动gulfnews.com
11. 11redT更名为Invinity Energy Systemssolarpowerportal.co.uk
12. 12REDTAG collaborates with Samsung for Ramadan bonanza raffle prizes worth SR3 millionsaudigazette.com.sa