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LONDON - The UK energy regulator Ofgem has deemed 21 project bids utilizing Invinity Energy Systems’ Endurium battery technology eligible for the UK Long Duration Energy Storage (LDES) Cap and Floor Scheme, representing approximately 16.7 GWh of storage capacity, according to a company press release statement.
The eligible projects were submitted by four developers and are among 77 total projects with 28.7 GW of discharge capability that met the program criteria. Ofgem initially received 171 valid applications representing 52.6 GW of discharge capacity by the June 9, 2025 submission deadline.
Invinity believes that all eligible projects specifying Vanadium Flow Battery technology will use the company’s Endurium batteries. Nearly all confirmed eligible projects fall under Track 1 of the scheme, which requires delivery by 2030, with one project in Track 2, deliverable by 2033.
The announcement follows Invinity’s June 23 statement that nine energy storage developers had selected its technology for the scheme, covering 34 individual project bids. These developers include Frontier Power, with whom Invinity is targeting gigawatt-hour deployment in the UK and internationally.
Ofgem will now invite eligible projects to submit more detailed bids, with final project assessment scheduled for Q4 2025. The regulator aims to publish an initial decision list of projects offered contracts under the scheme in Spring 2026, with final decisions expected in Summer 2026.
Jonathan Marren, Chief Executive Officer at Invinity, called the eligibility determination a validation of the role the company’s vanadium flow batteries can play in the UK’s future electric grid.
The AIM-listed company (AIM:IES) cautioned that due to the competitive nature of the process, there is no guarantee that any or all of these project bids will ultimately be successful under the scheme.
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