Invinity Energy Systems’ announcement that 9 UK developers have selected its ENDURIUM vanadium flow batteries for their LDES Cap & Floor bids highlights the value of this scheme. These project proposals, each at or above 400 MWh, demonstrate that Cap & Floor mechanisms are unlocking market confidence and investment in proven, non-lithium energy storage technologies.
This is a major win for the flow battery sector. The Cap & Floor framework provides essential revenue certainty, allowing developers and manufacturers to scale with confidence, supporting grid resilience, clean energy integration, and domestic job creation. Flow batteries, with their durability and safety, are ideally suited to meet the UK’s long-duration storage needs, and the Scheme is rightly rewarding this.
The fact that multiple UK developers, including major players such as Frontier Power, have integrated flow batteries into their bids is clear evidence that Cap & Floor-style mechanisms directly support energy system flexibility and industrial growth.
This announcement is further proof that Europe must introduce a similar Cap & Floor mechanism to ensure a strong and sovereign LDES industry. Europe is at risk of lagging behind if it does not implement long-term revenue certainty frameworks for storage technologies like flow batteries. Europe is still facing increasing costs of curtailment, and without long duration storage, this will continue.
After facing costs of £402 million for curtailment from 2020-2021 of mostly renewable energy in the UK, the Cap & Floor mechanism is now able to help deal with these costs. This gives Europe a clear reason to follow suit. Regulatory tools such as this are not only effective, they are essential to meeting Europe’s decarbonisation and strategic autonomy goals, as well as reducing significant curtailment costs.
FBE continues to urge EU policymakers to act decisively by introducing a robust LDES revenue model at EU level, similar to the UK’s Cap & Floor Scheme. The time to accelerate flow battery deployment is now.
“Since this LDES scheme was first launched, the Invinity team has been engaging closely with numerous developers to submit high quality bids ahead of the deadline” said Jonathan Marren, Chief Executive Officer at Invinity. “We are delighted with the positive feedback that we have received from our partners, with significant quantities of our UK made vanadium flow batteries being proposed for this important scheme as a result. Should these bids be successful, we believe the build out of our ENDURIUM batteries across the country will not only help to lower energy costs for consumers but also help to provide wider economic benefits across the UK as we scale our operations.”
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