The United Kingdom wants to become the world benchmark for this very particular type of energy storage…

The UK is banking on fire-safe batteries to become a green superpower.

While China is stacking gigawatt hours and Saudi Arabia is building giant storage facilities in the desert, Britain has just completed delivery of a battery of a different kind. Smaller, but without fire risk, and made in Scotland.

In Uckfield, in East Sussex, the British company Invinity Energy Systems completed the delivery of the 90 batteries that will make up the Copwood VFB Energy Hub on Tuesday, May 12. Total: 20.7 megawatt hours of storage capacity, coupled with a small 3 megawatt solar power plant. Once commissioned later this year, the facility will become Europe’s largest vanadium flow battery. Don’t you see what it is? Follow the guide and we’ll explain everything!

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If we’re talking about energy storage, theoretically you should think lithium-ion. And for good reason: this technology represents 99.33% of the global battery market in 2026, according to Fortune Business Insights. It is what equips our telephones, our electric cars and almost all of the large storage facilities in service on the planet.

The vanadium flow battery (or vanadium redox battery) works on a radically different principle. Rather than solid cells, it uses two large tanks filled with a liquid based on water and vanadium (a metal found in particular in special steels). The energy is stored in the chemistry of this liquid which circulates between the tanks. Result: no risk of thermal runaway, no possible fire, and a lifespan announced in decades rather than years.

Remember that in January 2025, the Californian site of Moss Landing, one of the largest in the world with its 3 gigawatt hours, experienced a fire which forced the evacuation of neighboring residents. This type of incident has transformed fire safety into a political subject in many municipalities faced with storage projects. For Invinity, this is precisely where its commercial advantage comes into play.

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David versus Goliath: the numbers hurt

Let’s be honest: 20.7 MWh, on a global scale, is tiny. To understand the gap, here are the main storage projects in operation or under construction.

The Masdar project in Abu Dhabi alone will be almost 1,000 times larger than Copwood. But comparing these facilities is like comparing a sprinter to a marathon runner: it’s not the same race. Lithium-ion mega-batteries store a lot, but for short periods of time, typically two to four hours. Vanadium is aimed at long-term storage, those famous eight to twelve hours which allow solar energy produced during the day to be switched to consumption in the evening.

That’s exactly what Copwood will do. Surplus production from the site’s solar panels will be stored during the day, then injected into the network when consumption increases. Capacity equivalent to what approximately 3,000 British homes consume in a day.

London’s industrial bet

The project does not happen by chance. The United Kingdom has become the leading European market for battery storage, with an estimated valuation of $2.49 billion in 2026, ahead of Germany and France. And Ofgem, the British energy regulator, is due to announce in the coming weeks the final decisions of its long-term storage support program, nicknamed the Mechanism. cap and floor (ceiling and floor), which guarantees a profitability framework for investors for super batteries of several hundred megawatt hours.

Invinity has been shortlisted for several of these future projects. If everything goes as planned, the company expects to create nearly 1,000 jobs at its Scottish factories in Motherwell and Bathgate.

“If we are serious about building an electricity system dominated by renewable energy, we need to stop wasting the energy we strive to produce,†said Jonathan Marren, chief executive of Invinity. “By building Europe’s largest vanadium flow battery here and manufacturing it in Scotland, we are demonstrating that the transition to clean energy can strengthen our energy security. HAS”

The financing is also British. The National Wealth Fund, a British sovereign wealth fund, is a major shareholder in Invinity and has directly contributed to Copwood. The project also benefited from a grant from the Department of Energy Security, as part of the LoDES (long-term storage demonstration) program.

La geopolitique du vanadium

Behind the chemistry lies a strategic question: who controls the raw materials for batteries? Today, it’s China, by far. Chinese manufacturers hold about 80% of the global market for lithium-ion cells, and Beijing controls most of the critical minerals needed to make them. A dependence that Westerners have difficulty digesting, especially since trade and geopolitical tensions complicate access to lithium, cobalt and nickel.

Vanadium offers a partial way out. Its sources of supply are more geographically diversified, and the technology itself is less demanding in rare metals. For the United Kingdom, which has made “Net Zero†and energy security two converging political pillars since the conflict in the Middle East, the equation is attractive: a national technology, manufactured locally, which reduces dependence on imported natural gas while emancipating itself from Chinese supply chains.

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The great unknown

There remains one major detail: is vanadium economically viable compared to the steamroller of lithium-ion? Costs per kilowatt hour remain higher, and each month that passes sees the prices of lithium-ion cells fall a little further. The International Renewable Energy Agency predicts a further 50% drop in installed costs by 2030 for storage technologies in general.

Invinity’s bet, and London’s more broadly, is that the long duration and security will end up justifying the additional cost. Especially in an electricity mix increasingly dominated by solar and wind power, where the challenge is no longer to produce but to shift over time. A thesis that the markets will only really validate when the first “super batteries” from the British program are connected, from 2028.

Until then, the Copwood VFB Energy Hub will fulfill a very concrete function: prove that the thing works, on a scale, on the British network. And incidentally, give Invinity the story that an industrial SME needs to exist in the face of the Chinese and Korean giants of the sector. The word “green superpower†is dropped by the general director. We’ll see, in five years, if the formula will have held up.

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