A London-based start-up believes its novel solid oxide technology can make green hydrogen commercially viable at last. The science is serious, a major electrolyser company is already involved, and the investment window is open.
Green hydrogen has been the fuel of the future for so long that sceptics could be forgiven for thinking it will stay that way. The economics have never quite worked. The technology has been too expensive, too inefficient, or both. And the big players in the energy sector have been watching and waiting rather than committing.
Hydrogen Solutions Ltd (Unlisted), a London-based company founded by James Busche, thinks it has the answer. Its H2 HotBox is a dual-mode solid oxide device that can produce green hydrogen from water and renewable electricity, then run in reverse to generate clean power from that stored hydrogen. One box, two jobs, and a claimed efficiency well above anything currently on the market.
Busche is disarmingly direct about the commercial challenge facing the whole sector. “Everybody wants to be green,” he says, “but nobody wants to pay for it.” His pitch is that Hydrogen Solutions has cracked something more valuable than environmental virtue: genuine cost competitiveness with fossil fuels at a time when energy security is increasingly preoccupying governments everywhere.
Why the existing technology falls short
The two established electrolyser technologies, Alkaline and Proton Exchange Membrane, have served the industry well enough. But both carry fundamental flaws that have prevented green hydrogen from scaling. Alkaline, invented by NASA decades ago, runs at around 50–55% efficiency and degrades steadily as it operates. PEM is a step forward at around 65% efficiency and better suited to variable renewable inputs, but it requires increasingly scarce rare materials and still degrades fast.
The degradation issue is costly. Across all existing technologies, Busche says, operators face rebuilding costs of roughly 25% of original capital expenditure within five to seven years as plates become contaminated and performance drops. Bloom Energy, one of the better-known names in solid oxide fuel cells, will not even sell its technology; it only leases, because the maintenance burden is too unpredictable to pass to customers.
Hydrogen Solutions’ solid oxide approach runs at temperatures six to twelve times higher than its rivals, using that heat to do much of the energy work that competing systems ask electricity to do instead. The result, the company says, is efficiency above 90%, with a longer-term ambition that is more striking still. “With heat recovery,” Busche says, “we’re pretty confident we can get it over 100%.” The logic is that operating at 750 to 800 degrees Celsius allows the system to recycle some of its own waste heat back into the process, something no lower-temperature technology can do.
Why waste heat changes the equation
The key commercial insight is that the HotBox does not need to generate all its own heat. It can draw on the vast quantities of thermal energy that heavy industry currently wastes. Steel mills, cement plants, glass furnaces, chemical refineries and data centres all release enormous heat as a byproduct of their core operations.
Busche’s vision extends well beyond blast furnaces. Modern distribution warehouses, he points out, run massive refrigeration systems that generate substantial heat. Put solar panels on a five-acre roof, add a couple of wind turbines, run the surplus through a HotBox, and a retailer like Tesco or Aldi could in principle power its forklifts on hydrogen, eliminate the charging infrastructure that currently takes up significant floor space, replace diesel backup generators, and even convert its point-to-point delivery vehicles. The carbon footprint drops; so do the operating costs. “Amazon’s already doing this in a few select locations,” Busche notes.
Data centres, consuming ever more power to run artificial intelligence workloads and generating heat as a consequence, represent perhaps the largest single emerging application.
‘Nvidia inside’
Hydrogen Solutions is not trying to build electrolysers and compete head-on with established manufacturers like Plug Power (NASDAQ:PLUG) or ITM Power. Its model is to own the core technology and license it to the manufacturers who already have the factories, the customer relationships and the distribution. When the ‘Intel Inside’ analogy is suggested, Busche reaches for a more contemporary comparison. “They don’t own the technology that people actually see,” he said. “They own what runs it.” Nvidia, in other words.
None of the ten largest electrolyser manufacturers currently offers a solid oxide product. The company’s argument is that all of them eventually will, because different applications suit different technologies, and their customers will demand the full suite.
Major electrolyser company in the picture
The most significant detail to emerge from conversations with Busche is one that does not appear in the formal investor materials. A major electrolyser company has agreed to act as testing partner for the third and final phase of the development programme, with the pilot likely to be installed on the Humber, a region dense with heavy industrial facilities and committed to becoming a major UK hydrogen hub.
The plan is to take an existing commercial electrolyser and replace its core technology with the HotBox stack. It is a logical fit: roughly 90% of what sits in front of and behind the core of any electrolyser is common across all technologies, so the integration work is less complex than it sounds.
Busche is frank about where the company hopes this leads. His personal expectation is that the testing partner, or one of the other named partners, ultimately acquires the business outright. An IPO is in the three-year plan as a credible alternative, but “someone’s going to buy it, and that would likely be the best payoff for shareholders.”
The people behind the technology
The company draws on more than a decade of funded research at the University of Queensland, where Professor John Zhu, a specialist in solid oxide fuel cells, sits on the advisory board. The technical anchor is a major industry hydrogen expert acting as Hydrogen Solutions’ technical adviser, who previously founded Ceres Power, the solid oxide company spun out of Imperial College in 2000 that peaked at a stock market value of around £3 billion.
The commercial credentials are substantial. Founding partner Dr Paul Groves is a former Managing Director of Petrofac and served as Commercial Director at Shell, overseeing the company’s $20 billion Gas-to-Liquids plant in Qatar.
Where the technology sits
Investors should be clear-eyed about the development stage. The company has built and tested at least 17 stacks, the most advanced of which, a 35-layer unit, generated 512 watts, ran for 220 hours at 750 degrees without measurable degradation, and has now been followed by a 70 to 75-layer stack currently in build in Australia. A pilot installation site on the Humber has been identified. But an integrated commercial HotBox has not yet been completed, and Busche puts the realistic timeline for first field deployment at around 2028, subject to funding.
The total programme budget to commercial readiness is £12.5 million. The current raise is targeting £3 million to fund the next phase of stack development and testing at the IAAPS research facility in North Bristol, a dedicated hydrogen testing centre run by the University of Bath.
A market growing at extraordinary speed
The backdrop could hardly be more favourable. The global green hydrogen market was valued at $8.78 billion in 2024 and is forecast to reach $199 billion by 2034. Roughly 96% of hydrogen produced today still comes from fossil fuels. Bringing the cost down is not just a commercial opportunity; it is increasingly a matter of national energy security.
Busche’s point on this is worth hearing directly. “Every country in the world can produce hydrogen today,” he says. At a moment when European governments are still reckoning with the consequences of dependence on Russian gas, and trade and geopolitical tensions are making long hydrocarbon supply chains look vulnerable, that is not a trivial argument.
The investment case
The current fundraise is SEIS and EIS eligible, meaning qualifying UK investors can claim income tax relief of 50% and 30% respectively, materially improving the risk-adjusted entry. Revenue projections run from $2.3 million in 2027 to $107 million by 2030. Those numbers are targets built on licensing agreements and product sales that do not yet exist, and should be read as a statement of direction rather than contracted income.
The risks are real, the timeline is long, and the gap between a promising laboratory stack and a commercial product in the ground remains significant. But the science is serious, the pedigree is genuine, a major electrolyser company is engaged, and the market the company is targeting is one of the most consequential of the coming decade.
For investors with patient capital and an appetite for early-stage technology, Hydrogen Solutions is a name worth watching.
Hydrogen Solutions is seeking investment via its website at hydrogensolutionsltd.com. This article is not financial advice. Early-stage investments carry significant risk, including the risk of total loss.
