Ki 13 raises $5M seed for affordable synthetic fuels

Ki 13, the London deeptech formerly known as Ki Hydrogen, has raised a $5M seed round led by HICO Investment Group to build an industrial pilot plant for its biomass electrolysis technology, with Burgest, Triple Impact Ventures, GiTV and Desai Ventures participating alongside non-dilutive match funding from Innovate UK.

Synthetic fuels have a maths problem: everyone agrees we need them, and almost nobody can afford to make them. And yet the announcement that landed on 2 September suggests the cost curve is exactly where a small London team thinks it can win. Below, I lay out the round, the chemistry behind it, and why a $5M seed in North Acton says something about how Europe builds its molecule startups.

A $5M seed, matched by the state

The round, announced on 2 September 2026 and reported by Tech.eu, brings together lead investor HICO Investment Group – returning after backing the company’s pre-seed – with Burgest, Triple Impact Ventures, GiTV and Desai Ventures, plus non-dilutive match funding from Innovate UK. No valuation was disclosed.

The money has one job: an industrial pilot plant to prove Ki 13’s biomass electrolysis at a scale that customers and future investors can touch. “Economics drive meaningful change, and the world needs a radical cost difference in how synthetic fuels and chemicals are made,” co-founder and CEO Koji Muto said in the announcement.

One reactor, two feedstocks

What does Ki 13 actually sell? Not fuel – feedstocks. Its electrochemical process breaks down lignocellulosic biomass residues, the woody leftovers agriculture and forestry produce anyway, into two separate streams: green hydrogen and biogenic CO2. Those happen to be the two ingredients every synthetic fuel producer needs, whether the end product is sustainable aviation fuel, e-methanol or e-methane.

The company’s own figures, cited in the Tech.eu report, explain the pitch. Its process targets roughly 25 kWh per kilogram of hydrogen, against around 50 kWh for conventional water electrolysis, and roughly 300 kWh per tonne of CO2, against the 2,000-3,000 kWh that direct air capture burns for the same tonne. Halve the energy bill on one input and cut it by a factor of up to ten on the other, and the fuel at the end of the chain stops being a luxury good. Company figures at pilot scale, to be clear – which is precisely what this round exists to test.

The team page lists eleven people, and the company grew out of the UK’s climate deeptech pipeline: Carbon13 and Founders Factory both sit among its backers and partners, and IAG – the group behind British Airways – is named on its site. The rebrand from Ki Hydrogen to Ki 13 tells its own story: hydrogen was only ever half the product.

A $24bn market compounding at 22%

The segment Ki 13 feeds into is no niche. The global e-fuels market stands at $24.49bn in 2025 and is projected to reach $66.25bn by 2030, a 22.0% CAGR (MarketsandMarkets, July 2025). Europe wrote much of that demand into law itself: ReFuelEU Aviation requires 2% sustainable aviation fuel at EU airports from 2025, rising to 6% in 2030. The market is not waiting to be discovered; it is mandated.

For scale, our fundraising data puts this week’s European seeds in context: Valencia’s iPremom raised a €15M seed for pregnancy diagnostics days earlier, while in the same energy neighbourhood, Norway’s Photoncycle picked up €15M for seasonal hydrogen storage in March. A $5M seed is a modest cheque against a mandated market growing at 22% a year – which is rather the point. If the energy numbers hold at industrial scale, the next round prices itself.

Private cheques, public match: how UK molecule startups get built

The construction of this round is as instructive as its size. A returning lead from the pre-seed, four private co-investors, and Innovate UK matching on top – the same blended architecture we keep seeing in UK deeptech, where the state de-risks the science and private capital buys the upside. It is easy to grumble that Europe leans on grants where the US leans on megafunds. The good news is the model works for exactly this kind of company: capital-hungry, physics-heavy, too early for infrastructure funds.

London has produced an unusual run of these stories lately – last week it was a $220M raise to fix American medical imaging; this week it is crop residues turned into jet fuel feedstock. Different sectors, same pattern: deep technical teams, early state support, patient private leads.

What to watch now is singular: the pilot plant. Feedstock costs decide who wins in e-fuels, and Ki 13 has planted its flag on being the cheapest source of both molecules. Imagine if a London reactor set the floor price for Europe’s mandated fuel transition – that is the bet HICO and Innovate UK just co-signed. The pilot will tell us. Let’s watch it get built.