This year, we’re kicking off London Climate Action Week with a day built for the people pushing climate tech forward. The focus will be on the companies and technologies that have deep scientific or engineering research at the core.
Cleantech Venture Day (CVD) started in London, which remains the flagship of the series.
It now runs across London, Paris and Amsterdam as part of the Climate Tech SuperCluster, the ecosystem connecting some of the most active climate tech communities in the UK and Europe. What began as a single event has grown into something the region was missing — a shared stage for the founders, investors and others who are actually moving the needle on climate.
Each year we bring together a carefully selected group of pitching companies alongside the investors, corporates and partners drawn from across the network. The format is intentionally focused — this isn't a big conference, and that's the point. The people in the room are there because they want to be, and the conversations that happen on the day have a habit of turning into something real.
Carol Jenkins, Deputy Director for Net Zero Innovation Policy at Department for Energy Security and Net Zero (DESNZ)
Sarah Chapman, Venture Partner, SET Ventures
Sam Goodall, Co-founder, Climate Tech SuperCluster
Chaired by Patrick Molyneux, Partner and Head of Venture Fundraising Advisory, KPMG
PITCHING STARTUPS
Pre-seed
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![Kalz]()
Pre-seed | Germany
Kalz uses carbon mineralisation to capture CO₂ from industrial emissions and permanently store it in concrete, turning cement's carbon footprint into a scalable, cost-effective building material. -
![Astracite]()
Pre-seed | Belgium
Astracite is developing a high-performance anode material for lithium-ion batteries made from captured CO₂ and recycled batteries, offering a sustainable, European-made alternative to mined graphite with over five times the capacity. -
![Cooled Motors]()
Pre-seed | United Kingdom
Cooled Motors has invented CoolShaft and CoolDisc, a water-based rotor and stator cooling system for electric motors that unlocks over 50% more continuous power, enabling motors to be built smaller, lighter and cheaper without a clean-sheet redesign. -
![Segura]()
Pre-seed | United Kingdom
Segura is developing portable, accurate and affordable water quality testing technology to expand access to safe drinking water, replacing the expensive and cumbersome equipment that current testing regimes depend on. -
![VaprTech]()
Pre-seed | United Kingdom
VaprTech retrofits a control layer onto data-centre cooling systems, reconstructs live server-room heat maps, and autonomously adjusts cooling to cut electricity use by up to 30%.
Seed
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![Gardin]()
Seed | United Kingdom
Gardin builds optical sensors and an AI platform that measure crop photosynthesis in real time, giving greenhouse and indoor farm growers early insight into plant health to increase yields, reduce energy use and cut waste. -
![Exora]()
Seed | France
Exora uses patented adsorption technology to turn waste heat from industrial processes and data centres into cooling, cutting electricity consumption by up to 90% compared to conventional compression chillers. -
![Pysaf]()
Seed | United Kingdom
PySAF is building a biomass biocrude platform that converts low-value biomass residues into refinery-ready feedstock for sustainable aviation fuel and marine fuels. -
![Cosysense]()
Seed | United Kingdom
Cosysense uses plug-and-play sensors and AI to make commercial building HVAC systems smarter, cutting energy costs and emissions by up to 15% while improving occupant comfort, with no upfront cost. -
![Atmosfuture]()
Seed | United Kingdom
Atmosfuture uses a novel cryogenic process to convert waste heat from data centres into clean, continuous baseload power while capturing CO₂ as a byproduct. -
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Seed | United Kingdom
Efestos Hub develops AI-powered software that diagnoses the condition of reclaimed structural steel and matches available stock to design requirements, enabling architects and engineers to specify reused steel in new builds and cut embodied carbon from construction. -
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Seed | United Kingdom
Katrick Technologies has developed a patented honeycomb-shaped wind panel that uses mechanical oscillations rather than rotation to capture turbulent ground-level winds in urban and rural settings, generating carbon-free electricity from locations where traditional turbines cannot operate.
Series A & Series B
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![Eden]()
Series B | United Kingdom
Eden Geothermal is pioneering deep geothermal energy in the UK, operating the country's first deep geothermal heating system in over 30 years at the Eden Project in Cornwall, and now supporting others to develop geothermal projects from concept to completion. -
![Sirona]()
Series A | Belgium
Sirona Technologies builds modular direct air capture machines designed for speed, scalability and low capex, with its first commercial projects underway in Kenya and Oman to permanently remove and store CO₂. -
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Series A | Norway
Cartesian builds modular thermal energy storage systems using phase change materials that charge with heat or cold when electricity is cheap and release it when demand peaks, cutting energy consumption and costs in commercial buildings and district heating and cooling networks. -
![Naturbeads]()
Series B | United Kingdom
Naturbeads turns cellulose into perfectly spherical, fully biodegradable microspheres that replace plastic microbeads across cosmetics, coatings, industrial and life science applications, with its first production plant now operational in Italy. -
![Nanopower]()
Series A | Norway
Nanopower Semiconductor has developed nPZero, a subthreshold integrated circuit that cuts power consumption in battery-powered IoT devices by up to 90%, dramatically extending battery life and reducing the environmental cost of large-scale sensor networks. -
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Series A | Denmark
Floating Power Plant develops hybrid offshore platforms that combine wind and wave energy on a single floating structure, with integrated hydrogen production and storage for off-grid and weak-grid applications.
Meet the speakers
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Carolyn Hicks
Co-founder & COO/CFO
Brill Power -
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Nigel Topping
Chair
Climate Change Committee -
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Claire Curry
Global Head of Technology, Industry & Innovation
BloombergNEF -
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Patrick Molyneux
Partner & Head of Venture Fundraising Advisory
KPMG in the UK -
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Sarah Chapman
Venture Partner
SET Ventures -
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David Ferguson
Head of Innovation
EDF (UK) -
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Carol Jenkins
Deputy Director for Net Zero Innovation Policy
Department for Energy Security and Net Zero (DESNZ) -
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Wafa Jafri
Partner, UK Head of Energy Strategy & Global Lead for Energy Transition
KPMG in the UK -
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Joe Faulkner
Cambridge Office Senior Partner
KPMG in the UK -
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Sylvie Russell
COO
Cambridge Cleantech
We're looking for companies working on the hard problems.
That means founders building in areas like energy systems and grid infrastructure, industrial decarbonisation, advanced materials, thermal management and resource efficiency. That said, climate tech is moving fast and sometimes the most interesting companies don't fit neatly into a category. But if your technology has genuine technical depth and a credible path to real-world impact, we want to hear from you.
*Applications are now closed, and we’re looking forward to experiencing all of the selected companies.
Pitching at CVD*
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You're early, but the technical foundation is there. We're looking for founders who have a clear sense of the problem they're solving, early evidence that their approach works, and the conviction to see it through. The right introduction at this stage can genuinely change the trajectory of a company.
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You've proven the core technology works and you're starting to build commercial momentum. We're looking for companies that have moved beyond the lab, with early customer or partner traction and a clear case for why now is the moment to scale.
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You know what you're building, you know who it's for, and you have the numbers to back it up. We're looking for founders ready to make a compelling case for significant growth capital and a credible path to scale.
“Cleantech Venture Day was a great opportunity for Nanoplume. We connected with a global specialty chemicals company focused on advanced materials, which has since led to ongoing discussions, a potential joint development agreement, and engagement with their corporate venture arm. A very valuable outcome for us.”
Theresa Hoffmann
Co-founder & CEO, Nanoplume
More than just a map
This isn’t just a nice idea on a map. It’s already one of the world’s most powerful climate tech ecosystems.
What you’re looking at is a collection of some of the world’s most prolific climate tech clusters. What’s special is that they’re all reachable within four hours by train from London.
Within this region, you’ll find a critical mass of world-leading universities, ambitious climate investors, deep tech hubs, and some of Europe’s most forward-thinking cities: Cambridge, Paris, Cologne, Amsterdam, Antwerp, London, Eindhoven, Charleroi, Oxford. The list goes on.
We don’t believe the world needs another isolated innovation district or local hub. What it does need is a joined-up ecosystem that moves at the speed of the climate crisis.
An ecosystem where founders, researchers, investors, corporates, and governments collaborate across borders to scale solutions that work.
This is the ecosystem we’re building. We call it the Climate Tech SuperCluster.
Getting there
We’re proud to be hosting this year’s event at KPMG’s beautiful offices in London.
KPMG Canary Wharf
15 Canada Square
Canary Wharf Estate
London E14 5GL