From floating solar platforms to self-healing concrete and zero emission delivery: meet the companies with game-changing solutions to address the climate emergency

October 18, 2021

Cambridge Cleantech is delighted to announce the final shortlist for its high-profile investment event Cleantech Venture Day, which will take place online on 21 October 2021. With COP26 just around the corner, there has never been a more crucial time to support climate-positive technologies and Cleantech Venture Day offers investors the opportunity to meet some of the most game-changing companies in the sector.

“Ever since Cambridge Cleantech started running Cleantech Venture Days in the UK, I have been captivated by the quality of the investment-ready and innovative companies that apply each year. The 23 companies pitching this time represent the top of the class in in sectors ranging from clean energy and circular economy to transport and smart buildings, presenting a fantastic commercial opportunity for sustainability-focused investors,” says Martin Garratt, CEO of Cambridge Cleantech.

Meet the companies that made the cut out of over a hundred applications:

Circular Economy

Bio-Sep Limited Converts by-products of forestry operations into sugars, cellulose and lignin
Circla E-commerce platform with a unique closed-loop reuse and refill packaging system
Low Sulphur Fuels Ltd Converts hydrocarbon into useful by-products for biofuels and specialty chemicals
PuriFire Labs Convert waste into value-added products such as animal feed, biofuel, and biochar
Radiant Matter Replace petrochemicals used in textiles with naturally degradable materials

Smart Buildings

ISCLEANAIR Air Pollution Abatement (APA) technology
Kubos Semiconductors Material technology to improve LED performance
Mimicrete Ltd Developing self-healing concrete
R8tech AI-based software to increase the property’s energy efficiency
Zicon Limited High quality, low carbon materials


Geyser Batteries Oy Batteries based on water-based electrolyte
Global OTEC Floating platform that converts solar energy into power
Hope Resources Ltd Converts carbon based waste into Syngas
Hydrologiq Hydrogen generator procurement, planning and management platform
Ripple Energy Clean energy ownership platform
Focal Sun Decentralised hydrogen production via solar-to-hydrogen work
Solaris Photonics Solar Energy Technology
SpinDrive Active magnetic bearings
STAG-Tech Clean electricity for emerging markets
Zaphiro Helps integrate clean energy in the grid


Steamology Zero emission diesel engine replacement
Sunswap Battery and solar powered refrigeration units
Zedify Zero emission delivery operators

“I am always excited to see the range of new businesses that apply for Cleantech Venture Day, and proud to see quite a few familiar ones participating! Allia and Cambridge Cleantech work closely on the crucial agenda to bring new solutions to the climate crisis, and events like these are rare glimpses into a potential clean, green future,” said Emma Mee, Programme Manager at Allia and one of the judges at Cleantech Venture Day.

Previous companies that have pitched and successfully raised investment include Airex, Cheeky Panda, Oxwash, 8Power and Echion Technologies. At our last edition in March, we facilitated over 60 one-to-one meetings with start-ups that were requested by investors, and many of these meetings led to successful outcomes for both parties. This is the fifth year running that Cambridge Cleantech is hosting Cleantech Venture Day in the UK.

Along with pitches from the start-ups, we will be hearing from keynote speaker Dr Stephanie Hussels, Director of the Bettany Centre for Entrepreneurship. Dr. Hussels has a passion for early stage and growth companies and headed Cranfield University’s Business Growth Programme, the longest established owner-manager programme in the UK.

This event would not have been possible without the support of our partners Oxfordshire Greentech, Clean Growth UK, Business Isle of Man, J A Kemp, Granted, Allia Future Business Centre, Birketts, Consensus Business Group, KISS, Wallonia and GreenWin, Catax, Cheeky Panda, S-Tech, and Yangzhou Innovation Centre.

Investors who have registered for the event will be able to preschedule meetings with startups. Contact us at if you would like to book a session with one of the pitching companies.

Tickets are selling out quickly, interested can register here.