Top 50 Clean Energy Startup Investors in United Kingdom (October 2026)

Portfolio highlights

• Exergy3 — By converting renewable electricity from the grid into thermal energy, we supply high temperature, low carbon heat to power industrial processes.
• Caudal Energy — Porpoise Power develops a tidal energy system using oscillating hydrofoil technology inspired by dolphin swimming mechanics.
• Nuclear Turbine — Delivering advanced nuclear generation for markets where the cost of electricity is a growth constraint.

Portfolio highlights

• Excelya — Excelya is an R&D company that specializes in consulting, clinical trials, therapeutic research, data management, and medical writing.
• Proteor — Proteor offers a complete range of high quality products and services to the O&P world, through more than 60 clinics.
• Celcius Logistics Solutions — India's Largest 'ONLINE " cold chain network.Book reefer vehicles, Cold Storages or get booking for your vehicle and cold storages across India instantly with the best price

Portfolio highlights

• Alcolase — Alcolase is a danish startup who develops the world's first enzyme system breaking down alcohol in the stomach (before it enters the blood).
• FINDS — FINDS is a unique, video marketplace app for fashion. We are a female-led team that believes that an online fashion marketplace should be just as dynamic and inspiring as a thrift market IRL. We are on a mission to create a fashion resale community that offers a fun, interactive place for people who love to buy, sell & express their uniqueitems and style - together.It's simple to start selling. List your products in your shop, set a fixed price and choose to add them to a live stream to show your items from every angle. It's easy to buy, explore and discover items, styles, people and personalities you'll love.
• Interfaze — JigsawStack provides fine-tuned custom models that do the heavy lifting for APIs in every tech stack and helps ship faster.

Portfolio highlights

• K3 Metrology — K3 Metrology is a specialist metrology company commercialising laser‑based 3D coordinate measurement technology developed at the National Physical Laboratory. The company’s platform is designed to provide high‑accuracy, uncertainty‑aware dimensional data in large‑volume industrial environments, supporting inspection and assembly processes inadvanced manufacturing. Its systems integrate into production workflows where traceable measurements are required across complex geometries and large structures. The technology is applied in sectors such as aerospace, defence, and nuclear, where dimensional integrity and process control are critical.
• MoA Technology — We harness the principles of natural selection to accelerate discovery for better, safer herbicides so farmers can continue to feed the world.
• Quantum Motion — Quantum Motion delivers scalable silicon-based quantum computing using standard semiconductor manufacturing technology.

Portfolio highlights

• SolarSub — SolarSub is an environmental firm that offers floating solar cooling system.
• Anemo Labs — We develop highly selective polymer-based sensors to detect gas VOCs in the ppb range, in real-time. We combine custom hardware with Machine Learning to characterize smells
• INTELLIGENT MASS SPEC SOLUTIONS — Intelligent Mass Spec Solutions develops urine-based mass spectrometry and machine learning diagnostics for adrenal cancer.

Portfolio highlights

• Mykor — Mykor develops and scales the next generation of building insulation that considers both human and planet health using industrial residues and mycelium for a 100% circular product.
• Gigaton — Carbon Re is a climate tech company using cutting-edge AI solutions to decarbonize cement and steel. Get in touch with us today!
• Meatly — Good Dog Food creates cultivated meat for healthy pets and a healthy planet

Portfolio highlights

• Pāpr — At pāpr, we’re driving environmental sustainability through the reduction of paper usage in large enterprises. Our flagship product is the easiest, fastest and most inexpensive way to process documents that require signatures within your organization. Our long-term vision is to become the company businesses turn to when they want to go paperless.
• RISE Products — Upcycled Ingredients: healthy, sustainable source of protein and fiber. Made from Upcycled Grain, rich in fiber and protein, Hand Made & Stone Ground, Locally Sourced, Completely Natural
• Mandulis Energy — Mandulis Energy develops and operates renewable energy projects, with a focus on emerging markets.

Portfolio highlights

• CSignum — Revolutionising underwater communications with electromagnetic technology for seamless data integration between surface & submerged devices.
• Calterra — Calterra is an climate-tech firm that uses AI and satellite/drone data to monitor & verify carbon & biodiversity outcomes.
• SolarSub — SolarSub is an environmental firm that offers floating solar cooling system.

Portfolio highlights

• Sprive — Sprive is the free app that helps take years off your mortgage and save you thousands of pounds in interest.
• OneDome — Find, buy or sell property in one place with OneDome. Property search, mortgages, conveyancing and estate agents, we cover every step of the property journey.
• Airtasker — Access thousands of skilled people for your home & office tasks. From furniture assembly to data entry - hire a skilled Airtasker today.

Portfolio highlights

• ReEmerge — ReEmerge is a medical technology company that specializes in cognitive network restoration therapy.
• MCatalysis — Manufacturing drop-in liquid commodities from distributed hydrocarbon feedstocks below commodity cost with small modular refining.
• Beacon Therapeutics — Beacon aids in restoring and improving the vision of patients with ophthalmic gene therapy. Find out more.

Portfolio highlights

• AI Score — AI Score empowers organisations to harness AI safely
• Souk — Coco is an AI partnerships manager: she finds partners, activates them, and handles agreements, attribution and payouts.
• Stoa Corporation — Unlock perks when you save. Saving, reimagined - get high-value perks upfront, not small bank interest.

Portfolio highlights

• Pratexo — Pratexo is the intelligent edge computing and distributed cloud platform for industry 4.0 accelerating time to design, test, and provision.
• UptimeAI — Get precise answers for process anomalies with self-learning OEx solutions rooted in domain SME knowledge, alike the experts you know and trust.
• LandingAI — LandingAI is on a mission to make the world's documents computable. Agentic Document Extraction helps enterprise developers build document automation pipelines at scale. Accurate, auditable, API-driven document AI.

Portfolio highlights

• EPURON Pty Ltd — Epuron has been developing wind and solar energy projects in Australia since its formation in 2003.
• Renewable Metals — Renewable Metals' unique alkali recycling process recovers critical minerals from old batteries so they can be used again and again.
• Meridian Energy — Wind. Water. Sun - Proud to make electricity from natural resources and supply power to New Zealand homes, businesses and farms.

Portfolio highlights

• Sprive — Sprive is the free app that helps take years off your mortgage and save you thousands of pounds in interest.
• Merx — Grow contactability, data quality and customer lifetime value with AI agents on WhatsApp.
• Honest Mobile — It's time for mobile done right. Explore SIM-only plans that include bills that go down, support in seconds and a shrinking carbon footprint as standard. One of the UK's top-rated mobile networks.

Portfolio highlights

• Cosine — Buildt AI is generative AI to write iOS or Android native apps from some simple text requirements written by a customer - no code or technical information or experience required. This is not just a web app or a spreadsheet with a layer of UI. Buildt will automatically ‘write’ real code based on the simple requirements provided by the customer.Wealso interviewed technical executives/managers from companies such as Robinhood, Uber, and Cazoo and they were also extremely positive about using Buildt to build internal MVPs, product prototypes and quickly build their "CRUD" apps. Their existing experience with "no code" apps is that they are extremely limited to web apps only and can't satisfy their requirements accurately.
• VIZGARD — Vizgard - Visual AI to automate defence and security camera systems
• Prescient AI — Make every ad dollar count. Prescient AI gives growth teams the clarity to allocate budgets with confidence using cutting-edge marketing mix modeling.

Portfolio highlights

• Traini — All you need to train, socialize, and bond with your dog are now on one app.
• Boldr — Sustainability meets design. Save money and live more sustainably with Boldr products.

Portfolio highlights

• Hoora — Hoora is a mobile gaming platform that offers an instant, scrollable feed of over 200 casual and arcade mini-games playable without downloads or waiting.
• Shiplong — Shiplog creates live customer profiles to automate real-time decisions, helping SaaS teams expand, retain, and grow Net Revenue Retention.
• üma Laboratories — Laboratoires üma develops products targeting the physiological changes associated with perimenopause, menopause, and post-menopause.

Portfolio highlights

• AcouBatt — AcouBatt uses acoustic sensors and AI to monitor internal battery activity.
• Caudal Energy — Porpoise Power develops a tidal energy system using oscillating hydrofoil technology inspired by dolphin swimming mechanics.
• Quantum Diamonds — Bringing diamond-based quantum technology around the globe, empowering the next quantum leap.

Portfolio highlights

• Phase0 — Payment platform for construction projects
• Resolutiion — Resolutiion provides AI-powered software for managing commercial conflict, delivery risk, and business relationship performance. The platform supports organizations with dispute detection, workflow automation, contract monitoring, issue resolution, and operational risk management across customers, suppliers, workforce teams, and commercialpartnerships. Its system uses AI-driven analysis to identify relationship friction, monitor delivery performance, and support structured resolution processes. Resolutiion also provides commercial intelligence tools, reporting, and collaboration features for enterprise delivery and governance management.
• Maven Robotics — Maven Robotics is building the world's leading general purpose AI robots.

Portfolio highlights

• Biorce — Biorce is an innovating HealthAI startup committed to transforming drug development through the use of artificial intelligence.
• CEEZER — CEEZER is the digital infrastructure to give companies access to the complex voluntary carbon market. Deliver true climate impact now!
• Endra —

Portfolio highlights

• Equatic — Equatic uses a seawater electrolysis process that enhances the ocean's capacity to absorb and store significant quantities of carbon dioxide. The company designs, develops, commissions, co-owns, and co-operates carbon removal facilities globally, which use seawater electrolysis to extract atmospheric CO2.
• Exergy3 — By converting renewable electricity from the grid into thermal energy, we supply high temperature, low carbon heat to power industrial processes.
• CREW Carbon — CREW provides wastewater treatment facilities with a process intensification solution that improves performance, lowers costs, and permanently removes greenhouse gasses.

Portfolio highlights

• Aflore — Aflore is a financial services company empowering the un-banked of Colombia (65% of the population) to achieve financial goals. Aflore identifies and partners with trusted financial advisors within communities and mobilizes them with support and tools to distribute loans and financial products within their networks. The company was founded in2012 and is headquartered in Bogota, Colombia.
• Classcraft — HMH Classcraft pairs ELA and math content with research-based lesson plans resulting in reduced educator planning time and increased student engagement.
• Stones2Milestones — Our products are fREADom online live online English class and English reading app, Club1BR community, WOW programme, FAST assessment, MsMoochie Books and BICW Awards.

Portfolio highlights

• cheMastery — Echo handles repetitive tasks with accuracy and precision, allowing your chemists to tackle high-value challenges.
• Vosbor — Vosbor is a digital grain & oilseed trading platform providing a spot and forward market to reconcile trade data & securely share documents.
• Paddington Robotics — Paddington Robotics specializes in implementation of AI, robotics, software and hardware solutions in real life.

Portfolio highlights

• Observable Space — OurSky is a modern developer platform for space applications. We provide real-time observational data and analysis of objects and activities in space. Built as an open, community-driven resource for the new space age engineer.
• Integral Privacy Technologies — Real-world data, ready for AI.
• Something & Nothing — Our Premium Sodas are made with the highest quality natural juices, extracts and botanicals for elevated refreshment.

Portfolio highlights

• Juro — Juro is an all-in-one contract automation platform that helps legal and business users to agree & manage contracts in one unified workspace.
• Meatable — Meatable is a food production company that produces real and guilt-free meat. With one cell, they are revolutionizing the meat industry's impact on climate change and animal welfare. At the same time they increase food security, without compromising the culinary experience of eating tasty, real meat. They aim to satisfy the world'sappetite for meat without harming people, animals, and the planet.It was founded in 2018 and is headquartered in Delft, South Holland, The Netherlands.
• Skeleton Technologies — Skeleton Technologies is the global leader in ultracapacitor & supercapacitor energy storage and helps companies in automotive, transportation, grid, and industry to save energy.

Portfolio highlights

• Charlie — Charlie is built by serial startup founders to solve their most pressing need – more time. Designed so that it’s easy to use and simple to manage, Charlie automates the administrative headaches of running a company so you can focus on building real value.
• Odin — Community and investment tools for people building the future.
• Clim8 Invest — Clim8 Invest develops an app for sustainable investing so people can make an impact on climate change with their savings. Clim8 is a simple way to invest in a sustainable portfolio of carefully selected companies already making a positive impact on climate change.Clim8's mission is to move billions of pounds of investments into clean energyand truly green, sustainable companies.

Portfolio highlights

• Dognosis — unleashing canine superpowers to democratize early cancer detection join our waitlist - https://t.co/zcCjHsq10v
• Fundably — Fundably - Get The Right UK Business Loan | Access £1k-£2m
• VIAN Therapeutics — VIAN Therapeutics is an early-stage biotechnology company focused on transforming retinal disease treatment. With a first-in-class, non-invasive eyedrop as its lead product, VIAN aims to replace invasive injections for conditions like age-related macular degeneration (AMD) and diabetic macular edema (DME). Backed by strong preclinical data andongoing clinical testing, VIAN is positioned to address significant unmet medical needs and disrupt the $15 billion retinal disease market.

Portfolio highlights

• Fuuse — Fuuse is an electric vehicle charge point management system that enables your chargers to deliver more for you and your drivers.
• PathXL — Cirdan provides highly reliable, innovative LIS & imaging solutions for the acceleration & enhancement of diagnosis, optimized for pathology & clinical lab.
• Skylark Lasers — UniKLasers specialises in single frequency, continuous wave DPSS lasers at mid- to high power. Suitable for Raman, Holography, Interferometry, Microscopy, Metrology, Quantum Technologies, and more

Portfolio highlights

• CROSSIP — Great tasting non-alcoholic spirits with a kick. Made from natural botanical ingredients, no added sugar. 0% alcohol drinks perfected by TV's Carl Anthony Brown.
• Cellexcel — Cellexcel is a biomaterials research company that develops technology for enhancement of water resistance of biomaterials.
• One Planet Pizza — One Planet Pizza is a vegan food company, dedicated to creating good food. It distributes a range of frozen pizzas and redi-meals through local retail outlets and via home delivery in Norwich, Cambridge, and Ipswich. One Planet's pizza currently come in 4 Italian style pizza's and can be found in most of the major high streetsupermarkets.One Planet Pizza is owned by a group of vegan and veggie business people, including Mike Hill (co-owner of River Green Café), Jan Wise (owner of The Beggie Red Lion Pub) and Tanya Chapman (owner of Luvegan Cakes in Leicester). The company is also supported and backed by a number of vegan bloggers and activists.

Portfolio highlights

• Clim8 Invest — Clim8 Invest develops an app for sustainable investing so people can make an impact on climate change with their savings. Clim8 is a simple way to invest in a sustainable portfolio of carefully selected companies already making a positive impact on climate change.Clim8's mission is to move billions of pounds of investments into clean energyand truly green, sustainable companies.

Portfolio highlights

• Docbot Labs — Scattered and unfindable information is a productivity nightmare. dot puts an end to the chaos and helps you find, organise, and share resources with your team seamlessly.
• TheCarCrowd — TheCarCrowd is a UK-based “passion asset” investment platform for cars.
• SimpleStudy — Learn smarter with revision notes, past papers, quizzes, and expert tools for major Irish academic exams. Join SimpleStudy Ireland and boost your grades today.

Portfolio highlights

• Bio-Images Drug Delivery — BDD Pharma combine drug delivery expertise and clinical capabilities to accelerate product development pipelines, enable life cycle management and new innovative pharmaceutical products. Rapid parallel clinical testing with SWIFT significantly reduces time from product concept to clinical success.
• IOTech — Discover IOTech Systems. Deploy, manage, and scale AI-driven, data-rich industrial systems at the edge with our open edge data platform.
• Administrate — Manage instructor-led training with Administrate. Plan, schedule, communicate, resolve issues, and report on training operations from one platform.

Portfolio highlights

• 5Mins — 5Mins is the new microlearning platform that helps your employees build in-demand skills fast with AI-powered personalisation and advanced gamification.
• Screenloop — Screenloop is the hiring intelligence platform that allows you to source candidates, analyse interviews, and automate the reference process.
• Clim8 Invest — Clim8 Invest develops an app for sustainable investing so people can make an impact on climate change with their savings. Clim8 is a simple way to invest in a sustainable portfolio of carefully selected companies already making a positive impact on climate change.Clim8's mission is to move billions of pounds of investments into clean energyand truly green, sustainable companies.

Portfolio highlights

• GetAlert — GetAlert IoT smart Analytics enables camera sensors with intelligence to understand the world as humans do. GetAlert products are based on 3D human biometric & Gait analysis proprietary technology using any 2D sensor.
• Lumo Bodytech — Feel Peak is an online resource aimed at helping you to feel at your peak - both physically and mentally. Browse our reviews and guides to reach your potential.
• Eksagon Group Ltd — At Eksagon, we provide travelling exhibitions that inspire learning in a dynamic, engaging and entertaining manner; for children and adults alike.

Portfolio highlights

• Nuritas — Nuritas is revolutionising the discovery of novel, natural and scientifically proven active ingredients that can manage and improve human health. The company’s disruptive computational approach to discovery uses artificial intelligence and genomics to, for the first time ever, rapidly and efficiently predict and then provide access to the mosthealth-benefiting components hidden within food, called bioactive peptides.
• AeroFarms — AeroFarms is an award-winning vertical farming company solving agriculture's biggest challenges, specializing in nutrient-dense microgreens.
• The EVERY Company — The EVERY Company, Formerly Clara Foods making Protein | Animal-Free, Vegan Egg Protein Ingredients for Food and Beverage

Portfolio highlights

• amicable — amicable is the trusted legal service for divorcing and separating couples. Get help reaching an agreement or having your agreement documented in a consent order...
• FuroSystems — FuroSystems is an electric vehicle manufacturer that uses modern technologies to develop its products. Performance and affordability are the two main considerations in how FuroSystems develops its products. The company is a team of engineers, designers, and customer specialists.
• Ethical Angel — The Employee Engagement Engine with a Social Impact By-Product

Portfolio highlights

• EC-OG — Subsea energy storage and remote power generation for the energy transition, low carbon offshore operations and zero emission hydrocarbon production.

Portfolio highlights

• Clim8 Invest — Clim8 Invest develops an app for sustainable investing so people can make an impact on climate change with their savings. Clim8 is a simple way to invest in a sustainable portfolio of carefully selected companies already making a positive impact on climate change.Clim8's mission is to move billions of pounds of investments into clean energyand truly green, sustainable companies.

Portfolio highlights

• NavierAI — Navier turns a plain-language request and a geometry file into a meshed, solved, and reviewed simulation study, delivered as an inspectable engineering report. Fluids, structures, thermal, multibody, and electromagnetics. Forward-deployed engineers available for scoped engagements.
• Chiral — Next-generation electronics with nanomaterials
• Karavela — Karavela is a company developing a "foundation model" of the human brain using large-scale brain imaging data (like MRI) and AI.

Portfolio highlights

• Kenshō Health — Pharmacy Mall is a trusted online drugstore designed to make high-quality medications accessible and affordable for everyone.
• Wally Health — Unlimited dental cleanings and whitening for $199/year
• Growth Kitchen — Growth Kitchen provides a network of delivery-optimized kitchens coupled with food delivery solutions and support.

Portfolio highlights

• CSignum — Revolutionising underwater communications with electromagnetic technology for seamless data integration between surface & submerged devices.
• Returnal — Supercharge your sustainability journey with our buy-back tech. We invite you to own products through their 2nd and 3rd lifecycles through our buy-back model. Find out more today...
• Archangels — Established in 1992. Archangels is the oldest continuously operating business angel syndicate in the World. Investing in IP-rich tech & life sciences companies in Scotland, UK.

Portfolio highlights

• Agriloops — Agriloops is reinventing aquaculture to produce eco-friendly products that are healthier and tastier. To carry out this mission, the Agriloops team gives all its power to a sustainable and innovative production mode, by designing the first aquaponic farm in salt water.
• cosma — Cosma observes, maps and monitors the seabed to deliver open, neutral and affordable data at global scale.
• PierSight Space — PierSight builds application-specific SAR satellite and drone systems for persistent maritime surveillance, EEZ monitoring, IUU fishing detection, and defense reconnaissance.

Portfolio highlights

• Rappor — Rappor is a multidisciplinary consultancy specialising in acoustics, air quality, civil engineering, landscape design, transport planning and water environment
• Gaussion — Gaussion is revolutionising batteries by utilising magneto-electrochemistry.
• Everflow — Everflow are switching their water and sewerage services.

Portfolio highlights

• Vessev — Electric hydrofoiling vessels built for commercial use. Quiet, efficient, and better for the world.
• Heidi Health — Heidi Health is a healthtech company that develops an AI medical scribe platform that automates clinical documentation and related tasks.
• Gilmour Space Technologies — Gilmour Space is a rocket company in Australia that is developing and launching low-cost small satellite launch vehicles. All orbits, all planets: https://www.gspacetech.com

Portfolio highlights

• Seqana — Seqana provides the scientific foundation for measuring soil health with a focus on soil organic carbon (SOC). Our advanced, satellite-based solutions help clients navigate evolving standards and measure their SOC sequestration. We work with teams at every step of their journey to build scientifically robust MRV at scale, improving the resilience of soils globally.
• PyroCCS — PyroCCS is a vertically integrated industrial biochar and pyrolysis platform converting biomass into biochar, metallurgical biocarbon, activated carbon, bio-oil, and verified carbon removal credits.
• CREW Carbon — CREW provides wastewater treatment facilities with a process intensification solution that improves performance, lowers costs, and permanently removes greenhouse gasses.

Portfolio highlights

• Octaura — Octaura, an industry-led electronic trading, data and analytics solution for syndicated loans.
• Validis — We get financial data - We work with accounting firms and financial institutions to help them connect to their customers accounting packages.
• Adani New Industries — Adani New Industries specializes in green hydrogen initiatives and the production of wind turbines and solar modules. ANIL's scope of operations extends to the production of solar modules, batteries, and electrolyzers, along with related upstream manufacturing and supporting industries. The filing further states that the company will engage inall necessary activities related to these ventures. The company is a subsidiary of Adani Enterprises.

Portfolio highlights

• Future Fields — Future Fields Cellular Agriculture: Serum-Free Growth Media Supplements and Recombinant Proteins - Optimized for the Future of Food.
• Rodatherm Energy — A geothermal company that plumbs its boreholes with a closed loop
• Xona — Xona's Pulsar service is the first high-performance alternative to GPS designed to support the age of autonomy. Our constellation of smallsats will provide secure navigation and timing services with the resilience and accuracy needed to enable modern devices to operate safely in any conditions.

Portfolio highlights

• Claimer — Claimer is a self-service application that gets credit claims done easily of money spent on research and development. Its platform empowers company owners and advisors to prepare their claims, without any specialist knowledge, no matter how big or small the claim. It also prepares and submits the amended tax return for free.Claimer was founded in2019 by Adam McCann and is headquartered in Croydon, United Kingdom.
• Unitary — We detect harmful content with context-aware AI to keep brands and platforms safe online.
• Fabric — One home for your digital world. Your second brain. A file explorer and workspace for the internet age. All your drives, clouds, notes, screenshots, links, and files in one calm, minimal app. No organizing required. Never forget anything again.

Portfolio highlights

• Electron — Electron was founded on the belief that energy systems of the future would need digitally optimised marketplaces.
• Harbinger — Founded by veterans of Canoo and Faraday Future, Harbinger is an automotive company that develops EV platforms optimized for medium-duty trucks and delivery vans.
• Infinitum — Infinitum Electric is a motor technology company delivering lightweight and IoT-enabled electric motors. It is at the forefront of making electric motors more efficient, more durable, lighter weight, and less expensive. Their disruptive motor and control products utilize their patent-pending Printed Circuit Board (PCB) stator technology and providebroad application across multiple industries. They work with global manufacturers and industrial OEMs to customize their technology for specific applications and market segments.

Portfolio highlights

• Q-Bot — Q-Bot makes your home warmer by insulating suspended floors using a small robot. Stop draughts, improve your comfort and lower your energy bills.
• DName-iT — DName-iT is a genetic analysis tool that offers DNA-based barcode labeling technology and a software platform that can ensure reliable, cost-effective NGS specimen identification.
• Sofant Technologies — Sofant is developing a low cost RF MEMS technology that solves power consumption and heat problems in high frequency phased array antenna systems.