Cleantech Startups

Elephant Energy provides end-to-end home electrification services for homeowners, handling heat pump and heat pump water heater installation including sizing, contractors, rebates, inspections, and electrical work. The company operates in the residential climate and clean energy market, serving areas including Colorado, Boston, and Los Angeles in the US.

4 investors

Delta provides telecom power and infrastructure systems, including rectifiers, power cores, indoor/outdoor systems, DC distribution units, renewable and hybrid energy setups, converters, controllers, enclosures, lithium-ion batteries, and UPS. It serves telecom operators, network owners, and integrators across Europe, the Middle East, and Africa, supporting 5G base stations, central offices, and data centers.

4 investors

Ember operates an all-electric intercity bus service in Scotland, running routes between cities including Dundee, Aberdeen, Edinburgh, Glasgow, Oban, Fort William and Inverness with airport connections. It offers passengers features such as live bus tracking, low fares, flexible tickets, Wi-Fi, and wheelchair and bike spaces.

4 investors

Energy Impact Partners is an investment firm that connects entrepreneurs with large corporations to fund and support companies working on transforming the global economy toward decarbonization.

4 investors

Energy Vault designs and integrates energy storage products and management software for grid-scale and utility customers, spanning battery, gravity-based, and hydrogen storage systems. Its offerings support renewable energy integration, asset optimization, and long-term service for large storage projects.

4 investors

EnOcean develops energy-harvesting wireless technology that converts ambient energy into power, enabling battery-free devices and sensors for smart building automation. Its products support multiple wireless protocols including Bluetooth, Zigbee, and EnOcean, and integrate with IoT systems for more efficient, connected buildings.

4 investors

Erg Bio converts waste biomass into fermentable sugars and intermediates for synthetic aviation fuels and chemicals, using an advanced solvent process and a proprietary yeast that produces enzymes and ferments sugars. The technology is feedstock-agnostic and licensed from the DOE Joint BioEnergy Institute, targeting energy and chemical production markets.

4 investors

Estes Energy Solutions builds Magnus, a magnesium-alloy battery platform delivering 225 Wh/kg using commercially available lithium-ion cells, designed for transport sectors including rail, marine, aviation, and on/off-highway vehicles. The company designs and manufactures its advanced battery systems entirely in the United States.

4 investors

FabricNano develops cell-free biocatalysis technology that immobilizes engineered enzymes onto scalable, environmentally friendly support materials for use in bio-processes. It offers enzyme immobilization and interaction engineering services to help companies turn biocatalysis projects into commercially viable, scalable biocatalyst products.

4 investors

Feon develops high-performance battery electrolytes using a discovery platform (EDGE) to improve battery performance, safety, and cost across various battery chemistries. Its electrolytes support clean energy storage for applications including mobility and electronics.

4 investors

Rivy is a climate finance company providing inventory, asset, and micro-grid financing to expand access to clean energy in Nigeria. The company connects clean energy projects to carbon markets and has disbursed ₦45B in loans to support homes, businesses, and developers.

4 investors

FlexiDAO provides data, software, and advisory services for managing, trading, and reporting on renewable energy portfolios, helping customers assess climate-related risks and pursue carbon-aware procurement. It serves clients across Europe, the US, and the APAC region in the clean energy sector.

4 investors

FluoRok, a spin-out of the University of Oxford, develops patented fluorinating technologies to produce fluorochemicals such as Li-ion battery electrolytes, agrochemicals, and pharmaceutical ingredients without generating toxic hydrofluoric acid. The company aims to offer safer, cheaper, and more sustainable chemical production methods.

4 investors

Fusion Coolant Systems makes Pure-Cut, a machine-tool cooling and lubrication system that uses supercritical carbon dioxide instead of traditional cutting fluids to extend tool life, improve surface finish, and reduce health and environmental risks in CNC machining. It serves manufacturers, including the medical industry and other applications requiring clean, dry, precise machining.

4 investors

GHGSat monitors greenhouse gas emissions at the facility level using a dedicated satellite constellation and aircraft sensors, providing independent emissions data and analytics. Its customers include industrial operators seeking to protect revenue and improve asset performance, and governments developing climate and energy policy.

4 investors

Gridcog builds energy modelling and simulation software for teams delivering energy transition projects, letting them assess feasibility and value assets such as renewables, battery storage, EV charging, demand response and virtual power plants. It targets energy solution providers and delivery teams working on commercial and industrial sites including large energy users, real estate, logistics and fleet depots.

4 investors

Gridsight builds an AI-driven electrical digital twin and decision layer for electricity distribution networks, using data from AMI, GIS, SCADA, and distributed energy resources to model grid capacity. It serves utilities, helping them plan, connect customers, and manage dynamic operating limits, including powering Endeavour Energy's flexible solar export program in Australia.

4 investors

Group14 develops and manufactures SCC55, a patented silicon anode material for lithium-ion batteries, aimed at improving energy density and charge times. Its materials serve electric vehicles, grid-scale energy storage, consumer electronics, data center backup power, and electric aviation.

4 investors

Halion develops color-changing nanomaterials that enable reflective displays with full color and video capability, as well as color-changing plastics. The company targets applications in outdoor displays and other industrial uses.

4 investors

Hardt develops hyperloop technology as a sustainable transportation solution that aims to overcome distance barriers.

4 investors

Heliatek develops and manufactures HeliaSol, an IEC-certified organic photovoltaic solar film that is lightweight, flexible, and adheres to building surfaces and other structures without drilling. The company targets commercial building owners and solar-market partners seeking to add solar generation and reduce their carbon footprint, producing the films at its facility in Dresden, Germany.

4 investors

Heliogen develops concentrated solar power and molten salt thermal energy storage systems to deliver dispatchable low-carbon electricity, heat, and steam. It serves energy-intensive operations such as data centers, oil & gas, and minerals and processing facilities, offering services from technoeconomic analysis to industrial heat system design.

4 investors

HeyCharge provides hardware and software for companies to manage employee charging of company vehicles at home, with tax-compliant tracking and reimbursement capabilities across any OCPP-compatible wallbox.

4 investors

Hydregen develops biocatalysis platform technologies that integrate into existing chemical manufacturing infrastructure, aiming to cut process costs by 40-50% while lowering energy use and carbon emissions. It sells to chemical manufacturers, supporting UK and EU needs for secure critical chemical supply chains.

4 investors