Top 52 Green Energy startups in London
Feb 18, 2026
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16
1
Funding: $91.9M
tem is developing RED - an AI platform for the energy market that helps companies purchase clean, renewable energy directly from producers, reducing dependence on wholesalers and energy brokers and transforming the way electricity is purchased and sold. This platform is the transaction layer that underlies how energy is priced and settled. Companies that use half-hourly meter and can switch supplier - are ready to connect to RED and start saving up to 30%. tem also helps generating companies earn more through transparent pricing, fast quotes and reliable, timely payments. To date, the company has processed over 2 TWh of energy transactions in the UK.
tem is developing RED - an AI platform for the energy market that helps companies purchase clean, renewable energy directly from producers, reducing dependence on wholesalers and energy brokers and transforming the way electricity is purchased and sold. This platform is the transaction layer that underlies how energy is priced and settled. Companies that use half-hourly meter and can switch supplier - are ready to connect to RED and start saving up to 30%. tem also helps generating companies earn more through transparent pricing, fast quotes and reliable, timely payments. To date, the company has processed over 2 TWh of energy transactions in the UK.
2
Funding: $2.9B
Octopus Energy develops cloud-based smart grid platform and provides fair prices forever and greener energy from the UK's largest investor in solar generation. It uses an innovative AI and data-based platform to balance loads around the grid.
Octopus Energy develops cloud-based smart grid platform and provides fair prices forever and greener energy from the UK's largest investor in solar generation. It uses an innovative AI and data-based platform to balance loads around the grid.
3
Funding: $2.9B
Zenobe Energy manufactures battery energy storage systems. It provides comprehensive solutions for the electrification of fleets (buses, trucks and school transportation), including charging infrastructure, battery replacement and fleet management software. End-of-life vehicle batteries are given a second life in static battery systems. The company designs, finances, builds and operates large-scale battery storage systems, including Europe's largest 300 MW battery storage facility in Blackhillock, Scotland. Zenobe also supplies portable industrial BESS solutions powered by reconditioned batteries for construction sites and remote facilities.
Zenobe Energy manufactures battery energy storage systems. It provides comprehensive solutions for the electrification of fleets (buses, trucks and school transportation), including charging infrastructure, battery replacement and fleet management software. End-of-life vehicle batteries are given a second life in static battery systems. The company designs, finances, builds and operates large-scale battery storage systems, including Europe's largest 300 MW battery storage facility in Blackhillock, Scotland. Zenobe also supplies portable industrial BESS solutions powered by reconditioned batteries for construction sites and remote facilities.
4
Funding: $1B
Kraken is a spinoff of Octopus Energy, a company building a virtual grid for renewable energy supply. Kraken is the AI software that manages this grid, and Octopus has decided to sell it separately to other energy utilities. Kraken provides a suite of tools for managing the grid and customer base, forecasting load and income, organizing support and creating new products and tariffs. It also enables field operations management, including collaboration with local contractors, real-time network data retrieval to monitor performance, identify faults and allows to precisely manage capacity loads arising from the expansion of distributed energy sources. Kraken supplies its energy software to such utility companies as EDF and E.ON.
Kraken is a spinoff of Octopus Energy, a company building a virtual grid for renewable energy supply. Kraken is the AI software that manages this grid, and Octopus has decided to sell it separately to other energy utilities. Kraken provides a suite of tools for managing the grid and customer base, forecasting load and income, organizing support and creating new products and tariffs. It also enables field operations management, including collaboration with local contractors, real-time network data retrieval to monitor performance, identify faults and allows to precisely manage capacity loads arising from the expansion of distributed energy sources. Kraken supplies its energy software to such utility companies as EDF and E.ON.
5
Funding: $979.5M
Arrival is a technology company, that creates Generation 2 Electric Vehicles. Devices on wheels — they outperform legacy technology to deliver an experience like no other, but are priced the same as fossil fuel equivalents.
Arrival is a technology company, that creates Generation 2 Electric Vehicles. Devices on wheels — they outperform legacy technology to deliver an experience like no other, but are priced the same as fossil fuel equivalents.
6
Funding: $677.1M
Newcleo develops small modular reactors (SMRs) that uses MOX fuel technology to reprocess spent uranium from conventional nuclear power plants. The 200 MW reactor uses lead as a coolant. This is an ultra-compact module with improved energy density compared to other technologies. MOX fuel, which stands for Mixed Pu-U Oxides consists of depleted uranium (a byproduct of the enrichment process in modern reactors) and plutonium (which is extracted from spent nuclear fuel). The company intends to use already available nuclear material in France in synergy with the in-country environment. Newcleo plans to install the first 30 MW lead-cooled fast reactor (LFR-AS-30) in Savigny-en-Véron and Beaumont-en-Véron.
Newcleo develops small modular reactors (SMRs) that uses MOX fuel technology to reprocess spent uranium from conventional nuclear power plants. The 200 MW reactor uses lead as a coolant. This is an ultra-compact module with improved energy density compared to other technologies. MOX fuel, which stands for Mixed Pu-U Oxides consists of depleted uranium (a byproduct of the enrichment process in modern reactors) and plutonium (which is extracted from spent nuclear fuel). The company intends to use already available nuclear material in France in synergy with the in-country environment. Newcleo plans to install the first 30 MW lead-cooled fast reactor (LFR-AS-30) in Savigny-en-Véron and Beaumont-en-Véron.
8
Funding: $445.5M
Highview Power’s CRYOBattery delivers, clean, reliable, and cost-efficient long-duration energy storage to enable a 100% renewable energy future. It is storing energy in “liquid air”—when you compress a gas enough, it turns liquid
Highview Power’s CRYOBattery delivers, clean, reliable, and cost-efficient long-duration energy storage to enable a 100% renewable energy future. It is storing energy in “liquid air”—when you compress a gas enough, it turns liquid
9
Funding: £287M
Field is a renewable energy company aiming to accelerate the build-out of renewable infrastructure needed to reach net zero. It is building battery storage projects across the UK
Field is a renewable energy company aiming to accelerate the build-out of renewable infrastructure needed to reach net zero. It is building battery storage projects across the UK
10
Funding: £200M
Deep Green has developed a “digital boiler” technology to use the heat produced by data centers for swimming pools, apartment blocks, distilleries, laundrettes, and bakeries.
Deep Green has developed a “digital boiler” technology to use the heat produced by data centers for swimming pools, apartment blocks, distilleries, laundrettes, and bakeries.
11
Funding: $215M
BBOXX designs, manufactures, and distributes plug and play solar systems. It also offers pay-as-you-go solar power. BBOXX Power DC product range is closed DC systems in standardised sizes. BBOXX Hub brings the smart capabilities of remote monitoring and control to larger capacity systems and projects. BBOXX Pulse is a comprehensive management platform that enables growth of next generation utility businesses.
BBOXX designs, manufactures, and distributes plug and play solar systems. It also offers pay-as-you-go solar power. BBOXX Power DC product range is closed DC systems in standardised sizes. BBOXX Hub brings the smart capabilities of remote monitoring and control to larger capacity systems and projects. BBOXX Pulse is a comprehensive management platform that enables growth of next generation utility businesses.
12
Funding: £124M
Plastic Energy offers a sustainable solution to help prevent plastic pollution by transforming previously unrecyclable plastic waste into and optimal feedstock for making clean recycled plastics or alternative law-carbon fuels.
Plastic Energy offers a sustainable solution to help prevent plastic pollution by transforming previously unrecyclable plastic waste into and optimal feedstock for making clean recycled plastics or alternative law-carbon fuels.
13
Funding: $100.7M
Fuse Energy offers commission-free energy; 10x cheaper; 10x better, and 100 per cent renewable energy.
Fuse Energy offers commission-free energy; 10x cheaper; 10x better, and 100 per cent renewable energy.
14
Funding: £70M
Domna provides retrofit assessment software that predicts works programme, maximising energy efficiency services to housing properties.
Domna provides retrofit assessment software that predicts works programme, maximising energy efficiency services to housing properties.
15
Funding: $87.8M
Ev.energy is a smart charging software platform for electric vehicles to reduce carbon emissions and costs.
Ev.energy is a smart charging software platform for electric vehicles to reduce carbon emissions and costs.
16
Funding: $73M
Addionics is creating next-generation batteries for electric cars through intelligent 3D battery architecture and engineering.
Addionics is creating next-generation batteries for electric cars through intelligent 3D battery architecture and engineering.
17
Funding: $57.8M
Bramble Energy is an innovator energy technology company that designs and manufactures high-performance, low-cost, and fuel cell stack
Bramble Energy is an innovator energy technology company that designs and manufactures high-performance, low-cost, and fuel cell stack
18
Funding: $46.1M
Moixa is the UK’s leading smart battery company. We develop our Smart Battery hardware and GridShare software to facilitate smart energy storage and sharing.
Moixa is the UK’s leading smart battery company. We develop our Smart Battery hardware and GridShare software to facilitate smart energy storage and sharing.
19
Funding: £35M
Exagen Group is building the next generation of utility scale solar farms co-located with grid-balancing battery storage facilities.
Exagen Group is building the next generation of utility scale solar farms co-located with grid-balancing battery storage facilities.
20
Funding: $33M
Breathe Battery Technologies is a developer of electric vehicle battery charging control software for automotive manufacturers.
Breathe Battery Technologies is a developer of electric vehicle battery charging control software for automotive manufacturers.
21
Funding: £15.9M
Piclo develops software to make electricity grids smart, flexible and sustainable.
Piclo develops software to make electricity grids smart, flexible and sustainable.
22
Funding: £14M
ReEnergise developed High-Density Hydro technology to create pumped hydro energy storage systems that can be located in low-lying, hilly terrain, eliminating the need for high, steep slopes. The HD Hydro system uses a dense, mineral-rich liquid instead of water to reduce the system's size while delivering the same performance as a much larger system using regular water. The liquid recirculates through a pipeline between the upper and lower reservoirs. The compact size of the HD Hydro system allows for burying one or both reservoirs underground, preserving the land above for other uses. With an eight-hour operating cycle, this high-density hydropower system is half the cost of a lithium-ion battery system, without the risk of fire or environmental concerns. The company has already implemented a pilot project at Cornwood, a kaolin mine in the UK.
ReEnergise developed High-Density Hydro technology to create pumped hydro energy storage systems that can be located in low-lying, hilly terrain, eliminating the need for high, steep slopes. The HD Hydro system uses a dense, mineral-rich liquid instead of water to reduce the system's size while delivering the same performance as a much larger system using regular water. The liquid recirculates through a pipeline between the upper and lower reservoirs. The compact size of the HD Hydro system allows for burying one or both reservoirs underground, preserving the land above for other uses. With an eight-hour operating cycle, this high-density hydropower system is half the cost of a lithium-ion battery system, without the risk of fire or environmental concerns. The company has already implemented a pilot project at Cornwood, a kaolin mine in the UK.
23
Funding: $17.5M
Volteras collects, standardizes, and optimizes data from hundreds of energy devices into a single data model.
Volteras collects, standardizes, and optimizes data from hundreds of energy devices into a single data model.
24
Funding: $16.9M
Verv is an intelligent home hub, which gives the power to take control of energy usage to ultimately reduce energy bills.
Verv is an intelligent home hub, which gives the power to take control of energy usage to ultimately reduce energy bills.
25
Funding: £12.8M
AssetCool produces photonic coatings and materials that enhance the functionality of electrical networks.
AssetCool produces photonic coatings and materials that enhance the functionality of electrical networks.
26
Funding: £11M
Electron is a start-up harnessing blockchain technologies to design more efficient, resilient and flexible systems for the energy sector.
Electron is a start-up harnessing blockchain technologies to design more efficient, resilient and flexible systems for the energy sector.
27
Funding: £9.2M
WASE provides a decentralized sanitation system with the goal of accelerating the global adoption of circular waste treatment.
WASE provides a decentralized sanitation system with the goal of accelerating the global adoption of circular waste treatment.
29
Funding: $10.6M
Axle's software dynamically gives flexibility to the electricity grid and adjusts energy usage to when it is cheapest and greenest. Axle’s API enables energy suppliers and hardware manufacturers to monetise the flexibility of home energy devices, lowering costs and emissions while improving grid stability.
Axle's software dynamically gives flexibility to the electricity grid and adjusts energy usage to when it is cheapest and greenest. Axle’s API enables energy suppliers and hardware manufacturers to monetise the flexibility of home energy devices, lowering costs and emissions while improving grid stability.
30
Funding: $10M
Vaire is an unconventional computation company that offers technology services.
Vaire is an unconventional computation company that offers technology services.
31
Funding: $10.3M
Powervault has developed the UK’s most affordable and easiest to install home energy storage device, which can lower consumer electricity bills and provide emergency power to critical devices. The ‘emergency power socket’ enables customers to use their stored energy during black-outs. Founded by Joe Warren, the patent-pending product uses an integrated battery and control system to store the free electricity generated from solar panels during the day and then release the stored energy in the evening.
Powervault has developed the UK’s most affordable and easiest to install home energy storage device, which can lower consumer electricity bills and provide emergency power to critical devices. The ‘emergency power socket’ enables customers to use their stored energy during black-outs. Founded by Joe Warren, the patent-pending product uses an integrated battery and control system to store the free electricity generated from solar panels during the day and then release the stored energy in the evening.
32
Funding: £6.6M
Nous is hoping to throw households a life-raft by offering a free personalized report that explains how price rises will affect their costs and gives advice on how to adapt to inflation.
Nous is hoping to throw households a life-raft by offering a free personalized report that explains how price rises will affect their costs and gives advice on how to adapt to inflation.
33
Funding: $4.5M
Barocal is a Zero-carbon refrigeration. Barocal's breakthrough solid refrigerants deliver unprecedented efficiency and are inexpensive and safe for people and the planet - a true paradigm shift
Barocal is a Zero-carbon refrigeration. Barocal's breakthrough solid refrigerants deliver unprecedented efficiency and are inexpensive and safe for people and the planet - a true paradigm shift
34
Funding: $4.3M
AI driven SaaS platform for smarter mobility emission management for fleet owners, operators and customers.
AI driven SaaS platform for smarter mobility emission management for fleet owners, operators and customers.
35
Funding: $3.9M
AI powered Enterprise Net Zero Intelligence Platform - Helping enterprises to digitize and accelerate their net zero journey
AI powered Enterprise Net Zero Intelligence Platform - Helping enterprises to digitize and accelerate their net zero journey
36
Funding: £2.3M
Andersen develops and installs EV charge points that use industrial-grade electronics to match stunning design with enhanced performance and functionality.
Andersen develops and installs EV charge points that use industrial-grade electronics to match stunning design with enhanced performance and functionality.
37
Funding: $2.1M
SEaB Energy manufactures compact, easy-to-install, turnkey Anaerobic Digestion (AD) systems in shipping containers that turn organic waste into energy exactly at the point where the waste is produced and the energy is required.
SEaB Energy manufactures compact, easy-to-install, turnkey Anaerobic Digestion (AD) systems in shipping containers that turn organic waste into energy exactly at the point where the waste is produced and the energy is required.
38
Industrial Power Response develops energy storage systems for intensive applications. Its proprietary energy storage technology is designed for electrifying industrial equipment and the needs of the modern grid.
39
Funding: $1.4M
SMPnet is developing software to control power grids using AI. Its software is used by providers offering energy services, utilities, and microgrid services.
SMPnet is developing software to control power grids using AI. Its software is used by providers offering energy services, utilities, and microgrid services.
40
Funding: $1.1M
Ki Hydrogen is a deep-tech venture that develops waste-to-hydrogen technology.
Ki Hydrogen is a deep-tech venture that develops waste-to-hydrogen technology.
41
Supercritical Solutions is developing the world's most efficient electrolyser for hydrogen production
42
Neurons Lab uses AI to maximize energy output in energy stations, optimize vessels' engines.
43
Funding: $754.3K
Open Climate Fix is aiming to build an online solar electricity forecasting service
Open Climate Fix is aiming to build an online solar electricity forecasting service
44
Funding: £561.3K
Rebel Energy is a new breed of energy supplier, providing clean energy to households in the UK
Rebel Energy is a new breed of energy supplier, providing clean energy to households in the UK
45
Funding: €570K
Switchd is enabling consumers to easily switch energy suppliers through a platform that automatically subscribes them to the most advantageous solution. During the cost of living crisis, the startup hopes to make it easier for consumers to find and transfer to the most sustainable solutions for their homes.
Switchd is enabling consumers to easily switch energy suppliers through a platform that automatically subscribes them to the most advantageous solution. During the cost of living crisis, the startup hopes to make it easier for consumers to find and transfer to the most sustainable solutions for their homes.
46
Funding: $419.8K
AEROPOWDER is creating novel materials from surplus feathers. It developed world's first thermal packaging material made from surplus feathers.
AEROPOWDER is creating novel materials from surplus feathers. It developed world's first thermal packaging material made from surplus feathers.
47
Funding: $142.9K
Energy Shift is a web based, blockchain powered platform that enables citizens to jointly invest in and co-own solar farms.
Energy Shift is a web based, blockchain powered platform that enables citizens to jointly invest in and co-own solar farms.
48
Funding: $100K
Aed Energy is developing transformative longer-duration energy storage technology.
Aed Energy is developing transformative longer-duration energy storage technology.
49
Global OTEC designs floating platforms capable of converting solar heat energy stored in the oceans into renewable baseload power.
50
Nevana Designs produces cutting edge, light responsive coatings and compounds for environmentally sustainable, self-sufficient energy saving solutions.
