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Top 54 Green Energy startups in London
Sep 09, 2025 | By Alexander Gillet | 16 |
1
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
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 is the largest independent owner and operator of battery storage in the UK. It buys and manages grid-scale batteries for its commercial customers, such as utilities and electric-vehicle operators.
Zenobe Energy is the largest independent owner and operator of battery storage in the UK. It buys and manages grid-scale batteries for its commercial customers, such as utilities and electric-vehicle operators.
4
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.
5
Funding: $677.1M
Newcleo is developing the latest generation of nuclear reactors providing a path to combatting both climate change and existing nuclear waste. It is working on so-called Small Modular Reactors (SMRs) and wants to use so-called MOX technology to make it possible to recycle spent uranium from conventional nuclear power plants.
Newcleo is developing the latest generation of nuclear reactors providing a path to combatting both climate change and existing nuclear waste. It is working on so-called Small Modular Reactors (SMRs) and wants to use so-called MOX technology to make it possible to recycle spent uranium from conventional nuclear power plants.
7
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
8
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
9
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.
10
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.
11
Funding: $168.2M
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.
12
Funding: $90.7M
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.
13
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.
14
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.
15
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.
16
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
17
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.
18
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.
19
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.
20
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.
