Top Energy Efficiency Startups in United Kingdom (2025 Update)
Explore the best Energy Efficiency companies in United Kingdom. Discover high-growth startups and investment opportunities in our 2025 updated list.
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Explore Top Energy Efficiency Startups in United Kingdom featuring 103 Companies
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Look After My Bills | - | UK's largest autoswitching service saving you money without you having to do a t... | Look After My Bills is the largest free energy auto-switching service in the cou... | - |
United Kingdom
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London | United Kingdom (HQ) | 2018 | Energy, Energy Efficiency | [email protected] |
1
Low
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6
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3.7K (-31%) | 6 years ago | Series A | 3 | 120.0K | 1728 | 4 years ago | |
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Hometree | - | Hometree enables sustainable, stress-free living in the home | Hometree is a home energy services company on a mission to accelerate the transi... | - |
United Kingdom
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London | United Kingdom (HQ) | 2015 | Energy Efficiency | [email protected] |
1
Low
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119
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44.7K (-11%) | 11 months ago | Debt Financing | 9 | 404.0M | 8601 | 5 months ago | |
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Dodo | - | Carbon accounting made easy and tailored to your needs. |
We make carbon accounting easy and tailored to your needs. A simple and intuiti... |
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United Kingdom
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London | United Kingdom (HQ) | 2020 | Sustainability, Energy Efficiency | [email protected] |
1
Low
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10
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428 (-44%) | 3 years ago | Pre Seed | 3 | 323.4K | 51098 | 5 RRq xo7 | |
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Octopus Energy | - | We're not your typical energy company. | We're on a mission to make a big green dent in the universe by building a truly... | - |
United Kingdom
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London | United Kingdom (HQ) | 2015 | Energy, Renewable Energy +1 | [email protected] |
1
Low
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3664
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10.8M (9%) | 1 year ago | Private Equity | 8 | 2.9B | 228203 | 5 months ago | |
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Tonik Energy | - | Energy for the switched on. |
Tonik Energy Limited – in Administration (“the Company”) Matthew James Cowlish... |
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United Kingdom
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Birmingham | United Kingdom (HQ) | 2015 | Energy, Renewable Energy +1 | [email protected] |
1
Low
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25
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466 | 6 years ago | Series A | 1 | 13.0M | 3592 | 10 ZLb QYo | |
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Brighter World Energy | Not active anymore | Brighter World: UK energy provider powering people in remote areas while saving... | By making the switch to Brighter World, not only will you save money on your ene... | - |
United Kingdom
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Manchester | United Kingdom (HQ) | 2016 | Energy, Energy Efficiency +1 | [email protected] |
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N/A
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309
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832 | 8 years ago | Seed | 1 | 500.0K | 7057 | 9 D0u WxJ | |
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Blue Ocean Seismic Servic... | - | Next-generation low cost and reduced carbon emission ocean bottom seismic acquis... | Our vision is to disrupt the marine seismic acquisition industry by using swarms... | - |
United Kingdom
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Farnborough | United Kingdom (HQ) | 2019 | Energy, Energy Efficiency +1 | [email protected] |
1
Low
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9
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94 | 4 years ago | Series A | 1 | 10.0M | 2450 | 1 year ago | |
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Advizzo | - | Helps Energy & Water companies use Behavioural & Data Science to optimize operat... | Advizzo transforms how millions of people think about their water and energy con... | - |
United Kingdom
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London | United Kingdom (HQ) | 2015 | AI, Analytics +6 | [email protected]/[email protected] |
1
Low
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14
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675 | 5 years ago | Series A | 5 | 2.4M | 1326 | 6 months ago | |
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Arloid Automation | - | the ultimate AI solution for energy saving (AI for real estate) |
We resolve energy inefficiency in real estate. Arloid Automation is a global l... |
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United Kingdom
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London | United Kingdom (HQ) + 4 | 2019 | AI, Energy +3 | [email protected] |
1
Low
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46
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123 | 4 years ago | Pre Seed | 4 | 2.6M | 20323 | 2 years ago | |
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Ogre AI | - | Leveraging machine learning to forecast energy | Ogre AI is an automated B2B platform which uses machine learning to offer financ... | - |
United Kingdom
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London | United Kingdom (HQ) + 1 | 2021 | AI, Big Data +5 | [email protected] |
1
Low
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12
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9.0K | 8 months ago | Series Unknown | 3 | 5.6M | 957 | 5 months ago | |
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-Ltd-logo.jpg "Chameleon Technology (UK) Ltd"){kind=logo}
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Chameleon Technology (UK)... | - | Providing real time energy data from smart meters and connected devices and appl... | Chameleon Technology is a leading smart energy technology company providing real... | - |
United Kingdom
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Harrogate | United Kingdom (HQ) + 1 | 2010 | Big Data, Consumer Electronics +5 | [email protected] |
1
Low
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39
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8.6K (115%) | 4 years ago | Undisclosed | 2 | 13.3M | 1652 | 5 months ago | |
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Limejump | - | Optimising a 100% renewable energy future | Limejump, UK’s award winning energy-tech platform, provides renewable generators... | - |
United Kingdom
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London | United Kingdom (HQ) | 2013 | Analytics, Big Data +2 | [email protected] |
1
Low
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7
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4.7K (31%) | 7 years ago | Grant | 3 | 4.4M | 13356 | 2 years ago | |
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Elyos | - | Elyos is an AI platform for the energy sector. | AI platform for the energy sector | - |
United Kingdom
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London | United Kingdom (HQ) | 2023 | Energy, Energy Efficiency | [email protected] |
1
Low
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11
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1.8K (-73%) | 1 year ago | Seed | 2 | 3.5M | 2017 | 5 months ago | |
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Elgin Energy | - | Leading in Solar+Storage | We are Elgin Energy, a fully integrated, utility-scale, solar+storage platform t... | - |
United Kingdom
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London | United Kingdom (HQ) + 2 | 2009 | Energy, Renewable Energy +1 | - |
1
Low
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144
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197 | 11 months ago | Debt Financing | 4 | 118.4M | 12149 | 9 months ago | |
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Iceotope Technologies Lim... | - | Precision Liquid Cooling | Iceotope is redefining the future of data center cooling with our cutting-edge P... | - |
United Kingdom
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Sheffield | United Kingdom (HQ) + 1 | 2005 | Sustainability, Energy Efficiency | [email protected] |
1
Low
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66
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9.6K (85%) | 2 years ago | Private Equity | 11 | 73.3M | 8615 | 6 months ago | |
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EcoSync | - | STOP HEATING EMPTY ROOMS! | EcoSync is a multi-award winning Smart Temperature Control System, born out of O... | - |
United Kingdom
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Oxford | United Kingdom (HQ) | 2018 | Computing, Energy +3 | [email protected] |
1
Low
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25
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436 | 1 year ago | Equity Crowdfunding | 7 | 3.7M | 1447 | 6 months ago | |
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Factored | - | Embedded property financing | Factored empowers property owners to access capital from their future rental inc... | - |
United Kingdom
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London | United Kingdom (HQ) | 2023 | Financial Services, Fintech +5 | [email protected] |
1
Low
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3
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572 (2387%) | 1 year ago | Non Equity Assistance | 3 | 300.0K | 928 | 5 months ago | |
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Silicon Microgravity Ltd | - | ..sensing the world | Silicon Microgravity Limited (SMG) is a technology company focused on the inerti... | - |
United Kingdom
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Cambridge | United Kingdom (HQ) | 2016 | Energy, Energy Efficiency +2 | [email protected] |
1
Low
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17
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669 (-33%) | 2 years ago | Series Unknown | 3 | 13.5M | 1972 | 9 months ago | |
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mopo (Mobile Power) | - | A pay-per-use battery technology company revolutionising the supply of sustainab... | MOPO is a pay-per-use battery technology company focussed on the supply of susta... | - |
United Kingdom
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Sheffield | United Kingdom (HQ) | 2013 | Energy, Clean Energy +1 | - |
1
Low
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71
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1.1K (1975%) | 1 year ago | Series Unknown | 4 | 5.7M | 2179 | 5 months ago | |
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Propflo | - | Removing the barriers to making homes green: AI-powered insights and retrofit e... | Propflo is an award winning platform that supports businesses to get their custo... | - |
United Kingdom
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Bristol | United Kingdom (HQ) | 2021 | AI, B2B +4 | [email protected] |
1
Low
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7
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1.2K (25%) | 1 year ago | Grant | 3 | 1.1M | 3435 | 6 months ago | |
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GridDuck | - | The Intelligent Energy Saving System for Commercial Buildings | An IoT energy management system for reducing waste energy consumption by remotel... | - |
United Kingdom
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London | United Kingdom (HQ) + 1 | 2015 | Hardware, IoT +1 | [email protected] |
1
Low
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11
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8.7K (71%) | 1 year ago | Series A | 5 | 978.5K | 579 | 5 months ago | |
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Nova Innovation | - | Nova Innovation is a world-leading tidal energy company with proven technology a... | Nova Innovation is a world-leading tidal energy company - transforming the power... | - |
United Kingdom
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Edinburgh | United Kingdom (HQ) | 2010 | Energy, Renewable Energy +1 | [email protected] |
1
Low
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48
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1.9K | 1 year ago | Grant | 6 | 30.0M | 9588 | 5 months ago | |
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AlgaeCytes | - | Harnessing the potential of microalgae to provide a new generation of health and... | AlgaeCytes is focused on the production of Omega 3 oils and other bio actives fr... | - |
United Kingdom
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Sandwich | United Kingdom (HQ) | 2010 | Biopharma, Biotechnology +2 | [email protected] |
1
Low
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14
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798 (-100%) | 3 years ago | Grant | 3 | 16.0M | 1312 | 7 months ago | |
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Telensa | - | World #1 in connected street lighting and smart city wireless networks. | Telensa makes wireless smart city control applications, including the world’s mo... | - |
United Kingdom
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Cambridge | United Kingdom (HQ) + 1 | 2007 | Energy Efficiency | [email protected] |
1
Low
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64
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1.3K (18%) | 9 years ago | Series Unknown | 1 | 18.0M | 6971 | 6 months ago | |
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Demand Logic | - | Award-winning building optimisation platform: Save energy, maximise asset value,... | Demand Logic is a multi-award winning building optimisation platform which provi... | - |
United Kingdom
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London | United Kingdom (HQ) | 2007 | Energy, Real Estate +2 | [email protected] |
1
Low
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26
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30193 | - | Seed | - | 2.0M | 2570 | 5 months ago | |
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SulNOx Group PLC | - | Taking you Further, Faster and Cleaner | The SulNOx Group helps a wide range of industrial sectors to reduce emissions, l... | - |
United Kingdom
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London | United Kingdom (HQ) | 2012 | Manufacturing, Energy Efficiency +1 | [email protected] |
1
Low
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15
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23143 | - | Post Ipo Equity | - | 700.0K | 949 | 5 months ago | |
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Switchee | - | B Corp™ | Data-driven property insights for social landlords. |
Switchee improves the quality of life for people living in rented homes. Switch... |
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United Kingdom
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London | United Kingdom (HQ) | 2015 | Analytics, Consumer Electronics +5 | [email protected] |
1
Low
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107
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10.6K (-19%) | 10 months ago | Series Unknown | 9 | 17.4M | 6560 | 5 months ago | |
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Trident Energy | - | Powering offshore renewables with innovative, cost-efficient technology for clea... | Trident Energy is an independent developer of enabling technology for the offsho... | - |
United Kingdom
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London | United Kingdom (HQ) + 1 | 2003 | Energy, Information Technology +2 | - |
1
Low
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6
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1.7K (13%) | 12 years ago | Angel | 2 | 440.0K | 79248 | 10 5A4 JKs | |
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Signol | - | A software service providing behaviour change for emissions-heavy industries. | For companies struggling to transform their net zero strategies from reporting t... | - |
United Kingdom
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London | United Kingdom (HQ) + 1 | 2017 | Transportation, Energy Efficiency +1 | [email protected] |
1
Low
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38
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413 (37%) | 9 months ago | Series Unknown | 8 | 10.5M | 2987 | 5 months ago | |
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tem. | - | Renewable energy, revolutionised for small business. | We want to create a world where anyone can access the renewable energy they need... | - |
United Kingdom
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London | United Kingdom (HQ) | 2021 | Energy, Industrial +2 | [email protected] |
1
Low
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57
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2.8K | 8 months ago | Series A | 3 | 16.9M | 2113 | 8 months ago | |
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Vibrant Energy Matters | - | UK's leading provider of EPCs and related energy services to the commercial and... | Established in 2008 to carry out EPCs, our services expanded from 2015 to includ... | - |
United Kingdom
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Blackwood | United Kingdom (HQ) | 2008 | Prop Tech, Real Estate +1 | [email protected] |
1
Low
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110
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10.1K | 16 years ago | Series A | 1 | 2.9M | 2199 | 3 months ago | |
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Energy 4 Impact | - | Putting energy at the heart of development | Energy 4 Impact is Mercy Corps’ energy innovation platform, dedicated to improvi... | - |
United Kingdom
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London | United Kingdom (HQ) | 2006 | Energy, Energy Efficiency | [email protected] |
1
Low
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28
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314 (-100%) | 7 years ago | Grant | 1 | 1.0M | 11809 | 5 months ago | |
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Thermulon | - | Rapid, scalable and affordable aerogel production. It’s here. | Thermulon’s process foregoes the current conditions that make aerogels difficult... | - |
United Kingdom
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- | United Kingdom (HQ) + 1 | 2019 | Energy, Manufacturing +2 | [email protected] |
1
Low
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14
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1.2K | 2 years ago | Series Unknown | 3 | 694.5K | 2281 | 7 months ago | |
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OakTree Power | - | Reinventing energy consumption for industrial and commercial clients using our l... | OakTree Power is the leading climate technology provider headquartered in London... | - |
United Kingdom
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London | United Kingdom (HQ) | 2020 | Energy, Clean Energy +1 | [email protected] |
1
Low
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19
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1.2K | 1 year ago | Non Equity Assistance | 2 | Unknown | 2646 | 6 months ago | |
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Geothermal Engineering Lt... | - | Delivering geothermal power, heat and lithium for a cleaner future. | Geothermal Engineering is bringing the most experienced geothermal engineers tog... | - |
United Kingdom
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- | United Kingdom (HQ) | 2008 | Energy, Energy Efficiency | [email protected] |
1
Low
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15
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894 (-100%) | 2 years ago | Private Equity | 2 | 18.8M | 3155 | 7 months ago | |
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Energy Local | - | Making energy work for you | Energy Local is a ground breaking social enterprise bring to together communitie... | - |
United Kingdom
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- | United Kingdom (HQ) | 2013 | Renewable Energy, Semiconductor +1 | - |
1
Low
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11
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2.7K | 2 years ago | Grant | 1 | 50.0K | 420 | 5 months ago | |
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The Heat Vault Company | - | Securing Energy. Naturally | The Heat Vault Company provides a solution to both short-term and long-term ener... | - |
United Kingdom
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- | United Kingdom (HQ) + 2 | 2021 | Energy, Renewable Energy +3 | [email protected] |
1
Low
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6
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12431 | - | Equity Crowdfunding | - | 374.0K | 456 | 6 months ago | |
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Ardenham Energy Ltd | - | Ardenham Energy, a nationwide installer of commercial solar PV and heat pumps. w... | Founded in 2007, Ardenham Energy was the first company in the UK to be awarded M... | - |
United Kingdom
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- | United Kingdom (HQ) | 2007 | Energy, Renewable Energy +1 | [email protected] |
1
Low
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5
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858 | 13 years ago | Series A | 1 | 2.0M | 934 | 7 XRi uDn | |
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First Light Fusion | - | The world’s leading inertial fusion company. Our mission: Fusion power by the si... | First Light Fusion Ltd is a lean, focused and agile corporation researching ener... | - |
United Kingdom
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- | United Kingdom (HQ) | 2011 | Energy, Renewable Energy +1 | [email protected] |
1
Low
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93
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13.2K (81%) | 3 years ago | Series C | 7 | 107.0M | 15543 | 3 months ago | |
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Metrikus | - | Your building data on demand | Whether you’re using building data to analyze, visualize or build, the chaotic s... | - |
United Kingdom
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London | United Kingdom (HQ) | 2019 | API, Energy +4 | [email protected] |
1
Low
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36
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4.0K (-33%) | 4 years ago | Series A | 2 | Unknown | 5000 | 1 year ago |