Radar · Energy Efficiency in United Kingdom
Best Energy Efficiency Companies in United Kingdom
The 206 best Energy Efficiency companies in United Kingdom in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Energy Saving Lighting.
By Riya SenguptaFinancials
206companies tracked
$149Mdisclosed funding
0unicorns
33have raised
Ranked by disclosed equity funding and recent momentum, the 206 Energy Efficiency companies tracked here represent the United Kingdom's most fundable slice of the decarbonisation push. Total disclosed funding across the directory sits at $149M, with no unicorns in the mix yet. Energy Saving Lighting leads the field at $26M raised, followed by Autins Group at $12M and SaveMoneyCutCarbon at $9M. The rest of the pack is early-stage and hungry. Most active capital sources are Europa, HSBC, Barclays, and two government channels, which tells you something about where conviction is sitting right now.
What's the underlying pull? App-layer data gives a partial answer: median install growth across energy-related apps is running at roughly +28% YoY across 138 tracked products, a signal that end-user demand is moving faster than funding rounds might suggest. Hot themes include solar PV, EV battery technology, and EV energy management systems, and as shown in 2018 research on energy system modelling, the analytical frameworks underpinning these technologies have been maturing for years. I'd watch the solar electricity generation category especially closely. Coverage across this directory is rising, the institutional money is cautiously present, and the regulatory backdrop in the UK keeps tightening in efficiency's favour. The gap between the top filers and the long tail is wide, which means consolidation is the story waiting to happen.
FLIAR INTELLIGENCE · ENERGY EFFICIENCY × UNITED KINGDOM
Our analysis of 50 Energy Efficiency companies
$1.3b in tracked funding; 52% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2011.
50companies analysed
52%cloud-native stacks
2011funding peak (by rounds)
1unicorns
2007median founding year
201kcombined LinkedIn audience
57%of audience held by top 3
2companies hiring publicly (12 mo)
Ranked: Best Energy Efficiency companies in United Kingdom
| # | Company | Disclosed funding | Last round | Employees | Founded | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Energy Saving Lighting Manufacturer of LED lighting system | $26M | 56 mo ago | 16 | 2008 | — | WordPressPleskMySQL+16 | — | — |
| 2 | Cambridge Clean Energy Energy monitoring solutions for solar installation in off-grid locations | $21M | 136 mo ago | 83 | 2009 | — | — | — | — |
| 3 | Invertek Drives Manufacturer of Electronic Control Motor Hardware 40Product top 37%Market top 42%Funding top 45%Patents top 48% All 10 signals ▾Producttop 37% Markettop 42% Fundingtop 45% Patentstop 48% Techbottom 49% Moatbottom 49% Globalbottom 38% Innovationbottom 37% Growthbottom 35% Newsbottom 24% Product: 2 distinct product lines · 2 published apps (6.7k installs) Market: 380 employees (top 22% of Manufacturing Services) · Top-1,000,000 web property rank vs industry peers · Fliar Intelligence Index 40/100 | $13M | 53 mo ago | 380 | 1998 | — | Site Search 360Windows ServerMicrosoft ASP.NET+18 | 12 patents Industrial power conversion modules, variable-speed drives, and transformer manufacturing systems | 2 launchs · 1 partnership · 1 award |
| 4 | JCC Lighting LED lighting fixtures | $13M | 220 mo ago | 103 | 1989 | — | Adobe Experience ManagerJavaVimeo+11 | 38 patents Advanced LED lighting fixtures and assemblies for commercial/industrial illumination | 3 launchs |
| 5 | Autins Group Manufacturer of automotive acoustic and thermal insulation solutions. 32Tech top 32%Funding top 38%Talent bottom 49%Fin. health bottom 47% All 11 signals ▾Techtop 32% Fundingtop 38% Talentbottom 49% Fin. healthbottom 47% Growthbottom 46% Moatbottom 42% Marketbottom 37% Globalbottom 36% Patentsbottom 34% Newsbottom 32% Innovationbottom 19% Tech: 41 technologies across 5/8 capability areas · Cloud: Cloudflare Funding: Raised $11.6M across 5 rounds · 5 rounds over 6 yrs (0.8/yr) rank vs industry peers · Fliar Intelligence Index 32/100 | $12M | 27 mo ago | 164 | 2014 | Gareth Cook CEO | WordPressApple iCloud MailMicrosoft 365+30 | 2 patents Acoustic insulation enclosures for noise reduction in equipment housings | 1 job opening |
| 6 | Bamboo Developer of energy-efficient Arm-based servers. These servers utilize a parallel Arm node designed… | $12M | 68 mo ago | 15 | 2015 | John Goodacre Founder & CSO | — | — | — |
| 7 | Rotolight Manufacturer of professional LED lighting and smoke effects equipment | $11M | 75 mo ago | 19 | 2009 | — | Cart FunctionalityShopifyVisa+20 | 60 patents Advanced LED lighting and control systems for photography/video illumination | — |
| 8 | Relume Cost-effective LED lighting using silver circuitry thermal management technology | $9M | 172 mo ago | — | 1994 | — | — | — | — |
| 9 | SaveMoneyCutCarbon Provider of energy and water efficiency solutions for businesses and homes. | $9M | 37 mo ago | 50 | 2010 | Mark Sait CEO | WordPressApple iCloud MailMicrosoft 365+46 | — | — |
| 10 | Energy Saving Trust Provider of energy-saving advice and data. It offers guidance on reducing energy consumption and carbon… | $4M | 69 mo ago | 337 | 2000 | — | WordPressBugHerdMySQL+22 | — | — |
| 11 | EuroSite Power Supplier and installer of combined heat & power systems | $4M | 121 mo ago | 12 12 → 16 (+33%) | 2010 | Elias Samaras CEO | WordPressMySQLPHP+16 | — | — |
| 12 | MHA Lighting Builder of sanitation facilities and promoter of hygiene awareness | $2M | 158 mo ago | — | 2009 | Tom Harrison CEO & MD | — | — | — |
| 13 | LSUK Lighting LED and Induction lighting systems | $2M | 140 mo ago | 12 | 2011 | Rich Coates CEO | — | — | — |
| 14 | Energys Group Provider of energy efficiency and decarbonization solutions for buildings. | $2M | 70 mo ago | — | 2005 | — | WordPressMySQLPHP+28 | — | — |
| 15 | Low Carbon Lighting LED lighting products manufacturer | $2M | 169 mo ago | 6 | 2010 | Michael McNeill CEO | — | — | — |
| 16 | ReEnergise Provider of decarbonisation plans and project management for educational estates. | $2M | 143 mo ago | 16 | 2010 | Steve Faucherand CEO | — | — | — |
| 17 | European Thermodynamics Provider of integrated communication services for large organizations | $1M | 65 mo ago | — | 2002 | Kevin Simpson Co-Founder & Technical Director | Cart FunctionalityWooCommerceWordPress+27 | 47 patents Patents concentrated in electrical & electronics | — |
| 18 | Nusku Manufacturer of heating system for energy efficiency | $1M | 25 mo ago | — | 2022 | Russell Murchie Founder & CEO | Cart FunctionalitySquarespace CommerceSquarespace+14 | 2 patents Residential heating system design and enclosure technologies | — |
| 19 | Bio Nano Consulting Developer of biosensors and digital platforms for water and health applications. | $689K | 113 mo ago | 9 | 2007 | David Sarphie CEO & Director | — | — | — |
| 20 | Carbonlights Industry and commercial LED lighting | $459K | 135 mo ago | 7 | 2008 | Barrie Clatworthy CEO & MD | — | — | — |
| 21 | LUMENSTREAM Platform offers LED lighting | $453K | 11 mo ago | 1 | 2017 | — | WordPressMySQLPHP+29 | — | 1 partnership |
| 22 | ARC Power Developer of solar energy projects 13Talent top 38%Funding top 49%Global bottom 37%Tech bottom 31% All 5 signals ▾Talenttop 38% Fundingtop 49% Globalbottom 37% Techbottom 31% Marketbottom 16% Talent: 2 named leaders on record · 2 C-suite/founder profiles curated Funding: Raised $369k across 5 rounds · 5 rounds over 6 yrs (0.8/yr) rank vs industry peers · Fliar Intelligence Index 13/100 | $369K | 15 mo ago | 5 | 2016 | Oliver Blakeman Co-Founder & CTO | PythonFedoraYouTube+11 | — | 1 partnership |
| 23 | Jigsaw Solutions Provider of heating products | $342K | 53 mo ago | 7 | 2017 | — | — | — | — |
| 24 | Kosnic Lighting Manufacturer of LED lighting solutions and bespoke luminaires | $291K | 97 mo ago | — | 2002 | Ying Hu Co-Founder & Managing Director | WordPressZohoMySQL+23 | 23 patents Modular mounting hardware and brackets for downlight luminaires and installation systems. | 7 launchs |
| 25 | River Provider of telecoms and renewable energy solutions for businesses. | $166K | 44 mo ago | 7 | 2013 | Guy Hunter Co-Founder | — | — | — |
| 26 | Kensa Heat Pumps Manufacturer of heat pumps | $111K | 40 mo ago | 65 65 → 142 (+118%) | 2006 | James S. Managing Director | — | 6 patents Multi-zone heating/cooling systems using centralized heat pump technology | 1 job opening |
Top 12 Energy Efficiency companies in United Kingdom
#1
Seed · Belfast, Northern Ireland · founded 2017 · 1 employees$453.2Kraised▾
Seed · Belfast, Northern Ireland · founded 2017 · 1 employees
Platform offers LED lighting
LinkedIn Pulse recent public activity · Jul 2026
Audience: 558 LinkedIn followers
Activity: 1 partnerships (incl. Transport UK London Bus' Bow Battersea Depot) announced in 12 mo
Funding rounds
- Jul 2025Seed$1.6M
- Oct 2022Seed$453.2K
Investors
Techstart Ventures, Clarendon Fund Managers
#2
Public · Rugby, England · founded 2014 · 164 employees$11.6Mraised▾
Public · Rugby, England · founded 2014 · 164 employees
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Fliar Intelligence Index™ 32how this company ranks against its industry peers
Tech
top 32%Funding
top 38%Talent
bottom 49%Fin. health
bottom 47%Growth
bottom 46%Moat
bottom 42%Tech: 41 technologies across 5/8 capability areas · Cloud: Cloudflare · Devops: Nginx
Funding: Raised $11.6M across 5 rounds · 5 rounds over 6 yrs (0.8/yr) · Last round Post IPO (Mar 2024)
Talent: 1 named leader on record · 1 C-suite/founder profile curated
Audience (LinkedIn): 2k LinkedIn followers
Hiring (LinkedIn): 2 hiring posts in 12 mo (public) · momentum +2 · hiring: Account Manager, Non-Woven Engineer
Funding rounds
- Mar 2024Post IPO$4M
- Oct 2022Post IPO$180.8K
- Jan 2022Grant (prize money)$27.2K
- Nov 2021Post IPO$4M
Founders & team
Investors
Braveheart Investment Group, HSBC, Coventry City Council
Tech stack
Animate.CssAnime.JsApple Icloud MailCloudflareCloudflare Bot ManagementContact Form 7
#3
Seed · Spennymoor, England · founded 2016 · 4 employees$64.4Kraised▾
Seed · Spennymoor, England · founded 2016 · 4 employees
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Fliar Intelligence Index™ 53how this company ranks against its industry peers
Tech
top 28%Innovation
top 30%Growth
top 35%Product
top 48%Funding
bottom 37%Global
bottom 32%Tech: 32 technologies across 5/8 capability areas · Cloud: Cloudflare · Observability: Microsoft Clarity
Innovation: 3 product lines
Growth: Fresh capital in last 24 mo
Audience (LinkedIn): 2k LinkedIn followers
Activity (LinkedIn): 1 awards announced in 12 mo
Funding rounds
- Dec 2025Seed—
- Oct 2020Conventional Debt$64.4K
Investors
NEL Fund Managers, Barclays
Tech stack
Apple PayBootstrapCart FunctionalityCloudflareCloudflare Bot ManagementCore-Js
#4
Seed · London, England · founded 2016 · 5 employees$368.8Kraised▾
Seed · London, England · founded 2016 · 5 employees
Developer of solar energy projects
Fliar Intelligence Index™ 13how this company ranks against its industry peers
Talent
top 38%Funding
top 49%Global
bottom 37%Tech
bottom 31%Market
bottom 16%Talent: 2 named leaders on record · 2 C-suite/founder profiles curated
Funding: Raised $369k across 5 rounds · 5 rounds over 6 yrs (0.8/yr) · Last round Seed (Mar 2025)
Global: Investors from 2 countries beyond United Kingdom
Audience (LinkedIn): 5k LinkedIn followers — 2.5% of this cohort's audience
Activity (LinkedIn): 1 partnerships (incl. Kyona Energy Limited) announced in 12 mo
Funding rounds
- Mar 2025Seed$2.8M
- Sep 2023Seed$2.7M
- May 2020Seed$368.8K
- Jul 2019Seed$624.9K
Founders & team
Investors
REPP, Frontier-Invest, Triodos Investment Management, ARC Group
#5
Acquired · Bury St Edmunds, England · founded 2010 · 50 employees$9.1Mraised▾
Acquired · Bury St Edmunds, England · founded 2010 · 50 employees
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LinkedIn Pulse recent public activity · Jul 2026
Audience: 3k LinkedIn followers
Funding rounds
- May 2023PE$6.2M
- May 2020PE—
- May 2017PE$2.9M
Founders & team
Investors
Barclays, IW Capital, Low Carbon Innovation Fund, Liuhe Zhiqian
Tech stack
Alpine.JsApple Icloud MailBootstrapClipboard.JsCloudflareCloudflare Bot Management
#6
Series B · Winkfield, England · founded 2008 · 16 employees$26Mraised▾
Series B · Winkfield, England · founded 2008 · 16 employees
Manufacturer of LED lighting system
LinkedIn Pulse recent public activity · Jul 2026
Audience: 5k LinkedIn followers — 2.3% of this cohort's audience
Funding rounds
- Sep 2021Conventional Debt—
- Sep 2021Series B$26M
Investors
Bestport Private Equity, ThinCats, Murray Capital
Tech stack
Apache Http ServerDiviGoogle AdsenseGoogle AnalyticsGoogle Font ApiJquery
#7
Seed · Bristol, England · founded 2022$1.2Mraised▾
Seed · Bristol, England · founded 2022
Manufacturer of heating system for energy efficiency. Company system design for straightforward replacement of gas boilers.
Funding rounds
- May 2024Seed$306.9K
- May 2024Grant (prize money)$908.7K
Founders & team
Investors
Gov
Tech stack
Amazon Web ServicesAngularCart FunctionalityCore-JsGoogle Font ApiHsts
#8
Acquired · Welshpool, Wales · founded 1998 · 380 employees$13.2Mraised▾
Acquired · Welshpool, Wales · founded 1998 · 380 employees
Manufacturer of Electronic Control Motor Hardware
Fliar Intelligence Index™ 40how this company ranks against its industry peers
Product
top 37%Market
top 42%Funding
top 45%Patents
top 48%Tech
bottom 49%Moat
bottom 49%Product: 2 distinct product lines · 2 published apps (6.7k installs) · Company stage: Acquired
Market: 380 employees (top 22% of Manufacturing Services) · Top-1,000,000 web property
Funding: Raised $13.2M across 1 rounds · 1 rounds over 5 yrs (0.2/yr) · Last round Series B (Dec 2021)
Audience (LinkedIn): 10k LinkedIn followers — 4.9% of this cohort's audience
Activity (LinkedIn): 2 product launches · 1 partnerships · 1 awards (incl. local contractor) announced in 12 mo
Funding rounds
- Dec 2021Series B$13.2M
Tech stack
AzureBootstrapCloudflareCloudflare Bot ManagementCookieyesCore-Js
#9
Deadpooled · Cambridge, England · founded 2015 · 15 employees$11.5Mraised▾
Deadpooled · Cambridge, England · founded 2015 · 15 employees
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Funding rounds
- Sep 2020Series A$7M
- Dec 2019Seed$4.5M
Founders & team
Investors
Seraphim, Opea, Ab Analitica, Biofield Innovation, Lae-Srl
#10
Series A · London, England · founded 2009 · 83 employees$21Mraised▾
Series A · London, England · founded 2009 · 83 employees
Cambridge Clean Energy, UK based company formed through the combination of Cambridge Energy Resources (CER) and Clean Power Systems Holdings (CPS), provide power solutions and energy management solution-as-a-service (EMSaaS) for base stations of mobile network operators in India and Africa. It provide solar installation and their monitoring solutions like telecom controller, DC cooling, power system management.
Funding rounds
- Feb 2015Series A$21M
Investors
Amadeus Capital
#11
Series A · Iver, England · founded 2009 · 19 employees$11Mraised▾
Series A · Iver, England · founded 2009 · 19 employees
Manufacturer of professional LED lighting and smoke effects equipment for photographers and filmmakers. The company designs and produces a range of LED lighting products, offering various features and functionalities to meet diverse creative needs. In addition, it provides smoke effects equipment for use in photography and filmmaking. The products are intended to provide image makers with tools to achieve their creative vision.
Funding rounds
- Mar 2020Conventional Debt$4.5M
- Feb 2019Series A$6.5M
Investors
Clydesdale Bank, Octopus Investments, Angel Investment Network
Tech stack
American ExpressApple PayBootstrapCart FunctionalityCdnjsCloudflare
#12
Funding Raised · London, England · founded 2000 · 337 employees$4Mraised▾
Funding Raised · London, England · founded 2000 · 337 employees
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Funding rounds
- Sep 2020Grant (prize money)$275K
- Sep 2019Grant (prize money)$335.1K
- Jun 2019Grant (prize money)$413.2K
- Sep 2017Grant (prize money)$321.4K
Investors
Europa
Tech stack
AzureBootstrapBugherdCloudflareCloudflare Browser InsightsCore-Js
Funding & investor landscape
$149Mtotal disclosed funding
30companies funded
57disclosed rounds
0rounds last 90 days
Most active investors
Gov4 rounds
Notable founders
Gareth Cook
CEO · Autins Group
Oliver Blakeman
Co-Founder & CTO · ARC Power
Karl Boyce
Co-Founder & CEO · ARC Power
Mark Sait
CEO · SaveMoneyCutCarbon
Russell Murchie
Founder & CEO · Nusku
John Goodacre
Founder & CSO · Bamboo
Elias Samaras
CEO · EuroSite Power
Kevin Simpson
Co-Founder & Technical Director · European Thermodynamics
Nick Porter
Co-Founder & Managing Director · European Thermodynamics
Tom Harrison
CEO & MD · MHA Lighting
Rich Coates
CEO · LSUK Lighting
Michael McNeill
CEO · Low Carbon Lighting
RESEARCH SIGNALS · United Kingdom
How research on Energy Efficiency & Buildings is moving in the United Kingdom
A read on the academic research around Energy Efficiency & Buildings — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 1,186 United Kingdom-affiliated papers.
research sentiment over time
200820172026
enthusiastic · positive · guarded tone
Tone is overwhelmingly optimistic and intensifying — the enthusiastic (strongly-positive) share moved 25% → 50% across 2008–2026.
top research entities
- University of Nottingham96
- Imperial College London51
- Loughborough University48
- Institute of Refrigeration47
- University College London36
leading researchers
Saffa Riffat · Neil Hewitt · Christos N. Markides · Zhibin Yu · Anthony Paul Roskilly · Ming Jun Huang · T. Logenthiran · Y.T. Ge
▲
Breakthroughs231 · 19%
▲ 14%→23% share
▲1.6× share momentum4 median citations62% since 2021mostly methods-led
Phase-change material research newly emerged while Heat pump breakthroughs tripled (9→33), signalling rapid thermal innovation.
rising sub-themes (early→recent)
- Energy management13→47
- Renewable energy6→31
- Heat pump9→33
- Microgrid5→25
- Battery (electricity)1→15
Newly emergingPhase-change material 0→8 · TRNSYS 0→7 · Waste heat 0→6
Landmark Energy Management in Autonomous Microgrid Using Stability-Constrained Droop Control of Inverters · 726 cites
◆
Advancements683 · 58%
▼ 58%→55% share
▼0.9× share momentum3 median citations51% since 2021mostly methods-led
Heat pump advancements intensifying — papers rose from 81 to 118, the largest absolute gain across all advancement sub-topics.
rising sub-themes (early→recent)
- Energy management29→69
- Heat pump81→118
- Renewable energy19→51
- Energy storage8→31
- Microgrid11→32
Newly emergingControl theory (sociology) 0→8 · Radiative cooling 0→6 · Life-cycle assessment 0→6
Landmark Combined analysis of electricity and heat networks · 717 cites
▼
Concerns163 · 14%
▲ 14%→15% share
▲1.1× share momentum4 median citations58% since 2021mostly empirical
Heat pump concerns are doubling (24→50) alongside Electricity concerns rising sharply, flagging growing grid and performance risk awareness.
rising sub-themes (early→recent)
- Heat pump24→50
- Electricity9→23
- Environmental economics1→10
- Renewable heat4→11
- Electrification1→8
Landmark Energy Management in Plug-in Hybrid Electric Vehicles: Recent Progress and a Connected Vehicles Perspective · 712 cites
RESEARCH HOTSPOTS · United Kingdom
Where energy efficiency is researched across United Kingdom
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
London159 · +0.41
Glasgow66 · +0.53
Edinburgh49 · +0.54
Oxford44 · +0.42
Manchester33 · +0.52
Birmingham32 · +0.57
Cambridge24 · +0.23
Bristol9 · +0.28
PATENT SIGNAL · United Kingdom
Who's filing energy efficiency patents in the United Kingdom
United Kingdom energy efficiency patent filing is accelerating — 271 filings from 212 assignees (2016–2025), led by Mitsubishi Electric, Mitsubishi Electric R&D CT Europ, Octopus Energy Heating; annual filings 11→55.
271 filings212 assigneespeak 55/yr2016–2025
filing momentum (YoY 2016–2025)
top patent filers
- Mitsubishi Electric27
- Mitsubishi Electric R&D CT Europ27
- Octopus Energy Heating25
- Infineum INT18
- GRID EDGE15
- Smith S Environmental Products15
- Thermal Energy Systems14
- Atalla NAJI AMIN14
Common questions
How many Energy Efficiency companies are there in United Kingdom?
Radar tracks 206 indexable Energy Efficiency companies headquartered in United Kingdom that meet our profile-completeness bar.
What is the total funding raised by Energy Efficiency companies in United Kingdom?
The Energy Efficiency companies in United Kingdom on this list have raised a combined $149M in disclosed equity funding across 30 funded companies.
Which is the highest-funded Energy Efficiency company in United Kingdom?
Energy Saving Lighting is the highest-funded Energy Efficiency company in United Kingdom, with $26M in disclosed equity funding.
How many Energy Efficiency companies in United Kingdom are funded?
30 of the 206 Energy Efficiency companies in United Kingdom on this list have disclosed at least one equity funding round.
How many Energy Efficiency unicorns are there in United Kingdom?
None of the Energy Efficiency companies in United Kingdom on this list currently has a disclosed valuation of $1B or more.
Who are the top investors in United Kingdom Energy Efficiency companies?
The most active investors in United Kingdom Energy Efficiency companies on this list include Europa, Gov, HSBC, Barclays, Gov.uk.
Riya SenguptaFinancials
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.