Best Energy Companies in Wales, United Kingdom
The 68 best Energy companies in Wales, United Kingdom in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Believ.
Our analysis of 70 Energy companies
$14.2b in tracked funding; 77% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2020.
Ranked: Best Energy companies in Wales
| # | Company | Disclosed funding | Last round | Employees | Founded | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Accelerated Wind Energy Vertical axis wind turbine manufacturer and supplier | — | — | — | 2014 | Leonard Haworth Founder | — | — | — |
| 2 | As Power Engineering Provider of power factor correction and energy monitoring equipments | — | — | — | 2014 | — | — | — | — |
| 3 | BIPV Limited Manufacturer of integrated photovoltaic roof systems | — | — | 11 | 2014 | — | WordPressMySQLZoho+28 | — | — |
| 4 | Cardiff Gas Road fuel gas distribution company | — | — | — | 1982 | — | — | — | — |
| 5 | Celtic Green Energy Renewable energy system installer | — | — | — | 2012 | — | WordPressMySQLPHP+21 | — | — |
| 6 | Cenin Renewables Renewable energy project developer | — | — | — | 2011 | Martyn Popham CEO & MD | — | — | — |
| 7 | DGI Plc Provider of patented solutions that revolutionize electric drivetrains and energy storage | — | — | 25 | 2021 | — | LiteSpeedMicrosoft 365GoDaddy | — | — |
| 8 | Eco2 Renewable energy project developer | — | — | 57 57 → 48 (-16%) | 2002 | — | — | — | — |
Top 12 Energy companies in Wales
#1
Funding Raised · Cardiff, Wales · founded 2021 · 38 employees$407.1Mraised▾
Provider of EV charging infrastructure services. It offers of public EV charging solutions, working with local authorities, businesses, and landowners to accelerate the transition to electric vehicles.
- Jun 2025Conventional Debt$407.1M
#2
Series A · Swansea, Wales · founded 2008 · 14 employees$18.1Mraised▾
Developer of technology for deep-water offshore wind energy deployment. The company engineers modular, flexible technology designed for simplicity and performance in deep-water environments. Their solutions aim to address challenges related to supply chain limitations, deployment complexities, scalability, cost, and risk. The technology facilitates efficient energy yield and streamlined installation using standard vessels.
- Nov 2024Series A$3.6M
- Jul 2021Series A$4.7M
- Dec 2020Series A$7.4M
- Jun 2020Series A$1.9M
#3
Seed · Monmouthshire, Wales · founded 2023$411.5Kraised▾
Platform connecting homeowners with installers for home decarbonisation projects. It streamlines the process of finding and managing installers for homeowners seeking to implement renewable energy solutions. The platform facilitates quoting, planning, and regulatory compliance, ensuring homeowners are connected with installers who deliver quality work. It also provides installers with access to a consistent stream of homeowners and resources for training and compliance.
- Jul 2024Seed$411.5K
#4
Acquired · Cardiff, Wales · founded 2000 · 71 employees$127Mraised▾
Amerisur Resources is a public company focused on exploration and production of oil and gas. The company owns assets in the South American countries such as Colombia and Paraguay.
- Mar 2016Post IPO$35M
- Oct 2012Post IPO$42.1M
- Apr 2010Post IPO$20.9M
- Post IPO$29M
#5
Series A · Cardiff, Wales · founded 2023$934.1Kraised▾
Optimise AI provides decision support tools to reduce energy and carbon consumption in buildings through intuitive insights. Their AI-powered digital twin virtualizes building energy management systems for unprecedented savings. They aim to decarbonize and optimize building energy consumption using autonomous AI technology.
- Mar 2024Series A$934.1K
#6
Acquired · Welshpool, Wales · founded 1998 · 380 employees$13.2Mraised▾
Manufacturer of Electronic Control Motor Hardware
- Dec 2021Series B$13.2M
#7
Series B · Bridgend, Wales · founded 2010 · 8 employees$37.8Mraised▾
Siemens industrial automation equipment provider and integrator. This company offers engineering, design, sales, installation, and commissioning services for Siemens equipment used in industrial plants and machines. They also provide support for Siemens software and licenses, including TIA Portal and SIMATIC software. Additionally, they offer repair services for Siemens products. The company's solutions are tailored to client needs across various industries, from small to large-scale systems. They provide consulting, design, and project oversight, ensuring compliance with industry standards.
- Sep 2013Series B$24.8M
- Sep 2011Series A$2.4M
- 2010Series A$10.7M
#8
Series B · Pembroke Dock, Wales · founded 2006 · 1 employees$16.9Mraised▾
Quietrevolution builds and manufactures wind power turbines. The company offers the following two products : qr5 (a type of vertical axis turbine) and hy5 (a horizontal axis 5kW turbine).
- Mar 2011Series B$8.1M
- Sep 2008Series A$8.8M
#9
Funding Raised · Machynlleth, Wales · founded 1982 · 67 employees$729.5Kraised▾
Manufacturer of renewable energy systems and medical refrigeration equipment. This entity develops and implements renewable energy schemes for solar, wind, and hydro power. They also manufacture off-grid vaccine storage systems and temperature-controlled equipment for the medical and scientific sectors, including refrigerators and incubators. The company provides design, development, and consultancy services across its various offerings, including ongoing maintenance and support.
- Aug 2022Conventional Debt$729.5K
- Jan 2022Grant (prize money)—
#10
Acquired · Denbigh, Wales · founded 2010 · 11 employees$289.7Kraised▾
Residential & commercial solar power providers
- Oct 2022Seed$289.7K
#11
Early Stage · Cardiff, Wales · founded 1998 · 8 employees$1.6Mraised▾
Manufacturer of hydrainer pumps
#12
Acquired · Cardiff, Wales · founded 1978 · 671 employees$3.3Mraised▾
Manufacturer and repair services to FPSO units and gas tankers
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Grid Energy Storage is moving in the United Kingdom
A read on the academic research around Grid Energy Storage — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 2,113 United Kingdom-affiliated papers.
- Imperial College London185
- University of Birmingham115
- University of Cambridge109
- University College London102
- Institute of Physics98
- Battery (electricity)10→109
- Renewable energy5→85
- Electrolyte5→81
- Electrochemistry4→72
- Cathode4→66
- Renewable energy6→223
- Battery (electricity)11→144
- Thermal energy storage5→125
- Photovoltaic system1→71
- Electricity4→73
- Renewable energy5→96
- Battery (electricity)6→65
- Electrolyte3→32
- Nanotechnology5→32
- Cathode2→25
Where energy storage 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.
Who's filing energy storage patents in the United Kingdom
United Kingdom energy storage patent filing is accelerating — 891 filings from 356 assignees (2016–2025), led by Dyson Technology, Highview Entpr, Sunamp; annual filings 61→106.
- Dyson Technology97
- Highview Entpr45
- Sunamp35
- Jaguar LAND Rover34
- Gravitricity33
- Power ROLL33
- Isentropic32
- GE Energy Power Conversion Techn27
Common questions
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.