The demand for UK green energy companies is rising faster than ever. With government support, investor confidence and a national push toward net zero, the clean energy sector is becoming a core pillar of the UK economy.
But which green energy companies in the UK are leading the way? And what can the latest data tell us about the future of the sector?
This article breaks down the landscape of UK green energy firms, analysing data, growth trends and the Top 10 companies shaping the nation’s renewable energy transition.
Why Focus on UK Green Energy Companies Now?
The UK is experiencing fast growth across renewable energy, battery storage, hydrogen and clean technology. Startups and scale-ups are expanding rapidly, supported by strong investor appetite and favourable government frameworks.
A Data-Driven Look at UK Green Energy Companies
Using DataGardener’s UK company intelligence, we assess:
- How UK green energy companies are structured
- Their leading geographical hubs
- Which business models are scaling
- Where future investment is moving
The Big Picture: How Fast Are UK Green Energy Companies Growing?
Sector expansion
Data shows that:
- In 2013: 6,345 active clean energy companies
- In 2024: 11,841 active companies
This demonstrates a decade of consistent growth for green energy companies in the UK.
Government support
The 2025 Clean Energy Industries Sector Plan includes:
- Over £30 billion per year in clean energy investment by 2035
- £40 billion already committed by private investors
Global momentum
In 2025, the IEA expects:
- $2.2 trillion of global energy investment to flow into clean energy
- Storage innovation to accelerate grid readiness
Key Metrics and Trends Among UK Green Energy Companies
Where are UK green energy companies located?
DataGardener tracks nearly 16,000 UK green energy companies. Key hubs include:
- London: 3,268 companies
- South East and South West
- Scotland: 1,094 companies with offshore wind strength
Company maturity
- 31% seed stage
- 24% venture
- 27% established
- 11% growth
This reflects a strong mix of early innovation and scaling renewable energy businesses.
Investment trends
- 2015: £437 million
- 2024: £1.27 billion
- 2025 (so far): £1.29 billion
Rising investment proves increasing confidence in UK renewable energy companies.
Top 10 UK Green Energy Companies (2025)
Ranked by equity raised and impact on the UK’s clean energy transition.
10. Renewable Power Capital
- Founded: 2020, London
- Equity: ~£180 million
- Focus: Solar, onshore wind, battery storage
- Role: Major developer expanding renewable energy capacity across Europe and the UK.
9. Venterra Group
- Founded: 2021, London
- Equity: ~£219 million
- Focus: Offshore wind engineering
- Role: Supports the growth of UK offshore wind, a core part of the country’s clean power generation.
8. Tokamak Energy
- Founded: 2015, Oxfordshire
- Equity: ~£222 million
- Focus: Fusion energy
- Role: A high-tech player advancing next-generation clean baseload energy.
7. Field
- Founded: 2020, London
- Equity: ~£282 million
- Focus: Battery energy storage
- Role: Provides essential storage solutions for renewable energy integration.
6. Fidra Energy
- Founded: 2023, Edinburgh
- Equity: ~£445 million
- Focus: Large-scale storage
- Role: One of the fastest-growing UK storage firms improving grid stability.
5. OVO Group
- Founded: 2015, Bristol
- Equity: ~£459 million
- Focus: Clean energy supply, heat pumps
- Role: A major green energy supplier enhancing household access to renewables.
4. ITM Power
- Founded: 2001, Sheffield
- Equity: ~£481 million
- Focus: Hydrogen systems
- Role: A pioneer in green hydrogen, a key future technology for decarbonisation.
3. GRIDSERVE
- Founded: 2016, Iver
- Equity: ~£623 million
- Focus: EV charging, solar, storage
- Role: Drives the UK’s EV transition through high-speed charging infrastructure.
2. Zenobē
- Founded: 2016, London
- Equity: ~£1.02 billion
- Focus: Battery storage and EV fleet charging
- Role: One of the most influential UK green energy companies in the storage space.
1. Octopus Energy
- Founded: 2015, London
- Equity: ~£1.22 billion
- Focus: Renewable energy supply and energy tech
- Role: The UK’s largest green energy disruptor, leading globally in clean energy technology.
Why These UK Green Energy Companies Matter
Sector diversity
The mix of hydrogen, fusion, EV charging, storage and energy supply strengthens the UK’s clean energy future.
Storage as a foundation
Companies like Zenobē, Field and Fidra Energy are making large-scale renewable adoption possible.
Consumer-led energy transition
Retail innovators such as Octopus and OVO are making renewable energy mainstream for households.
Next-generation clean energy
Fusion and hydrogen companies are paving the way for long-term decarbonisation.
Opportunities and Challenges for UK Green Energy Companies
Opportunities
- Supportive government policies
- Rising investor demand
- Advancements in hydrogen and fusion
- Increased focus on national energy security
Challenges
- Regulatory uncertainty
- Skills shortages
- High capital demands
- Grid integration complexity
What This Means for Investors, Policymakers and Businesses
Investors can choose between infrastructure-style stability or high-potential technology ventures.
Policymakers must support storage, grid upgrades and next-gen energy science.
Businesses can partner with UK green energy companies to decarbonise operations and supply chains.
Conclusion
The rise of UK green energy companies is reshaping the nation’s economic and environmental future. From fusion to battery storage to renewable energy supply, these firms represent the most innovative and impactful contributors to the UK’s transition to clean energy.
For DataGardener, monitoring these companies offers crucial insights into investment opportunities and emerging clean-tech trends that will define the UK’s net-zero pathway.
Conclusion
The rise of UK green energy companies is reshaping the nation’s economic and environmental future. From fusion to battery storage to renewable energy supply, these firms represent the most innovative and impactful contributors to the UK’s transition to clean energy.
For DataGardener, monitoring these companies offers crucial insights into investment opportunities and emerging clean-tech trends that will define the UK’s net-zero pathway.
Resources
UK Government – Department for Energy Security and Net Zero
IEA – International Energy Agency
Ofgem – Renewable Energy & Regulation