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Introduction
The UK and Ireland have become hotspots for startups, with London and Dublin standing out as global hubs of sustainability and green innovation. In 2025, the Top 10 Climate Tech Startups in the UK and Ireland are not only solving climate challenges but also attracting global investors and setting new standards in clean tech, AI, and carbon reduction.
Table of Contents
1. Fuse Energy (UK) – Renewable Energy Disruption
- Achieved unicorn status in under three years with a valuation of over £750M.
- Supplies 50,000 homes across the UK with solar + smart grid solutions.
- Helps households save up to £200 annually by optimizing energy flow.
2. Skyrora (Scotland, UK) – Eco Space Launches
- First UK startup licensed for vertical space launches.
- Uses “Ecosene” fuel made from waste plastic, cutting emissions by 45%.
- Opens opportunities for eco-friendly satellite deployment from Shetland.
3. Mistify AI (Oxford, UK) – Pollution Control Tech
- Tackles dust pollution in construction and mining with AI-powered devices.
- Targets reduction of PM2.5 and PM10 air pollutants that cause health risks.
- Growing rapidly in the industrial sustainability space.
4. Reflo (Manchester, UK) – Sportswear from Plastic Waste
- Converts plastic bottles into high-performance sportswear.
- Recycled over 140,000 bottles and planted 16,000 trees.
- Goal: 1 million trees and 5 million bottles recycled by 2026.
5. Emitwise (London, UK) – AI Carbon Management
- Tracks enterprise carbon footprints in real-time.
- Raised $16.6M Series A to expand globally.
- Helping UK companies stay compliant with net-zero targets.
6. Greenly (UK) – Automated Carbon Accounting
- SaaS platform for tracking Scope 1, 2, 3 GHG emissions.
- Integrates with supply chain and finance data for full transparency.
- Raised $52M Series B to expand across Europe.
7. Clim8 Invest (London, UK) – Sustainable Investing
- Offers green ISAs and investment accounts targeting clean energy firms.
- Attracts climate-conscious investors in the UK market.
- Focused on delivering both impact and returns.
8. Ev.energy (London, UK) – Smart EV Charging
- Smart charging app that reduces EV charging costs.
- Certified B Corp, already active in multiple UK cities.
- Syncs with solar panels for 100% clean charging.
9. Openvolt (Dublin, Ireland) – Carbon Emissions API
- Provides real-time carbon intensity data through APIs.
- Helps startups and enterprises integrate emissions tracking into apps.
- Driving Ireland’s role in the global green fintech ecosystem.
10. Gazelle Wind Power (Ireland) – Offshore Floating Turbines
- Developing floating turbines for deep-sea wind energy.
- Secured multiple international partnerships in 2025.
- Strengthens Ireland’s position in renewable energy innovation.
Conclusion
From Dublin to London, the rise of UK and Ireland startups shows how sustainability, AI, and green finance are shaping the future. These climate-smart companies are not only making business sense but also building a cleaner, greener tomorrow.
👉 To keep track of the latest UK startups, London innovators, and Irish sustainability leaders, follow BestStartup UK.
