Introduction
Renewable energy delivery in the UK is now driven by two overlapping groups: Tier-1 developers/utilities delivering multi-GW portfolios (offshore wind, onshore wind, solar, storage) and Tier-2 EPC/specialist contractors who actually design, build, connect and maintain projects on the ground.
This guide brings both together so buyers can quickly see who leads the market and who they can hire for delivery in 2025. At the same time, supporting infrastructure such as sustainable welfare solutions are critical to keep projects safe and compliant from day one.
The Top 20 (UK)
1) SSE Renewables
A leading UK/Ireland developer-operator with >2.5 GW delivered offshore and a major onshore fleet; projects include Seagreen (Scotland’s largest, world’s deepest fixed-bottom offshore farm). Strong pipeline across offshore/onshore wind and storage.
🔗 https://www.sserenewables.com/offshore-wind/
2) EDF Power Solutions UK & Ireland
Develops and operates wind, solar and battery storage across the UK with multi-GW pipelines; active on transmission-connected BESS and large solar.
🔗 https://www.edf-powersolutions.uk/
3) ScottishPower Renewables (Iberdrola)
Portfolio includes ~3.1 GW operational capacity and landmark offshore projects (East Anglia). Active in repowering and expansion.
🔗 https://www.scottishpower.com/pages/renewables.aspx
4) Ørsted (UK)
Global offshore wind leader developing Hornsea 3 (2.9 GW); huge UK offshore footprint with multi-GW pipeline.
🔗 https://orsted.com/en/uk
5) RWE Renewables UK
Major UK player across onshore/offshore wind and now utility-scale solar; Langford Solar recently energized; extensive pipeline.
🔗 https://uk.rwe.com/rwe-renewables-uk/
6) Vattenfall UK
Operates UK wind and battery storage assets (~1.1 GW) with a broad wind portfolio (onshore & offshore).
🔗 https://www.vattenfall.co.uk/
7) Statkraft UK
Europe’s largest renewable power producer; in the UK invests, develops and supports >6 GW via PPAs; active across wind/solar and market services.
🔗 https://www.statkraft.co.uk/
8) Lightsource bp
Global solar developer with end-to-end develop–finance–build–operate capabilities; long track record delivering utility-scale PV in the UK.
🔗 https://lightsourcebp.com/uk/
9) RES (Renewable Energy Systems)
World’s largest independent renewables company; active in wind, solar, storage & O&M. Recently awarded O&M for the UK’s largest solar farm (Cleve Hill).
🔗 https://www.res-group.com/
10) Octopus Energy Generation
Investor/developer across onshore/offshore wind, solar and storage; recently acquired a 10% stake in East Anglia One.
🔗 https://www.octopusenergygeneration.com/
11) Anesco (EPC & O&M)
UK pioneer in utility-scale battery storage and solar EPC/O&M; >100 solar farms delivered; 150 MW+ batteries connected and a growing construction pipeline. These projects typically require compliant welfare and site services — areas where euroloo supports the construction sector.
🔗 https://anesco.com/
12) Ethical Power (EPC, Grid & BESS)
Vertically integrated EPC with BESS leadership and ICP capability; rapid growth and new investment in 2025; delivering UK solar + storage and overseas projects.
🔗 https://ethical-power.com/
13) British Solar Renewables – BSR (EPC & O&M)
End-to-end develop–build–operate for utility-scale solar and storage via BSR Energy/EPC/O&M arms; significant UK track record.
🔗 https://britishrenewables.com/uk/bsr-om
14) BELECTRIC UK (EPC)
European EPC delivering new UK utility solar/BESS sites (e.g., projects near Norwich, Hook, Eastfields) with ISO-accredited delivery.
🔗 https://belectric.com/belectric-uk/
15) Voltalia (Developer/EPC)
International IPP/EPC active in the UK & Ireland; EPC on large utility solar and UK development consents.
🔗 https://www.voltalia.com/
16) Bouygues Energies & Services (EPC)
Delivers large UK solar farms (design & build) and grid connections; past UK projects include subsidy-free PV sites for investors.
🔗 https://www.bouyguesenergiesservices.co.uk/
17) OEG Group (Offshore Renewables Services)
Offshore renewables services and O&M across windfarm construction/operations (group includes marine & subsea specialists).
🔗 https://www.oeg.group/
18) Solgen Commercial (Solar EPC & O&M)
UK commercial solar EPC covering design, install, storage and O&M, serving businesses across the South West and beyond.
🔗 https://solgencommercial.co.uk/
19) MD Electrical Construction Renewables
Electrical contractor delivering commercial & industrial solar PV, battery storage and EV charging across London, SE & East of England.
🔗 https://mdelectrical.ltd/renewable-energy-solutions/
20) Clearsol Renewables (Solar O&M)
Independent specialist focused exclusively on O&M for commercial & industrial solar PV—asset management, performance optimisation and maintenance across the UK.
🔗 https://www.clearsol.uk/
(Bonus: Circular Renewables provides after-sales and support for the UK biogas/AD sector—useful for operators needing AD maintenance and tank works.)
Conclusion
From offshore wind giants delivering multi-GW projects to specialist EPCs and O&M providers keeping assets performing day-to-day, the UK market offers a full bench of partners for solar, wind and storage in 2025. Choosing the right mix – developer + delivery contractor + O&M – can accelerate timelines, reduce risk and improve returns.
At euroloo, we know that site welfare and security go hand-in-hand. Alongside our modern, sustainable welfare solutions and nationwide toilet hire, we support contractors and developers in creating safe, compliant, and productive sites across every sector – from construction to facilities management.
