List of 100 largest renewable energy developers in the United Kingdom [2025]

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List of five large renewable energy developers in the United Kingdom

Due to the UK’s geography and climate, many renewable energy developers are based in the UK. Onshore wind projects in particular, are carried out by these developers, so these companies tend to have a lot of experience. This article looks at the top five renewable energy developers in the UK.

1. Lightsource BP (London)

The pioneer in developing solar energy parks, Lightsource BP, was able to realize renewable energy projects in 14 countries. Based on their mission to transform energy generation more sustainably, the developer implements the projects by using the newest technologies. While aiming for renunciation from the emission-generating energy supply chain, the London-based developer strives to drive the energy transition forward. During the last years, Lightsource BP was able to develop solar projects with a total capacity of 11.5 GW and a 58 GW global solar development pipeline. In 2023, Lightsource sold a finished solar project in the UK involving 300 MW of installed capacity to the global energy producer Sonnedix.

2. Renewable Energy Systems (RES) (Kings Langley)

According to its own information, Renewable Energy Systems (RES) positions itself as the world’s largest independent renewable energy company. By 2025, the company had developed or constructed a total of 28 GW of renewable energy projects worldwide. Through its expanding services division, RES supports an additional 43 GW of operational assets. Active in 24 countries, RES is involved in projects spanning wind, solar, battery storage and green hydrogen. Its current development pipeline includes an additional 26 GW of renewable energy capacity.

3. SSE plc (Perth)

SSE Renewables Limited is a renewable energy developer based in Perth. The company focuses on the construction and development of wind, solar, battery storage and hydro energy projects. In addition to its core market of the United Kingdom, SSE operates in continental Europe and Japan. To date, the developer has brought 5 GW of renewable energy into operation and has a further 2.4 GW under construction. It also has a secured pipeline of 19.1 GW.

4. Octopus Energy Generation (London)

Octopus Energy Generation is one of Europe’s largest renewable energy investors, with a global portfolio of assets worth £6.8 billion. It is also a major developer. Octopus Energy Generation and its portfolio companies manage 3.9 GW of renewable energy projects. The company typically acquires or partners with developers, as it did with the agrivoltaic developer OX2 France in 2025.

5. Green Investment Group (Edinburgh)

Sydney-based Macquarie Group Limited has acquired Green Investment Group after five years in the green infrastructure space. As a result, the Edinburgh-based developer represents one of the world’s largest dedicated green infrastructure investor and developer teams, with the overall aim of accelerating the energy transition. While GIG manages renewable energy projects worldwide, its portfolio of developed projects includes offshore wind farms, solar farms and onshore wind farms. The offshore wind farms alone produce approximately 8GW of wind energy.

Developers for Renewable Energy in the United Kingdom

The need for renewable energy sources is pressing all over the world, including the UK. To deliver effective projects, project developers are needed – from the selection of suitable sites, through design, to the actual planning of renewable energy sites such as solar or wind farms, or other green energy sources such as biomass, hydro, tidal and geothermal energy.

Columns included in the list of Renewable Energy Developers in the United Kingdom

• Company data (Company Name, Legal form, Country of origin)
• Contact details (Address, City, Postcode, URL, E-Mail, Phone, Management)
• Area of activity (Onshore Wind, Offshore Wind, Solar, Hydro, Tidal, Hydrogen projects, Geothermal, Energy storage, Biomass)
• Special Focus (IPP, PPAs, Repowering)
• Further information (Regional Focus, Founding year, installed capacity in MW)

The interconnection between renewable energy investors and developers

In the United Kingdom, the renewable energy sector is characterised by a close collaboration between developers and investors. Developers are responsible for identifying project sites, securing permits, and constructing renewable energy assets. A diverse range of investors, including asset managers, funds, family offices and utilities, provide the capital needed to fund these projects. The collaboration is reinforced by supportive government policies, long-term power purchase agreements (PPAs), and the UK’s net-zero targets, making the developer-investor relationship central to the country’s energy transition. In addition, we are pleased to provide a list of the largest renewable energy investors in the United Kingdom.

Image Sources: Markus Spiske & Nicholas Doherty via Unsplash