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RES is the world’s largest independent renewable energy company. At the forefront of the industry for over 40 years, RES has delivered more than 23GW of renewable energy projects across the globe and supports an operational asset portfolio exceeding 12GW worldwide for a large client base.  RES employs more than 2,500 people and is active in 14 countries working across onshore and offshore wind, solar, energy storage and transmission and distribution.


Project portfolio

40 years'



operational assets supported




Driven by our vision to create a future where everyone 
has access to affordable zero carbon energy.

We leverage decades of experience and our industry-leading expertise to deliver results for our clients that surpass expectations.

We're the ideal partner for renewable investors, asset owners, utility companies, commercial and industrial clients, project developers and communities seeking renewable energy solutions.

We exist to serve our clients - they are at the heart of everything we do. Our approach means we deliver projects that meet the needs of the modern energy market.

Our values


We have a passion for what we do, to create a future where everyone has access to renewable energy.
In the markets where we operate, our passion helps us create commitment and resilience.


We are accountable for what we do. We are motivated and empowered to deliver what we are responsible for.
With accountability and trust, decisions are made faster, leading to more agility in our markets.


We work closely with our suppliers, with our clients and with our colleagues regionally and globally to share knowledge and skills.
By collaborating we unleash new opportunities, new ideas and improve results.


Excellence is defined by our clients.
We strive for excellence by talking to our clients, understanding what they need and surpassing their expectations.

These values produce the cultural soil from which our strategy can take root to create growth. They are a guiding force in everything we do and we showcase them to the people around us by demonstrating them in the way we go about our daily work.


We've included some of our key milestones in this timeline and look forward to adding many more in the years ahead. Click on the boxes below to look into our achievements in detail.

  • RES constructs 2.2GW of projects globally

    RES completed construction of 2.2GW of new renewable projects including Haut du Saule Wind Farm in France, the Southern Oak Solar Project in the USA, Murra Warra I Wind Farm in Australia and Solwaybank Wind Farm in the UK.

  • Subsidy free success

    Construction began at Craiggore, our first UK subsidy-free wind farm.

  • Our Support Services portfolio grew

    5.5GW operational assets supported

  • 1GW Corporate PPA Milestone

    Royal Caribbean signs PPA, taking RES' corporate PPA portfolio over 1GW.

  • Murra Warra Wind Farm

    Construction began on the Murra Warra Wind Farm in Australia, which, when fully constructed, will be one of the largest in the southern hemisphere.

  • 300MW Milestone for Energy Storage

    Broxburn Energy Storage energised, meaning RES' global storage portfolio reached 300MW.

  • Globally constructs 1.4 GW

    with the portfolio of developed and/or constructed increasing to over 13 GW, displacing 17 million tonnes of carbon each year.

  • Corporate PPA’s signed

    with companies including General Mills, Tels​tra, Puget Sound and General Motors.

  • Ararat starts generating

    Australia’s third largest wind farm has 75 turbines and a capacity of 240 MW.

  • Ranked #2 by Navigant

    for utility scale energy storage.

  • Google signs Power Purchase Agreement

    to power its data centres from the Bluestem wind farm developed and constructed by RES.

  • First UK energy storage project

    integrated with solar park in Somerset for Western Power Distribution.

  • Won 18.6 MW of solar projects

    in the third round of the French tender.

  • Built two energy storage projects

    totaling 39.6 MW (15.6 MWh) in Illinois, US.

  • Acquired System 3 Inc

    A speciality electrical contractor, to supplement our transmission works.

  • Executed Power Purchase Agreement

    with US electric utility for the RES-developed 149 MW Deerfield wind project.

  • Began building 120 MW Comanche solar project

    in Colorado, US, one of the largest solar facilities east of the Rocky Mountains.

  • Developed 240 MW wind farm

    in Ararat, Australia, third largest in the Southern hemisphere.

  • First 4 MW (2.6 MWh) energy storage project

    became operational in Ohio, US.

  • 5 wind projects in the US

    Developed and constructed totalling 810 MW.

  • 41 MW Alamo 1 solar project

    in Texas, US

  • Montana-Alberta tie-line Completed

    214-mile (345 km), 230 kV.

  • Energised 270 MW Lincs offshore wind farm

    having provided development, engineering, & construction services to Centrica for this project.

  • RESolve

    Developed RESolve energy management system.

  • 76 nautical miles offshore to Round 3 Hornsea met mast.

    First to provide met mast O&M services.

  • 500 MW offshore project

    St Brieuc development in Brittany, France

  • Built first feed-in-tariff solar project in Canada.

    10 MW Rutley solar project.

  • 30 MW solar project

    Constructed in Webberville, Texas, US.

  • 5 MW Puits Castan solar project

    Operation of first solar project in France.

  • Designed & built 94.5 MW

    Havsnäs wind project, the largest onshore wind project in Sweden at the time.

  • Poul la Cour Prize

    awarded to Dr. Ian Mays, RES CEO, by the European Wind Energy Association.

  • Entered Turkish market

    Began development of wind and solar projects.

  • RES provided engineering support

    to develop and complete Centrica's 194 MW Lynn and Inner Dowsing offshore wind farm.

  • Received Advocate Award

    at British Renewable Energy Awards.

  • Received awards for our advisory role

    in creating sustainable buildings by integrating renewable generation and energy saving technologies.

  • First Scandinavian wind farm

    10 MW Hornberget wind project.

  • Financed and constructed first US ownership asset

    60 MW Whirlwind wind project in Texas.

  • 95 MW wind farm

    Developed at Pampilhosa da Serra, Portugal.

  • Business Commitment to the Environment Award

    for redevelopment of RES headquarters, powered by renewable energy.

  • Australia & New Zealand

    Start development of renewable energy projects.

  • 90 MW Inner Dowsing and 270 MW Lincs

    Began development of both offshore wind projects on behalf of Centrica.

  • Completed 21 MW

    Wigton wind project in Jamaica.

  • Completed France's highest wind project

    On the Plateau Ardechois.

  • largest public-owned wind project in the US

    63.7 MW Nine Canyon wind project built.

  • Silver Medal Award

    by the Royal Academy of Engineering for Dr. Ian Mays, RES CEO for pioneering work in wind energy.

  • Commissioned 26 MW Altahullion wind project

    Largest wind project in Ireland.

  • 20.8 MW Souleilla-Corbières project

    Largest wind project in France.

  • Started construction

    13.2 MW Lendrum's Bridge and 26 MW Altahullion wind projects. RES & B9 Energy double N. Ireland's wind energy capacity.

  • Largest wind project in the world at the time

    278 MW King Mountain wind project in Texas.

  • First wind project in California

    60 MW Cameron Ridge wind project, developed & constructed.

  • 47 MW Pacific Crest wind project

    California, US. Constructed for a third-party firm.

  • First commercial 1 MW wind turbine

    Designed & built in the UK and installed in Slievenahanaghan, Co. Antrim.

  • First solar PV project

    Designed & installed in the UK.

  • First wind project

    Operational at Carland Cross in Cornwall.

  • Moved beyond designing turbine technology to developing UK wind projects.

  • A small team within Sir Robert McAlpine began innovative wind turbine engineering.