Ecotricity is a British energy company based in Stroud, Gloucestershire, specialising in selling green energy to consumers that it primarily generates from its 87.2-megawatt wind power portfolio. It is built on the principle of heavily reinvesting its profit in building more of its own green energy generation.

Green Energy (UK) Ltd, operating as 100Green, is a British independent-energy company based in Ware, Hertfordshire. It was established in 2001 by CEO Douglas Stewart.

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Mark Group Limited is a UK based energy advice and installation company, who focus upon energy efficiency. Mark Group went into administration on 7 October 2015.

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