Owned by the Sir Robert McAlpine family trust, Hertfordshire-based RES develops, constructs and operates renewable energy projects worldwide. Last year, it sold its Japanese division to Australian investment firm Macquarie for an undisclosed sum to complete the restructuring of its operations begun in 2016. Under chief executive Ivor Catto, 51, turnover grew 17% to £886m in 2017 as the group built more sites in America and sold a number of UK developments.
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