Sustainable water and power company Solco Ltd has appointed Dermot Patterson as chief executive officer to replace Duncan Stone. Prior to joining Solco, Mr Patterson was chief executive of Medec Ltd and spent 20 years with Huntleigh Technology Ltd, a large UK-based international healthcare firm. The company has also announced a re-structure of its business into seperate water and power divisions. It has appointed Michael Starling as general manager of the Water Division, and John Cooper, who has been acting in the role of chief executive, will become general manager of the Power Division.