Orkney used to be a study in how to use energy unsustainably. The island system off the northern tip of Scotland bought and imported all its power from coal and gas plants on the Scottish mainland. These days it generates more electricity than it needs via a host of wind turbines. Author Laura Watts has studied the sustainable energy revolution taking place on the far-flung islands. She believes Orkney provides a template that could be put to use elsewhere in the world – including windy New Zealand locations like Stewart Island or Wellington.