A Danish wind turbine company has built the largest wind turbines yet, designed for the rough conditions of the North Sea. This monster’s blades have a diameter of 164 metres and sweep 21,000 square metres, an area over three times the size of England’s Wembley Stadium. Their blade tips reach almost 190 metres. The power output for each turbine is seven megawatts, which will produce the equivalent of the average house’s power usage for a year in just over 30 minutes. By contrast, the biggest turbines in New Zealand – those in the Tararua ranges – produce two megawatts. Lowering the cost of energy in relation to offshore wind is essential for the industry. Some of the major stepping stones in achieving this are size and subsequent increased energy capture, which means a need for much bigger turbines that are specifically designed for the challenging offshore environment.