Wind energy activities in the UK have so far concentrated on comprehensive studies of system integration aspects and a detailed assessment of offshore wind energy systems. There is particular interest in offshore systems, which could provide a significant proportion of Britain's electricity needs. Many small wind turbines have been built and tested, but the design and construction of large wind turbines has proceeded more slowly. However, two industrial groups are developing large wind turbines, one horizontal axis and one a novel vertical axis design, with Department of Energy support. The first UK multi-megawatt wind turbine (3 MW rated, 60-metres diameter, horizontal axis) will be operational in 1984/85, with several medium-sized wind turbines (20–25-metres diameter), due for completion in 1982 and 1983. Electricity utilities in the UK are showing considerable interest in the use of wind energy and are participating actively in developments.