Haverigg II – Construction
Construction started in April 1998 with the turbines being fully operational by the end of July 1998.
Each of the four turbines has a hub height of 45 metres with three 21 metre blades and a full rotor diameter of 42 metres. The turbines start to generate electricity automatically when the wind speed reaches 4.5 metres per second (m/s) and achieve maximum output at around 20 m/s. In exceptionally strong winds in excess of 25 m/s, they automatically shutdown. Each rotor initially turns at a speed of 30 revolutions per minute (rpm). Regulation is by stall and the blades are fitted with tip brakes which turn through 90 degrees which brings the turbine to a slow stop.
The electricity produced by Haverigg II flows though underground cables to a small sub-station located on the site. From the sub-station the electricity feeds into an existing electricity line for distribution to consumers in the area without the need for any new overhead lines.
The supply of electricity is sold through a 15 year NFFO contract.