Status and experience with the 2Mw Wts 75 at N¿¿Sudden, Gotland

The installation of two full-scale prototypes represents the major part of the Swedish wind-energy programme. The 2MW WTS 75 at N¿¿sudden is one of these installations. In the paper, the time schedule and presents status of this project is reported. WTS 75 is a two-bladed horizontal-axis upward machine with full-span pitchable blades. It is built for fully automatic and unattended operation and is designed for 30 years service life. A summary of essential performance characteristics and main data are given. The design concept and build up of different subsystems are described. Shop assembly and testing of components as well as testing of the complete assembled nacelle are described. Furthermore, methods applied for construction of tower foundation are shown. Lifting and installation of nacelle and turbine to the tower top are described. Finally a summary is given of activities during first operation, acceptance tests and full-scale evaluation.