This report presents results from the monitoring program on harbour porpoises conducted at Nysted Offshore Wind Farm during the period 2001-2005. The study was commissioned by Energy E2 A/S and financed by the Danish Energy Authority (Energistyrelsen). This is the annual report for monitoring in 2005 and at the same time the final report of the monitoring program of harbour porpoises at Nysted. All collected data is thus included in the analysis and this report thus succeeds and replaces annual reports of the previous years. However, some of the technical details and especially the development and justification of the experimental methods and analyses used may require that previous reports are consulted.