Bonus has installed its 1 MW prototype wind turbine at Tjærborg Enge for utility Vestkraft, which also owns Nordtank's and Vestas' 1.5 MW units on the same site. Together with Elsam's 2 MW turbine the four machines will be run side by side in an assessment of the potential of megawatt scale wind power. The Bonus 1 MW replaces the company's 750 kW unit which disintegrated last year due to a construction fault in the rotor bearings. The new turbine has a hub height of 50 metres and 27 metre blades; the Nordtank unit, installed in autumn last year, has a hub height of 50 metres and 30 metre blades, while the Vestas unit, installed in the winter, rises 60 metres above the ground, with 31.5 metre blades. Together with the 2 MW unit the turbines are expected to generate 13,400/MWh a year -- enough electricity for about three thousand households.