The present invention relates to a propulsion arrangement for a marine vessel (1), which propulsion arrangement comprises an internal combustion engine (2), a shaft arrangement (3) and a steerable thruster unit (4). The marine vessel (1) further comprises an electric generator (51) or a combined electric generator and motor in connection with the propulsion arrangement. In order to reduce space requirements and required equipment as well as to raise efficiency, the shaft arrangement (3) comprises a main shaft (31) extending from the internal combustion engine (2) to a first angle gear (32) and a drive shaft (33) extending from the first angle gear (32) to a second angle gear (34) in the steerable thruster unit (4). The electric generator (51) or the combined electric generator and motor is connected to the drive shaft (33) of the shaft arrangement (3) after the main shaft (31) and the first angle gear (32) connected thereto.