The invention relates to a device for generating electrical power, wherein the device (3) is adapted to be installed in connection with a building or a construction provided with at least one first gas source (7a, 7b, 7c, 7d) adapted to provide at least one first gas stream, wherein the device comprises a gas turbine (13) adapted to receive at least a part of the at least one first gas stream (9) from the at least one first gas source and to convert at least a part of the kinetic energy of the gas stream into electrical power. The invention also relates to a system installation comprising such a device and a method of converting wind into electrical power with such a device.