EXCAVATOR

A shovel according to embodiments of the present invention includes a lower travelling body (1), an upper swivel body (3), an operation attachment, an engine (11), a motor generator (12) which is connected to the engine (11), a hydraulic pump (14) which is connected to the motor generator (12) and supplies hydraulic oil to the operation attachment, a swiveling electric motor (21) which is mounted on the upper swivel body (3), a power storage device (19), a DC bus (110) which electrically connects the power storage device (19) and the swiveling electric motor (21) to each other, and a control device (30), in which the control device (30) decreases a charging/discharging limit value of the power storage device (19) and changes a discharging requirement value which is the maximum value of power which is supplied from the power storage device (9) to the swiveling electric motor (21), according to a decrease of temperature.