A tethered UAV (102) is disclosed. The UAV (102) may carry a payload (104). The payload may include camera, radio mast, or sensors. Power supply to the UAV (102) via a tether cable (108) from a ground station (106) may be varied using a reconfigurable power converter. Further, the UAV (102) may enter an autopilot mode based on a disruption of power supply from a power source at the ground station (106), low energy level of the power source, and a temperature of the power converter. In the autopilot mode, power may be supplied to the UAV (102) from an on-board battery and wireless communication may be initiated between the UAV (102) and the ground station (106) via a network (110).