The power cables are connected to the control box. If it is a 15 amp spa then you will have a three meter lead from the control box that gets plugged into a 15 amp power point.
If your spa is 32 amps or higher, then it will need to be hardwired by an electrician into the control box. The control box on all vortex spas is located on the touchpad side of the spa or swim spa. For swim spas the power is located on the short side of the spa end (Opposite the swim jets).