Just the one. The closer to the photobooth the better. We will liaise with the venue regarding power before your event and we always have extension leads with us. If the plug socket is further than 15 metres away from the booth, we’ll bring our extra long extension cable 🙂 If your event is in a marquee, we would much prefer to get power from the main building if possible. Generators can sometimes cause problems if there are power fluctuations.