Generally hookups are for caravans- if you are in a tent you are not likely to be given a pitch close to a hookup!!
However- having said that -it all depends on the camp site. Some have dedicated pitches- some you just pile in where you can fit. The one I was on in Cornwall was a basic field with loos and shower block. One electric hookup point on one side of the field. Wasnt particularly busy - you could have pitched a tent within a couple of metres of it. If you were unlucky you could have pitched 50 yards away.
I would make up a lead of ten metres or so. Then I would make up an extension lead of around 20 metres and salt that away just 'in case'