I'm not really sure what it means - does it mean that you get a choice of whether to use gas or electric, or does it mean that perhaps for example the oven is gas and the hob is electric? I really don't know.
We've been to have a kitchen plan and we've been told that the current location of our cooker is not up to regulations (it's in a corner, next to a wall). So we have to move the electric plugs or gas around to the other side of the room. I can't work out which would be the easiest or cheapest supply to move.