It needs to het its power from somewhere. There may be models on the market that are battery powered. If gas only, it may need a mains connection. If electrical it will probably bleed the power it needs from your supply
oresome, you could be right if wee eddie is thinking of the old ones. I am talking about 2 new meters 9mnths and the new display units which show both gas and electricity usage in multiple formats.
This still raises the question of how the gas meter talks to the electric meter if it has no power to it. It must have a battery of some kind to my mind which can't last forever and there is no means of replacing it or charging it as the whole thing is contained in a welded metal box.