Interesting that Karsthuntr indicates 10 feet in his area.
Here in Manitoba the online Dept of Labour gas regulation notices since 2001 have specified a minimum clearance radius of 3 feet from anything that is electric (a/c units, plugs, outside electric meters, etc.) and that is measured from the vent on the regulator not the meter.
I have seen a few older residential installations where the gas company has added a piped extention to the regulator vent to add clearence in special situations
Check with your local gas utility to see what the requirements are.