Electrostatic potential is in what units?

Hello,

I realise that this is a basic question, however it is important that I confirm this.

Within DMol3 in Modelling studio, there is the option to analyse the Electrostatic potential. After making a calculation, this electrostatic potential is written into a .grd file.

Since the usual method of measuring Electrostatic potential is in Volts, my first assumption is that the units of the grd file are Volts, however I can not find anywhere where this is written. Can anyone point to some information declaring what the units of this are?

Any assistance would be very greatly appreciated, since I really am out of ideas of where to look.

Many thanks,

James