More of a simple suggestion that doesn't have to be implemented for it to be used.
Basically we could follow this way of naming EU amounts:
EU = 1 EU
kEU = 1000 EU
mEU = 1000 kEU / 1Million EU
gEU = 1000mEU/ 1Billion EU
tEU = 1000gEU/ 1Trillion EU
Pronounced Killa-EU, Mega-EU, Giga-EU and Terra-EU respectively. It would be handy for these to be implemented into ingame GUIs (eg once the BatBox is storing >2000 EU it would use kEU instead).
Out of interest does anyone have a gEU or tEU of power stowed away???