Probably the amount of energy you can get today left (not sure)
for example: you have 50 energy from yesterday and the max amount is x energy
you get to x energy today & spend it all in the estate,you still have x-50 energy you can get and that's shown there
just a guess
It's better to be silent and be thought a fool than to speak and remove all doubt. What's even better is to weaponize your words to destroy anyone who dares challenge you.