[bmazed]

you can ask for there to be an emergency option or key that may not be electric based in the exits of the building...if they can place an axe inside glass they surely can place emergency keys

[Sebguer]

The doors are generally automatically unlocked when going from inside to out, power or no power.

[BlueTemplar]

Not in my case, have to push a button for going out !

Speaking of which, we are expecting (regular ?) power cuts this winter, I think the doors should automatically unlock during one, but I should check with the agency...