ZWave switches when HA is off

I will have zwave switch relays to control lights and outlets.

If HA will be off, am I be able to control lights and have energy in outlets?

Yes,.

[Padding because of the stupid forum minimum post length].

For instance, if I turn off lights or turn off outlets on HA and then HA stop working, wii I be cut off from power with no ability to access power?