Moving Out

I have declared in my account that I’m moving out of my current apartment on 18th Aug. My question is what will happen after 18th? Will Bulb still be the energy supplier of the apartment? If yes, on whose name the following bills will be charged?

The name will be either the new tenant, or if there isn’t one, the landlord or their declared representative. Basically, whoever becomes legally responsible for the apartment becomes legally responsible for the bills.