answer: #Person2# tells #Person1# there's been a power cut and it will return at 8:30.
documents: #Person1#: Hello.
  #Person2#: Hello. Can I help you?
  #Person1#: Yes, I want to know why there's no electricity.
  #Person2#: Sorry, Sir. There's been a power cut.
  #Person1#: Well, when will it come on again?
  #Person2#: It's usually off for about half an hour, so we expect it back at eight thirty.