Electricity company CLP Power has warned its Lantau customers to be aware of deceptive phone calls.
The warning comes after the company received numerous enquiries at the weekend of a pre-recorded phone message purporting to be from CLP Power.
The bogus message informed customers of abnormalities with accounts or outstanding payments.
The hoax messages informed customers their electricity supply would be terminated within two hours because CLP had been acquired by another company.
CLP Power has alerted customers the messages are false and that CLP Power would not contact customers with such a pre-recorded message if there was to be a planned power outage.
CLP said when customers were informed in writing when outages were planned.
In the case of an emergency which might disrupt supply, a duty engineer would call the customer directly depending on the specific situation.
CLP said the matter had been reported to police.
It urged customers to be on the alert and not share any personal data with suspect callers.