Is it illegal for the property to provide the owner with details of utilities?

It is reasonable and not illegal for the property to provide the owner with the details of utilities.

Owners have the right to know and supervise the use of public parts, facilities and related sites of the property, and many communities will publicize the cost details on bulletin boards.

They should inform the residents of the monthly consumption of water, electricity and heating, and the residents in the community can always know the details of the owner's water, electricity and heating when paying the property fee. This is the legal right of the owner, and the property has no right to deprive it privately.