The long-awaited official investigation into SkyCity Entertainment Group's controversial $350m international convention and exhibition centre is out tomorrow afternoon.

The Office of the Auditor-General said today it would publish its report into the Ministry of Economic Development's expressions of interest process for proposals to establish an international convention centre.

It said it was notifying people 24 hours in advance and the report would be made public on its website.

The terms of reference for the inquiry are here.