Perhaps the internationals, but interstate flights can use all the other ports: Gerro, Kal, Meeka, Learmonth. A330 could carry Auckland?
Auckland, I think not! Did you mean
Adelaide?
If so, then yes, the A330 can carry ADL as an alternate for PER. We regularly do it from HKG in the winter months, but if the weather's above the alternate minima then we carry 'Island Reserve' (ie 120 minutes' holding) in lieu of an alternate. A big problem with using ADL as an alternate for PER is the lack of enroute alternates between the two. It's not so bad if Kalgoorlie and Woomera are available, but if either one isn't suitable due to weather then we have to carry much more fuel for the diversion to cater for a depressurisation/engine failure. In that event, it's not unusual to land in PER with over 20 tonnes of fuel in the tanks!