It has nothing to do with the wet season, just that the entire generation capacity is fully enabled where up to now it has been brought online in stages.
Regarding the wet season: - Kidston is in a pretty dry area so except when the monsoon trough reaches down that far generation is still likely to be pretty substantial.
Go to this page and deselect all of the power stations except Kidston (KSP1) and you'll see that on most days production has reached close to the current maximum output (32 MW) at some point in the day (I believe the graph is plotting 30 minute intervals).
GNX Price at posting:
29.0¢ Sentiment: Buy Disclosure: Held