Yep. It's the wet season in North Queensland and sometimes there...

Yep. It's the wet season in North Queensland and sometimes there are clouds, more so in the afternoon. I looked at some days from early April 2020 and 2019 and the pattern is very similar.

This article discusses the QLD solar farm curtailment related to grid issues. No mention of Kidston being affected.

Another (earlier) article on the curtailment issue:

https://www.pv-tech.org/queensland-solar-farm-owner-expects-speedy-solution-to-system-strength-issu/

It is also possible that Kidston is required to curtail production when prices are negative - depends on its offtake agreement with the QLD Govt.