With new lowest points for demand* being seen on Saturday 16th September and Saturday 23rd September then lower still on Sunday 1st October 2023 (i.e. yesterday) we have fielded some questions from people who are asking whether
For instance, on this post for 23rd September, there’s a comment by Observa as follows:
‘Saturday 30th Sept appears some rooftop solar owners in Adelaide were being curtailed-
(not my 6kW 3 phase producing 39kWhrs for the day)
A bright sunny day hitting 30 plus degrees but homes were still too cool for aircon so you could easily see why in some areas.’
(A) Isolated examples?
That comment above references this Whirlpool forum page on which people have been discussing problems they have been seeing with their own particular rooftop solar systems over the weekend just past – here’s a sample of some of the comments to which they pointed:
No doubt this is being discussed elsewhere as well…
(B) Official Sources
Back in November 2022 when SA was frequency islanded for a period of ~7 days the situation was such (i.e. without access to the ‘Keeping the Lights on Services’ provided via the Heywood interconnector) that some rooftop PV in South Australia needed to be curtailed over most of those days.
However in the case of the 16th Sept and 23rd Sept and 1st Oct 2023 are different (as those articles show) in that the Heywood interconnector is up and running and so AEMO has access to other options for contingency should some large contingency event occur in South Australia.
So from official sources:
They would be, I would think, the two official sources if something like this would happen on some sort of coordinated basis.
(C) Localised causes?
Possibly there are some issues relating to higher network voltages in particular locations tripping off individual systems … but I don’t have any real data to understand if that’s happening.
Perhaps some of our more learned readers who have access to these systems could comment?