Curtailment in the NEM over the period was 20GW which is 3.5% of the available Utility and Wind Generation. Curtailment imo is primarily caused by grid constraints, demand & cost of storage. The curtailment mainly occurs in the middle of the day when rooftop reduces demand and grid stability. On the 2 main curtailment periods the curtailment was 8% of Utility & Wind.
Curtailment numbers are reported here and can be downloaded for review http://nemlog.com.au/show/curtailment/today/
This is the report from the above link for the period. I have subtracted 5.5GWh for the first 8 hours which weren't in my sample.
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Snapshot May 11th, page-3
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