A couple SMS alerts triggered by ez2view alerted me at 14:39 (NEM Time) on Saturday 19th April 2025 to coincident trips of both units at New England Solar Farm communicated by AEMO via MN126958 as follows:
‘——————————————————————-
MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 19/04/2025 14:39:05
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Notice ID : 126598
Notice Type ID : POWER SYSTEM EVENTS
Notice Type Description : Emergency events/conditions
Issue Date : 19/04/2025
External Reference : Non-credible contingency event – NSW region – 19/04/2025
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Reason :
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event – NSW region – 19/04/2025
At 1351 hrs the Uralla – New England Solar Farm No.1 330/33 kV Transformer and New England No.2 Solar Farm tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
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END OF REPORT
——————————————————————-’
A little later in the afternoon, in checking our 2-hour trend from the live frequency reading from the Mainland NEM (measured in Brisbane at 0.1second cadence) shows a drop that appears to* coincide with the disruption:
* note that the default chart is pretty coarse in terms of what it shows, looking backwards. Perhaps later we’ll extract the raw data and trend, to see precise times and stats.
We can see the coincident trips of both NEWENSF1 and NEWENSF2 in the 5 minute period ending 13:55 (NEM Time) in the two copies of the ‘Unit Dashboard’ widget in ez2view here:
We can see that the total loss of supply was 349MW … about the size of a coal unit trip.
There was an earlier ‘drop to 0MW’ at NEWENSF1 at 09:40 that has not been investigated.
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