Collectively, a number of us across Global-Roam Pty Ltd* had each seen the early afternoon volatility in NSW
* coincidentally, we’re celebrating 25 years of service to clients across the NEM!
1) Whilst I had been posting some initial thoughts under ‘Early afternoon volatility in NSW, on Wednesday 15th January 2025 … Part 1 in a multi-part exploration’
… this was published at 14:37 NEM time, so ~41 minutes after the SMS alerts started to ping.
2) There’d been some chatter on an internal Slack channel (linked here, for our future reference).
What I’d missed was several updates from the AEMO whilst posting the article:
1) Secondly*, but noting it first, we’d missed MN123273 as follows:
‘——————————————————————-
MARKET NOTICE
——————————————————————-
From : AEMO
To : NEMITWEB1
Creation Date : 15/01/2025 14:28:14
——————————————————————-
Notice ID : 123273
Notice Type ID : INTER-REGIONAL TRANSFER
Notice Type Description : Inter-Regional Transfer limit variation
Issue Date : 15/01/2025
External Reference : Inter-regional transfer limit variation – Lower Tumut – Yass 330 kV 03 Line – NSW region – 15/01/2025
——————————————————————-
Reason :
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation – Lower Tumut – Yass 330 kV 03 Line – NSW region – 15/01/2025
At 1358 hrs 15/01/2025 there was an unplanned outage of Lower Tumut – Yass 330 kV 03 Line.
The following constraint set(s) invoked at 1400 hrs 15/01/2025
N-X_LTYS_MNYS
This constraint set(s) contains equations with the following interconnectors on the LHS.
VIC1-NSW1,N-Q-MNSP1,NSW1-QLD1,V-S-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
——————————————————————-
END OF REPORT
——————————————————————-’
2) Just over 30 minutes before I published the Part 1 article above, and also prior to the Market Notice from the AEMO, some copies we have of ez2view running to evaluate ‘Notification’ alerts in real time were warning us of the invocation of the ‘N-X_LTYS_MNYS’ constraint set as follows:
Searching for that constraint set within ez2view pops up the following with a somewhat noteworthy invocation history … 10 minutes in 2025 and ~4 days in 2022 but not otherwise:
Note that:
1) This covered the 14:05 and 14:10 dispatch intervals (NEM time) … so not the price spike at 14:00 noted in Part 1
… though probably complicating things further in the next 2 dispatch intervals.
2) But importantly noting that there were two different 330kV lines out during this period:
(a) The Line 5 (Marulan to Yass 330kV) noted in Part 1
(b) The Line 3 (Lower Tumut to Yass 330kV) that tripped, in the Market Notice above.
More to come, in subsequent parts.
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