Frequency drop with trip of Callide B2 on Tuesday evening 28th October 2025
A short note to capture the trip of Callide B2 on Tuesday 28th October 2025 in the five minute period prior to 21:01 (NEM time) that day.
generator trip
Sharp mainland frequency drop, with trip of CPP_4 on Sunday evening 26th October 2025
The Callide C4 unit tripped from 420MW in the 5 minutes to 18:36 (NEM time) on Sunday evening 26th October 2025, delivering a sharp drop in mainland frequency.
System frequency during simultaneous trips at YWPS3 and YWPS4 on Thursday 16th October 2025
System frequency remained within the NOFB, appears well managed given the supply loss approached 600 MW.
Final incident report on the power system incident of 13th February 2024 released
In July 2025 AEMO released the final report into the review of the major power system event of 13 February 2024.
The frequency of coal generation events in 2025
A count of coal generator events indicates large unit trips are less frequent.
Loy Yang A3 offline on Tuesday afternoon 20th May 2025 – small frequency drop
A short note because of a 295MW drop in output from Loy Yang A3 just prior to 14:06 (NEM time) on Tuesday 20th May 2025.
Market Notice 121008: Three of four Uranquinty units trip during LOR1 condition
At 16:55 on 26th November 2024 AEMO advised three of four units at Uranquinty tripped, during a forecast LOR1 condition which then became an actual LOR1 condition.
Tarong North Power Station trips on Monday evening 19th August 2024
A quick contemporaneous record of the trip of the Tarong North Power station unit on Monday evening 19th August 2024.
What was the cause of the coincident trip of Eraring units 1 and 2?
It's Monday 8th April, the two Eraring units that tripped last week are back online - and I wonder what the cause of the coincident trip was?
Eraring Units Back
The two Eraring units that had tripped on Wednesday 3 April 2024 were returned to service by 11pm that evening.
Fast frequency recovery, on Wednesday 3rd April 2024
Fourth article on Wed 3rd April 2024, pertaining to the earlier coincident trip of ER01 and ER02 units at Eraring Power Station.
AEMO Market Notice 115944 about trip of ER01 and ER02
AEMO Market Notice 115944 notifies that the coincident trip of ER01 and ER02 was at 13:22 NEM time on Wednesday 3rd April 2024.
Replaying four dispatch intervals on Wed 3rd April 2024 with the ER01 and ER02 trip (Part 2)
In this second short article for the day, we Time-Travel ez2view back to 4 x Dispatch Intervals surrounding the coincident trip of ER01 and ER02 at Eraring Power Station.
Simultaneous trip of ER01 and ER02 drops mainland frequency in the NEM
A first article noting simultaneous trip of Eraring units 1 and 2 on Wednesday afternoon 3rd April 2024.
Two units at Tarong come offline Wednesday morning 28th Feb 2024 … not planned in advance
TARONG#1 has come offline from close to minimum load this morning, closely followed by TARONG#2 (also from close to minimum load) - Wednesday 28th February 2024
How fast is a trip?
Curiosity (part triggered by some conversations I noticed on social media) drove me to have a look at the implied ROCDOWN in the AEMO 4-second data for the 5 facilities (10 DUIDs) involved in...
Grid frequency on 13th February 2024
Grid frequency had dropped to 49.689 Hz. We take an initial look into the timeseries of grid frequency recorded on the day.
Victorian power system event 13 Feb 2024 13:08 – a few quick notes
Guest author, Allan O'Neil, adds some insights in a rapidly evolving situation on Tuesday afternoon 13th February 2024 in Victoria.
4 Loy Yang A units simultaneously trip, on Tuesday 13th February 2024
An unfolding story, on Tuesday afternoon 13th Feb 2024 - with all 4 x Loy Yang A units tripping.
… but Loy Yang A1 trips on Sunday 14th January 2024
A quick PS to the earlier Sunday article (which looked at LYA4) this time focused on LYA1.