WeatherWatch notes ‘Cyclonic Conditions for Victoria, Widespread Gales Across NSW & Areas of South Australia’
A short note (on Wednesday morning 22nd October 2025) about the Severe Weather warnings (from WeatherWatch, and then from AEMO).
Eventful Days
Taking a first focused look at the 16:50 dispatch interval on Thursday 16th October 2025 (with frequency dropped below NOFB) … Part 3
In Part 3 of this series with respect to Thursday 16th October 2025, we focus on when a large collective under-performance across all Semi-Scheduled Wind Farms and Solar Farms dragged the frequency outside the...
Unplanned outage of Dapto – Marulan (8) 330 kV line
At 07:55 (on Monday 20th October 2025), an unplanned outage of Dapto - Marulan (8) 330 kV line led to the unplanned invocation of the 'N-DTMN_8_15M' constraint set.
Spicy prices forecast for NSW on Monday afternoon/evening 20th October 2025
A quick note, on Monday morning 20th October 2025, showing the re-emergence of price forecasts up near the Market Price Cap for a 90-120 minute period this afternoon/evening.
Forecast Minimum System Load for Victoria next Saturday 25th October 2025
A short note to flag MN129813 looking forward to next Saturday 25th October 2025, flagging possible MSL1 in Victoria.
Considerable uncertainty, with respect to what might unfold in NSW next Wednesday 22nd October 2025
Following a series of Market Notices from AEMO with respect to forecast LORx conditions for NSW next Wednesday 22nd October 2025, we take a first look.
Price spike in NSW (and QLD!) at 14:55 on Friday 17th October 2025
A very quick article to record the price spike (for ENERGY) in the NSW region at 14:55 earlier today (Friday 17th October 2025) ... and Contingency Lower in QLD.
How the NEM BESS fleet is operating on peak days, and how to be a savvy operator
In this guest article, Matt Grover from Fluence draws on operational data and real-world trading experience to unpack how Australia’s grid-scale batteries performed across three June 2025 peak days — and what capabilities belong...
Peeling the second layer of the onion, with respect to the (SemiSched-induced) frequency weakness on Thursday 16th October 2025
Having already noted the ‘Weakness in frequency stability on Thursday afternoon 16th October 2025’, we take a look at the causes - for the four high-profile dispatch intervals.
Aldoga Solar Farm on Sunday 12th October 2025 – Part 2
In this article we inspect power deviations from dispatched units that would have contributed to the frequency rise, and the deviations that would have contributed to the correction.
Weakness in frequency stability on Thursday afternoon 16th October 2025
The worst periods of frequency stability on Thursday 16th October 2025 were *not* with the simultaneous trip of YWPS3 and YWPS4, but rather later and the day - and look similar to patterns seen...
Both YWPS3 and YWPS4 back online overnight
A quick follow-on early Friday morning 17th October 2025 to note that both YWPS3 and YWPS4 made it back online overnight.
Differing return to service expectations for YWPS3 and YWPS4, following simultaneous trips
Following the simultaneous trips (on Thu 16th Oct 2025) of YWPS3 and YWPS4, we take a look at current return to service expectations.
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.
After Yallourn units trip, AEMO again issues directions to Jeeralang Power Station, for System Strength in Victoria
Following the simultaneous trip of units at Yallourn, directions to Jeeralang Power Station were issued for maintaining System Strength in Victoria.
Simultaneous trips at YWPS3 and YWPS4 on Thursday 16th October 2025
A short note on Thursday 16th October 2025 to record both Yallourn Units 3 &4 tripping during the 13:35 dispatch interval (NEM time) today.
Short-notice outage at Loy Yang A4 in Victoria on Wednesday 15th October 2025
At 09:06 (NEM time) this ‘Notifications’ widget alert from ez2view flags Loy Yang A4 coming offline ... which helps explain the directions for System Strength.
AEMO notes ‘Non-credible contingency event’ at Jeeralang
No sooner had we noted that ‘AEMO changes mind, and directs Murray instead (to run as syncon) for System Strength in Victoria on Wednesday 15th October 2025’ then we receive MN129618 at 09:00 that helps...
AEMO changes mind, and directs Murray instead … but this was also short-lived?!
Less than an hour after directing Jeeralang (for System Strength in Victoria), AEMO changes its mind and directs Murray instead. Though this was also short-lived!
AEMO issues directions to units at Jeeralang Power Station, for System Strength in Victoria (Wednesday 15th October 2025)
As AEMO had telegraphed yesterday, just after 08:00 (NEM time) on Wednesday 15th October 2025, the AEMO issued Directions to various units at EnergyAustralia’s Jeeralang Power Station for System Strength in Victoria.