Frequency wobbles on Thursday afternoon 30th October 2025
A short article highlighting some frequency wobbles on Thursday afternoon 30th October 2025.
Eventful days in 2025
A catalogue of articles pertaining to eventful days in 2025
Direction for System Strength in NSW again–on Thursday 30th October 2025
In a repeat of yesterday, the AEMO has again directed for System Strength in NSW on Thursday 30th October 2025.
Another direction for System Strength in NSW (on Wednesday 29th October 2025)
It's day 1 of All Energy 2025 today (Wednesday 29th October 2025) , and the day will have already started - but I thought it would be topical to note another direction for System...
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.
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.
Two *big concerns* that we urge the Nelson Review panel to (re)consider (with respect to Invisible Responses) following review of the Draft Report
With All Energy happening this week in Melbourne, plus the clock ticking down on preparations at the Nelson Review Panel for their final report, I've reached back to the NEMdev conference to write about...
Selected 4-second data relating to the (SemiSched-induced) frequency weakness on Thursday 16th October 2025 (i.e. Part 4)
In Part 4 of this evolving Case Study, we take a closer look (using 4-second data) at the 12 x offending Semi-Scheduled units that appear to have played a large role in driving frequency...
A hot afternoon in NSW on Wednesday 22nd October 2025 (but the price did not pop … at least to 14:15)
A short article looking at the NSW region in early afternoon Wednesday 22nd October 2025.
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).
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.