One more view of that (first results from) this week’s MT PASA data, relating to PEC Stage 2
Following this morning's article, here's one more view (via ez2view) of PEC Stage 2 in the first MT PASA solutions run.
Eventful Days
Notable volatility in ‘Market Demand’ on Wednesday 19th August 2026
A short note about some gyrations in 'Market Demand' we've seen, on Wednesday 19th August 2026.
A first look at the lengthy (double-banger) outage on the Poatina Hydro Station in Tasmania
Following a reader's comment earlier in the week, we take a first look at the major planned outage at Poatina Hydro station.
A first look at PEC Stage 2 in AEMO’s MT PASA weekly data set
I was curious to see how the PEC Stage 2 (i.e. NSW1-SA1) is being represented in the new data sets now appearing in the MT PASA process. Hence this initial view, which prompts questions.
What’s happening in ~2 weeks, with respect to development and commissioning at Kidston Pumped Hydro (or associated network)?
A conversation with a client on Tuesday 18th August 2026 coincided with me noticing the looming end to some 'zero output' constraint sets for Kidston Pumped Hydro ... so that prompts an updated view of expected operations date.
Over one month of continuous production at Tamar Valley Combined Cycle
Whilst we’re speaking about events on Saturday 15th August 2026, worth also noting that today marks over one month of ongoing production from the Tamar Valley combined cycle plant in Tasmania.
Current status of closure date for all 4 x Yallourn units
via 'Forecast Convergence' widget, we see (to date) consistent reporting to the AEMO of envisaged closure of all 4 x units at Yallourn being 1st July 2028.
Simultaneous loss of controls on two DC interconnectors (Saturday 15th August 2026)
A short article to note simultaneous loss of control on the two x DC interconnectors on the mainland for a couple hours on Saturday morning 15th August 2026.
The NEM’s AGC heartbeat failed for some a period of time (unknown currently), ending on Wednesday 12th August 2026
At 12:32:03 on Wednesday 12th August 2026, the AEMO published MN144798 which noted 'AGC Heart Beat has been resolved'. This obviously raises other questions we will be interested to learn more about...
A week later, AEMO MT PASA run shows only shortfalls in South Australia
Given the discussions about looming Yallourn closure, and the implications of this, worth noting a change in the latest weekly MT PASA run.
Interconnector metered flows (on Wednesday afternoon), and an initial sequence of events
In this 6th article relating to the data glitch triggered frequency excursion on Wednesday 5th August 2026, we take another look at interconnectors, and start compiling a sequence of events.
AEMO published final version of go-live plan for Project EnergyConnect
On 7th August 2026, the AEMO published this (final version of) the go-live plan for Market Integration of Project EnergyConnect
Instantaneous (but much smaller) drop in frequency on Friday 7th August 2026 with Millmerran Unit 1 trip
A much more 'traditional' drop in frequency on Friday morning 7th August 2026 (compared to the stranger-but-deeper drop on Wednesday 5th August 2026), with Friday's following a coal unit trip
Initial review of unit output on Wednesday 5th August 2026
Supply fluctuated but was this to an equivalent extent as the recorded interconnector flows would suggest, or the noted demand change in NSW for the 16:25 interval?
Mainland Frequency Wednesday 5th August 2026, how low and when
The nadir we measured was shortly after 16:25: 49.825 Hz, at 16:25:33.
A quick initial look (via ‘Dispatch Error’) at the Demand and Frequency drop on Wednesday afternoon 5th August 2026
A first look at yesterday's major frequency event (and demand gyration in NSW) using 'next day public' data to look at Dispatch Error
Energy Minister (Chris Bowen) announces intention to expand SRES from 100kW to 1MW
It was on Wednesday 5th August 2026 that the energy minister, Chris Bowen, announced the intention to expand the eligibility of the SRES from the current capacity limit (100kW) up to 1MW installations.
Significant drop in Mainland Frequency (Wed 5th Aug 2026) around the time of what appeared to be ‘just’ a Data Glitch
We don’t know what happened, yet - just wanted to flag the significant frequency drop here this evening so readers don’t think it was ‘just’ a data glitch.
Major change in NSW ‘Market Demand’ on Wed 5th August 2026 – ‘just’ a data glitch, or more?
A sudden drop in NSW demand was followed by apparent recovery in the next interval.
‘What’s Yallourn ever done for us?’ Part 1
For a coincidence of several different reasons, here's a quick initial overview of how Yallourn Power Station has been performing over time, and particularly in Winter 2026 ytd.