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.
Market Operations
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.
AEMO flags possible intervention tomorrow (Wed 15th Oct 2025) for System Strength in Victoria
Worth noting two market notices today flagging possible intervention because of System Strength issues in Victoria tomorrow (Wednesday 15th October 2025).
Small spike in Mainland Frequency, with (apparent) ~400MW trip of demand in Queensland on Tuesday morning 14th October 2025
It appears that there was some large(ish) trip in demand somewhere on the Queensland network, given the spike in frequency at ~07:28 on Tuesday 14th October 2025.
Drop in ‘Market Demand’ in QLD on Tuesday morning 14th October 2025
A short note to record a large-size drop in ‘Market Demand’ in the Queensland region on Tuesday morning 14th October 2025, as captured in this ez2view ‘Notification’ widget alert at 07:31 (NEM time).
ER03 makes its way back online, Sunday evening 12th October 2025
Given that we’ve written about that outage several times before, worth noting that Eraring Unit 3 came back online Sunday evening 12th October 2025.
An initial look at the Spot Price spike in NSW at 17:55 on Friday 10th October 2025
There was a short-lived (but interesting) price spike for ENERGY in the NSW region on Friday evening 10th October 2025. Here's a first look.
Two bouts of >2 hours of Non-Conformance at Aldoga Solar Farm on Sunday 12th October 2025
A quick initial look at two lengthy periods of Non-Conformance at Aldoga Solar Farm on Sunday 12th October, with the first period seeing large negative Dispatch Error, and a blip in system frequency.