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.
All Posts
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.
AEMC communicates two items, relating to a Review of the Integrated System Plan (ISP)
Amongst the many emails that hit my inbox recently was an email from the AEMC that spoke to the ‘Package of ISP reform underway’ – and specifically these two arms.
Bruce Mountain (at NEMdev 2025) spoke to his significant concerns about the ISP
A short note to follow the NEMdev 2025 conference (Tue 7th and Wed 8th Oct 2025) and to highlight a comment made by Bruce Mountain about the ISP.
Sarah Lawley (at NEMdev 2025) spoke about what she sees as ‘circular reasoning’ in the ISP
A short note to follow the NEMdev 2025 conference (Tue 7th and Wed 8th Oct 2025) and to highlight a comment made by Sarah Lawley about the ISP.
Some suggestions for the Nelson Review panel to consider (with respect to Forecasting) following review of the Draft Report
Following my presentation at NEMdev 2025 (on 8th Oct 2025), here are some suggestions that the Nelson Review panel might consider - with respect to forecasting.
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.
Scarce use of aggregate dispatch conformance to-date
No Mixed aggregate dispatch groups have been registered.
Guest Authored Posts
24 GW in 24 months, a race against time for the NEM
Following his presentation at All-Energy in Melbourne last week, David Dixon reports on the state of the NEM's ambition to reach 82% renewables by 2030.
The implications of the Solar Sharer Offer (SSO) and Default Market Offer (DMO) review outcome on energy sellers
In this guest-authored article, Connor James explains the upcoming changes to the DMO, including the much publicised Solar Sharer Offer (SSO), and potential implications for energy sellers in NSW, SEQ, and SA.
Detailed Analysis
Case Study of 17:05 on 27th October 2022 … part 3 … (+861MW AggROT – source of AvailGen)
In Part 3 of this Case Study, we look at the source of the Dispatch Interval Availability forecasts for these units at 17:05 on 27th October 2022 (i.e. Self-Forecast or something else, incl AWEFS/ASEFS).
Why capacity factor is an increasingly over-simplistic metric
Dan outlines why capacity factor is becoming an increasingly blunt metric for comparing unit performance, and begins unpacking the technical, operational, and commercial factors that need to be considered when assessing generator performance.
Case Study of 17:05 on 27th October 2022 (+861MW AggROT for Semi-Scheduled units) … Part 1 of (an uncertain number)
In Part 1 of this Case Study, we start to look at the large collective under-performance across all Semi-Scheduled units (i.e. Wind and Large Solar) at 17:05 on 27th October 2022. More to come...
Unavailability of coal units hits 24% across calendar 2022 (but they are *not* collectively tripping more often)
This second excerpt from GenInsights 2022 Q4 Update highlights some of what's seen in terms of the performance of coal units.
Weather! The cause of.. and solution to.. all the electricity market’s problems?
Dan Lee tracks the demand forecasts against the actual outcome in QLD last Friday afternoon. The final result was as much as ∼1,000MW lower than the maximum forecast of demand published by the AEMO,...
The Generator Statistical Digest 2022 (GSD2022) is released
Following a focused effort over the past two months, we've released the updated statistical record of operations in Australia's National Electricity Market ... the Generator Statistical Digest 2022 (GSD2022)
How common are islandings and transmission tower failures in the NEM?
In light of recent events, Dan Lee does some digging to find historical incidences of islandings and transmission tower failures.
Who drove FCAS on the island
Close to $31.5M of revenue was generated in the FCAS markets in SA over the seven days that the region was frequency separated from the rest of the NEM. This follow-on from Allan O’Neil’s...