Morning volatility in the southern regions – Thursday 26th June 2025
Here’s a snapshot from NEMwatch at 07:25 to record some morning volatility on Thursday 26th June 2025
Articles by Paul McArdle
Paul was one of the founders of Global-Roam in February 2000. He is currently the CEO of the company and the principal author of WattClarity. Writing for WattClarity has become a natural extension of his work in understanding the electricity market, enabling him to lead the team in developing better software for clients.
Before co-founding the company, Paul worked as a Mechanical Engineer for the Queensland Electricity Commission in the early 1990s. He also gained international experience in Japan, the United States, Canada, the UK, and Argentina as part of his ES Cornwall Memorial Scholarship.
Opaque Congestion and Hidden Curtailment … such as on Tue 24th June 2024 with the ‘N-DPWG_63_X5’ constraint set invoked
It was now just over 5 years ago when Marcelle wrote ‘Not as simple as it appears – estimating curtailment of renewable generation’. This week's invocation of the 'N-DPWG_63_X5' constraint set provides a great...
Loy Yang A2 apparent trip from 443MW on Wednesday 25th June 2025
A very short midday article on Wednesday 25th June 2025 noting this apparent trip of LYA2 unit from 443MW just prior to 11:31 (NEM time).
ENTSO-E is also investigating the 28th April 2025 blackout on the Iberian Peninsula
For those interested in ‘what happened, why and what should be done about it’ with respect to the 28th April 2025 blackout on the Iberian Peninsula, ENTSO-E is also investigating.
Unplanned outage of Darlington Point – Wagga No.63 330 kV line
At 17:44 yesterday (Monday 23rd June 2025) the AEMO issued MN127743 noting an unplanned outage of Darlington Point - Wagga No.63 330 kV line (leading to the ‘N-DPWG_63_X5’ constraint set being invoked)
A 409MW drop in ‘Market Demand’ in Victoria on Tuesday 24th June 2025
Another short article about a large change in demand – this one being a 409MW drop in ‘Market Demand’ to the 12:10 dispatch interval (NEM time) on Tuesday 24th June 2025.
Forecast LOR3 for South Australia for Monday 30th June 2025
Beginning Monday evening 23rd June 2025, the AEMO has forecast extremely tight supply-demand balance in South Australia (including possible load shedding) for Monday 30th June 2025.
New all-time record for NEM-wide wind, on Monday 23rd June 2025
We see a new record for NEM-wide wind production was set at 22:35 (NEM time) on Monday evening 23rd June 2025, with aggregate FinalMW reaching 9,491MW.
Red Electrica report on the “Blackout in Spanish Peninsula Electrical System on 28th of April 2025”
On Wednesday 18th June 2025 Red Eléctrica (REE) published on the “Blackout in Spanish Peninsula Electrical System on 28th of April 2025” .
‘June 12 was one of the most challenging days of the last 4 years’
It was with interest that one of our team members noted David Osmond’s comment earlier today when he said 'June 12 was one of the most challenging days of the last 4 years ...'
A dose of evening volatility across the mainland, on Wednesday 18th June 2025
Here’s a snapshot from NEMwatch at 17:35 on Wednesday 18th June 2025 as food for further discussions at 'Energy Week' in Melbourne tomorrow.
The Non-Confidential Report (182 pages) into the Iberian blackout
Earlier today we wrote about the ‘News Release on the blackout on the Iberian Peninsula...’. Here's the report (which we could not find at the time).
News Release on the blackout on the Iberian Peninsula (on 28th April 2025) suggests overvoltage was the cause
On Tue 17th June 2025 (local time) a news release has been made to suggest a report into the April 2025 power outage on Iberian Peninsula has been released.
Frequency wobbles on Tuesday 17th June 2025
A quick look at two particular instances of (relatively small) frequency disruption on Tuesday 17th June 2025.
Which units show large positive Dispatch Error for 15:40 on Monday 16th June 2025
Following on from Linton's article (about the frequency drop at 15:40 on Monday 16th June 2025) we take a look at the largest harmful Dispatch Errors across the full fleet of units ... and...
Three units at Yallourn Power Station offline on Monday morning 16th June 2025
Taking a look at the three of the Yallourn Units offline on Monday morning 16th June 2025.
Trading Places … BW01 offline, with BW04 online
With BW04 returned to service on Sat 14th June 2025, worth noting that sibling unit BW01 came offline on Sunday afternoon 15th June 2025.
What’s all this, then, about Gas-Powered Generation in Victoria in the past week
Over the past week (and particularly Wednesday 11th June 2025 and Thursday 12th June 2025) gas-power generation ran strongly in Victoria. So we take a quick look at the historical context.
AEMO ‘Industry Go Live Plan’ for ERI and ST PASA Recall Period
Belatedly noting the AEMO's publication of the Industry Go Live Plan for the ERI and ST PASA changes.
AEMO publishes Draft Report (Security Enablement Procedure – Improving Security Frameworks)
Yesterday (Friday 13th June 2025), the AEMO published both a Draft Report, and Draft Procedures for Security Enablement (as part of the ISF changes in 2025)