Four hours of Mainland Grid Frequency, on Sunday 12th October 2025
As something we might refer back to later, here’s a 4-hour trend of NEM Mainland Grid Frequency on Sunday 12th October 2025 – from 09:00 to 13:00 (NEM time).
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.
Two-shifting again at BW02 on Saturday 11th October 2025
Worth noting that Saturday 11th October 2025 saw Bayswater Unit 2 perform the two-shift shuffle again.
Winners announced, for CIS Tender 4
One day after the conclusion of the inaugural NEMdev 2025 conference (during which the CIS was discussed), the announcement was made of the winners of the Tender Round 4 of the Capacity Investment Scheme.
The ‘Queensland Energy Roadmap 2025’ is released
Today (Friday 10th October 2025), the State LNP Government has released its ‘Queensland Energy Roadmap 2025’ as the replacement for the prior Labor Government’s QEJP.
What happens, when Supply ≠ Demand?
For short term reasons (related to the Nelson Review and the NEMDev conference) and longer-term reasons, we thought it was useful to post this as a stand-alone article now.
Aggregate (estimated) curtailment of Large Solar exceeds 70% on Sunday 5th October 2025
On the prior weekend (Saturday 4th October 2025 and Sunday 5th October 2025) we saw high levels of aggregate curtailment across all Large Solar Farms.
Also difficult to see any fluctuation in Mainland Frequency on Sunday morning 5th October 2025, with BW02 offline (two-shifting)
Not seeing any obvious blip in system frequency (at the time BW02 came offline on Sat 4th Oct 2025) we also looked at the similar outage on Sun 5th Oct 2025.
Difficult to see any fluctuation in Mainland Frequency on Saturday morning 4th October 2025, with BW02 offline (two-shifting)
I was keen to see if there was any noticeable blip in System Frequency resulting from the BW02 unit coming offline on Saturday 4th October 2025 for the brief (two-shift) outage.
Talk about two-shifting … such as with BW02 on Saturday 4th and Sunday 5th October 2025
Today's LinkedIn update from Geoff Eldridge at GPE about two-shifting at BW02 (such as on Sat 4th Oct 2025 and Sun 5th Oct 2025) coincides with other investigations, and prompts me to take a...
AEMO issues (short-notice, short-lived) direction for System Strength in NSW on Sunday 5th October 2025
A short article for Sunday 5th October 2025 to record the Direction issued for System Strength for NSW on Sunday 5th October 2025
New lowest* point for NEM-wide Market Demand on Saturday 4th October 2025?
A snapshot from NEMwatch at 10:55 on Saturday 4th October 2025, highlighting NEM-wide ‘Market Demand’ down at 9,393MW - a new lowest point?
The ENTSO-E ‘Factual Report’ on ‘Grid Incident in Spain and Portugal on 28 April 2025’ is out
Some of our readers will be interested to note that the Factual Report into the ‘Grid Incident in Spain and Portugal on 28 April 2025’ was released on 3rd October 2025.
AEMO updated MT PASA guidance, on 3rd October 2025
Worth copying in here AEMO's Market Notice 129413 published late Friday afternoon 3rd October 2025 pertaining to the coming two-year period - because of some changes and other notes.
Belatedly recording the QLD LNP’s comments about ‘coal for decades’ in September 2025
I alluded to the following comments in Wednesday’s article about the possible early closure of Gladstone Power Station … though we did not have time to note them at the time. We were not...
VP5 into the Planned part of it’s lengthy Unplanned-Planned-Unplanned outage
On my commute this morning (Friday 3rd Oct 2025), I noticed this update on LinkedIn yesterday evening from the team at Delta Electricity, speaking about their annual shutdown at Vales Point 5.
NEM Mainland Frequency wanders south as the sun sets, on Thursday 2nd October 2025
A very short article recording another instance of frequency wandering south as the sun is setting (this one on Thursday 2nd October 2025).
(3 units at) Torrens B station to remain open until mid-2028 after funding arrangement reached
Yesterday (Wed 1st Oct 2025) we had follow-on news about Torrens B, with the Premier of South Australia announcing that ‘Government negotiates energy security agreement’.
Eraring Unit 3 comes offline early Thursday 2nd October 2025 – on the (delayed) short-notice maintenance outage
Following earlier articles about the (delayed) unplanned outage on ER03, worth noting it finally came offline Thursday morning 2nd October 2025.
The Nelson Review panel ‘has identified’ the Schism
Continuing to walk through the draft Report of the Nelson Review, we see that the authors 'identified that most historic policy interventions have been incomplete' (i.e. speak to the Schism).
ABC reports ‘Rio Tinto’s Gladstone coal-fired power station could be retired early’
A very short article here from us today to point readers here to the ABC News article ‘Rio Tinto's Gladstone coal-fired power station could be retired early’ from earlier today