A closer look at NEM Mainland Frequency (at 100ms cadence) on Thursday afternoon 13th February 2025 (i.e. Part 2)
Some recent questions prompted this more granular look at NEM Mainland Frequency on Thursday afternoon 13th February 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.
A curious case of UIGF for Hamilton Solar Farm on Wednesday 12th February 2025 (Part1)
Here’s a first look at (generating lots of questions about) Hamilton Solar Farm, and particularly the Availability forecast, back on Wednesday 12th February 2025.
Large (+405MW) jump in ‘Market Demand’ in NSW on Thursday 20th February 2025
A second article for Thursday 20th February 2025 looking at a noticeable jump in ‘Market Demand’ in NSW
A curious case of some ‘rogue’ sky-high P5 price forecasts for NSW on Thursday 20th February 2025
A short (and perhaps cryptic, or perhaps useful) initial look at some (what might appear to some) ‘rogue’ price forecasts in P5 predispatch for the NSW region on Thursday 20th February 2025.
AER published ‘Semi-Scheduled Generator Compliance Bulletin’ on Tuesday 4th February 2025
Two weeks after the AER published its updated Compliance Bulletin (and Compliance Checklist) for Semi-Scheduled units, we’ve finally found time to note about it.
Second big drop in ‘Market Demand’ in NSW on Wednesday 19th February 2025
About 150 minutes after the earlier (apparent) drop in NSW ‘Market Demand’ there’s a second drop that’s not quite so big, but still sizeable.
Callide B2 (apparent) trip early on Wednesday morning 19th February 2025
Whilst looking at system frequency, there was an apparent trip of the Callide B2 unit in the early hours of Wednesday morning 19th February 2025.
741MW (apparent?) drop in ‘Market Demand’ in NSW on Wednesday midday 19th February 2025
That alert in ‘Notifications’ widget in ez2view (looking at large change in ‘Market Demand’ in NSW) has triggered again at 11:51 (NEM time) on Wednesday 19th February 2025.
Large instantaneous jump in ‘Market Demand’ in NSW on Tuesday afternoon 18th February 2025
A relatively large jump in ‘Market Demand’ in the NSW region from 16:05 to 16:10 on Tuesday 18th February 2025 caught our attention.
Reviewing LGC creation at Codrington Wind Farm over ~24 years
With the news that Codrington Wind Farm (one of the first in the NEM) is to be closed, we take a quick look at 24 years of history.
Curtailment of Large Solar reaches ~72% (NEM-wide) on Sunday 16th February 2025
Given the situation that unfolded on Sunday 16th February 2025, we take a look at curtailment of Large Solar production (not quite a record).
New lowest-ever* point for NSW ‘Market Demand’ on Sunday 16th Feb 2025 was lower than AEMO’s earlier forecasts
Second article pertaining to the remarkably low level of ‘Market Demand’ in NSW on Sunday 16th February 2025.
‘Lowest ever*’ point for ‘Market Demand’ in NSW crashes lower, on Sunday 16th February 2025
The bottom has dropped out of the ‘record minimum demand’ point for NSW on Sunday 16th February 2025.
NEM Mainland Frequency wandering (somewhat more than ‘normal’) on Thursday afternoon 13th February 2025
A quick note with snapshot taken at ~15:11 on Thursday 13th February 2025 looking back at the past 6 hours of NEM Mainland Frequency.
An initial walk through contributions in South Australia on Wednesday 12th February 2025 (i.e. Part 1)
If I had time, we’d explore three separate questions we have about what happened in South Australia on Wednesday 12th February 2025. In this article we take a first pass at one of those questions … what was the state of play in terms of contributions to meeting the very high level of demand?
Spare capacity in South Australia drops below 100MW on Wednesday evening 12th February 2025
A follow-on article focused on the 19:00 dispatch interval on Wednesday 12th February 2025 in South Australia (a very tight period for supply-demand balance).
‘Market Demand’ soars in South Australia on Wednesday evening 12th February 2025
Tuesday 12th February 2025 is seeing very high levels of ‘Market Demand’ into the evening in South Australia.
Whiplash abated … market oscillations stopped on Wednesday afternoon 12th February 2025
Following an earlier article (on Wednesday morning 12th February 2024) we note the end of oscillations related to the newly composed ‘N-BU_330_TX_ONE’ constraint set for an outage related to Project Energy Connect.
A trend of daily peak SA ‘Market Demand’– from 1st January 2008 to 11th February 2025
With respect to forecasts for peak South Australian ‘Market Demand’ in summer 2024-25 (and particularly with expectations of high demand on Wed 12th Feb 2025) we’ve provided this article as some context.
Whiplash from yo-yo-ing prices (and hence targets etc) on Wednesday morning 12th February 2025
Wednesday morning 12th February 2024 sees rapid and large oscillations in prices across all regions – which results from (and/or leads to) oscillations in output of many units. One of the contributing factors is suspected to be the newly composed ‘N-BU_330_TX_ONE’ constraint set for an outage related to Project Energy Connect.