Sharing 7 of the ‘Headline Questions’ we’re pondering, as we bury ourselves in the data surrounding the events that happened on Tuesday 25th May … some of which will have long-lasting implications (not to mention detailed investigations).
Part 5 in an expanding series, looking at what happened in QLD on Tuesday 25th May 2021 – this one looking at system frequency.
First update, day after the event, shows a cautious (initial) approach to returning the 4 units at the Callide site back to service.
Third short article this evening, after it looks like we’ve escaped from a tight supply/demand balance (reasonably) unscathed.
Looks set to be a very tight supply/demand balance this evening in Queensland. Here’s hoping everything goes right for the AEMO Control Room!
A quick snapshot from NEMwatch at 14:20 today highlighting the loss of approximately 2000MW of demand this afternoon – dropping the level of Scheduled Demand down to 3,775MW: The AEMO Market Notice highlighted says: ——————————————————————- MARKET NOTICE ——————————————————————- From : …
More time has elapsed since ‘Part 3’ on 24th March – today I’m posting a shorter piece (Part 4) that explains how RHS of the ‘Q>>NIL_CLWU_RGLC’ constraint equation drove down output and led to the price spike on Sunday 24th January 2021.
It’s taken a while to find the time – but today I’m posting this next analytical piece (Part 3) that seeks to understand what happened on Sunday 24th January 2021 with the NEM-wide SCADA Failure, which contributed to the price spike that occurred in QLD by virtue of what it did to the ‘Q>>NIL_CLWU_RGLC’ constraint equation.
Two months ago prices spiked in QLD on a Sunday afternoon when AEMO lost SCADA data feed. One month ago AEMO published a preliminary report. In the background we have been taking a look…
It was forecast it would be a hot day in the southern part of the NEM and it did not disappoint. The hot weather was one of the factors that contributed to price spikes … in Regulation FCAS, and then in QLD and later in South Australia.
In part 5 of this expanding Case Study of the unexpected price spike on Tuesday 13th Oct, linked to a large & sudden drop in output across 10 solar farms, we take a detailed look at the constraint set ‘Q-BCNE_821’ invoked to deal with the transmission outage between H11 Nebo (in ‘North’ zone) and H10 Bouldercombe (in ‘Central-West’ zone)
UQ’s Andrew Wilson pens a case study on the market events that occured on Tuesday the 13th of October in the QLD region, in which he examines the relative performance of UQ’s 1.1MW behind-the-meter battery during this period of market volatility.
In part 4 of this expanding Case Study of the unexpected price spike on Tuesday 13th Oct, linked to a large & sudden drop in output across 10 solar farms, we take a quick look at what happened at most of the QLD generators through this 10:00 trading period.
In part 3 of this expanding Case Study of the unexpected price spike on Tuesday 13th Oct, linked to a large & sudden drop in output across 10 solar farms, we dig deeper to explore… including wondering whether it would have been expected in advance.
Based on some preliminary analysis of the Powerlink’s ‘Qdata’ set (available in ez2view) we present our current hypothesis as to the sequence of the events yesterday in the QLD region, where 600MW of solar generation was lost, causing the price to spike to MPC.
Alerted to a price spike at 09:45 this morning in the QLD region, we discovered some reduction in load (spot-exposed Demand Response probably) and also a large collective trip in Solar Farm output (reasons unclear).
In order to help us (internally) map out all the different threads to explore in terms of what happened on Friday 31st January 2020 on a remarkable day in the NEM, I’ve identified a few of the key threads here over the weekend. More articles to follow as time permits….
With the benefit of more data available today, can piece together why there was the sudden drop into LOR2 territory on Saturday 1st February 2020 (something that alarmed me, and resulted in AEMO directing a participant to make capacity – just withdrawn – available again).
I’ve snuck into the office on Saturday to start the process of piecing together some of of the different aspects of what happened yesterday to follow on from Friday evening’s short article (this will take quite a while to do…
Today (Fri 31 January 2020) saw NEM-wide demand reach levels never seen before (excepting 29th January 2009). This was just the start of the white knuckle ride.