There are some intriguing differences between battery (bidding and) operations during the recent spell of low wind in South Australia (late July 2026) and what happened in late June 2026.
On slide from the Endgame seminar today in Brisbane focused on the recent 4-day wind lull in South Australia. Many points resonated, but I want to flag just two ...
Guest author Franz David Schaefer digs into the potential "battery correlation penalty" flagged on this site, running a three-year, per-unit analysis of every NEM battery against a perfect-foresight benchmark — finding batteries may be bidding up their own midday charging costs.
Guest author, Allan O'Neil, goes into some detail of exploring the various factors contributing to the price volatility in South Australia that bookended the night of Sunday 21th June into Monday 22nd June 2026.
I assume a number of different stakeholders* are conducting their own retrospectives of large-scale** battery operations in South Australia over the recent windless (and quite volatile) days. Here's some questions.
In an initial post-mortem of last night’s sustained period of high prices in SA, we take an initial look at how the region's utility-scale battery fleet responded, showing how aggregate stored energy was rapidly drawn down and how availability across the fleet tightened.
So far today we've seen a $21,019.65/MWh intra-day price spread in NSW, underscoring just how far prices can swing in the NEM.
Worth a short note today (Friday 27th June 2025) to note the publication of MN127877 – which references two market changes that will improve market transparency for all types of participants
In this guest post, Greg Williams calls for more research into how storage bidding—particularly auto-rebidding—is reshaping price formation and competition as flexible assets take centre stage in the NEM.
Paul Moore of Viotas look at recent supply-demand dynamics within the contingency FCAS markets and whether demand response can play a role.
Matt Grover from Fluence shares insights into the NEM's growing big battery fleet and what it means for the market and their operators. This article follows on from his keynote at the ESS two weeks ago.
Dan provides a brief write-up of his notes from attending the Australian Energy Storage Summit in Sydney last week.
Declan Kelly thinks through and discusses competition issues that could arise from the increasing proliferation of auto-bidding software by big batteries in the NEM - and suggests some pre-emptive steps that that could be taken to mitigate potential issues.
Philippe Orhan from Neoen shares this article which is adapted from his presentation about BESS bidding (and dealing with the complexity in the data) in the NEM at the recent All-Energy conference in Melbourne.
James Tetlow of Overwatch Energy shares this article which is adapted from his presentation about BESS operations in the NEM at the recent All-Energy conference in Melbourne.
Following on from earlier articles about price volatility on Tue 30th July 2024 (particularly in South Australia), guest author Allan O'Neil takes a closer look at the operation of battery units in South Australia.
Looking back 4 days (including Wed 8th May 2024) at NSW large-scale battery generator bidding.
2 x AEMO Market Notices this afternoon prompt this article about four upcoming Market Enhancements ... with the first to planned to commence from next Monday 7th August 2023
Someone asked me a question on social media this morning about batteries 'withdrawing capacity' ... here's a view of what's happened using ez2view (and as presented to EUAA).