In the National Electricity Market (NEM), power stations can bid in their availability in 10 different pricing tranches. They’re able to rebid this availability right up until dispatch is run.
Recently, I was exploring this bidding data and thought I’d take a peak at what the bidding behaviour of the Hornsdale (Tesla) battery looked like in the energy market.
I’d known for a while that the big batteries did a lot of rebidding, but I was blown away by just how frequent it was! In a single day (2019-01-01) the battery made almost 13,500 rebids! In fact, for the first interval of the day, the battery made almost 300 rebids in the week leading up to dispatch.
I do find it interesting how they appeared to be doing so many identical rebids – I suspect there must be some automated process going on that will rebid in all markets regardless of whether the rebid in a particular market is any different to the bid that it replaced.