I'm just having a quick look at our performance this evening,...

I'm just having a quick look at our performance this evening, marrying up AEMO pricing data with NEMLOG usage data. Keep in mind that I'm using the actual spot price and that I have not considered what the forecast prices were for these intervals, nor have I looked at the bid stacks or the FCAS markets, so it's impossible to guess exactly what the autobidder algorithm would have been thinking. But in conclusion, it only takes a few missed opportunities on both sides (charge/discharge) to leave us missing out on a lot of easy $$$ potential (unless we were making more money bidding that capacity into FCAS markets).

First the bad:
02:45 and 03:20 you can see in the graph below that these charges at $295.75 cost us a few $$$. The negative intervals do not go this deep, so it takes of lot of negative interval charging to try and get the daily charge cost back down.
17:35 $368.55 we charged in this interval, right after a ($96 interval and before 3x $190 intervals), an interesting decision.
18:20 $1048 we did not discharge into this interval (aside from the 0.647MW of noisy SCADA data that BBATTERY has (could this be FCAS operations?)), missed opportunity of >$4000
18:25 $720 we did not discharge into this interval
19:05 $3421 we did not discharge into this interval ???

The good:
18:35 $14927 we discharged at 50 MW earning (if my maths is good) $62,212.77 (remember this is only a 5 minute interval, so 1/12 of a MWh per MW of generation)
18:30 to 19:00 Average of $5104.56 at average discharge of 44.7 MW giving $133,613 of revenue for this ~half hour period

20:30 to 21:50 Managed to charge into average of $136 / MWh
22:20 to 22:50 (the latest interval in my dataset) Consistently discharging into ~$324 / MWh

Assuming my dataset and money assumptions are good, then net income for the day to the 22:50 interval is $150,360.78.
Total charge cost of $6866.63 with total discharge income of $157,227.41
Please keep in mind that we have a heat wave in QLD. Recent data suggests that pricing intervals over $400/MWh are not consistent so these income figures cannot simply be multiplied by 365 to get an annual performance indication. As shown above, 88% of our net income was from a 30-minute period of very high spot pricing that is on average approximately 14x higher than what I usually observe for this time of day.